Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons
The Bremsstrahlung and K-shell emission from 1×1×1 mm[superscript 3] planar targets irradiated by a short-pulse 3×10[superscript 18]–8×10[superscript 19] W/cm[superscript 2] laser were measured. The Bremsstrahlung was measured using a filter stack spectrometer with spectral discrimination up to 50...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics
2010
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| Online Access: | http://hdl.handle.net/1721.1/52297 https://orcid.org/0000-0002-9518-4097 |
| _version_ | 1826205892609048576 |
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| author | Chen, C. D. Patel, P. K. Hey, D. S. Mackinnon, A. J. Key, M. H. Akli, K. U. Bartal, T. Beg, F. N. Chawla, S. Chen, H. Freeman, R. R. Higginson, D. P. Link, A. Ma, T. Y. MacPhee, A. G. Stephens, R. B. Van Woerkom, L. D. Westover, B. Porkolab, Miklos |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Chen, C. D. Patel, P. K. Hey, D. S. Mackinnon, A. J. Key, M. H. Akli, K. U. Bartal, T. Beg, F. N. Chawla, S. Chen, H. Freeman, R. R. Higginson, D. P. Link, A. Ma, T. Y. MacPhee, A. G. Stephens, R. B. Van Woerkom, L. D. Westover, B. Porkolab, Miklos |
| author_sort | Chen, C. D. |
| collection | MIT |
| description | The Bremsstrahlung and K-shell emission from 1×1×1 mm[superscript 3] planar targets irradiated by a short-pulse 3×10[superscript 18]–8×10[superscript 19] W/cm[superscript 2] laser were measured. The Bremsstrahlung was measured using a filter stack spectrometer with spectral discrimination up to 500 keV. K-shell emission was measured using a single photon counting charge coupled device. From Monte Carlo modeling of the target emission, conversion efficiencies into 1–3 MeV electrons of 3%–12%, representing 20%–40% total conversion efficiencies, were inferred for intensities up to 8×10[superscript 19] W/cm[superscript 2]. Comparisons to scaling laws using synthetic energy spectra generated from the intensity distribution of the focal spot imply slope temperatures less than the ponderomotive potential of the laser. Resistive transport effects may result in potentials of a few hundred kV in the first few tens of microns in the target. This would lead to higher total conversion efficiencies than inferred from Monte Carlo modeling but lower conversion efficiencies into 1–3 MeV electrons. |
| first_indexed | 2024-09-23T13:20:41Z |
| format | Article |
| id | mit-1721.1/52297 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:20:41Z |
| publishDate | 2010 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/522972022-09-28T13:32:36Z Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons Chen, C. D. Patel, P. K. Hey, D. S. Mackinnon, A. J. Key, M. H. Akli, K. U. Bartal, T. Beg, F. N. Chawla, S. Chen, H. Freeman, R. R. Higginson, D. P. Link, A. Ma, T. Y. MacPhee, A. G. Stephens, R. B. Van Woerkom, L. D. Westover, B. Porkolab, Miklos Massachusetts Institute of Technology. Plasma Science and Fusion Center Porkolab, Miklos Chen, C. D. Porkolab, Miklos The Bremsstrahlung and K-shell emission from 1×1×1 mm[superscript 3] planar targets irradiated by a short-pulse 3×10[superscript 18]–8×10[superscript 19] W/cm[superscript 2] laser were measured. The Bremsstrahlung was measured using a filter stack spectrometer with spectral discrimination up to 500 keV. K-shell emission was measured using a single photon counting charge coupled device. From Monte Carlo modeling of the target emission, conversion efficiencies into 1–3 MeV electrons of 3%–12%, representing 20%–40% total conversion efficiencies, were inferred for intensities up to 8×10[superscript 19] W/cm[superscript 2]. Comparisons to scaling laws using synthetic energy spectra generated from the intensity distribution of the focal spot imply slope temperatures less than the ponderomotive potential of the laser. Resistive transport effects may result in potentials of a few hundred kV in the first few tens of microns in the target. This would lead to higher total conversion efficiencies than inferred from Monte Carlo modeling but lower conversion efficiencies into 1–3 MeV electrons. Lawrence Livermore National Laboratory 2010-03-04T14:37:01Z 2010-03-04T14:37:01Z 2009-08 2009-04 Article http://purl.org/eprint/type/JournalArticle 1070-664X http://hdl.handle.net/1721.1/52297 Chen, C. D. et al. “Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons.” Physics of Plasmas 16.8 (2009): 082705-10. © 2009 American Institute of Physics https://orcid.org/0000-0002-9518-4097 en_US http://dx.doi.org/10.1063/1.3183693 Physics of Plasmas Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics Carol Arlington |
| spellingShingle | Chen, C. D. Patel, P. K. Hey, D. S. Mackinnon, A. J. Key, M. H. Akli, K. U. Bartal, T. Beg, F. N. Chawla, S. Chen, H. Freeman, R. R. Higginson, D. P. Link, A. Ma, T. Y. MacPhee, A. G. Stephens, R. B. Van Woerkom, L. D. Westover, B. Porkolab, Miklos Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title | Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title_full | Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title_fullStr | Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title_full_unstemmed | Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title_short | Bremsstrahlung and K alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| title_sort | bremsstrahlung and k alpha fluorescence measurements for inferring conversion efficiencies into fast ignition relevant hot electrons |
| url | http://hdl.handle.net/1721.1/52297 https://orcid.org/0000-0002-9518-4097 |
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