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

Abstract

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 ofmore » 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.« less

Authors:
; ORCiD logo; ORCiD logo; ; ORCiD logo; ; ; ; ORCiD logo; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
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
OSTI Identifier:
1619584
Alternate Identifier(s):
OSTI ID: 1490669; OSTI ID: 1623335
Report Number(s):
LLNL-JRNL-810388
Journal ID: ISSN 2045-2322; 14586; PII: 32726
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
Resource Type:
Journal Article: Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 8 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Stopping Power; Short High Intensity Laser Pulses; Proton Beam; Titanate Laser; Average Excitation Energy

Citation Formats

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., and Fuchs, J. Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas. United Kingdom: N. p., 2018. Web. doi:10.1038/s41598-018-32726-2.
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. Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas. United Kingdom. https://doi.org/10.1038/s41598-018-32726-2
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., and Fuchs, J. 2018. "Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas". United Kingdom. https://doi.org/10.1038/s41598-018-32726-2.
@article{osti_1619584,
title = {Experimental evidence for the enhanced and reduced stopping regimes for protons propagating through hot plasmas},
author = {Chen, S. N. and Atzeni, S. and Gangolf, T. and Gauthier, M. and Higginson, D. P. and Hua, R. and Kim, J. and Mangia, F. and McGuffey, C. and Marquès, J. -R. and Riquier, R. and Pépin, H. and Shepherd, R. and Willi, O. and Beg, F. N. and Deutsch, C. and Fuchs, J.},
abstractNote = {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.},
doi = {10.1038/s41598-018-32726-2},
url = {https://www.osti.gov/biblio/1619584}, journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 8,
place = {United Kingdom},
year = {Mon Oct 01 00:00:00 EDT 2018},
month = {Mon Oct 01 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1038/s41598-018-32726-2

Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: Calculated stopping power for protons of energy E < 1 MeV in Hydrogen at density of 1 mg/cm3 and different temperatures (solid curves). The dashed curve refers to SRIM data for gaseous Hydrogen at room temperature.

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