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Ablating Ion Velocity Distributions in Short-Pulse-Heated Solids via X-Ray Doppler Shifts.
Kraus, B F; Gao, Lan; Fox, W; Hill, K W; Bitter, M; Efthimion, P C; Moreau, A; Hollinger, R; Wang, Shoujun; Song, Huanyu; Rocca, J J.
Affiliation
  • Kraus BF; Department of Astrophysical Sciences, Princeton University, Princeton, 08544 New Jersey, USA.
  • Gao L; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Fox W; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Hill KW; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Bitter M; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Efthimion PC; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Moreau A; Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
  • Hollinger R; Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA.
  • Wang S; Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA.
  • Song H; Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA.
  • Rocca JJ; Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA.
Phys Rev Lett ; 129(23): 235001, 2022 Dec 02.
Article in En | MEDLINE | ID: mdl-36563203
ABSTRACT
Solids ablate under laser irradiation, but experiments have not previously characterized the initiation of this process at ultrarelativistic laser intensities. We present first measurements of bulk ion velocity distributions as ablation begins, captured as a function of depth via Doppler-shifted x-ray line emission from two viewing angles. Bayesian analysis indicates that bulk ions are either nearly stationary or flowing outward at the plasma sound speed. The measurements quantitatively constrain the laser-plasma ablation mechanism, suggesting that a steplike electrostatic potential structure drives solid disassembly.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2022 Document type: Article Affiliation country: United States
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2022 Document type: Article Affiliation country: United States