Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas

Chen, S. N.; Atzeni, S.; Gangolf, T.; Gauthier, M.; Higginson, D. P.; Hua, R.; Kim, J.; Mangia, F.; McGuffey, C.; Marquès, J. -R.; Riquier, R.; Pépin, H.; Shepherd, R.; Willi, O.; Beg, F. N.; Deutsch, C.; Fuchs, J.

doi:10.1038/s41598-018-32726-2

Title: Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas

Journal Article · Mon Oct 01 00:00:00 EDT 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-32726-2· OSTI ID:1619584

Chen, S. N.;

;

; Gauthier, M.;

; Hua, R.; Kim, J.; Mangia, F.;

; Marquès, J. -R.; Riquier, R.; Pépin, H.; Shepherd, R.; Willi, O.; Beg, F. N.; Deutsch, C.; Fuchs, J.

Here, our understanding of the dynamics of ion collisional energy loss in a plasma is still not complete, in part due to the difficulty and lack of high-quality experimental measurements. These measurements are crucial to benchmark existing models. Here, we show that such a measurement is possible using high-flux proton beams accelerated by high intensity short pulse lasers, where there is a high number of particles in a picosecond pulse, which is ideal for measurements in quickly expanding plasmas. By reducing the energy bandwidth of the protons using a passive selector, we have made proton stopping measurements in partially ionized Argon and fully ionized Hydrogen plasmas with electron temperatures of hundreds of eV and densities in the range 10²⁰–10²¹ cm^–3. In the first case, we have observed, consistently with previous reports, enhanced stopping of protons when compared to stopping power in non-ionized gas. In the second case, we have observed for the first time the regime of reduced stopping, which is theoretically predicted in such hot and fully ionized plasma. The versatility of these tunable short-pulse laser based ion sources, where the ion type and energy can be changed at will, could open up the possibility for a variety of ion stopping power measurements in plasmas so long as they are well characterized in terms of temperature and density. In turn, these measurements will allow tests of the validity of existing theoretical models.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Agence Nationale de la Recherche (ANR); European Union (EU); Ministry of Education and Science of the Russian Federation; European Regional Development Fund; Sapienza; LULI-Ecole Polytechnique

Grant/Contract Number:: AC52-07NA27344; AC02-76SF00515; 11-IDEX-0004-02; ANR-17-CE30-0026-Pinnacle; 633053; 654148 Laserlab-Europe Laserlab-Europe; 14.Z50.31.0007; C26A15YTMA; 654148

OSTI ID:: 1619584

Alternate ID(s):: OSTI ID: 1490669; OSTI ID: 1623335

Report Number(s):: LLNL-JRNL-810388; 14586; PII: 32726

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 8 Journal Issue: 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 11 works

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