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1. Analysis of Alfven Eigenmode destabilization in DIII-D high poloidal $\beta$ discharges using a Landau closure model

Author

Varela, J., Spong, D. A., Garcia, L., Huang, J., Murakami, M., Garofalo, A. M., Qian, J. P., Holcomb, C. T., Hyatt, A. W., Ferron, J. R., Collins, C. S., Ren, Q. L., McClenaghan, J., and Guo, W.

Subjects
Physics - Plasma Physics
Abstract

Alfven Eigenmodes are destabilized at the DIII-D pedestal during transient beta drops in high poloidal beta discharges with internal transport barriers (ITBs), driven by n=1 external kink modes, leading to energetic particle losses. There are two different scenarios in the thermal beta recovery phase: with bifurcation (two instability branches with different frequencies) or without bifurcation (single instability branch). We use the reduced MHD equations in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particles as well as the geodesic acoustic wave dynamics, to study the properties of the instabilities observed in the DIII-D high poloidal beta discharges and identify the conditions to trigger the bifurcation. The simulations suggest that instabilities with lower frequency in the bifurcation case are ballooning modes driven at the plasma pedestal, while the instability branch with higher frequencies are low n (n<4) Toroidal Alfven Eigenmodes nearby the pedestal. The reverse shear region between the middle and plasma periphery in the non-bifurcated case avoids the excitation of ballooning modes at the pedestal, although Toroidal Alfven Eigenmodes and Reverse Shear Alfven Eigenmodes are unstable in the reverse shear region. The n=1 and n=2 Alfven Eigenmode activity can be suppressed or minimized if the neutral beam injector (NBI) intensity is lower than the experimental value (betaf < 0.03). In addition, if the beam energy or neutral beam injector voltage is lower than in the experiment (Vth,f / VA0 < 0.2), the resonance between beam and thermal plasma is weaker. The n=3,4,5 and 6 AE activity can't be fully suppressed, although the growth rate and frequency is smaller for an optimized neutral beam injector operation regime. In conclusion, AE activity in high poloidal beta discharges can be minimized for optimized NBI operation regimes.

Published
2018
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2. Overview of NSTX Upgrade initial results and modelling highlights

Author

Menard, JE, Allain, JP, Battaglia, DJ, Bedoya, F, Bell, RE, Belova, E, Berkery, JW, Boyer, MD, Crocker, N, Diallo, A, Ebrahimi, F, Ferraro, N, Fredrickson, E, Frerichs, H, Gerhardt, S, Gorelenkov, N, Guttenfelder, W, Heidbrink, W, Kaita, R, Kaye, SM, Kriete, DM, Kubota, S, LeBlanc, BP, Liu, D, Lunsford, R, Mueller, D, Myers, CE, Ono, M, Park, J-K, Podesta, M, Raman, R, Reinke, M, Ren, Y, Sabbagh, SA, Schmitz, O, Scotti, F, Sechrest, Y, Skinner, CH, Smith, DR, Soukhanovskii, V, Stoltzfus-Dueck, T, Yuh, H, Wang, Z, Waters, I, Ahn, J-W, Andre, R, Barchfeld, R, Beiersdorfer, P, Bertelli, N, Bhattacharjee, A, Brennan, D, Buttery, R, Capece, A, Canal, G, Canik, J, Chang, CS, Darrow, D, Delgado-Aparicio, L, Domier, C, Ethier, S, Evans, T, Ferron, J, Finkenthal, M, Fonck, R, Gan, K, Gates, D, Goumiri, I, Gray, T, Hosea, J, Humphreys, D, Jarboe, T, Jardin, S, Jaworski, MA, Koel, B, Kolemen, E, Ku, S, La Haye, RJ, Levinton, F, Luhmann, N, Maingi, R, Maqueda, R, McKee, G, Meier, E, Myra, J, Perkins, R, Poli, F, Rhodes, T, Riquezes, J, Rowley, C, Russell, D, Schuster, E, Stratton, B, Stutman, D, Taylor, G, Tritz, K, Wang, W, Wirth, B, and Zweben, SJ

Subjects
NSTX-U, spherical tokamak, Alfven eigenmodes, plasma material interactions, boronization, error fields, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have been commissioned, the H-mode accessed, magnetic error fields identified and mitigated, and the first physics research campaign carried out. During ten run weeks of operation, NSTX-U surpassed NSTX record pulse-durations and toroidal fields (TF), and high-performance ∼1 MA H-mode plasmas comparable to the best of NSTX have been sustained near and slightly above the n = 1 no-wall stability limit and with H-mode confinement multiplier H98y,2 above 1. Transport and turbulence studies in L-mode plasmas have identified the coexistence of at least two ion-gyro-scale turbulent micro-instabilities near the same radial location but propagating in opposite (i.e. ion and electron diamagnetic) directions. These modes have the characteristics of ion-temperature gradient and micro-tearing modes, respectively, and the role of these modes in contributing to thermal transport is under active investigation. The new second more tangential neutral beam injection was observed to significantly modify the stability of two types of Alfven eigenmodes. Improvements in offline disruption forecasting were made in the areas of identification of rotating MHD modes and other macroscopic instabilities using the disruption event characterization and forecasting code. Lastly, the materials analysis and particle probe was utilized on NSTX-U for the first time and enabled assessments of the correlation between boronized wall conditions and plasma performance. These and other highlights from the first run campaign of NSTX-U are described.

Published
2017

4. An overview of recent physics results from NSTX

Author

Kaye, SM, Abrams, T, Ahn, J-W, Allain, JP, Andre, R, Andruczyk, D, Barchfeld, R, Battaglia, D, Bhattacharjee, A, Bedoya, F, Bell, RE, Belova, E, Berkery, J, Berry, L, Bertelli, N, Beiersdorfer, P, Bialek, J, Bilato, R, Boedo, J, Bonoli, P, Boozer, A, Bortolon, A, Boyer, MD, Boyle, D, Brennan, D, Breslau, J, Brooks, J, Buttery, R, Capece, A, Canik, J, Chang, CS, Crocker, N, Darrow, D, Davis, W, Delgado-Aparicio, L, Diallo, A, D'Ippolito, D, Domier, C, Ebrahimi, F, Ethier, S, Evans, T, Ferraro, N, Ferron, J, Finkenthal, M, Fonck, R, Fredrickson, E, Fu, GY, Gates, D, Gerhardt, S, Glasser, A, Gorelenkov, N, Gorelenkova, M, Goumiri, I, Gray, T, Green, D, Guttenfelder, W, Harvey, R, Hassanein, A, Heidbrink, W, Hirooka, Y, Hooper, EB, Hosea, J, Humphreys, D, Jaeger, EF, Jarboe, T, Jardin, S, Jaworski, MA, Kaita, R, Kessel, C, Kim, K, Koel, B, Kolemen, E, Kramer, G, Ku, S, Kubota, S, LaHaye, RJ, Lao, L, LeBlanc, BP, Levinton, F, Liu, D, Lore, J, Lucia, M, Luhmann, N, Maingi, R, Majeski, R, Mansfield, D, Maqueda, R, McKee, G, Medley, S, Meier, E, Menard, J, Mueller, D, Munsat, T, Muscatello, C, Myra, J, Nelson, B, Nichols, J, Ono, M, Osborne, T, and Park, J-K

Subjects
NSTX, spherical torus, overview, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

The National Spherical Torus Experiment (NSTX) is currently being upgraded to operate at twice the toroidal field and plasma current (up to 1T and 2MA), with a second, more tangentially aimed neutral beam (NB) for current and rotation control, allowing for pulse lengths up to 5s. Recent NSTX physics analyses have addressed topics that will allow NSTX-Upgrade to achieve the research goals critical to a Fusion Nuclear Science Facility. These include producing stable, 100% non-inductive operation in high-performance plasmas, assessing plasma-material interface (PMI) solutions to handle the high heat loads expected in the next-step devices and exploring the unique spherical torus (ST) parameter regimes to advance predictive capability. Non-inductive operation and current profile control in NSTX-U will be facilitated by co-axial helicity injection (CHI) as well as radio frequency (RF) and NB heating. CHI studies using NIMROD indicate that the reconnection process is consistent with the 2D Sweet-Parker theory. Full-wave AORSA simulations show that RF power losses in the scrape-off layer (SOL) increase significantly for both NSTX and NSTX-U when the launched waves propagate in the SOL. Toroidal Alfvén eigenmode avalanches and higher frequency Alfvén eigenmodes can affect NB-driven current through energy loss and redistribution of fast ions. The inclusion of rotation and kinetic resonances, which depend on collisionality, is necessary for predicting experimental stability thresholds of fast growing ideal wall and resistive wall modes. Neutral beams and neoclassical toroidal viscosity generated from applied 3D fields can be used as actuators to produce rotation profiles optimized for global stability. DEGAS-2 has been used to study the dependence of gas penetration on SOL temperatures and densities for the MGI system being implemented on the Upgrade for disruption mitigation. PMI studies have focused on the effect of ELMs and 3D fields on plasma detachment and heat flux handling. Simulations indicate that snowflake and impurity seeded radiative divertors are candidates for heat flux mitigation in NSTX-U. Studies of lithium evaporation on graphite surfaces indicate that lithium increases oxygen surface concentrations on graphite, and deuterium-oxygen affinity, which increases deuterium pumping and reduces recycling. In situ and test-stand experiments of lithiated graphite and molybdenum indicate temperature-enhanced sputtering, although that test-stand studies also show the potential for heat flux reduction through lithium vapour shielding. Non-linear gyro kinetic simulations have indicated that ion transport can be enhanced by a shear-flow instability, and that non-local effects are necessary to explain the observed rapid changes in plasma turbulence. Predictive simulations have shown agreement between a microtearing-based reduced transport model and the measured electron temperatures in a microtearing unstable regime. Two Alfvén eigenmode-driven fast ion transport models have been developed and successfully benchmarked against NSTX data. Upgrade construction is moving on schedule with initial physics research operation of NSTX-U planned for mid-2015.

Published
2015

8. The repeatability of cognitive performance : a meta-analysis

Author

Cauchoix, M., Chow, P. K. Y., van Horik, J. O., Atance, C. M., Barbeau, E. J., Barragan-Jason, G., Bize, P., Boussard, A., Buechel, S. D., Cabirol, A., Cauchard, L., Claidière, N., Dalesman, S., Devaud, J. M., Didic, M., Doligez, B., Fagot, J., Fichtel, C., Henke-von der Malsburg, J., Hermer, E., Huber, L., Huebner, F., Kappeler, P. M., Klein, S., Langbein, J., Langley, E. J. G., Lea, S. E. G., Lihoreau, M., Lovlie, H., Matzel, L. D., Nakagawa, S., Nawroth, C., Oesterwind, S., Sauce, B., Smith, E. A., Sorato, E., Tebbich, S., Wallis, L. J., Whiteside, M. A., Wilkinson, A., Chaine, A. S., and Morand-Ferron, J.

Published
2018

9. Non-stochastic behavior of atomic surface diffusion on Cu(111) at all temperatures

Author

Ferrón, J., Gómez, L., de Miguel, J. J., and Miranda, R.

