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26 results on '"Morace, A."'

1. Optimization of laser-driven quantum beam generation and the applications with artificial intelligence

Author

Kuramitsu, Y., primary, Taguchi, T., additional, Nikaido, F., additional, Minami, T., additional, Hihara, T., additional, Suzuki, S., additional, Oda, K., additional, Kuramoto, K., additional, Yasui, T., additional, Abe, Y., additional, Ibano, K., additional, Takabe, H., additional, Chu, C. M., additional, Wu, K. T., additional, Woon, W. Y., additional, Chen, S. H., additional, Jao, C. S., additional, Chen, Y. C., additional, Liu, Y. L., additional, Morace, A., additional, Yogo, A., additional, Arikawa, Y., additional, Kohri, H., additional, Tokiyasu, A., additional, Kodaira, S., additional, Kusumoto, T., additional, Kanasaki, M., additional, Asai, T., additional, Fukuda, Y., additional, Kondo, K., additional, Kiriyama, H., additional, Hayakawa, T., additional, Tanaka, S. J., additional, Isayama, S., additional, Watamura, N., additional, Suzuki, H., additional, Kumar, H. S., additional, Ohnishi, N., additional, Pikuz, T., additional, Filippov, E., additional, Sakai, K., additional, Yasuhara, R., additional, Nakata, M., additional, Ishikawa, R., additional, Hoshi, T., additional, Mizuta, A., additional, Bolouki, N., additional, Saura, N., additional, Benkadda, S., additional, Koenig, M., additional, and Hamaguchi, S., additional

Published
2024
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2. Realizing laser-driven deuteron acceleration with low energy spread via in situ D2O-deposited target.

Author

Wei, Tianyun, Arikawa, Yasunobu, Mirfayzi, Seyed Reza, Gu, Yanjun, Hayakawa, Takehito, Morace, Alessio, Mima, Kunioki, Lan, Zechen, Yamada, Ryuya, Yamanoi, Kohei, Honda, Koichi, Bulanov, Sergei V., and Yogo, Akifumi

Abstract

Generation of quasi-monoenergetic ion pulse by laser-driven acceleration is one of the hot topics in laser plasma physics. In this study, we present a new method for the in situ deposition of an ultra-thin D2O layer on the surface of an aluminum foil target utilizing a spherical D2O capsule. Employing a 1019 W/cm2 laser, we achieve the acceleration of 10.8 MeV deuterons with an energy spread of ΔE/E = 4.6% in the most favorable shot. The energy spread depends on the exposure time of the D2O capsule in the vacuum chamber. This method has the potential to extend its applicability to other ion species. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Guided electromagnetic discharge pulses driven by short intense laser pulses: Characterization and modeling

Author

Ehret, M., primary, Bailly-Grandvaux, M., additional, Korneev, Ph., additional, Apiñaniz, J. I., additional, Brabetz, C., additional, Morace, A., additional, Bradford, P., additional, d'Humières, E., additional, Schaumann, G., additional, Bagnoud, V., additional, Malko, S., additional, Matveevskii, K., additional, Roth, M., additional, Volpe, L., additional, Woolsey, N. C., additional, and Santos, J. J., additional

Published
2023
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4. Erratum: “First demonstration of ARC-accelerated proton beams at the National Ignition Facility” [Physics of Plasmas 26, 043110 (2019)]

Author

Mariscal, D., primary, Ma, T., additional, Wilks, S. C., additional, Kemp, A. J., additional, Williams, G. J., additional, Michel, P., additional, Chen, H., additional, Patel, P. K., additional, Remington, B. A., additional, Bowers, M., additional, Pelz, L., additional, Hermann, M. R., additional, Hsing, W., additional, Martinez, D., additional, Sigurdsson, R., additional, Prantil, M., additional, Conder, A., additional, Lawson, J., additional, Hamamoto, M., additional, Di Nicola, P., additional, Widmayer, C., additional, Hoemoelle, D., additional, Lowe-Webb, R., additional, Herriot, S., additional, Williams, W., additional, Alessi, D., additional, Kalantar, D., additional, Zacharias, R., additional, Haefner, C., additional, Thompson, N., additional, Zobrist, T., additional, Lord, D., additional, Hash, N., additional, Pak, A., additional, Lemos, N., additional, Tabak, M., additional, McGuffey, C., additional, Kim, J., additional, Beg, F. N., additional, Wei, M. S., additional, Norreys, P., additional, Morace, A., additional, Iwata, N., additional, Sentoku, Y., additional, Neely, D., additional, Scott, G. G., additional, Flippo, K., additional, Gatu-Johnson, M., additional, and Lahmann, B., additional

