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310 results on '"Jaeger, E. F."'

1. Coupled Fusion Simulation Using the Common Component Architecture

Author

Elwasif, Wael R., Batchelor, Donald B., Bernholdt, David E., Berry, Lee A., D’Azevedo, Ed F., Houlberg, Wayne A., Jaeger, E. F., Kohl, James A., Li, Shuhui, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sunderam, Vaidy S., editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack J., editor

Published
2005
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2. The design of the Tokamak Physics Experiment (TPX)

Author

Schmidt, J. A., Thomassen, K. I., Goldston, R. J., Neilson, G. H., Nevins, W. M., Sinnis, J. C., Andersen, P., Bair, W., Barr, W. L., Batchelor, D. B., Baxi, C., Berg, G., Bernabei, S., Bialek, J. M., Bonoli, P. T., Boozer, A., Bowers, D., Bronner, G., Brooks, J. N., Brown, T. G., Bulmer, R., Butner, D., Campbell, R., Casper, T., Chaniotakis, E., Chaplin, M., Chen, S. J., Chin, E., Chrzanowski, J., Citrolo, J., Cole, M. J., Dahlgren, F., Davis, F. C., Davis, J., Davis, S., Diatchenko, N., Dinkevich, S., Feldshteyn, Y., Felker, B., Feng, T., Fenstermacher, M. E., Fleming, R., Fogarty, P. J., Fragetta, W., Fredd, E., Gabler, M., Galambos, J., Gohar, Y., Goranson, P. L., Greenough, N., Grisham, L. R., Haines, J., Haney, S., Hassenzahl, W., Heim, J., Heitzenroeder, P. J., Hill, D. N., Hodapp, T., Houlberg, W. A., Hubbard, A., Hyatt, A., Jackson, M., Jaeger, E. F., Jardin, S. C., Johnson, J., Jones, G. H., Juliano, D. R., Junge, R., Kalish, M., Kessel, C. E., Knutson, D., LaHaye, R. J., Lang, D. D., Langley, R. A., Liew, S. -L., Lu, E., Mantz, H., Manickam, J., Mau, T. K., Medley, S., Mikkelsen, D. R., Miller, R., Monticello, D., Morgan, D., Moroz, P., Motloch, C., Mueller, J., Myatt, L., Nelson, B. E., Neumeyer, C. L., Nilson, D., O'Conner, T., Pearlstein, L. D., Peebles, W. A., Pelovitz, M., Perkins, F. W., Perkins, L. J., Petersen, D., Pillsbury, R., Politzer, P. A., Pomphrey, N., Porkolab, M., Posey, A., Radovinsky, A., Raftopoulis, S., Ramakrishnan, S., Ramos, J., Rauch, W., Ravenscroft, D., Redler, K., Reiersen, W. T., Reiman, A., Reis, E., Rewoldt, G., Richards, D. J., Rocco, R., Rognlien, T. D., Ruzic, D., Sabbagh, S., Sapp, J., Sayer, R. O., Scharer, J. E., Schmitz, L., Schnitz, J., Sevier, L., Shipley, S. E., Simmons, R. T., Slack, D., Smith, G. R., Stambaugh, R., Steill, G., Stevenson, T., Stoenescu, S., Onge, K. T. St., Stotler, D. P., Strait, T., Strickler, D. J., Swain, D. W., Tang, W., Tuszewski, M., Ulrickson, M. A., VonHalle, A., Walker, M. S., Wang, C., Wang, P., Warren, J., Werley, K. A., West, W. P., Williams, F., Wong, R., Wright, K., Wurden, G. A., Yugo, J. J., Zakharov, L., and Zbasnik, J.