Subjects
Condensed Matter - Other Condensed Matter
Abstract

Atomic diffusion is usually understood as a succession of random, independent displacements of an adatom over the surface's potential energy landscape. Nevertheless, an analysis of Molecular Dynamics simulations of self-diffusion on Cu(111) demonstrates the existence of different types of correlations in the atomic jumps at all temperatures. Thus, the atomic displacements cannot be correctly described in terms of a random walk model. This fact has a profound impact on the determination and interpretation of diffusion coefficients., Comment: 5 figures

Published
2004
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10. Overview of physics results from the conclusive operation of the National Spherical Torus Experiment

Author

Sabbagh, SA, Ahn, J-W, Allain, J, Andre, R, Balbaky, A, Bastasz, R, Battaglia, D, Bell, M, Bell, R, Beiersdorfer, P, Belova, E, Berkery, J, Betti, R, Bialek, J, Bigelow, T, Bitter, M, Boedo, J, Bonoli, P, Boozer, A, Bortolon, A, Boyle, D, Brennan, D, Breslau, J, Buttery, R, Canik, J, Caravelli, G, Chang, C, Crocker, N, Darrow, D, Davis, B, Delgado-Aparicio, L, Diallo, A, Ding, S, D'Ippolito, D, Domier, C, Dorland, W, Ethier, S, Evans, T, Ferron, J, Finkenthal, M, Foley, J, Fonck, R, Frazin, R, Fredrickson, E, Fu, G, Gates, D, Gerhardt, S, Glasser, A, Gorelenkov, N, Gray, T, Guo, Y, Guttenfelder, W, Hahm, T, Harvey, R, Hassanein, A, Heidbrink, W, Hill, K, Hirooka, Y, Hooper, EB, Hosea, J, Humphreys, D, Indireshkumar, K, Jaeger, F, Jarboe, T, Jardin, S, Jaworski, M, Kaita, R, Kallman, J, Katsuro-Hopkins, O, Kaye, S, Kessel, C, Kim, J, Kolemen, E, Kramer, G, Krasheninnikov, S, Kubota, S, Kugel, H, La Haye, RJ, Lao, L, LeBlanc, B, Lee, W, Lee, K, Leuer, J, Levinton, F, Liang, Y, Liu, D, Lore, J, Luhmann, N, Maingi, R, Majeski, R, Manickam, J, Mansfield, D, Maqueda, R, Mazzucato, E, McLean, A, McCune, D, McGeehan, B, McKee, G, Medley, S, and Meier, E

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

Research on the National Spherical Torus Experiment, NSTX, targets physics understanding needed for extrapolation to a steady-state ST Fusion Nuclear Science Facility, pilot plant, or DEMO. The unique ST operational space is leveraged to test physics theories for next-step tokamak operation, including ITER. Present research also examines implications for the coming device upgrade, NSTX-U. An energy confinement time, τE, scaling unified for varied wall conditions exhibits a strong improvement of BTτE with decreased electron collisionality, accentuated by lithium (Li) wall conditioning. This result is consistent with nonlinear microtearing simulations that match the experimental electron diffusivity quantitatively and predict reduced electron heat transport at lower collisionality. Beam-emission spectroscopy measurements in the steep gradient region of the pedestal indicate the poloidal correlation length of turbulence of about ten ion gyroradii increases at higher electron density gradient and lower Ti gradient, consistent with turbulence caused by trapped electron instabilities. Density fluctuations in the pedestal top region indicate ion-scale microturbulence compatible with ion temperature gradient and/or kinetic ballooning mode instabilities. Plasma characteristics change nearly continuously with increasing Li evaporation and edge localized modes (ELMs) stabilize due to edge density gradient alteration. Global mode stability studies show stabilizing resonant kinetic effects are enhanced at lower collisionality, but in stark contrast have almost no dependence on collisionality when the plasma is off-resonance. Combined resistive wall mode radial and poloidal field sensor feedback was used to control n = 1 perturbations and improve stability. The disruption probability due to unstable resistive wall modes (RWMs) was surprisingly reduced at very high βN/li > 10 consistent with low frequency magnetohydrodynamic spectroscopy measurements of mode stability. Greater instability seen at intermediate βN is consistent with decreased kinetic RWM stabilization. A model-based RWM state-space controller produced long-pulse discharges exceeding βN = 6.4 and βN/li = 13. Precursor analysis shows 96.3% of disruptions can be predicted with 10 ms warning and a false positive rate of only 2.8%. Disruption halo currents rotate toroidally and can have significant toroidal asymmetry. Global kinks cause measured fast ion redistribution, with full-orbit calculations showing redistribution from the core outward and towards V∥/V = 1 where destabilizing compressional Alfvén eigenmode resonances are expected. Applied 3D fields altered global Alfvén eigenmode characteristics. High-harmonic fast-wave (HHFW) power couples to field lines across the entire width of the scrape-off layer, showing the importance of the inclusion of this phenomenon in designing future RF systems. The snowflake divertor configuration enhanced by radiative detachment showed large reductions in both steady-state and ELM heat fluxes (ELMing peak values down from 19 MW m-2 to less than 1.5 MW m-2). Toroidal asymmetry of heat deposition was observed during ELMs or by 3D fields. The heating power required for accessing H-mode decreased by 30% as the triangularity was decreased by moving the X-point to larger radius, consistent with calculations of the dependence of E × B shear in the edge region on ion heat flux and X-point radius. Co-axial helicity injection reduced the inductive start-up flux, with plasmas ramped to 1 MA requiring 35% less inductive flux. Non-inductive current fraction (NICF) up to 65% is reached experimentally with neutral beam injection at plasma current Ip = 0.7 MA and between 70-100% with HHFW application at Ip = 0.3 MA. NSTX-U scenario development calculations project 100% NICF for a large range of 0.6 < Ip (MA) < 1.35. © 2013 IAEA, Vienna.

Published
2013

11. Overview of physics results from NSTX

Author

Raman, R, Ahn, J-W, Allain, JP, Andre, R, Bastasz, R, Battaglia, D, Beiersdorfer, P, Bell, M, Bell, R, Belova, E, Berkery, J, Betti, R, Bialek, J, Bigelow, T, Bitter, M, Boedo, J, Bonoli, P, Boozer, A, Bortolon, A, Brennan, D, Breslau, J, Buttery, R, Canik, J, Caravelli, G, Chang, C, Crocker, NA, Darrow, D, Davis, W, Delgado-Aparicio, L, Diallo, A, Ding, S, D'Ippolito, D, Domier, C, Dorland, W, Ethier, S, Evans, T, Ferron, J, Finkenthal, M, Foley, J, Fonck, R, Frazin, R, Fredrickson, E, Fu, G, Gates, D, Gerhardt, S, Glasser, A, Gorelenkov, N, Gray, T, Guo, Y, Guttenfelder, W, Hahm, T, Harvey, R, Hassanein, A, Heidbrink, W, Hill, K, Hirooka, Y, Hooper, EB, Hosea, J, Hu, B, Humphreys, D, Indireshkumar, K, Jaeger, F, Jarboe, T, Jardin, S, Jaworski, M, Kaita, R, Kallman, J, Katsuro-Hopkins, O, Kaye, S, Kessel, C, Kim, J, Kolemen, E, Krasheninnikov, S, Kubota, S, Kugel, H, La Haye, R, Lao, L, LeBlanc, B, Lee, W, Lee, K, Leuer, J, Levinton, F, Liang, Y, Liu, D, Luhmann, N, Maingi, R, Majeski, R, Manickam, J, Mansfield, D, Maqueda, R, Mazzucato, E, McLean, A, McCune, D, McGeehan, B, McKee, G, Medley, S, Menard, J, Menon, M, Meyer, H, and Mikkelsen, D

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

In the last two experimental campaigns, the low aspect ratio NSTX has explored physics issues critical to both toroidal confinement physics and ITER. Experiments have made extensive use of lithium coatings for wall conditioning, correction of non-axisymmetric field errors and control of n = 1 resistive wall modes (RWMs) to produce high-performance neutral-beam heated discharges extending to 1.7 s in duration with non-inductive current fractions up to 0.7. The RWM control coils have been used to trigger repetitive ELMs with high reliability, and they have also contributed to an improved understanding of both neoclassical tearing mode and RWM stabilization physics, including the interplay between rotation and kinetic effects on stability. High harmonic fast wave (HHFW) heating has produced plasmas with central electron temperatures exceeding 6 keV. The HHFW heating was used to show that there was a 20-40% higher power threshold for the L-H transition for helium than for deuterium plasmas. A new diagnostic showed a depletion of the fast-ion density profile over a broad spatial region as a result of toroidicity-induced Alfvén eigenmodes (TAEs) and energetic-particle modes (EPMs) bursts. In addition, it was observed that other modes (e.g. global Alfvén eigenmodes) can trigger TAE and EPM bursts, suggesting that fast ions are redistributed by high-frequency AEs. The momentum pinch velocity determined by a perturbative technique decreased as the collisionality was reduced, although the pinch to diffusion ratio, Vpinch/χ, remained approximately constant. The mechanisms of deuterium retention by graphite and lithium-coated graphite plasma-facing components have been investigated. To reduce divertor heat flux, a novel divertor configuration, the 'snowflake' divertor, was tested in NSTX and many beneficial aspects were found. A reduction in the required central solenoid flux has been realized in NSTX when discharges initiated by coaxial helicity injection were ramped in current using induction. The resulting plasmas have characteristics needed to meet the objectives of the non-inductive start-up and ramp-up program of NSTX. © 2011 IAEA, Vienna.

Published
2011

13. Overview of results from the National Spherical Torus Experiment (NSTX)

Author

Gates, DA, Ahn, J, Allain, J, Andre, R, Bastasz, R, Bell, M, Bell, R, Belova, E, Berkery, J, Betti, R, Bialek, J, Biewer, T, Bigelow, T, Bitter, M, Boedo, J, Bonoli, P, Boozer, A, Brennan, D, Breslau, J, Brower, D, Bush, C, Canik, J, Caravelli, G, Carter, M, Caughman, J, Chang, C, Choe, W, Crocker, N, Darrow, D, Delgado-Aparicio, L, Diem, S, D'Ippolito, D, Domier, C, Dorland, W, Efthimion, P, Ejiri, A, Ershov, N, Evans, T, Feibush, E, Fenstermacher, M, Ferron, J, Finkenthal, M, Foley, J, Frazin, R, Fredrickson, E, Fu, G, Funaba, H, Gerhardt, S, Glasser, A, Gorelenkov, N, Grisham, L, Hahm, T, Harvey, R, Hassanein, A, Heidbrink, W, Hill, K, Hillesheim, J, Hillis, D, Hirooka, Y, Hosea, J, Hu, B, Humphreys, D, Idehara, T, Indireshkumar, K, Ishida, A, Jaeger, F, Jarboe, T, Jardin, S, Jaworski, M, Ji, H, Jung, H, Kaita, R, Kallman, J, Katsuro-Hopkins, O, Kawahata, K, Kawamori, E, Kaye, S, Kessel, C, Kim, J, Kimura, H, Kolemen, E, Krasheninnikov, S, Krstic, P, Ku, S, Kubota, S, Kugel, H, La Haye, R, Lao, L, LeBlanc, B, Lee, W, Lee, K, Leuer, J, Levinton, F, Liang, Y, Liu, D, Luhmann, N, Maingi, R, Majeski, R, Manickam, J, and Mansfield, D

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

The mission of the National Spherical Torus Experiment (NSTX) is the demonstration of the physics basis required to extrapolate to the next steps for the spherical torus (ST), such as a plasma facing component test facility (NHTX) or an ST based component test facility (ST-CTF), and to support ITER. Key issues for the ST are transport, and steady state high β operation. To better understand electron transport, a new high-k scattering diagnostic was used extensively to investigate electron gyro-scale fluctuations with varying electron temperature gradient scale length. Results from n = 3 braking studies are consistent with the flow shear dependence of ion transport. New results from electron Bernstein wave emission measurements from plasmas with lithium wall coating applied indicate transmission efficiencies near 70% in H-mode as a result of reduced collisionality. Improved coupling of high harmonic fast-waves has been achieved by reducing the edge density relative to the critical density for surface wave coupling. In order to achieve high bootstrap current fraction, future ST designs envision running at very high elongation. Plasmas have been maintained on NSTX at very low internal inductance li ∼ 0.4 with strong shaping (κ ∼ 2.7, δ ∼ 0.8) with βN approaching the with-wall β-limit for several energy confinement times. By operating at lower collisionality in this regime, NSTX has achieved record non-inductive current drive fraction fNI ∼ 71%. Instabilities driven by super-Alfvénic ions will be an important issue for all burning plasmas, including ITER. Fast ions from NBI on NSTX are super-Alfvénic. Linear toroidal Alfvén eigenmode thresholds and appreciable fast ion loss during multi-mode bursts are measured and these results are compared with theory. The impact of n > 1 error fields on stability is an important result for ITER. Resistive wall mode/resonant field amplification feedback combined with n = 3 error field control was used on NSTX to maintain plasma rotation with β above the no-wall limit. Other highlights are results of lithium coating experiments, momentum confinement studies, scrape-off layer width scaling, demonstration of divertor heat load mitigation in strongly shaped plasmas and coupling of coaxial helicity injection plasmas to ohmic heating ramp-up. These results advance the ST towards next step fusion energy devices such as NHTX and ST-CTF. © 2009 IAEA, Vienna.