Published
2020
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5. First demonstration of ARC-accelerated proton beams at the National Ignition Facility

Author

D. Neely, Gerald Williams, Mingsheng Wei, Constantin Haefner, S. Herriot, Graeme Scott, L. Pelz, Bruce Remington, R. Sigurdsson, C. C. Widmayer, Mark W. Bowers, D. M. Lord, David Alessi, Pierre Michel, Mark R. Hermann, P. K. Patel, T. Zobrist, Kirk Flippo, N. Hash, Scott Wilks, Arthur Pak, N. Iwata, Yasuhiko Sentoku, N. B. Thompson, R. Zacharias, P. Di Nicola, Matthew A. Prantil, Tammy Ma, Daniel H. Kalantar, Derek Mariscal, Hui Chen, Farhat Beg, Wade H. Williams, D. Homoelle, David Martinez, Andreas Kemp, R. Lowe-Webb, Max Tabak, C. McGuffey, Nuno Lemos, Peter Norreys, Alessio Morace, M. Hamamoto, Janice K. Lawson, Joungmok Kim, W. W. Hsing, and A. Conder

Subjects
Physics, Proton, business.industry, Condensed Matter Physics, Laser, 01 natural sciences, 010305 fluids & plasmas, law.invention, Particle acceleration, Acceleration, Optics, law, 0103 physical sciences, Particle, Physics::Accelerator Physics, Irradiation, 010306 general physics, National Ignition Facility, business, Inertial confinement fusion
Abstract

New short-pulse kilojoule, Petawatt-class lasers, which have recently come online and are coupled to large-scale, many-beam long-pulse facilities, undoubtedly serve as very exciting tools to capture transformational science opportunities in high energy density physics. These short-pulse lasers also happen to reside in a unique laser regime: very high-energy (kilojoule), relatively long (multi-picosecond) pulse-lengths, and large (10s of micron) focal spots, where their use in driving energetic particle beams is largely unexplored. Proton acceleration via Target Normal Sheath Acceleration (TNSA) using the Advanced Radiographic Capability (ARC) short-pulse laser at the National Ignition Facility in the Lawrence Livermore National Laboratory is demonstrated for the first time, and protons of up to 18 MeV are measured using laser irradiation of >1 ps pulse-lengths and quasi-relativistic (∼1018 W/cm2) intensities. This is indicative of a super-ponderomotive electron acceleration mechanism that sustains acceleration over long (multi-picosecond) time-scales and allows for proton energies to be achieved far beyond what the well-established scalings of proton acceleration via TNSA would predict at these modest intensities. Furthermore, the characteristics of the ARC laser (large ∼100 μm diameter focal spot, flat spatial profile, multi-picosecond, relatively low prepulse) provide acceleration conditions that allow for the investigation of 1D-like particle acceleration. A high flux ∼ 50 J of laser-accelerated protons is experimentally demonstrated. A new capability in multi-picosecond particle-in-cell simulation is applied to model the data, corroborating the high proton energies and elucidating the physics of multi-picosecond particle acceleration.

Published
2019

6. Erratum: 'First demonstration of ARC-accelerated proton beams at the National Ignition Facility' [Physics of Plasmas 26, 043110 (2019)]

Author

Derek Mariscal, Tammy Ma, Gerald Williams, Wade H. Williams, Daniel H. Kalantar, H. Chen, S. Herriot, N. Hash, Kirk Flippo, D. M. Lord, Graeme Scott, Janice K. Lawson, Mark W. Bowers, Alessio Morace, Max Tabak, David Alessi, Mark R. Hermann, Joungmok Kim, Peter Norreys, Yasuhiko Sentoku, N. B. Thompson, M. Hamamoto, Maria Gatu-Johnson, Brandon Lahmann, Nuno Lemos, C. C. Widmayer, Matthew A. Prantil, David Neely, David Martinez, N. Iwata, T. Zobrist, R. Sigurdsson, A. Conder, D. Hoemoelle, F. N. Beg, Arthur Pak, Mingsheng Wei, Bruce Remington, L. Pelz, Pierre Michel, P. K. Patel, C. McGuffey, Andreas Kemp, R. Lowe-Webb, Constantin Haefner, P. Di Nicola, R. Zacharias, W. W. Hsing, and Scott Wilks