Published
1993
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4. Advances in High-harmonic Fast Wave Physics in the National Spherical Torus Experiment

Author

Taylor, G, primary, Hosea, J C, additional, LeBlanc, B P, additional, Phillips, C K, additional, Podesta, M, additional, Valeo, E J, additional, Wilson, J R, additional, Ahn, J -W, additional, Chen, G, additional, Green, D L, additional, Jaeger, E F, additional, Maingi, R, additional, Ryan, P M, additional, Wilgen, J B, additional, Heidbrink, W W, additional, Liu, D, additional, Bonoli, P T, additional, Brecht, T, additional, and Choi, M, additional

Published
2009
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5. First Direct Observation of Runaway-Electron-Driven Whistler Waves in Tokamaks

Author

Spong, D. A., primary, Heidbrink, W. W., additional, Paz-Soldan, C., additional, Du, X. D., additional, Thome, K. E., additional, Van Zeeland, M. A., additional, Collins, C., additional, Lvovskiy, A., additional, Moyer, R. A., additional, Austin, M. E., additional, Brennan, D. P., additional, Liu, C., additional, Jaeger, E. F., additional, and Lau, C., additional

Published
2018
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7. Characteristics of a cylindrical Langmuir probe of finite length.

Author

Jaeger, E. F., Berry, L. A., and Batchelor, D. B.

Subjects
*ELECTRONIC probes, *PLASMA frequencies, *POISSON'S equation
Abstract

Examines the characteristics of a cylindrical Langmuir probe of finite length using the Poisson-Vlasov system of equation. Characteristics of the probes; Numerical technique for solving the problem of a finite-length cylindrical probe; Ion orbits and space potential.

Published
1991
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13. Effect of the scrape-off layer in AORSA full wave simulations of fast wave minority, mid/high harmonic, and helicon heating regimes

Author

Bertelli, N., primary, Jaeger, E. F., additional, Lau, C., additional, Blazevski, D., additional, Green, D. L., additional, Berry, L., additional, Bonoli, P. T., additional, Gerhardt, S., additional, Hosea, J. C., additional, LeBlanc, B., additional, Perkins, R. J., additional, Phillips, C. K., additional, Pinsker, R. I., additional, Prater, R., additional, Qin, C. M., additional, Ryan, P. M., additional, Taylor, G., additional, Valeo, E. J., additional, Wilson, J. R., additional, Wright, J. C., additional, and Zhang, X. J., additional

Published
2015
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14. Using AORSA to simulate helicon waves in DIII-D

Author

Lau, C., primary, Jaeger, E. F., additional, Bertelli, N., additional, Berry, L. A., additional, Blazevski, D., additional, Green, D. L., additional, Murakami, M., additional, Park, J. M., additional, Pinsker, R. I., additional, and Prater, R., additional

Published
2015
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15. Status of the benchmark activity of ICRF full-wave codes within EUROfusion WPCD and beyond.

Author

Bilato, R., Bertelli, N., Brambilla, M., Dumont, R., Jaeger, E. F., Johnson, T., Lerche, E., Sauter, O., Van Eester, D., and Villard, L.

Subjects
INFORMATION sharing, BENCHMARKING (Management), THEORY of wave motion, PLASMA interactions, TOKAMAKS
Abstract

As follow-up of the benchmark activity of ICRF full-wave codes within the EUROfusion Code Development for Integrated Modelling project (WPCD), a simple-to-complex approach has been devised for verification of the European ICRF codes, imported in the European-Integrated Modelling infrastructure, which represents a unique environment for input-data sharing and result analysis. This benchmark activity has been recently extended to non-European codes, in particular the ICRF full-wave AORSA code. Here we discussed the results of this benchmark. [ABSTRACT FROM AUTHOR]

Published
2015
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17. Fast wave heating in the NSTX-Upgrade device

Author

Bertelli, N., primary, Jaeger, E. F., additional, Berry, L., additional, Bonoli, P. T., additional, Budny, R., additional, Fu, G.-Y., additional, Gerhardt, S., additional, Green, D. L., additional, Harvey, R. W., additional, Hosea, J. C., additional, Kramer, G. J., additional, LeBlanc, B., additional, Perkins, R. J., additional, Phillips, C. K., additional, Ryan, P., additional, Taylor, G., additional, Valeo, E. J., additional, Wilson, J. R., additional, and Wright, J. C., additional

Published
2014
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18. Towards identifying the mechanisms underlying field-aligned edge-loss of HHFW power on NSTX