Published
2009

14. Overview of recent physics results from the National Spherical Torus Experiment (NSTX)

Author

Menard, JE, Bell, MG, Bell, RE, Bernabei, S, Bialek, J, Biewer, T, Blanchard, W, Boedo, J, Bush, CE, Carter, MD, Choe, W, Crocker, NA, Darrow, DS, Davis, W, Delgado-Aparicio, L, Diem, S, Domier, CW, D'Ippolito, DA, Ferron, J, Field, A, Foley, J, Fredrickson, ED, Gates, DA, Gibney, T, Harvey, R, Hatcher, RE, Heidbrink, W, Hill, KW, Hosea, JC, Jarboe, TR, Johnson, DW, Kaita, R, Kaye, SM, Kessel, CE, Kubota, S, Kugel, HW, Lawson, J, LeBlanc, BP, Lee, KC, Levinton, FM, Luhmann, NC, Maingi, R, Majeski, RP, Manickam, J, Mansfield, DK, Maqueda, R, Marsala, R, Mastrovito, D, Mau, TK, Mazzucato, E, Medley, SS, Meyer, H, Mikkelsen, DR, Mueller, D, Munsat, T, Myra, JR, Nelson, BA, Neumeyer, C, Nishino, N, Ono, M, Park, HK, Park, W, Paul, SF, Peebles, T, Peng, M, Phillips, C, Pigarov, A, Pinsker, R, Ram, A, Ramakrishnan, S, Raman, R, Rasmussen, D, Redi, M, Rensink, M, Rewoldt, G, Robinson, J, Roney, P, Roquemore, AL, Ruskov, E, Ryan, P, Sabbagh, SA, Schneider, H, Skinner, CH, Smith, DR, Sontag, A, Soukhanovskii, V, Stevenson, T, Stotler, D, Stratton, BC, Stutman, D, Swain, D, Synakowski, E, Takase, Y, Taylor, G, Tritz, K, von Halle, A, Wade, M, White, R, Wilgen, J, and Williams, M

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

The National Spherical Torus Experiment (NSTX) has made considerable progress in advancing the scientific understanding of high performance long-pulse plasmas needed for future spherical torus (ST) devices and ITER. Plasma durations up to 1.6 s (five current redistribution times) have been achieved at plasma currents of 0.7 MA with non-inductive current fractions above 65% while simultaneously achieving βT and βN values of 17% and 5.7 (%m T MA-1), respectively. A newly available motional Stark effect diagnostic has enabled validation of current-drive sources and improved the understanding of NSTX 'hybrid'-like scenarios. In MHD research, ex-vessel radial field coils have been utilized to infer and correct intrinsic EFs, provide rotation control and actively stabilize the n ≤ 1 resistive wall mode at ITER-relevant low plasma rotation values. In transport and turbulence research, the low aspect ratio and a wide range of achievable β in the NSTX provide unique data for confinement scaling studies, and a new microwave scattering diagnostic is being used to investigate turbulent density fluctuations with wavenumbers extending from ion to electron gyro-scales. In energetic particle research, cyclic neutron rate drops have been associated with the destabilization of multiple large toroidal Alfven eigenmodes (TAEs) analogous to the 'sea-of-TAE' modes predicted for ITER, and three-wave coupling processes have been observed for the first time. In boundary physics research, advanced shape control has enabled studies of the role of magnetic balance in H-mode access and edge localized mode stability. Peak divertor heat flux has been reduced by a factor of 5 using an H-mode-compatible radiative divertor, and lithium conditioning has demonstrated particle pumping and results in improved thermal confinement. Finally, non-solenoidal plasma start-up experiments have achieved plasma currents of 160 kA on closed magnetic flux surfaces utilizing coaxial helicity injection. © 2007 IAEA.

Published
2007

15. Effect of plasma shaping on performance in the National Spherical Torus Experimenta)

Author

Gates, DA, Maingi, R, Menard, J, Kaye, S, Sabbagh, SA, Taylor, G, Wilson, JR, Bell, MG, Bell, RE, Bernabei, S, Bialek, J, Biewer, T, Blanchard, W, Boedo, J, Bush, C, Carter, MD, Choe, W, Crocker, N, Darrow, DS, Davis, W, Delgado-Aparicio, L, Diem, S, Ferron, J, Field, A, Foley, J, Fredrickson, ED, Harvey, R, Hatcher, RE, Heidbrink, W, Hill, K, Hosea, JC, Jarboe, TR, Johnson, DW, Kaita, R, Kessel, C, Kubota, S, Kugel, HW, Lawson, J, LeBlanc, BP, Lee, KC, Levinton, F, Manickam, J, Maqueda, R, Marsala, R, Mastrovito, D, Mau, TK, Medley, SS, Meyer, H, Mikkelsen, DR, Mueller, D, Munsat, T, Nelson, BA, Neumeyer, C, Nishino, N, Ono, M, Park, H, Park, W, Paul, S, Peebles, W, Peng, M, Phillips, C, Pigarov, A, Pinsker, R, Ram, A, Ramakrishnan, S, Raman, R, Rasmussen, D, Redi, M, Rensink, M, Rewoldt, G, Robinson, J, Roney, P, Roquemore, L, Ruskov, E, Ryan, P, Schneider, H, Skinner, CH, Smith, DR, Sontag, A, Soukhanovskii, V, Stevenson, T, Stotler, D, Stratton, B, Stutman, D, Swain, D, Synakowski, E, Takase, Y, Tritz, K, Halle, A von, Wade, M, White, R, Wilgen, J, Williams, M, Zhu, W, Zweben, SJ, Akers, R, Beiersdorfer, P, Betti, R, and Bigelow, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Classical Physics, Fluids & Plasmas
Abstract

The National Spherical Torus Experiment (NSTX) has explored the effects of shaping on plasma performance as determined by many diverse topics including the stability of global magnetohydrodynamic (MHD) modes (e.g., ideal external kinks and resistive wall modes), edge localized modes (ELMs), bootstrap current drive, divertor flux expansion, and heat transport. Improved shaping capability has been crucial to achieving Βt ∼40%. Precise plasma shape control has been achieved on NSTX using real-time equilibrium reconstruction. NSTX has simultaneously achieved elongation κ∼2.8 and triangularity δ∼0.8. Ideal MHD theory predicts increased stability at high values of shaping factor S≡ q95 Ip (a Bt), which has been observed at large values of the S∼37 [MA (m·T)] on NSTX. The behavior of ELMs is observed to depend on plasma shape. A description of the ELM regimes attained as shape is varied will be presented. Increased shaping is predicted to increase the bootstrap fraction at fixed Ip. The achievement of strong shaping has enabled operation with 1 s pulses with Ip =1 MA, and for 1.6 s for Ip =700 kA. Analysis of the noninductive current fraction as well as empirical analysis of the achievable plasma pulse length as elongation is varied will be presented. Data are presented showing a reduction in peak divertor heat load due to increasing in flux expansion. © 2006 American Institute of Physics.

Published
2006

16. Progress towards steady state on NSTX

Author

Gates, DA, Kessel, C, Menard, J, Taylor, G, Wilson, JR, Bell, MG, Bell, RE, Bernabei, S, Bialek, J, Biewer, T, Blanchard, W, Boedo, J, Bush, C, Carter, MD, Choe, W, Crocker, N, Darrow, DS, Davis, W, Delgado-Aparicio, L, Diem, S, Ferron, J, Field, A, Foley, J, Fredrickson, ED, Gibney, T, Harvey, R, Hatcher, RE, Heidbrink, W, Hill, K, Hosea, JC, Jarboe, TR, Johnson, DW, Kaita, R, Kaye, S, Kubota, S, Kugel, HW, Lawson, J, LeBlanc, BP, Lee, KC, Levinton, F, Maingi, R, Manickam, J, Maqueda, R, Marsala, R, Mastrovito, D, Mau, TK, Medley, SS, Meyer, H, Mikkelsen, DR, Mueller, D, Munsat, T, Nelson, BA, Neumeyer, C, Nishino, N, Ono, M, Park, H, Park, W, Paul, S, Peebles, T, Peng, M, Phillips, C, Pigarov, A, Pinsker, R, Ram, A, Ramakrishnan, S, Raman, R, Rasmussen, D, Redi, M, Rensink, M, Rewoldt, G, Robinson, J, Roney, P, Roquemore, L, Ruskov, E, Ryan, P, Sabbagh, SA, Schneider, H, Skinner, CH, Smith, DR, Sontag, A, Soukhanovskii, V, Stevenson, T, Stotler, D, Stratton, B, Stutman, D, Swain, D, Synakowski, E, Takase, Y, Tritz, K, von Halle, A, Wade, M, White, R, Wilgen, J, Williams, M, Zhu, W, Zweben, SJ, Akers, R, Beiersdorfer, P, Betti, R, and Bigelow, T

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

In order to reduce recirculating power fraction to acceptable levels, the spherical torus concept relies on the simultaneous achievement of high toroidal β and high bootstrap fraction in steady state. In the last year, as a result of plasma control system improvements, the achievable plasma elongation on NSTX has been raised from κ ∼ 2.1 to κ ∼ 2.6 - approximately a 25% increase. This increase in elongation has led to a substantial increase in the toroidal β for long pulse discharges. The increase in β is associated with an increase in plasma current at nearly fixed poloidal β, which enables higher βt with nearly constant bootstrap fraction. As a result, for the first time in a spherical torus, a discharge with a plasma current of 1 MA has been sustained for 1 s (0.8 s current flat-top). Data are presented from NSTX correlating the increase in performance with increased plasma shaping capability. In addition to improved shaping, H-modes induced during the current ramp phase of the plasma discharge have been used to reduce flux consumption and to delay the onset of MHD instabilities. Based on these results, a modelled integrated scenario, which has 100% non-inductive current drive with very high toroidal β, will also be discussed. The NSTX poloidal field coils are currently being modified to produce the plasma shape which is required for this scenario, which requires high triangularity (δ ∼ 0.8) at elevated elongation (κ ∼ 2.5). The other main requirement of steady state on NSTX is the ability to drive a fraction of the total plasma current with RF waves. The results of high harmonic fast wave heating and current drive studies as well as electron Bernstein wave emission studies will be presented. © 2006 IAEA, Vienna.