Subjects
Nuclear physics, Arc (geometry), Physics, Proton, Plasma, Condensed Matter Physics, National Ignition Facility
Published
2020

7. First demonstration of ARC-accelerated proton beams at the National Ignition Facility

Author

Mariscal, D., primary, Ma, T., additional, Wilks, S. C., additional, Kemp, A. J., additional, Williams, G. J., additional, Michel, P., additional, Chen, H., additional, Patel, P. K., additional, Remington, B. A., additional, Bowers, M., additional, Pelz, L., additional, Hermann, M. R., additional, Hsing, W., additional, Martinez, D., additional, Sigurdsson, R., additional, Prantil, M., additional, Conder, A., additional, Lawson, J., additional, Hamamoto, M., additional, Di Nicola, P., additional, Widmayer, C., additional, Homoelle, D., additional, Lowe-Webb, R., additional, Herriot, S., additional, Williams, W., additional, Alessi, D., additional, Kalantar, D., additional, Zacharias, R., additional, Haefner, C., additional, Thompson, N., additional, Zobrist, T., additional, Lord, D., additional, Hash, N., additional, Pak, A., additional, Lemos, N., additional, Tabak, M., additional, McGuffey, C., additional, Kim, J., additional, Beg, F. N., additional, Wei, M. S., additional, Norreys, P., additional, Morace, A., additional, Iwata, N., additional, Sentoku, Y., additional, Neely, D., additional, Scott, G. G., additional, and Flippo, K., additional

Published
2019
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8. Laser-driven strong magnetostatic fields with applications to charged beam transport and magnetized high energy-density physics

Author

Santos, J. J., primary, Bailly-Grandvaux, M., additional, Ehret, M., additional, Arefiev, A. V., additional, Batani, D., additional, Beg, F. N., additional, Calisti, A., additional, Ferri, S., additional, Florido, R., additional, Forestier-Colleoni, P., additional, Fujioka, S., additional, Gigosos, M. A., additional, Giuffrida, L., additional, Gremillet, L., additional, Honrubia, J. J., additional, Kojima, S., additional, Korneev, Ph., additional, Law, K. F. F., additional, Marquès, J.-R., additional, Morace, A., additional, Mossé, C., additional, Peyrusse, O., additional, Rose, S., additional, Roth, M., additional, Sakata, S., additional, Schaumann, G., additional, Suzuki-Vidal, F., additional, Tikhonchuk, V. T., additional, Toncian, T., additional, Woolsey, N., additional, and Zhang, Z., additional

Published
2018
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9. Development of x-ray radiography for high energy density physics

Author

S. Hulin, Joao Santos, Mingsheng Wei, S. D. Baton, Farhat Beg, Nicola Piovella, A. Margarit, D. Batani, Luca Fedeli, Mitsuo Nakai, Alessio Morace, Luca Volpe, Motoaki Nakatsutsumi, P. Nicolai, X. Vaisseau, and Leonard Jarrott

Subjects
Physics, business.industry, Warm dense matter, Condensed Matter Physics, Laser, Shock (mechanics), law.invention, Ignition system, Optics, Flow velocity, Industrial radiography, law, Plasma diagnostics, business, Inertial confinement fusion
Abstract

We describe an experiment performed at the LULI laser facility using an advanced radiographic technique that allowed obtaining 2D, spatially resolved images of a shocked buried-code-target. The technique is suitable for applications on Fast Ignition as well as Warm Dense Matter research. In our experiment, it allowed to show cone survival up to Mbar pressures and to measure the shock front velocity and the fluid velocity associated to the laser-generated shock. This allowed obtaining one point on the shock polar of porous carbon.