Author

Perkins, R. J., primary, Ahn, J-W., additional, Bell, R. E., additional, Bertelli, N., additional, Diallo, A., additional, Gerhardt, S., additional, Gray, T. K., additional, Green, D. L., additional, Jaeger, E. F., additional, Hosea, J. C., additional, Jaworski, M. A., additional, LeBlanc, B. P., additional, Kramer, G. J., additional, McLean, A., additional, Maingi, R., additional, Phillips, C. K., additional, Podestà, M., additional, Roquemore, L., additional, Ryan, P. M., additional, Sabbagh, S., additional, Scotti, F., additional, Taylor, G., additional, and Wilson, J. R., additional

Published
2014
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19. Effect of Collisional Heat Transfer in ICRF Power Modulation Experiment on ASDEX Upgrade.

Author

Tsujii, N., D'Inca, R., Noterdaeme, J.-M., Bilato, R., Bobkov, Vl. V., Brambilla, M., Van Eester, D., Harvey, R. W., Jaeger, E. F., Lerche, E. A., and Schneider, P.

Subjects
CYCLOTRON resonance, PHYSICS research, PARTICLES (Nuclear physics), QUANTUM electrodynamics, COLLISIONS (Nuclear physics), PARTICLE physics, HEAT transfer, COUPLING constants
Abstract

ICRF (ion cyclotron range of frequencies) heating experiments were performed in D-H plasmas at various H concentrations on ASDEX Upgrade. The rf power was modulated to measure the electron power deposition profile from electron temperature modulation. To minimize the contribution from indirect collisional heating and the effect of radial transport, the rf power was modulated at 50 Hz. However, peaking of electron temperature modulation was still observed around the hydrogen cyclotron resonance indicating collisional heating contribution. Time dependent simulation of the hydrogen distribution function was performed for the discharges, using the full-wave code AORSA (E.F. Jaeger, et al., Phys. Plasmas, Vol. 8, page 1573 (2001)) coupled to the Fokker-Planck code CQL3D (R.W. Harvey, et al., Proc. IAEA (1992)). In the present experimental conditions, it was found that modulation of the collisional heating was comparable to that of direct wave damping. Impact of radial transport was also analyzed and found to appreciably smear out the modulation profile and reduce the phase delay. [ABSTRACT FROM AUTHOR]

Published
2014
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20. Towards Identifying The Mechanisms Underlying Field-Aligned Edge-Loss Of HHFW Power On NSTX.

Author

Perkins, R. J., Ahn, J-W, Bell, R. E., Bertelli, N., Diallo, A., Gerhardt, S., Gray, T. K., Green, D. L., Jaeger, E. F., Hosea, J. C., Jaworski, M. A., LeBlanc, B. P., Kramer, G. J., McLean, A., Maingi, R., Phillips, C. K., Podestà, M., Roquemore, L., Ryan, P. M., and Sabbagh, S.

Subjects
PLASMA gases, RADIOFREQUENCY heating, CURRENT-drive heating, FUSION reactor divertors, MAGNETIC fields, LOW temperature plasmas, PLASMA boundary layers
Abstract

Fast-wave heating will be a major heating scheme on ITER, as it can heat ions directly and is relatively unaffected by the large machine size unlike neutral beams. However, fast-wave interactions with the plasma edge can lead to deleterious effects such as, in the case of the high-harmonic fast-wave (HHFW) system on NSTX, large losses of fast-wave power in the scrape off layer (SOL) under certain conditions. In such scenarios, a large fraction of the lost HHFW power is deposited on the upper and lower divertors in bright spiral shapes. The responsible mechanism(s) has not yet been identified but may include fast-wave propagation in the scrape off layer, parametric decay instability, and RF currents driven by the antenna reactive fields. Understanding and mitigating these losses is important not only for improving the heating and current-drive on NSTX-Upgrade but also for understanding fast-wave propagation across the SOL in any fast-wave system. This talk summarizes experimental results demonstrating that the flow of lost HHFW power to the divertor regions largely follows the open SOL magnetic field lines. This lost power flux is relatively large close to both the antenna and the last closed flux surface with a reduced level in between, so the loss mechanism cannot be localized to the antenna. At the same time, significant losses also occur along field lines connected to the inboard edge of the bottom antenna plate. The power lost within the spirals is roughly estimated, showing that these field-aligned losses to the divertor are significant but may not account for the total HHFW loss. To elucidate the role of the onset layer for perpendicular fast-wave propagation with regards to fast-wave propagation in the SOL, a cylindrical cold-plasma model is being developed. This model, in addition to advanced RF codes such as TORIC and AORSA, is aimed at identifying the underlying mechanism(s) behind these SOL losses, to minimize their effects in NSTX-U, and to predict their importance in ITER. [ABSTRACT FROM AUTHOR]