Published
2006

26. DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy

Author

Fenstermacher, M.E., Abbate, J., Abe, S., Abrams, T., Adams, M., Adamson, B., Aiba, N., Akiyama, T., Aleynikov, P., Allen, E., Allen, S., Anand, H., Anderson, J., Andrew, Y., Andrews, T., Appelt, D., Arbon, R., Ashikawa, N., Ashourvan, A., Aslin, M., Asnis, Y., Austin, M., Ayala, D., Bak, J., Bandyopadhyay, I., Banerjee, S., Barada, K., Bardoczi, L., Barr, J., Bass, E., Battaglia, D., Battey, A., Baumgartner, W., Baylor, L., Beckers, J., Beidler, M., Belli, E., Berkery, J., Bernard, T., Bertelli, N., Beurskens, M., Bielajew, R., Bilgili, S., Biswas, B., Blondel, S., Boedo, J., Bogatu, I., Boivin, R., Bolzonella, T., Bongard, M., Bonnin, X., Bonoli, P., Bonotto, M., Bortolon, A., Bose, S., Bosviel, N., Bouwmans, S., Boyer, M., Boyes, W., Bradley, L., Brambila, R., Brennan, D., Bringuier, S., Brodsky, L., Brookman, M., Brooks, J., Brower, D., Brown, G., Brown, W., Burke, M., Burrell, K., Butler, K., Buttery, R., Bykov, I., Byrne, P., Cacheris, A., Callahan, K., Callen, J., Campbell, G., Candy, J., Canik, J., Cano-Megias, P., Cao, N., Carayannopoulos, L., Carlstrom, T., Carrig, W., Carter, T., Cary, W., Casali, L., Cengher, M., Cespedes Paz, G., Chaban, R., Chan, V., Chapman, B., Char, I., Chattopadhyay, A., Chen, R., Chen, J., Chen, X., Chen, M., Chen, Z., Choi, M., Choi, W., Choi, G., Chousal, L., Chrobak, C., Chrystal, C., Chung, Y., Churchill, R., Cianciosa, M., Clark, J., Clement, M., Coda, S., Cole, A., Collins, C., Conlin, W., Cooper, A., Cordell, J., Coriton, B., Cote, T., Cothran, J., Creely, A., Crocker, N., Crowe, C., Crowley, B., Crowley, T., Cruz-Zabala, D., Cummings, D., Curie, M., Curreli, D., Dal Molin, A., Dannels, B., Dautt-Silva, A., Davda, K., De Tommasi, G., de Vries, P., Degrandchamp, G., Degrassie, J., Demers, D., Denk, S., Depasquale, S., Deshazer, E., Diallo, A., Diem, S., Dimits, A., Ding, R., Ding, S., Ding, W., Do, T., Doane, J., Dong, G., Donovan, D., Drake, J., Drews, W., Drobny, J., Du, X., Du, H., Duarte, V., Dudt, D., Dunn, C., Duran, J., Dvorak, A., Effenberg, F., Eidietis, N., Elder, D., Eldon, D., Ellis, R., Elwasif, W., Ennis, D., Erickson, K., Ernst, D., Fasciana, M., Fedorov, D., Feibush, E., Ferraro, N., Ferreira, J., Ferron, J., Fimognari, P., Finkenthal, D., Fitzpatrick, R., Fox, P., Fox, W., Frassinetti, L., Frerichs, H., Frye, H., Fu, Y., Gage, K., Galdon Quiroga, J., Gallo, A., Gao, Q., Garcia, A., Garcia Munoz, M., Garnier, D., Garofalo, A., Gattuso, A., Geng, D., Gentle, K., Ghosh, D., Giacomelli, L., Gibson, S., Gilson, E., Giroud, C., Glass, F., Glasser, A., Glibert, D., Gohil, P., Gomez, R., Gomez, S., Gong, X., Gonzales, E., Goodman, A., Gorelov, Y., Graber, V., Granetz, R., Gray, T., Green, D., Greenfield, C., Greenwald, M., Grierson, B., Groebner, R., Grosnickle, W., Groth, M., Grunloh, H., Gu, S., Guo, W., Guo, H., Gupta, P., Guterl, J., Guttenfelder, W., Guzman, T., Haar, S., Hager, R., Hahn, S., Halfmoon, M., Hall, T., Hallatschek, K., Halpern, F., Hammett, G., Han, H., Hansen, E., Hansen, C., Hansink, M., Hanson, J., Hanson, M., Hao, G., Harris, A., Harvey, R., Haskey, S., Hassan, E., Hassanein, A., Hatch, D., Hawryluk, R., Hayashi, W., Heidbrink, W., Herfindal, J., Hicok, J., Hill, D., Hinson, E., Holcomb, C., Holland, L., Holland, C., Hollmann, E., Hollocombe, J., Holm, A., Holmes, I., Holtrop, K., Honda, M., Hong, R., Hood, R., Horton, A., Horvath, L., Hosokawa, M., Houshmandyar, S., Howard, N., Howell, E., Hoyt, D., Hu, W., Hu, Y., Hu, Q., Huang, J., Huang, Y., Hughes, J., Human, T., Humphreys, D., Huynh, P., Hyatt, A., Ibanez, C., Ibarra, L., Icasas, R., Ida, K., Igochine, V., In, Y., Inoue, S., Isayama, A., Izacard, O., Izzo, V., Jackson, A., Jacobsen, G., Jaervinen, A., Jalalvand, A., Janhunen, J., Jardin, S., Jarleblad, H., Jeon, Y., Ji, H., Jian, X., Joffrin, E., Johansen, A., Johnson, C., Johnson, T., Jones, C., Joseph, I., Jubas, D., Junge, B., Kalb, W., Kalling, R., Kamath, C., Kang, J., Kaplan, D., Kaptanoglu, A., Kasdorf, S., Kates-Harbeck, J., Kazantzidis, P., Kellman, A., Kellman, D., Kessel, C., Khumthong, K., Kim, E., Kim, H., Kim, J., Kim, S., Kim, K., Kim, C., Kimura, W., King, M., King, J., Kinsey, J., Kirk, A., Kiyan, B., Kleiner, A., Klevarova, V., Knapp, R., Knolker, M., Ko, W., Kobayashi, T., Koch, E., Kochan, M., Koel, B., Koepke, M., Kohn, A., Kolasinski, R., Kolemen, E., Kostadinova, E., Kostuk, M., Kramer, G., Kriete, D., Kripner, L., Kubota, S., Kulchar, J., Kwon, K., La Haye, R., Laggner, F., Lan, H., Lantsov, R., Lao, L., Lasa Esquisabel, A., Lasnier, C., Lau, C., Leard, B., Lee, J., Lee, R., Lee, M., Lee, Y., Lee, C., Lee, S., Lehnen, M., Leonard, A., Leppink, E., Lesher, M., Lestz, J., Leuer, J., Leuthold, N., Li, X., Li, K., Li, E., Li, G., Li, L., Li, Z., Li, J., Li, Y., Lin, Z., Lin, D., Liu, X., Liu, J., Liu, Y., Liu, T., Liu, C., Liu, Z., Liu, D., Liu, A., Loarte-Prieto, A., Lodestro, L., Logan, N., Lohr, J., Lombardo, B., Lore, J., Luan, Q., Luce, T., Luda Di Cortemiglia, T., Luhmann, N., Lunsford, R., Luo, Z., Lvovskiy, A., Lyons, B., Ma, X., Madruga, M., Madsen, B., Maggi, C., Maheshwari, K., Mail, A., Mailloux, J., Maingi, R., Major, M., Makowski, M., Manchanda, R., Marini, C., Marinoni, A., Maris, A., Markovic, T., Marrelli, L., Martin, E., Mateja, J., Matsunaga, G., Maurizio, R., Mauzey, P., Mauzey, D., McArdle, G., McClenaghan, J., McCollam, K., McDevitt, C., McKay, K., McKee, G., McLean, A., Mehta, V., Meier, E., Menard, J., Meneghini, O., Merlo, G., Messer, S., Meyer, W., Michael, C., Michoski, C., Milne, P., Minet, G., Misleh, A., Mitrishkin, Y., Moeller, C., Montes, K., Morales, M., Mordijck, S., Moreau, D., Morosohk, S., Morris, P., Morton, L., Moser, A., Moyer, R., Moynihan, C., Mrazkova, T., Mueller, D., Munaretto, S., Munoz Burgos, J., Murphy, C., Murphy, K., Muscatello, C., Myers, C., Nagy, A., Nandipati, G., Navarro, M., Nave, F., Navratil, G., Nazikian, R., Neff, A., Neilson, G., Neiser, T., Neiswanger, W., Nelson, D., Nelson, A., Nespoli, F., Nguyen, R., Nguyen, L., Nguyen, X., Nichols, J., Nocente, M., Nogami, S., Noraky, S., Norausky, N., Nornberg, M., Nygren, R., Odstrcil, T., Ogas, D., Ogorman, T., Ohdachi, S., Ohtani, Y., Okabayashi, M., Okamoto, M., Olavson, L., Olofsson, E., Omullane, M., Oneill, R., Orlov, D., Orvis, W., Osborne, T., Pace, D., Paganini Canal, G., Pajares Martinez, A., Palacios, L., Pan, C., Pan, Q., Pandit, R., Pandya, M., Pankin, A., Park, Y., Park, J., Parker, S., Parks, P., Parsons, M., Patel, B., Pawley, C., Paz-Soldan, C., Peebles, W., Pelton, S., Perillo, R., Petty, C., Peysson, Y., Pierce, D., Pigarov, A., Pigatto, L., Piglowski, D., Pinches, S., Pinsker, R., Piovesan, P., Piper, N., Pironti, A., Pitts, R., Pizzo, J., Plank, U., Podesta, M., Poli, E., Poli, F., Ponce, D., Popovic, Z., Porkolab, M., Porter, G., Powers, C., Powers, S., Prater, R., Pratt, Q., Pusztai, I., Qian, J., Qin, X., Ra, O., Rafiq, T., Raines, T., Raman, R., Rauch, J., Raymond, A., Rea, C., Reich, M., Reiman, A., Reinhold, S., Reinke, M., Reksoatmodjo, R., Ren, Q., Ren, Y., Ren, J., Rensink, M., Renteria, J., Rhodes, T., Rice, J., Roberts, R., Robinson, J., Rodriguez Fernandez, P., Rognlien, T., Rosenthal, A., Rosiello, S., Rost, J., Roveto, J., Rowan, W., Rozenblat, R., Ruane, J., Rudakov, D., Ruiz Ruiz, J., Rupani, R., Saarelma, S., Sabbagh, S., Sachdev, J., Saenz, J., Saib, S., Salewski, M., Salmi, A., Sammuli, B., Samuell, C., Sandorfi, A., Sang, C., Sarff, J., Sauter, O., Schaubel, K., Schmitz, L., Schmitz, O., Schneider, J., Schroeder, P., Schultz, K., Schuster, E., Schwartz, J., Sciortino, F., Scotti, F., Scoville, J., Seltzman, A., Seol, S., Sfiligoi, I., Shafer, M., Sharapov, S., Shen, H., Sheng, Z., Shepard, T., Shi, S., Shibata, Y., Shin, G., Shiraki, D., Shousha, R., Si, H., Simmerling, P., Sinclair, G., Sinha, J., Sinha, P., Sips, G., Sizyuk, T., Skinner, C., Sladkomedova, A., Slendebroek, T., Slief, J., Smirnov, R., Smith, J., Smith, S., Smith, D., Snipes, J., Snoep, G., Snyder, A., Snyder, P., Solano, E., Solomon, W., Song, J., Sontag, A., Soukhanovskii, V., Spendlove, J., Spong, D., Squire, J., Srinivasan, C., Stacey, W., Staebler, G., Stagner, L., Stange, T., Stangeby, P., Stefan, R., Stemprok, R., Stephan, D., Stillerman, J., Stoltzfus-Dueck, T., Stonecipher, W., Storment, S., Strait, E., Su, D., Sugiyama, L., Sun, Y., Sun, P., Sun, Z., Sun, A., Sundstrom, D., Sung, C., Sungcoco, J., Suttrop, W., Suzuki, Y., Suzuki, T., Svyatkovskiy, A., Swee, C., Sweeney, R., Sweetnam, C., Szepesi, G., Takechi, M., Tala, T., Tanaka, K., Tang, X., Tang, S., Tao, Y., Tao, R., Taussig, D., Taylor, T., Teixeira, K., Teo, K., Theodorsen, A., Thomas, D., Thome, K., Thorman, A., Thornton, A., Ti, A., Tillack, M., Timchenko, N., Tinguely, R., Tompkins, R., Tooker, J., Torrezan De Sousa, A., Trevisan, G., Tripathi, S., Trujillo Ochoa, A., Truong, D., Tsui, C., Turco, F., Turnbull, A., Umansky, M., Unterberg, E., Vaezi, P., Vail, P., Valdez, J., Valkis, W., Van Compernolle, B., Van Galen, J., van Kampen, R., Van Zeeland, M., Verdoolaege, G., Vianello, N., Victor, B., Viezzer, E., Vincena, S., Wade, M., Waelbroeck, F., Wai, J., Wakatsuki, T., Walker, M., Wallace, G., Waltz, R., Wampler, W., Wang, L., Wang, H., Wang, Y., Wang, Z., Wang, G., Ward, S., Watkins, M., Watkins, J., Wehner, W., Wei, Y., Weiland, M., Weisberg, D., Welander, A., White, A., White, R., Wiesen, S., Wilcox, R., Wilks, T., Willensdorfer, M., Wilson, H., Wingen, A., Wolde, M., Wolff, M., Woller, K., Wolz, A., Wong, H., Woodruff, S., Wu, M., Wu, Y., Wukitch, S., Wurden, G., Xiao, W., Xie, R., Xing, Z., Xu, X., Xu, C., Xu, G., Yan, Z., Yang, X., Yang, S., Yokoyama, T., Yoneda, R., Yoshida, M., You, K., Younkin, T., Yu, J., Yu, M., Yu, G., Yuan, Q., Zaidenberg, L., Zakharov, L., Zamengo, A., Zamperini, S., Zarnstorff, M., Zeger, E., Zeller, K., Zeng, L., Zerbini, M., Zhang, L., Zhang, X., Zhang, R., Zhang, B., Zhang, J., Zhao, L., Zhao, B., Zheng, Y., Zheng, L., Zhu, B., Zhu, J., Zhu, Y., Zsutty, M., Zuin, M., Fenstermacher, M.E., Abbate, J., Abe, S., Abrams, T., Adams, M., Adamson, B., Aiba, N., Akiyama, T., Aleynikov, P., Allen, E., Allen, S., Anand, H., Anderson, J., Andrew, Y., Andrews, T., Appelt, D., Arbon, R., Ashikawa, N., Ashourvan, A., Aslin, M., Asnis, Y., Austin, M., Ayala, D., Bak, J., Bandyopadhyay, I., Banerjee, S., Barada, K., Bardoczi, L., Barr, J., Bass, E., Battaglia, D., Battey, A., Baumgartner, W., Baylor, L., Beckers, J., Beidler, M., Belli, E., Berkery, J., Bernard, T., Bertelli, N., Beurskens, M., Bielajew, R., Bilgili, S., Biswas, B., Blondel, S., Boedo, J., Bogatu, I., Boivin, R., Bolzonella, T., Bongard, M., Bonnin, X., Bonoli, P., Bonotto, M., Bortolon, A., Bose, S., Bosviel, N., Bouwmans, S., Boyer, M., Boyes, W., Bradley, L., Brambila, R., Brennan, D., Bringuier, S., Brodsky, L., Brookman, M., Brooks, J., Brower, D., Brown, G., Brown, W., Burke, M., Burrell, K., Butler, K., Buttery, R., Bykov, I., Byrne, P., Cacheris, A., Callahan, K., Callen, J., Campbell, G., Candy, J., Canik, J., Cano-Megias, P., Cao, N., Carayannopoulos, L., Carlstrom, T., Carrig, W., Carter, T., Cary, W., Casali, L., Cengher, M., Cespedes Paz, G., Chaban, R., Chan, V., Chapman, B., Char, I., Chattopadhyay, A., Chen, R., Chen, J., Chen, X., Chen, M., Chen, Z., Choi, M., Choi, W., Choi, G., Chousal, L., Chrobak, C., Chrystal, C., Chung, Y., Churchill, R., Cianciosa, M., Clark, J., Clement, M., Coda, S., Cole, A., Collins, C., Conlin, W., Cooper, A., Cordell, J., Coriton, B., Cote, T., Cothran, J., Creely, A., Crocker, N., Crowe, C., Crowley, B., Crowley, T., Cruz-Zabala, D., Cummings, D., Curie, M., Curreli, D., Dal Molin, A., Dannels, B., Dautt-Silva, A., Davda, K., De Tommasi, G., de Vries, P., Degrandchamp, G., Degrassie, J., Demers, D., Denk, S., Depasquale, S., Deshazer, E., Diallo, A., Diem, S., Dimits, A., Ding, R., Ding, S., Ding, W., Do, T., Doane, J., Dong, G., Donovan, D., Drake, J., Drews, W., Drobny, J., Du, X., Du, H., Duarte, V., Dudt, D., Dunn, C., Duran, J., Dvorak, A., Effenberg, F., Eidietis, N., Elder, D., Eldon, D., Ellis, R., Elwasif, W., Ennis, D., Erickson, K., Ernst, D., Fasciana, M., Fedorov, D., Feibush, E., Ferraro, N., Ferreira, J., Ferron, J., Fimognari, P., Finkenthal, D., Fitzpatrick, R., Fox, P., Fox, W., Frassinetti, L., Frerichs, H., Frye, H., Fu, Y., Gage, K., Galdon Quiroga, J., Gallo, A., Gao, Q., Garcia, A., Garcia Munoz, M., Garnier, D., Garofalo, A., Gattuso, A., Geng, D., Gentle, K., Ghosh, D., Giacomelli, L., Gibson, S., Gilson, E., Giroud, C., Glass, F., Glasser, A., Glibert, D., Gohil, P., Gomez, R., Gomez, S., Gong, X., Gonzales, E., Goodman, A., Gorelov, Y., Graber, V., Granetz, R., Gray, T., Green, D., Greenfield, C., Greenwald, M., Grierson, B., Groebner, R., Grosnickle, W., Groth, M., Grunloh, H., Gu, S., Guo, W., Guo, H., Gupta, P., Guterl, J., Guttenfelder, W., Guzman, T., Haar, S., Hager, R., Hahn, S., Halfmoon, M., Hall, T., Hallatschek, K., Halpern, F., Hammett, G., Han, H., Hansen, E., Hansen, C., Hansink, M., Hanson, J., Hanson, M., Hao, G., Harris, A., Harvey, R., Haskey, S., Hassan, E., Hassanein, A., Hatch, D., Hawryluk, R., Hayashi, W., Heidbrink, W., Herfindal, J., Hicok, J., Hill, D., Hinson, E., Holcomb, C., Holland, L., Holland, C., Hollmann, E., Hollocombe, J., Holm, A., Holmes, I., Holtrop, K., Honda, M., Hong, R., Hood, R., Horton, A., Horvath, L., Hosokawa, M., Houshmandyar, S., Howard, N., Howell, E., Hoyt, D., Hu, W., Hu, Y., Hu, Q., Huang, J., Huang, Y., Hughes, J., Human, T., Humphreys, D., Huynh, P., Hyatt, A., Ibanez, C., Ibarra, L., Icasas, R., Ida, K., Igochine, V., In, Y., Inoue, S., Isayama, A., Izacard, O., Izzo, V., Jackson, A., Jacobsen, G., Jaervinen, A., Jalalvand, A., Janhunen, J., Jardin, S., Jarleblad, H., Jeon, Y., Ji, H., Jian, X., Joffrin, E., Johansen, A., Johnson, C., Johnson, T., Jones, C., Joseph, I., Jubas, D., Junge, B., Kalb, W., Kalling, R., Kamath, C., Kang, J., Kaplan, D., Kaptanoglu, A., Kasdorf, S., Kates-Harbeck, J., Kazantzidis, P., Kellman, 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Abstract

DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I p steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at ∼8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I p beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stability limit

Published
2022

27. DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy

Author

Fenstermacher, M, Abbate, J, Abe, S, Abrams, T, Adams, M, Adamson, B, Aiba, N, Akiyama, T, Aleynikov, P, Allen, E, Allen, S, Anand, H, Anderson, J, Andrew, Y, Andrews, T, Appelt, D, Arbon, R, Ashikawa, N, Ashourvan, A, Aslin, M, Asnis, Y, Austin, M, Ayala, D, Bak, J, Bandyopadhyay, I, Banerjee, S, Barada, K, Bardoczi, L, Barr, J, Bass, E, Battaglia, D, Battey, A, Baumgartner, W, Baylor, L, Beckers, J, Beidler, M, Belli, E, Berkery, J, Bernard, T, Bertelli, N, Beurskens, M, Bielajew, R, Bilgili, S, Biswas, B, Blondel, S, Boedo, J, Bogatu, I, Boivin, R, Bolzonella, T, Bongard, M, Bonnin, X, Bonoli, P, Bonotto, M, Bortolon, A, Bose, S, Bosviel, N, Bouwmans, S, Boyer, M, Boyes, W, Bradley, L, Brambila, R, Brennan, D, Bringuier, S, Brodsky, L, Brookman, M, Brooks, J, Brower, D, Brown, G, Brown, W, Burke, M, Burrell, K, Butler, K, Buttery, R, Bykov, I, Byrne, P, Cacheris, A, Callahan, K, Callen, J, Campbell, G, Candy, J, Canik, J, Cano-Megias, P, Cao, N, Carayannopoulos, L, Carlstrom, T, Carrig, W, Carter, T, Cary, W, Casali, L, Cengher, M, Paz, G, Chaban, R, Chan, V, Chapman, B, Char, I, Chattopadhyay, A, Chen, R, Chen, J, Chen, X, Chen, M, Chen, Z, Choi, M, Choi, W, Choi, G, Chousal, L, Chrobak, C, Chrystal, C, Chung, Y, Churchill, R, Cianciosa, M, Clark, J, Clement, M, Coda, S, Cole, A, Collins, C, Conlin, W, Cooper, A, Cordell, J, Coriton, B, Cote, T, Cothran, J, Creely, A, Crocker, N, Crowe, C, Crowley, B, Crowley, T, Cruz-Zabala, D, Cummings, D, Curie, M, Curreli, D, Dal Molin, A, Dannels, B, Dautt-Silva, A, Davda, K, De Tommasi, G, De Vries, P, Degrandchamp, G, Degrassie, J, Demers, D, Denk, S, Depasquale, S, Deshazer, E, Diallo, A, Diem, S, Dimits, A, Ding, R, Ding, S, Ding, W, Do, T, Doane, J, Dong, G, Donovan, D, Drake, J, Drews, W, Drobny, J, Du, X, Du, H, Duarte, V, Dudt, D, Dunn, C, Duran, J, Dvorak, A, Effenberg, F, Eidietis, N, Elder, D, Eldon, D, Ellis, R, Elwasif, W, Ennis, D, Erickson, K, Ernst, D, Fasciana, M, Fedorov, D, Feibush, E, Ferraro, N, Ferreira, J, Ferron, J, Fimognari, P, Finkenthal, D, Fitzpatrick, R, Fox, P, Fox, W, Frassinetti, L, Frerichs, H, Frye, H, Fu, Y, Gage, K, Quiroga, J, Gallo, A, Gao, Q, Garcia, A, Munoz, M, Garnier, D, Garofalo, A, Gattuso, A, Geng, D, Gentle, K, Ghosh, D, Giacomelli, L, Gibson, S, Gilson, E, Giroud, C, Glass, F, Glasser, A, Glibert, D, Gohil, P, Gomez, R, Gomez, S, Gong, X, Gonzales, E, Goodman, A, Gorelov, Y, Graber, V, Granetz, R, Gray, T, Green, D, Greenfield, C, Greenwald, M, Grierson, B, Groebner, R, Grosnickle, W, Groth, M, Grunloh, H, Gu, S, Guo, W, Guo, H, Gupta, P, Guterl, J, Guttenfelder, W, Guzman, T, Haar, S, Hager, R, Hahn, S, Halfmoon, M, Hall, T, Hallatschek, K, Halpern, F, Hammett, G, Han, H, Hansen, E, Hansen, C, Hansink, M, Hanson, J, Hanson, M, Hao, G, Harris, A, Harvey, R, Haskey, S, Hassan, E, Hassanein, A, Hatch, D, Hawryluk, R, Hayashi, W, Heidbrink, W, Herfindal, J, Hicok, J, Hill, D, Hinson, E, Holcomb, C, Holland, L, Holland, C, Hollmann, E, Hollocombe, J, 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Shibata, Y, Shin, G, Shiraki, D, Shousha, R, Si, H, Simmerling, P, Sinclair, G, Sinha, J, Sinha, P, Sips, G, Sizyuk, T, Skinner, C, Sladkomedova, A, Slendebroek, T, Slief, J, Smirnov, R, Smith, J, Smith, S, Smith, D, Snipes, J, Snoep, G, Snyder, A, Snyder, P, Solano, E, Solomon, W, Song, J, Sontag, A, Soukhanovskii, V, Spendlove, J, Spong, D, Squire, J, Srinivasan, C, Stacey, W, Staebler, G, Stagner, L, Stange, T, Stangeby, P, Stefan, R, Stemprok, R, Stephan, D, Stillerman, J, Stoltzfus-Dueck, T, Stonecipher, W, Storment, S, Strait, E, Su, D, Sugiyama, L, Sun, Y, Sun, P, Sun, Z, Sun, A, Sundstrom, D, Sung, C, Sungcoco, J, Suttrop, W, Suzuki, Y, Suzuki, T, Svyatkovskiy, A, Swee, C, Sweeney, R, Sweetnam, C, Szepesi, G, Takechi, M, Tala, T, Tanaka, K, Tang, X, Tang, S, Tao, Y, Tao, R, Taussig, D, Taylor, T, Teixeira, K, Teo, K, Theodorsen, A, Thomas, D, Thome, K, Thorman, A, Thornton, A, Ti, A, Tillack, M, Timchenko, N, Tinguely, R, Tompkins, R, Tooker, J, De Sousa, A, Trevisan, G, 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Zhao, L, Zhao, B, Zheng, Y, Zheng, L, Zhu, B, Zhu, J, Zhu, Y, Zsutty, M, Zuin, M, Fenstermacher, ME, Paz, GC, Quiroga, JG, Munoz, MG, Esquisabel, AL, Di Cortemiglia, TL, Burgos, JM, Canal, GP, Martinez, AP, Fernandez, PR, Ruiz, JR, De Sousa, AT, Ochoa, AT, Fenstermacher, M, Abbate, J, Abe, S, Abrams, T, Adams, M, Adamson, B, Aiba, N, Akiyama, T, Aleynikov, P, Allen, E, Allen, S, Anand, H, Anderson, J, Andrew, Y, Andrews, T, Appelt, D, Arbon, R, Ashikawa, N, Ashourvan, A, Aslin, M, Asnis, Y, Austin, M, Ayala, D, Bak, J, Bandyopadhyay, I, Banerjee, S, Barada, K, Bardoczi, L, Barr, J, Bass, E, Battaglia, D, Battey, A, Baumgartner, W, Baylor, L, Beckers, J, Beidler, M, Belli, E, Berkery, J, Bernard, T, Bertelli, N, Beurskens, M, Bielajew, R, Bilgili, S, Biswas, B, Blondel, S, Boedo, J, Bogatu, I, Boivin, R, Bolzonella, T, Bongard, M, Bonnin, X, Bonoli, P, Bonotto, M, Bortolon, A, Bose, S, Bosviel, N, Bouwmans, S, Boyer, M, Boyes, W, Bradley, L, Brambila, R, Brennan, D, Bringuier, S, Brodsky, L, Brookman, M, Brooks, J, Brower, D, Brown, G, Brown, W, Burke, M, Burrell, K, Butler, K, Buttery, R, Bykov, I, Byrne, P, Cacheris, A, Callahan, K, Callen, J, Campbell, G, Candy, J, Canik, J, Cano-Megias, P, Cao, N, Carayannopoulos, L, Carlstrom, T, Carrig, W, Carter, T, Cary, W, Casali, L, Cengher, M, Paz, G, Chaban, R, Chan, V, Chapman, B, Char, I, Chattopadhyay, A, Chen, R, Chen, J, Chen, X, Chen, M, Chen, Z, Choi, M, Choi, W, Choi, G, Chousal, L, Chrobak, C, Chrystal, C, Chung, Y, Churchill, R, Cianciosa, M, Clark, J, Clement, M, Coda, S, Cole, A, Collins, C, Conlin, W, Cooper, A, Cordell, J, Coriton, B, Cote, T, Cothran, J, Creely, A, Crocker, N, Crowe, C, Crowley, B, Crowley, T, Cruz-Zabala, D, Cummings, D, Curie, M, Curreli, D, Dal Molin, A, Dannels, B, Dautt-Silva, A, Davda, K, De Tommasi, G, De Vries, P, Degrandchamp, G, Degrassie, J, Demers, D, Denk, S, Depasquale, S, Deshazer, E, Diallo, A, Diem, S, Dimits, A, Ding, R, Ding, S, Ding, W, Do, T, Doane, J, Dong, G, Donovan, D, Drake, J, Drews, W, Drobny, J, Du, X, Du, H, Duarte, V, Dudt, D, Dunn, C, Duran, J, Dvorak, A, Effenberg, F, Eidietis, N, Elder, D, Eldon, D, Ellis, R, Elwasif, W, Ennis, D, Erickson, K, Ernst, D, Fasciana, M, Fedorov, D, Feibush, E, Ferraro, N, Ferreira, J, Ferron, J, Fimognari, P, Finkenthal, D, Fitzpatrick, R, Fox, P, Fox, W, Frassinetti, L, Frerichs, H, Frye, H, Fu, Y, Gage, K, Quiroga, J, Gallo, A, Gao, Q, Garcia, A, Munoz, M, Garnier, D, Garofalo, A, Gattuso, A, Geng, D, Gentle, K, Ghosh, D, Giacomelli, L, Gibson, S, Gilson, E, Giroud, C, Glass, F, Glasser, A, Glibert, D, Gohil, P, Gomez, R, Gomez, S, Gong, X, Gonzales, E, Goodman, A, Gorelov, Y, Graber, V, Granetz, R, Gray, T, Green, D, Greenfield, C, Greenwald, M, Grierson, B, Groebner, R, Grosnickle, W, Groth, M, Grunloh, H, Gu, S, Guo, W, Guo, H, Gupta, P, Guterl, J, Guttenfelder, W, Guzman, T, Haar, S, Hager, R, Hahn, S, Halfmoon, M, Hall, T, Hallatschek, K, Halpern, F, Hammett, G, Han, H, Hansen, E, Hansen, C, Hansink, M, Hanson, J, Hanson, M, Hao, G, Harris, A, Harvey, R, Haskey, S, Hassan, E, Hassanein, A, Hatch, D, Hawryluk, R, Hayashi, W, Heidbrink, W, Herfindal, J, Hicok, J, Hill, D, Hinson, E, Holcomb, C, Holland, L, Holland, C, Hollmann, E, Hollocombe, J, Holm, A, Holmes, I, Holtrop, K, Honda, M, Hong, R, Hood, R, Horton, A, Horvath, L, Hosokawa, M, Houshmandyar, S, Howard, N, Howell, E, Hoyt, D, Hu, W, Hu, Y, Hu, Q, Huang, J, Huang, Y, Hughes, J, Human, T, Humphreys, D, Huynh, P, Hyatt, A, Ibanez, C, Ibarra, L, Icasas, R, Ida, K, Igochine, V, In, Y, Inoue, S, Isayama, A, Izacard, O, Izzo, V, Jackson, A, Jacobsen, G, Jaervinen, A, Jalalvand, A, Janhunen, J, Jardin, S, Jarleblad, H, Jeon, Y, Ji, H, Jian, X, Joffrin, E, Johansen, A, Johnson, C, Johnson, T, Jones, C, Joseph, I, Jubas, D, Junge, B, Kalb, W, Kalling, R, Kamath, C, Kang, J, Kaplan, D, Kaptanoglu, A, Kasdorf, S, Kates-Harbeck, J, Kazantzidis, P, Kellman, A, Kellman, D, Kessel, C, Khumthong, K, Kim, E, Kim, H, Kim, J, Kim, S, Kim, K, Kim, C, Kimura, W, King, M, King, J, Kinsey, J, Kirk, A, Kiyan, B, Kleiner, A, Klevarova, V, Knapp, R, Knolker, M, Ko, W, Kobayashi, T, Koch, E, Kochan, M, Koel, B, Koepke, M, Kohn, A, Kolasinski, R, Kolemen, E, Kostadinova, E, Kostuk, M, Kramer, G, Kriete, D, Kripner, L, Kubota, S, Kulchar, J, Kwon, K, La Haye, R, Laggner, F, Lan, H, Lantsov, R, Lao, L, Esquisabel, A, Lasnier, C, Lau, C, Leard, B, Lee, J, Lee, R, Lee, M, Lee, Y, Lee, C, Lee, S, Lehnen, M, Leonard, A, Leppink, E, Lesher, M, Lestz, J, Leuer, J, Leuthold, N, Li, X, Li, K, Li, E, Li, G, Li, L, Li, Z, Li, J, Li, Y, Lin, Z, Lin, D, Liu, X, Liu, J, Liu, Y, Liu, T, Liu, C, Liu, Z, Liu, D, Liu, A, Loarte-Prieto, A, Lodestro, L, Logan, N, Lohr, J, Lombardo, B, Lore, J, Luan, Q, Luce, T, Di Cortemiglia, T, Luhmann, N, Lunsford, R, Luo, Z, Lvovskiy, A, Lyons, B, Ma, X, Madruga, M, Madsen, B, Maggi, C, Maheshwari, K, Mail, A, Mailloux, J, Maingi, R, Major, M, Makowski, M, Manchanda, R, Marini, C, Marinoni, A, Maris, A, 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G, Martinez, A, Palacios, L, Pan, C, Pan, Q, Pandit, R, Pandya, M, Pankin, A, Park, Y, Park, J, Parker, S, Parks, P, Parsons, M, Patel, B, Pawley, C, Paz-Soldan, C, Peebles, W, Pelton, S, Perillo, R, Petty, C, Peysson, Y, Pierce, D, Pigarov, A, Pigatto, L, Piglowski, D, Pinches, S, Pinsker, R, Piovesan, P, Piper, N, Pironti, A, Pitts, R, Pizzo, J, Plank, U, Podesta, M, Poli, E, Poli, F, Ponce, D, Popovic, Z, Porkolab, M, Porter, G, Powers, C, Powers, S, Prater, R, Pratt, Q, Pusztai, I, Qian, J, Qin, X, Ra, O, Rafiq, T, Raines, T, Raman, R, Rauch, J, Raymond, A, Rea, C, Reich, M, Reiman, A, Reinhold, S, Reinke, M, Reksoatmodjo, R, Ren, Q, Ren, Y, Ren, J, Rensink, M, Renteria, J, Rhodes, T, Rice, J, Roberts, R, Robinson, J, Fernandez, P, Rognlien, T, Rosenthal, A, Rosiello, S, Rost, J, Roveto, J, Rowan, W, Rozenblat, R, Ruane, J, Rudakov, D, Ruiz, J, Rupani, R, Saarelma, S, Sabbagh, S, Sachdev, J, Saenz, J, Saib, S, Salewski, M, Salmi, A, Sammuli, B, Samuell, C, Sandorfi, A, Sang, C, 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Tala, T, Tanaka, K, Tang, X, Tang, S, Tao, Y, Tao, R, Taussig, D, Taylor, T, Teixeira, K, Teo, K, Theodorsen, A, Thomas, D, Thome, K, Thorman, A, Thornton, A, Ti, A, Tillack, M, Timchenko, N, Tinguely, R, Tompkins, R, Tooker, J, De Sousa, A, Trevisan, G, Tripathi, S, Ochoa, A, Truong, D, Tsui, C, Turco, F, Turnbull, A, Umansky, M, Unterberg, E, Vaezi, P, Vail, P, Valdez, J, Valkis, W, Van Compernolle, B, Van Galen, J, Van Kampen, R, Van Zeeland, M, Verdoolaege, G, Vianello, N, Victor, B, Viezzer, E, Vincena, S, Wade, M, Waelbroeck, F, Wai, J, Wakatsuki, T, Walker, M, Wallace, G, Waltz, R, Wampler, W, Wang, L, Wang, H, Wang, Y, Wang, Z, Wang, G, Ward, S, Watkins, M, Watkins, J, Wehner, W, Wei, Y, Weiland, M, Weisberg, D, Welander, A, White, A, White, R, Wiesen, S, Wilcox, R, Wilks, T, Willensdorfer, M, Wilson, H, Wingen, A, Wolde, M, Wolff, M, Woller, K, Wolz, A, Wong, H, Woodruff, S, Wu, M, Wu, Y, Wukitch, S, Wurden, G, Xiao, W, Xie, R, Xing, Z, Xu, X, Xu, C, Xu, G, Yan, Z, Yang, X, Yang, S, Yokoyama, T, Yoneda, R, Yoshida, M, You, K, Younkin, T, Yu, J, Yu, M, Yu, G, Yuan, Q, Zaidenberg, L, Zakharov, L, Zamengo, A, Zamperini, S, Zarnstorff, M, Zeger, E, Zeller, K, Zeng, L, Zerbini, M, Zhang, L, Zhang, X, Zhang, R, Zhang, B, Zhang, J, Zhao, L, Zhao, B, Zheng, Y, Zheng, L, Zhu, B, Zhu, J, Zhu, Y, Zsutty, M, Zuin, M, Fenstermacher, ME, Paz, GC, Quiroga, JG, Munoz, MG, Esquisabel, AL, Di Cortemiglia, TL, Burgos, JM, Canal, GP, Martinez, AP, Fernandez, PR, Ruiz, JR, De Sousa, AT, and Ochoa, AT

Abstract

DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I (p) steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at similar to 8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I (p) beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stab