Published
2014
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10. Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field

Author

Fujioka, Shinsuke, primary, Arikawa, Yasunobu, additional, Kojima, Sadaoki, additional, Johzaki, Tomoyuki, additional, Nagatomo, Hideo, additional, Sawada, Hiroshi, additional, Lee, Seung Ho, additional, Shiroto, Takashi, additional, Ohnishi, Naofumi, additional, Morace, Alessio, additional, Vaisseau, Xavier, additional, Sakata, Shohei, additional, Abe, Yuki, additional, Matsuo, Kazuki, additional, Farley Law, King Fai, additional, Tosaki, Shota, additional, Yogo, Akifumi, additional, Shigemori, Keisuke, additional, Hironaka, Yoichiro, additional, Zhang, Zhe, additional, Sunahara, Atsushi, additional, Ozaki, Tetsuo, additional, Sakagami, Hitoshi, additional, Mima, Kunioki, additional, Fujimoto, Yasushi, additional, Yamanoi, Kohei, additional, Norimatsu, Takayoshi, additional, Tokita, Shigeki, additional, Nakata, Yoshiki, additional, Kawanaka, Junji, additional, Jitsuno, Takahisa, additional, Miyanaga, Noriaki, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Kondo, Kotaro, additional, Bailly-Grandvaux, Mathieu, additional, Bellei, Claudio, additional, Santos, João Jorge, additional, and Azechi, Hiroshi, additional

Published
2016
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11. Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field

Author

Yasunobu Arikawa, Atsushi Sunahara, Yoichiro Hironaka, Tomoyuki Johzaki, Takashi Shiroto, S. Tosaki, Claudio Bellei, Hiroshi Sawada, Yuki Abe, Tetsuo Ozaki, Junji Kawanaka, Shohei Sakata, Takayoshi Norimatsu, Hiroshi Azechi, S. Lee, H. Shiraga, Zhe Zhang, Hitoshi Sakagami, Sadaoki Kojima, Takahisa Jitsuno, Mitsuo Nakai, Kunioki Mima, Mathieu Bailly-Grandvaux, Hiroaki Nishimura, Noriaki Miyanaga, Alessio Morace, Akifumi Yogo, King Fai Farley Law, Shigeki Tokita, Kazuki Matsuo, Joao Santos, Yoshiki Nakata, Yasushi Fujimoto, Naofumi Ohnishi, Kohei Yamanoi, Kotaro Kondo, Keisuke Shigemori, Shinsuke Fujioka, Hideo Nagatomo, and X. Vaisseau

Subjects
Shock wave, Physics, business.industry, Implosion, Plasma, Condensed Matter Physics, Laser, 01 natural sciences, 010305 fluids & plasmas, law.invention, Magnetic mirror, Optics, law, 0103 physical sciences, Relativistic electron beam, Plasma diagnostics, 010306 general physics, business, Inertial confinement fusion
Abstract

A petawatt laser for fast ignition experiments (LFEX) laser system [N. Miyanaga et al., J. Phys. IV France 133, 81 (2006)], which is currently capable of delivering 2 kJ in a 1.5 ps pulse using 4 laser beams, has been constructed beside the GEKKO-XII laser facility for demonstrating efficient fast heating of a dense plasma up to the ignition temperature under the auspices of the Fast Ignition Realization EXperiment (FIREX) project [H. Azechi et al., Nucl. Fusion 49, 104024 (2009)]. In the FIREX experiment, a cone is attached to a spherical target containing a fuel to prevent a corona plasma from entering the path of the intense heating LFEX laser beams. The LFEX laser beams are focused at the tip of the cone to generate a relativistic electron beam (REB), which heats a dense fuel core generated by compression of a spherical deuterized plastic target induced by the GEKKO-XII laser beams. Recent studies indicate that the current heating efficiency is only 0.4%, and three requirements to achieve higher efficiency of the fast ignition (FI) scheme with the current GEKKO and LFEX systems have been identified: (i) reduction of the high energy tail of the REB; (ii) formation of a fuel core with high areal density using a limited number (twelve) of GEKKO-XII laser beams as well as a limited energy (4 kJ of 0.53-μm light in a 1.3 ns pulse); (iii) guiding and focusing of the REB to the fuel core. Laser–plasma interactions in a long-scale plasma generate electrons that are too energetic to efficiently heat the fuel core. Three actions were taken to meet the first requirement. First, the intensity contrast of the foot pulses to the main pulses of the LFEX was improved to >109. Second, a 5.5-mm-long cone was introduced to reduce pre-heating of the inner cone wall caused by illumination of the unconverted 1.053-μm light of implosion beam (GEKKO-XII). Third, the outside of the cone wall was coated with a 40-μm plastic layer to protect it from the pressure caused by imploding plasma. Following the above improvements, conversion of 13% of the LFEX laser energy to a low energy portion of the REB, whose slope temperature is 0.7 MeV, which is close to the ponderomotive scaling value, was achieved. To meet the second requirement, the compression of a solid spherical ball with a diameter of 200-μm to form a dense core with an areal density of ∼0.07 g/cm2 was induced by a laser-driven spherically converging shock wave. Converging shock compression is more hydrodynamically stable compared to shell implosion, while a hot spot cannot be generated with a solid ball target. Solid ball compression is preferable also for compressing an external magnetic field to collimate the REB to the fuel core, due to the relatively small magnetic Reynolds number of the shock compressed region. To meet the third requirement, we have generated a strong kilo-tesla magnetic field using a laser-driven capacitor-coil target. The strength and time history of the magnetic field were characterized with proton deflectometry and a B-dot probe. Guidance of the REB using a 0.6-kT field in a planar geometry has been demonstrated at the LULI 2000 laser facility. In a realistic FI scenario, a magnetic mirror is formed between the REB generation point and the fuel core. The effects of the strong magnetic field on not only REB transport but also plasma compression were studied using numerical simulations. According to the transport calculations, the heating efficiency can be improved from 0.4% to 4% by the GEKKO and LFEX laser system by meeting the three requirements described above. This efficiency is scalable to 10% of the heating efficiency by increasing the areal density of the fuel core.