Published
2014
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22. High-Harmonic Fast-Wave Power Flow along Magnetic Field Lines in the Scrape-Off Layer of NSTX

Author

Perkins, R. J., primary, Hosea, J. C., additional, Kramer, G. J., additional, Ahn, J.-W., additional, Bell, R. E., additional, Diallo, A., additional, Gerhardt, S., additional, Gray, T. K., additional, Green, D. L., additional, Jaeger, E. F., additional, Jaworski, M. A., additional, LeBlanc, B. P., additional, McLean, A., additional, Maingi, R., additional, Phillips, C. K., additional, Roquemore, L., additional, Ryan, P. M., additional, Sabbagh, S., additional, Taylor, G., additional, and Wilson, J. R., additional

Published
2012
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30. Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment

Author

Taylor, G., primary, Bell, R. E., additional, Hosea, J. C., additional, LeBlanc, B. P., additional, Phillips, C. K., additional, Podesta, M., additional, Valeo, E. J., additional, Wilson, J. R., additional, Ahn, J-W., additional, Chen, G., additional, Green, D. L., additional, Jaeger, E. F., additional, Maingi, R., additional, Ryan, P. M., additional, Wilgen, J. B., additional, Heidbrink, W. W., additional, Liu, D., additional, Bonoli, P. T., additional, Brecht, T., additional, Choi, M., additional, and Harvey, R. W., additional

Published
2010
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35. Simulation of high-power electromagnetic wave heating in the ITER burning plasma

Author

Jaeger, E. F., primary, Berry, L. A., additional, D’Azevedo, E. F., additional, Barrett, R. F., additional, Ahern, S. D., additional, Swain, D. W., additional, Batchelor, D. B., additional, Harvey, R. W., additional, Myra, J. R., additional, D’Ippolito, D. A., additional, Phillips, C. K., additional, Valeo, E., additional, Smithe, D. N., additional, Bonoli, P. T., additional, Wright, J. C., additional, and Choi, M., additional

Published
2008
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36. Integrated physics advances in simulation of wave interactions with extended MHD phenomena

Author

Batchelor, D B, primary, D'Azevedo, E, additional, Bateman, G, additional, Bernholdt, D E, additional, Berry, L A, additional, Bonoli, P T, additional, Bramley, R, additional, Breslau, J, additional, Chance, M, additional, Chen, J, additional, Choi, M, additional, Elwasif, W, additional, Fu, G-Y, additional, Harvey, R W, additional, Houlberg, W A, additional, Jaeger, E F, additional, Jardin, S C, additional, Keyes, D, additional, Klasky, S, additional, Kruger, S, additional, Ku, L P, additional, McCune, D, additional, Ramos, J, additional, Schissel, D P, additional, Schnack, D, additional, and Wright, J C, additional

Published
2007
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37. Evolution of nonthermal particle distributions in radio frequency heating of fusion plasmas

Author

Bonoli, P T, primary, Batchelor, D B, additional, Berry, L A, additional, Choi, M, additional, D'Ippolito, D A, additional, Harvey, R W, additional, Jaeger, E F, additional, Myra, J R, additional, Phillips, C K, additional, Smithe, D N, additional, Tang, V, additional, Valeo, E, additional, Wright, J C, additional, Brambilla, M, additional, Bilato, R, additional, Lancellotti, V, additional, and Maggiora, R, additional

Published
2007
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40. Physics Research in the SciDAC Center for Wave-Plasma Interactions