Published
2022

28. DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy

Author

Fenstermacher, M. E., Abbate, J., Abe, S., Abrams, T., Adams, M., Adamson, B., Aiba, N., Akiyama, T., Aleynikov, P., Allen, E., Allen, S., Anand, H., Anderson, J., Andrew, Y., Andrews, T., Appelt, D., Arbon, R., Ashikawa, N., Ashourvan, A., Aslin, M., Asnis, Y., Austin, M., Ayala, D., Bak, J., Bandyopadhyay, I., Banerjee, S., Barada, K., Bardoczi, L., Barr, J., Bass, E., Battaglia, D., Battey, A., Baumgartner, W., Baylor, L., Beckers, J., Beidler, M., Belli, E., Berkery, J., Bernard, T., Bertelli, N., Beurskens, M., Bielajew, R., Bilgili, S., Biswas, B., Blondel, S., Boedo, J., Bogatu, I., Boivin, R., Bolzonella, T., Bongard, M., Bonnin, X., Bonoli, P., Bonotto, M., Bortolon, A., Bose, S., Bosviel, N., Bouwmans, S., Boyer, M., Boyes, W., Bradley, L., Brambila, R., Brennan, D., Bringuier, S., Brodsky, L., Brookman, M., Brooks, J., Brower, D., Brown, G., Brown, W., Burke, M., Burrell, K., Butler, K., Buttery, R., Bykov, I., Byrne, P., Cacheris, A., Callahan, K., Callen, J., Campbell, G., Candy, J., Canik, J., Cano-Megias, P., Cao, N., Carayannopoulos, L., Carlstrom, T., Carrig, W., Carter, T., Cary, W., Casali, L., Cengher, M., Cespedes Paz, G., Chaban, R., Chan, V., Chapman, B., Char, I., Chattopadhyay, A., Chen, R., Chen, J., Chen, X., Chen, M., Chen, Z., Choi, M., Choi, W., Choi, G., Chousal, L., Chrobak, C., Chrystal, C., Chung, Y., Churchill, R., Cianciosa, M., Clark, J., Clement, M., Coda, S., Cole, A., Collins, C., Conlin, W., Cooper, A., Cordell, J., Coriton, B., Cote, T., Cothran, J., Creely, A., Crocker, N., Crowe, C., Crowley, B., Crowley, T., Cruz-Zabala, D., Cummings, D., Curie, M., Curreli, D., Dal Molin, A., Dannels, B., Dautt-Silva, A., Davda, K., De Tommasi, G., De Vries, P., Degrandchamp, G., Degrassie, J., Demers, D., Denk, S., Depasquale, S., Deshazer, E., Diallo, A., Diem, S., Dimits, A., Ding, R., Ding, S., Ding, W., Do, T., Doane, J., Dong, G., Donovan, D., Drake, J., Drews, W., Drobny, J., Du, X., Du, H., Duarte, V., Dudt, D., Dunn, C., Duran, J., Dvorak, A., Effenberg, F., Eidietis, N., Elder, D., Eldon, D., Ellis, R., Elwasif, W., Ennis, D., Erickson, K., Ernst, D., Fasciana, M., Fedorov, D., Feibush, E., Ferraro, N., Ferreira, J., Ferron, J., Fimognari, P., Finkenthal, D., Fitzpatrick, R., Fox, P., Fox, W., Frassinetti, L., Frerichs, H., Frye, H., Fu, Y., Gage, K., Galdon Quiroga, J., Gallo, A., Gao, Q., Garcia, A., Garcia Munoz, M., Garnier, D., Garofalo, A., Gattuso, A., Geng, D., Gentle, K., Ghosh, D., Giacomelli, L., Gibson, S., Gilson, E., Giroud, C., Glass, F., Glasser, A., Glibert, D., Gohil, P., Gomez, R., Gomez, S., Gong, X., Gonzales, E., Goodman, A., Gorelov, Y., Graber, V., Granetz, R., Gray, T., Green, D., Greenfield, C., Greenwald, M., Grierson, B., Groebner, R., Grosnickle, W., Groth, M., Grunloh, H., Gu, S., Guo, W., Guo, H., Gupta, P., Guterl, J., Guttenfelder, W., Guzman, T., Haar, S., Hager, R., Hahn, S., Halfmoon, M., Hall, T., Hallatschek, K., Halpern, F., Hammett, G., Han, H., Hansen, E., Hansen, C., Hansink, M., Hanson, J., Hanson, M., Hao, G., Harris, A., Harvey, R., Haskey, S., Hassan, E., Hassanein, A., Hatch, D., Hawryluk, R., Hayashi, W., Heidbrink, W., Herfindal, J., Hicok, J., Hill, D., Hinson, E., Holcomb, C., Holland, L., Holland, C., Hollmann, E., Hollocombe, J., Holm, A., Holmes, I., Holtrop, K., Honda, M., Hong, R., Hood, R., Horton, A., Horvath, L., Hosokawa, M., Houshmandyar, S., Howard, N., Howell, E., Hoyt, D., Hu, W., Hu, Y., Hu, Q., Huang, J., Huang, Y., Hughes, J., Human, T., Humphreys, D., Huynh, P., Hyatt, A., Ibanez, C., Ibarra, L., Icasas, R., Ida, K., Igochine, V., In, Y., Inoue, S., Isayama, A., Izacard, O., Izzo, V., Jackson, A., Jacobsen, G., Jaervinen, A., Jalalvand, A., Janhunen, J., Jardin, S., Jarleblad, H., Jeon, Y., Ji, H., Jian, X., Joffrin, E., Johansen, A., Johnson, C., Johnson, T., Jones, C., Joseph, I., Jubas, D., Junge, B., Kalb, W., Kalling, R., Kamath, C., Kang, J., Kaplan, D., Kaptanoglu, A., Kasdorf, S., Kates-Harbeck, J., Kazantzidis, P., Kellman, A., Kellman, D., Kessel, C., Khumthong, K., Kim, E., Kim, H., Kim, J., Kim, S., Kim, K., Kim, C., Kimura, W., King, M., King, J., Kinsey, J., Kirk, A., Kiyan, B., Kleiner, A., Klevarova, V., Knapp, R., Knolker, M., Ko, W., Kobayashi, T., Koch, E., Kochan, M., Koel, B., Koepke, M., Kohn, A., Kolasinski, R., Kolemen, E., Kostadinova, E., Kostuk, M., Kramer, G., Kriete, D., Kripner, L., Kubota, S., Kulchar, J., Kwon, K., La Haye, R., Laggner, F., Lan, H., Lantsov, R., Lao, L., Lasa Esquisabel, A., Lasnier, C., Lau, C., Leard, B., Lee, J., Lee, R., Lee, M., Lee, Y., Lee, C., Lee, S., Lehnen, M., Leonard, A., Leppink, E., Lesher, M., Lestz, J., Leuer, J., Leuthold, N., Li, X., Li, K., Li, E., Li, G., Li, L., Li, Z., Li, J., Li, Y., Lin, Z., Lin, D., Liu, X., Liu, J., Liu, Y., Liu, T., Liu, C., Liu, Z., Liu, D., Liu, A., Loarte-Prieto, A., Lodestro, L., Logan, N., Lohr, J., Lombardo, B., Lore, J., Luan, Q., Luce, T., Luda Di Cortemiglia, T., Luhmann, N., Lunsford, R., Luo, Z., Lvovskiy, A., Lyons, B., Ma, X., Madruga, M., Madsen, B., Maggi, C., Maheshwari, K., Mail, A., Mailloux, J., Maingi, R., Major, M., Makowski, M., Manchanda, R., Marini, C., Marinoni, A., Maris, A., Markovic, T., Marrelli, L., Martin, E., Mateja, J., Matsunaga, G., Maurizio, R., Mauzey, P., Mauzey, D., McArdle, G., McClenaghan, J., McCollam, K., McDevitt, C., McKay, K., McKee, G., McLean, A., Mehta, V., Meier, E., Menard, J., Meneghini, O., Merlo, G., Messer, S., Meyer, W., Michael, C., Michoski, C., Milne, P., Minet, G., Misleh, A., Mitrishkin, Y., Moeller, C., Montes, K., Morales, M., Mordijck, S., Moreau, D., Morosohk, S., Morris, P., Morton, L., Moser, A., Moyer, R., Moynihan, C., Mrazkova, T., Mueller, D., Munaretto, S., Munoz Burgos, J., Murphy, C., Murphy, K., Muscatello, C., Myers, C., Nagy, A., Nandipati, G., Navarro, M., Nave, F., Navratil, G., Nazikian, R., Neff, A., Neilson, G., Neiser, T., Neiswanger, W., Nelson, D., Nelson, A., Nespoli, F., Nguyen, R., Nguyen, L., Nguyen, X., Nichols, J., Nocente, M., Nogami, S., Noraky, S., Norausky, N., Nornberg, M., Nygren, R., Odstrcil, T., Ogas, D., Ogorman, T., Ohdachi, S., Ohtani, Y., Okabayashi, M., Okamoto, M., Olavson, L., Olofsson, E., Omullane, M., Oneill, R., Orlov, D., Orvis, W., Osborne, T., Pace, D., Paganini Canal, G., Pajares Martinez, A., Palacios, L., Pan, C., Pan, Q., Pandit, R., Pandya, M., Pankin, A., Park, Y., Park, J., Parker, S., Parks, P., Parsons, M., Patel, B., Pawley, C., Paz-Soldan, C., Peebles, W., Pelton, S., Perillo, R., Petty, C., Peysson, Y., Pierce, D., Pigarov, A., Pigatto, L., Piglowski, D., Pinches, S., Pinsker, R., Piovesan, P., Piper, N., Pironti, A., Pitts, R., Pizzo, J., Plank, U., Podesta, M., Poli, E., Poli, F., Ponce, D., Popovic, Z., Porkolab, M., Porter, G., Powers, C., Powers, S., Prater, R., Pratt, Q., Pusztai, I., Qian, J., Qin, X., Ra, O., Rafiq, T., Raines, T., Raman, R., Rauch, J., Raymond, A., Rea, C., Reich, M., Reiman, A., Reinhold, S., Reinke, M., Reksoatmodjo, R., Ren, Q., Ren, Y., Ren, J., Rensink, M., Renteria, J., Rhodes, T., Rice, J., Roberts, R., Robinson, J., Rodriguez Fernandez, P., Rognlien, T., Rosenthal, A., Rosiello, S., Rost, J., Roveto, J., Rowan, W., Rozenblat, R., Ruane, J., Rudakov, D., Ruiz