Published
2016

12. Development of x-ray radiography for high energy density physics

Author

Morace, A., primary, Fedeli, L., additional, Batani, D., additional, Baton, S., additional, Beg, F. N., additional, Hulin, S., additional, Jarrott, L. C., additional, Margarit, A., additional, Nakai, M., additional, Nakatsutsumi, M., additional, Nicolai, P., additional, Piovella, N., additional, Wei, M. S., additional, Vaisseau, X., additional, Volpe, L., additional, and Santos, J. J., additional

Published
2014
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13. Propagation of a short-pulse laser-driven electron beam in matter

Author

L. Volpe, D. Batani, G. Birindelli, A. Morace, P. Carpeggiani, M. H. Xu, F. Liu, Y. Zhang, Z. Zhang, X. X. Lin, S. J. Wang, P. F. Zhu, L. M. Meng, Z. H. Wang, Y. T. Li, Z. M. Sheng, Z. Y. Wei, J. Zhang, J. J. Santos, C. Spindloe, Volpe, L, Batani, D, Birindelli, G, Morace, A, Carpeggiani, P, Xu, M, Liu, F, Zhang, Y, Zhang, Z, Lin, X, Wang, S, Zhu, P, Meng, L, Wang, Z, Li, Y, Sheng, Z, Wei, Z, Zhang, J, Santos, J, and Spindloe, C

Subjects
Physics, business.industry, chemistry.chemical_element, Condensed Matter Physics, Laser, Spectral line, Intensity (physics), law.invention, Optics, chemistry, Aluminium, law, Cathode ray, Irradiation, Atomic physics, Luminescence, business, Titanium
Abstract

We studied the transport of an intense electron beam produced by high intensity laser pulses through metals and insulators. Targets were irradiated at two different intensities, 1017 W/cm2 and 1019 W/cm2, at the laser facility Xtreme Light XL-III in Beijing, a Ti:Sa laser source emitting 40 fs pulses at 800 nm. The main diagnostic was Cu - K α fluorescence imaging. Images of K α spots have been collected for those two laser intensities, for different target thickness, and for different materials. Experimental results are analyzed taking into account both collisional and collective effects as well as refluxing at the edge of the target. The target temperature is evaluated to be Tc ∼ 6 eV for intensity I 1017 W/cm2 (for all the tested materials: plastic, aluminium, and copper), and Tc ∼ 60 eV in aluminium and 120 eV in titanium for intensity I 1019 W/cm2. © 2013 American Institute of Physics.