Author

Bonoli, P. T., primary, Batchelor, D. B., additional, Berry, L. A., additional, Choi, M., additional, D'Ippolito, D. A., additional, Harvey, R. W., additional, Jaeger, E. F., additional, Myra, J. R., additional, Phillips, C. K., additional, Smithe, D. N., additional, Valeo, E., additional, Wright, J. C., additional, Brambilla, M., additional, Bilato, R., additional, Lancellotti, V., additional, Maggiora, R., additional, Ryan, Philip M., additional, and Rasmussen, David, additional

Published
2007
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41. Quasilinear Evolution of Multiple Non-thermal Ion Distributions in ICRF Heating

Author

Jaeger, E. F., primary, Berry, L. A., additional, Harvey, R. W., additional, Phillips, C. K., additional, Myra, J. R., additional, Smithe, D. N., additional, Batchelor, D. B., additional, Bonoli, P. T., additional, Carter, M. D., additional, Choi, M., additional, D'Azevedo, E., additional, D'Ippolito, D. A., additional, Valeo, E. J., additional, Wright, J. C., additional, Ryan, Philip M., additional, and Rasmussen, David, additional

Published
2007
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44. Self-consistent full-wave and Fokker-Planck calculations for ion cyclotron heating in non-Maxwellian plasmas

Author

Jaeger, E. F., primary, Berry, L. A., additional, Ahern, S. D., additional, Barrett, R. F., additional, Batchelor, D. B., additional, Carter, M. D., additional, D'Azevedo, E. F., additional, Moore, R. D., additional, Harvey, R. W., additional, Myra, J. R., additional, D’Ippolito, D. A., additional, Dumont, R. J., additional, Phillips, C. K., additional, Okuda, H., additional, Smithe, D. N., additional, Bonoli, P. T., additional, Wright, J. C., additional, and Choi, M., additional

Published
2006
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46. Electromagnetic mode conversion: understanding waves that suddenly change their nature

Author

Batchelor, D B, primary, Berry, L A, additional, Bonoli, P T, additional, Carter, M D, additional, Choi, M, additional, D'Azevedo, E, additional, D'Ippolito, D A, additional, Gorelenkov, N, additional, Harvey, R W, additional, Jaeger, E F, additional, Myra, J R, additional, Okuda, H, additional, Phillips, C K, additional, Smithe, D N, additional, and Wright, J C, additional

Published
2005
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49. Fast ion absorption of the high harmonic fast wave in the National Spherical Torus Experiment

Author

Rosenberg, A. L., primary, Menard, J. E., additional, Wilson, J. R., additional, Medley, S. S., additional, Andre, R., additional, Phillips, C. K., additional, Darrow, D. S., additional, LeBlanc, B. P., additional, Redi, M. H., additional, Fisch, N. J., additional, Team, NSTX, additional, Harvey, R. W., additional, Mau, T. K., additional, Jaeger, E. F., additional, Ryan, P. M., additional, Swain, D. W., additional, Sabbagh, S. A., additional, and Egedal, J., additional

Published
2004
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50. Predicting HHFW Heating Efficiency on NSTX via Whole-Device Full-Wave Simulation.

Author

Green, D. L., Jaeger, E. F., Berry, L. A., and Ryan, P. M.

Subjects
*PREDICTION models, *ELECTRIC heating, *PHYSICS experiments, *SIMULATION methods & models, *QUALITATIVE research, *NUCLEAR reactors, *NONLINEAR theories
Abstract

We present a qualitative comparison of NSTX HHFW heating efficiency observations[1, 2] with results from the AORSA[3] whole-device, linear simulation. The simulation retains a realistic geometry and core plasma kinetic physics such that scrape-off plasma linear RF fields can be calculated. By examining L-mode and neutral beam heated H-mode scenarios we quantify the conditions that result in a fast-wave coaxial mode in the scrape-off plasma. These large amplitude coaxial modes are expected to damp on collisions or couple to non-linear damping mechanisms and be correlated to an observed drop in core heating efficiency. [ABSTRACT FROM AUTHOR]

Published
2011
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