Ruiz, J., Rupani, R., Saarelma, S., Sabbagh, S., Sachdev, J., Saenz, J., Saib, S., Salewski, M., Salmi, A., Sammuli, B., Samuell, C., Sandorfi, A., Sang, C., Sarff, J., Sauter, O., Schaubel, K., Schmitz, L., Schmitz, O., Schneider, J., Schroeder, P., Schultz, K., Schuster, E., Schwartz, J., Sciortino, F., Scotti, F., Scoville, J., Seltzman, A., Seol, S., Sfiligoi, I., Shafer, M., Sharapov, S., Shen, H., Sheng, Z., Shepard, T., Shi, S., Shibata, Y., Shin, G., Shiraki, D., Shousha, R., Si, H., Simmerling, P., Sinclair, G., Sinha, J., Sinha, P., Sips, G., Sizyuk, T., Skinner, C., Sladkomedova, A., Slendebroek, T., Slief, J., Smirnov, R., Smith, J., Smith, S., Smith, D., Snipes, J., Snoep, G., Snyder, A., Snyder, P., Solano, E., Solomon, W., Song, J., 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E., Abbate, J., Abe, S., Abrams, T., Adams, M., Adamson, B., Aiba, N., Akiyama, T., Aleynikov, P., Allen, E., Allen, S., Anand, H., Anderson, J., Andrew, Y., Andrews, T., Appelt, D., Arbon, R., Ashikawa, N., Ashourvan, A., Aslin, M., Asnis, Y., Austin, M., Ayala, D., Bak, J., Bandyopadhyay, I., Banerjee, S., Barada, K., Bardoczi, L., Barr, J., Bass, E., Battaglia, D., Battey, A., Baumgartner, W., Baylor, L., Beckers, J., Beidler, M., Belli, E., Berkery, J., Bernard, T., Bertelli, N., Beurskens, M., Bielajew, R., Bilgili, S., Biswas, B., Blondel, S., Boedo, J., Bogatu, I., Boivin, R., Bolzonella, T., Bongard, M., Bonnin, X., Bonoli, P., Bonotto, M., Bortolon, A., Bose, S., Bosviel, N., Bouwmans, S., Boyer, M., Boyes, W., Bradley, L., Brambila, R., Brennan, D., Bringuier, S., Brodsky, L., Brookman, M., Brooks, J., Brower, D., Brown, G., Brown, W., Burke, M., Burrell, K., Butler, K., Buttery, R., Bykov, I., Byrne, P., Cacheris, A., Callahan, K., Callen, J., Campbell, G., Candy, J., Canik, 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A., Kellman, D., Kessel, C., Khumthong, K., Kim, E., Kim, H., Kim, J., Kim, S., Kim, K., Kim, C., Kimura, W., King, M., King, J., Kinsey, J., Kirk, A., Kiyan, B., Kleiner, A., Klevarova, V., Knapp, R., Knolker, M., Ko, W., Kobayashi, T., Koch, E., Kochan, M., Koel, B., Koepke, M., Kohn, A., Kolasinski, R., Kolemen, E., Kostadinova, E., Kostuk, M., Kramer, G., Kriete, D., Kripner, L., Kubota, S., Kulchar, J., Kwon, K., La Haye, R., Laggner, F., Lan, H., Lantsov, R., Lao, L., Lasa Esquisabel, A., Lasnier, C., Lau, C., Leard, B., Lee, J., Lee, R., Lee, M., Lee, Y., Lee, C., Lee, S., Lehnen, M., Leonard, A., Leppink, E., Lesher, M., Lestz, J., Leuer, J., Leuthold, N., Li, X., Li, K., Li, E., Li, G., Li, L., Li, Z., Li, J., Li, Y., Lin, Z., Lin, D., Liu, X., Liu, J., Liu, Y., Liu, T., Liu, C., Liu, Z., Liu, D., Liu, A., Loarte-Prieto, A., Lodestro, L., Logan, N., Lohr, J., Lombardo, B., Lore, J., Luan, Q., Luce, T., Luda Di Cortemiglia, T., Luhmann, N., Lunsford, R., Luo, Z., Lvovskiy, A., Lyons, B., Ma, X., Madruga, M., Madsen, B., Maggi, C., Maheshwari, K., Mail, A., Mailloux, J., Maingi, R., Major, M., Makowski, M., Manchanda, R., Marini, C., Marinoni, A., Maris, A., Markovic, T., Marrelli, L., Martin, E., Mateja, J., Matsunaga, G., Maurizio, R., Mauzey, P., Mauzey, D., McArdle, G., McClenaghan, J., McCollam, K., McDevitt, C., McKay, K., McKee, G., McLean, A., Mehta, V., Meier, E., Menard, J., Meneghini, O., Merlo, G., Messer, S., Meyer, W., Michael, C., Michoski, C., Milne, P., Minet, G., Misleh, A., Mitrishkin, Y., Moeller, C., Montes, K., Morales, M., Mordijck, S., Moreau, D., Morosohk, S., Morris, P., Morton, L., Moser, A., Moyer, R., Moynihan, C., Mrazkova, T., Mueller, D., Munaretto, S., Munoz Burgos, J., Murphy, C., Murphy, K., Muscatello, C., Myers, C., Nagy, A., Nandipati, G., Navarro, M., Nave, F., Navratil, G., Nazikian, R., Neff, A., Neilson, G., Neiser, T., Neiswanger, W., Nelson, D., Nelson, A., Nespoli, F., Nguyen, R., Nguyen, L., Nguyen, X., Nichols, J., Nocente, M., Nogami, S., Noraky, S., Norausky, N., Nornberg, M., Nygren, R., Odstrcil, T., Ogas, D., Ogorman, T., Ohdachi, S., Ohtani, Y., Okabayashi, M., Okamoto, M., Olavson, L., Olofsson, E., Omullane, M., Oneill, R., Orlov, D., Orvis, W., Osborne, T., Pace, D., Paganini Canal, G., Pajares Martinez, A., Palacios, L., Pan, C., Pan, Q., Pandit, R., Pandya, M., Pankin, A., Park, Y., Park, J., Parker, S., Parks, P., Parsons, M., Patel, B., Pawley, C., Paz-Soldan, C., Peebles, W., Pelton, S., Perillo, R., Petty, C., Peysson, Y., Pierce, D., Pigarov, A., Pigatto, L., Piglowski, D., Pinches, S., Pinsker, R., Piovesan, P., Piper, N., Pironti, A., Pitts, R., Pizzo, J., Plank, U., Podesta, M., Poli, E., Poli, F., Ponce, D., Popovic, Z., Porkolab, M., Porter, G., Powers, C., Powers, S., Prater, R., Pratt, Q., Pusztai, I., Qian, J., Qin, X., Ra, O., Rafiq, T., Raines, T., Raman, R., Rauch, J., Raymond, A., Rea, C., Reich, M., Reiman, A., Reinhold, S., Reinke, M., Reksoatmodjo, R., Ren, Q., Ren, Y., Ren, J., Rensink, M., Renteria, J., Rhodes, T., Rice, J., Roberts, R., Robinson, J., Rodriguez Fernandez, P., Rognlien, T., Rosenthal, A., Rosiello, S., Rost, J., Roveto, J., Rowan, W., Rozenblat, R., Ruane, J., Rudakov, D., Ruiz Ruiz, J., Rupani, R., Saarelma, S., Sabbagh, S., Sachdev, J., Saenz, J., Saib, S., Salewski, M., Salmi, A., Sammuli, B., Samuell, C., Sandorfi, A., Sang, C., Sarff, J., Sauter, O., Schaubel, K., Schmitz, L., Schmitz, O., Schneider, J., Schroeder, P., Schultz, K., Schuster, E., Schwartz, J., Sciortino, F., Scotti, F., Scoville, J., Seltzman, A., Seol, S., Sfiligoi, I., Shafer, M., Sharapov, S., Shen, H., Sheng, Z., Shepard, T., Shi, S., Shibata, Y., Shin, G., Shiraki, D., Shousha, R., Si, H., Simmerling, P., Sinclair, G., Sinha, J., Sinha, P., Sips, G., Sizyuk, T., Skinner, C., Sladkomedova, A., Slendebroek, T., Slief, J., Smirnov, R., Smith, J., Smith, S., Smith, D., Snipes, J., Snoep, G., Snyder, A., Snyder, P., Solano, E., Solomon, W., Song, J., Sontag, A., Soukhanovskii, V., Spendlove, J., Spong, D., Squire, J., Srinivasan, C., Stacey, W., Staebler, G., Stagner, L., Stange, T., Stangeby, P., Stefan, R., Stemprok, R., Stephan, D., Stillerman, J., Stoltzfus-Dueck, T., Stonecipher, W., Storment, S., Strait, E., Su, D., Sugiyama, L., Sun, Y., Sun, P., Sun, Z., Sun, A., Sundstrom, D., Sung, C., Sungcoco, J., Suttrop, W., Suzuki, Y., Suzuki, T., Svyatkovskiy, A., Swee, C., Sweeney, R., Sweetnam, C., Szepesi, G., Takechi, M., Tala, T., Tanaka, K., Tang, X., Tang, S., Tao, Y., Tao, R., Taussig, D., Taylor, T., Teixeira, K., Teo, K., Theodorsen, A., Thomas, D., Thome, K., Thorman, A., Thornton, A., Ti, A., Tillack, M., Timchenko, N., Tinguely, R., Tompkins, R., Tooker, J., Torrezan De Sousa, A., Trevisan, G., Tripathi, S., Trujillo Ochoa, A., Truong, D., Tsui, C., Turco, F., Turnbull, A., Umansky, M., Unterberg, E., Vaezi, P., Vail, P., Valdez, J., Valkis, W., Van Compernolle, B., Van Galen, J., Van Kampen, R., Van Zeeland, M., Verdoolaege, G., Vianello, N., Victor, B., Viezzer, E., Vincena, S., Wade, M., Waelbroeck, F., Wai, J., Wakatsuki, T., Walker, M., Wallace, G., Waltz, R., Wampler, W., Wang, L., Wang, H., Wang, Y., Wang, Z., Wang, G., Ward, S., Watkins, M., Watkins, J., Wehner, W., Wei, Y., Weiland, M., Weisberg, D., Welander, A., White, A., White, R., Wiesen, S., Wilcox, R., Wilks, T., Willensdorfer, M., Wilson, H., Wingen, A., Wolde, M., Wolff, M., Woller, K., Wolz, A., Wong, H., Woodruff, S., Wu, M., Wu, Y., Wukitch, S., Wurden, G., Xiao, W., Xie, R., Xing, Z., Xu, X., Xu, C., Xu, G., Yan, Z., Yang, X., Yang, S., Yokoyama, T., Yoneda, R., Yoshida, M., You, K., Younkin, T., Yu, J., Yu, M., Yu, G., Yuan, Q., Zaidenberg, L., Zakharov, L., Zamengo, A., Zamperini, S., Zarnstorff, M., Zeger, E., Zeller, K., Zeng, L., Zerbini, M., Zhang, L., Zhang, X., Zhang, R., Zhang, B., Zhang, J., Zhao, L., Zhao, B., Zheng, Y., Zheng, L., Zhu, B., Zhu, J., Zhu, Y., Zsutty, M., and Zuin, M.