Published
2013

15. Investigation of relativistic intensity laser generated hot electron dynamics via copper Kα imaging and proton acceleration

Author

Joohwan Kim, Louise Willingale, Anatoly Maksimchuk, R.B. Stephens, Karl Krushelnick, Mingsheng Wei, Teresa Bartal, F. N. Beg, A. G. R. Thomas, and Alessio Morace

Subjects
Physics, Electron density, Proton, Electron, Condensed Matter Physics, Laser, law.invention, Relativistic plasma, law, Electric field, Cathode ray, Physics::Accelerator Physics, Plasma diagnostics, Atomic physics
Abstract

Simultaneous experimental measurements of copper Kα imaging and the maximum target normal sheath acceleration proton energies from the rear target surface are compared for various target thicknesses. For the T-cubed laser (≈4 J, 400 fs) at an intensity of ≈2 × 1019 W cm−2, the hot electron divergence is determined to be θHW HM≈22° using a Kα imaging diagnostic. The maximum proton energies are measured to follow the expected reduction with increasing target thickness. Numerical modeling produces copper Kα trends for both signal level and electron beam divergence that are in good agreement with the experiment. A geometric model describing the electron beam divergence reproduces the maximum proton energy trends observed from the experiment and the fast electron density and the peak electric field observed in the numerical modeling.

Published
2013

16. Comparisons of angularly and spectrally resolved Bremsstrahlung measurements to two-dimensional multi-stage simulations of short-pulse laser-plasma interactions

Author

Chen, C. D., primary, Kemp, A. J., additional, Pérez, F., additional, Link, A., additional, Beg, F. N., additional, Chawla, S., additional, Key, M. H., additional, McLean, H., additional, Morace, A., additional, Ping, Y., additional, Sorokovikova, A., additional, Stephens, R. B., additional, Streeter, M., additional, Westover, B., additional, and Patel, P. K., additional

Published
2013
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17. Propagation of a short-pulse laser-driven electron beam in matter

Author

Volpe, L., primary, Batani, D., additional, Birindelli, G., additional, Morace, A., additional, Carpeggiani, P., additional, Xu, M. H., additional, Liu, F., additional, Zhang, Y., additional, Zhang, Z., additional, Lin, X. X., additional, Wang, S. J., additional, Zhu, P. F., additional, Meng, L. M., additional, Wang, Z. H., additional, Li, Y. T., additional, Sheng, Z. M., additional, Wei, Z. Y., additional, Zhang, J., additional, Santos, J. J., additional, and Spindloe, C., additional

Published
2013
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19. Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field.

Author

Shinsuke Fujioka, Yasunobu Arikawa, Sadaoki Kojima, Tomoyuki Johzaki, Hideo Nagatomo, Hiroshi Sawada, Seung Ho Lee, Takashi Shiroto, Naofumi Ohnishi, Alessio Morace, Xavier Vaisseau, Shohei Sakata, Yuki Abe, Kazuki Matsuo, King Fai Farley Law, Shota Tosaki, Akifumi Yogo, Keisuke Shigemori, Yoichiro Hironaka, and Zhe Zhang

Subjects
LARMOR radius, PINCH effect (Physics), MAGNETIC fields, ELECTROMAGNETISM, ELECTROMAGNETIC theory
Abstract

A petawatt laser for fast ignition experiments (LFEX) laser system [N. Miyanaga et al., J. Phys. IV France 133, 81 (2006)], which is currently capable of delivering 2 kJ in a 1.5 ps pulse using 4 laser beams, has been constructed beside the GEKKO-XII laser facility for demonstrating efficient fast heating of a dense plasma up to the ignition temperature under the auspices of the Fast Ignition Realization EXperiment (FIREX) project [H. Azechi et al., Nucl. Fusion 49, 104024 (2009)]. In the FIREX experiment, a cone is attached to a spherical target containing a fuel to prevent a corona plasma from entering the path of the intense heating LFEX laser beams. The LFEX laser beams are focused at the tip of the cone to generate a relativistic electron beam (REB), which heats a dense fuel core generated by compression of a spherical deuterized plastic target induced by the GEKKO-XII laser beams. Recent studies indicate that the current heating efficiency is only 0.4%, and three requirements to achieve higher efficiency of the fast ignition (FI) scheme with the current GEKKO and LFEX systems have been identified: (i) reduction of the high energy tail of the REB; (ii) formation of a fuel core with high areal density using a limited number (twelve) of GEKKOXII laser beams as well as a limited energy (4 kJ of 0.53-μm light in a 1.3 ns pulse); (iii) guiding and focusing of the REB to the fuel core. Laser-plasma interactions in a long-scale plasma generate electrons that are too energetic to efficiently heat the fuel core. Three actions were taken to meet the first requirement. First, the intensity contrast of the foot pulses to the main pulses of the LFEX was improved to >109. Second, a 5.5-mm-long cone was introduced to reduce pre-heating of the inner cone wall caused by illumination of the unconverted 1.053-μm light of implosion beam (GEKKO-XII). Third, the outside of the cone wall was coated with a 40-μm plastic layer to protect it from the pressure caused by imploding plasma. Following the above improvements, conversion of 13% of the LFEX laser energy to a low energy portion of the REB, whose slope temperature is 0.7 MeV, which is close to the ponderomotive scaling value, was achieved. To meet the second requirement, the compression of a solid spherical ball with a diameter of 200-μm to form a dense core with an areal density of ~0.07 g/cm2 was induced by a laser-driven spherically converging shock wave. Converging shock compression is more hydrodynamically stable compared to shell implosion, while a hot spot cannot be generated with a solid ball target. Solid ball compression is preferable also for compressing an external magnetic field to collimate the REB to the fuel core, due to the relatively small magnetic Reynolds number of the shock compressed region. To meet the third requirement, we have generated a strong kilo-tesla magnetic field using a laser-driven capacitor- coil target. The strength and time history of the magnetic field were characterized with proton deflectometry and a B-dot probe. Guidance of the REB using a 0.6-kT field in a planar geometry has been demonstrated at the LULI 2000 laser facility. In a realistic FI scenario, a magnetic mirror is formed between the REB generation point and the fuel core. The effects of the strong magnetic field on not only REB transport but also plasma compression were studied using numerical simulations. According to the transport calculations, the heating efficiency can be improved from 0.4% to 4% by the GEKKO and LFEX laser system by meeting the three requirements described above. This efficiency is scalable to 10% of the heating efficiency by increasing the areal density of the fuel core. [ABSTRACT FROM AUTHOR]

Published
2016
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20. Comparisons of angularly and spectrally resolved Bremsstrahlung measurements to two-dimensional multi-stage simulations of short-pulse laser-plasma interactions

Author

Alessio Morace, A. Sorokovikova, Cui Chen, Farhat Beg, B. Westover, M. H. Key, Harry McLean, S. Chawla, F. Perez, Richard B. Stephens, A. Link, Andreas Kemp, P. K. Patel, Yuan Ping, and M. J. V. Streeter

Subjects
Physics, business.industry, Bremsstrahlung, Plasma, Electron, Condensed Matter Physics, Laser, Intensity (physics), law.invention, Optics, Planar, law, Plasma diagnostics, Irradiation, business
Abstract

A 2-D multi-stage simulation model incorporating realistic laser conditions and a fully resolved electron distribution handoff has been developed and compared to angularly and spectrally resolved Bremsstrahlung measurements from high-Z planar targets. For near-normal incidence and 0.5-1 × 1020 W/cm2 intensity, particle-in-cell (PIC) simulations predict the existence of a high energy electron component consistently directed away from the laser axis, in contrast with previous expectations for oblique irradiation. Measurements of the angular distribution are consistent with a high energy component when directed along the PIC predicted direction, as opposed to between the target normal and laser axis as previously measured.

Published
2013

21. Proton radiography of laser-driven imploding target in cylindrical geometry

Author

Volpe, L., primary, Batani, D., additional, Vauzour, B., additional, Nicolai, Ph., additional, Santos, J. J., additional, Regan, C., additional, Morace, A., additional, Dorchies, F., additional, Fourment, C., additional, Hulin, S., additional, Perez, F., additional, Baton, S., additional, Lancaster, K., additional, Galimberti, M., additional, Heathcote, R., additional, Tolley, M., additional, Spindloe, Ch., additional, Koester, P., additional, Labate, L., additional, Gizzi, L. A., additional, Benedetti, C., additional, Sgattoni, A., additional, Richetta, M., additional, Pasley, J., additional, Beg, F., additional, Chawla, S., additional, Higginson, D. P., additional, and MacPhee, A. G., additional

Published
2011
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22. Study of plasma heating induced by fast electrons