Abstract

DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I p steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at ∼8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I p beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stability limit

Published
2022

32. DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy

Author

Fenstermacher, M. E., primary, Abbate, J., additional, Abe, S., additional, Abrams, T., additional, Adams, M., additional, Adamson, B., additional, Aiba, N., additional, Akiyama, T., additional, Aleynikov, P., additional, Allen, E., additional, Allen, S., additional, Anand, H., additional, Anderson, J., additional, Andrew, Y., additional, Andrews, T., additional, Appelt, D., additional, Arbon, R., additional, Ashikawa, N., additional, Ashourvan, A., additional, Aslin, M., additional, Asnis, Y., additional, Austin, M., additional, Ayala, D., additional, Bak, J., additional, Bandyopadhyay, I., additional, Banerjee, S., additional, Barada, K., additional, Bardoczi, L., additional, Barr, J., additional, Bass, E., additional, Battaglia, D., additional, Battey, A., additional, Baumgartner, W., additional, Baylor, L., additional, Beckers, J., additional, Beidler, M., additional, Belli, E., additional, Berkery, J., additional, Bernard, T., additional, Bertelli, N., additional, Beurskens, M., additional, 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2022
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47. Advances in physics understanding of high poloidal beta regime toward steady-state operation of CFETR

Author

Qian, J. P., primary, Garofalo, A. M., additional, Gong, X. Z., additional, Huang, J., additional, Ding, S. Y., additional, Holcomb, C. T., additional, Hyatt, A., additional, Ferron, J., additional, McClenaghan, J., additional, McKee, G., additional, Kotschenreuther, M., additional, Wu, M. Q., additional, Shi, S. Y., additional, Li, M. H., additional, Zhu, X., additional, Sun, Y. W., additional, Xu, G. S., additional, Wang, L., additional, Chen, J. L., additional, Zang, Q., additional, Zhang, B., additional, Zhang, L., additional, Liu, H. Q., additional, Lyu, B., additional, Guo, W. F., additional, Pan, C. K., additional, Ren, Q., additional, Li, G. Q., additional, Wang, H. Q., additional, Zhang, X. J., additional, Pinsker, R. I., additional, Staebler, G. M., additional, and Lao, L. L., additional

Published
2021
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49. “Very Early” Intrahepatic Cholangiocarcinoma in Cirrhotic Patients: Should Liver Transplantation Be Reconsidered in These Patients?

Author

Sapisochin, G., Rodríguez de Lope, C., Gastaca, M., Ortiz de Urbina, J., Suarez, M. A., Santoyo, J., Castroagudín, J. F., Varo, E., López-Andujar, R., Palacios, F., Sanchez Antolín, G., Perez, B., Guiberteau, A., Blanco, G., González-Diéguez, M. L., Rodriguez, M., Varona, M. A., Barrera, M. A., Fundora, Y., Ferron, J. A., Ramos, E., Fabregat, J., Ciria, R., Rufian, S., Otero, A., Vazquez, M. A., Pons, J. A., Parrilla, P., Zozaya, G., Herrero, J. I., Charco, R., and Bruix, J.

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2014
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