Author

Morace, A., primary, Magunov, A., additional, Batani, D., additional, Redaelli, R., additional, Fourment, C., additional, Santos, J. J., additional, Malka, G., additional, Boscheron, A., additional, Casner, A., additional, Nazarov, W., additional, Vinci, T., additional, Okano, Y., additional, Inubushi, Y., additional, Nishimura, H., additional, Flacco, A., additional, Spindloe, C., additional, and Tolley, M., additional

Published
2009
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23. Temperature profiles derived from transverse optical shadowgraphy in ultraintense laser plasma interactions at 6×1020 W cm−2

Author

Lancaster, K. L., primary, Pasley, J., additional, Green, J. S., additional, Batani, D., additional, Baton, S., additional, Evans, R. G., additional, Gizzi, L., additional, Heathcote, R., additional, Hernandez Gomez, C., additional, Koenig, M., additional, Koester, P., additional, Morace, A., additional, Musgrave, I., additional, Norreys, P. A., additional, Perez, F., additional, Waugh, J. N., additional, and Woolsey, N. C., additional

Published
2009
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24. Inhibition of fast electron energy deposition due to preplasma filling of cone-attached targets

Author

Baton, S. D., primary, Koenig, M., additional, Fuchs, J., additional, Benuzzi-Mounaix, A., additional, Guillou, P., additional, Loupias, B., additional, Vinci, T., additional, Gremillet, L., additional, Rousseaux, C., additional, Drouin, M., additional, Lefebvre, E., additional, Dorchies, F., additional, Fourment, C., additional, Santos, J. J., additional, Batani, D., additional, Morace, A., additional, Redaelli, R., additional, Nakatsutsumi, M., additional, Kodama, R., additional, Nishida, A., additional, Ozaki, N., additional, Norimatsu, T., additional, Aglitskiy, Y., additional, Atzeni, S., additional, and Schiavi, A., additional

Published
2008
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25. Temperature profiles derived from transverse optical shadowgraphy in ultraintense laser plasma interactions at 6×1020 W cm-2.

Author

Lancaster, K. L., Pasley, J., Green, J. S., Batani, D., Baton, S., Evans, R. G., Gizzi, L., Heathcote, R., Hernandez Gomez, C., Koenig, M., Koester, P., Morace, A., Musgrave, I., Norreys, P. A., Perez, F., Waugh, J. N., and Woolsey, N. C.

Subjects
LASER plasmas, HYDRODYNAMICS, SHADOWGRAPH photography, OPTICAL measurements, ELECTRON distribution
Abstract

A variety of targets with different dimensions and materials was irradiated using the VULCAN PW laser [C. N. Danson et al., Nucl. Fusion 44, S239 (2004)]. Using transverse optical shadowgraphy in conjunction with a one-dimensional radiation hydrodynamics code it was possible to determine a longitudinal temperature gradient. It was demonstrated for thick targets with a low Z substrate and a thin higher Z tracer layer at the rear that the boundary between the two materials was Rayleigh–Taylor unstable. By including a simple bubble growth model into the calculations it was possible to correct for the associated behavior with regard to temperature. The resulting temperature gradient was in good agreement with the previously published data using two different methods of determining the temperature. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
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26. Temperature profiles derived from transverse optical shadowgraphy in ultraintense laser plasma interactions at 6×1020 W cm-2.

Author

Lancaster, K. L., Pasley, J., Green, J. S., Batani, D., Baton, S., Evans, R. G., Gizzi, L., Heathcote, R., Hernandez Gomez, C., Koenig, M., Koester, P., Morace, A., Musgrave, I., Norreys, P. A., Perez, F., Waugh, J. N., and Woolsey, N. C.

Subjects
*LASER plasmas, *HYDRODYNAMICS, *SHADOWGRAPH photography, *OPTICAL measurements, *ELECTRON distribution
Abstract

A variety of targets with different dimensions and materials was irradiated using the VULCAN PW laser [C. N. Danson et al., Nucl. Fusion 44, S239 (2004)]. Using transverse optical shadowgraphy in conjunction with a one-dimensional radiation hydrodynamics code it was possible to determine a longitudinal temperature gradient. It was demonstrated for thick targets with a low Z substrate and a thin higher Z tracer layer at the rear that the boundary between the two materials was Rayleigh–Taylor unstable. By including a simple bubble growth model into the calculations it was possible to correct for the associated behavior with regard to temperature. The resulting temperature gradient was in good agreement with the previously published data using two different methods of determining the temperature. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

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