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Title: Phase locked multiple rings in the radiation pressure ion acceleration process

Abstract

Laser contrast plays a crucial role for obtaining high quality ion beams in the radiation pressure ion acceleration (RPA) process. Through one- and two-dimensional particle-in-cell (PIC) simulations, we show that a plasma with a bi-peak density profile can be produced from a thin foil on the effects of a picosecond prepulse, and it can then lead to distinctive modulations in the ion phase space (phase locked double rings) when the main pulse interacts with the target. These fascinating ion dynamics are mainly due to the trapping effect from the ponderomotive potential well of a formed moving standing wave (i.e. the interference between the incoming pulse and the pulse reflected by a slowly moving surface) at nodes, quite different from the standard RPA process. Here, a theoretical model is derived to explain the underlying mechanism, and good agreements have been achieved with PIC simulations.

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [3];  [4];  [3];  [3]
  1. Tsinghua Univ., Beijing (People's Republic of China); Weizmann Institute of Science, Rehovot (Israel)
  2. Tsinghua Univ., Beijing (People's Republic of China)
  3. Univ. of California Los Angeles, Los Angeles, CA (United States)
  4. Univ. of California Los Angeles, Los Angeles, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1436108
Grant/Contract Number:  
AC02-76SF00515; ACI-1339893; PHY-1415386; PHY-500630; SC0008316; SC0008491; SC0010064; SC0014260; 11425521; 11475101; 11535006; 11775125
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; picosecond prepulse; phase locked multiple rings; standing wave; radiation pressure acceleration

Citation Formats

Wan, Y., Hua, J. F., Pai, C. -H., Li, F., Wu, Y. P., Lu, W., Zhang, C. J., Xu, X. L., Joshi, C., and Mori, W. B. Phase locked multiple rings in the radiation pressure ion acceleration process. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaae36.
Wan, Y., Hua, J. F., Pai, C. -H., Li, F., Wu, Y. P., Lu, W., Zhang, C. J., Xu, X. L., Joshi, C., & Mori, W. B. Phase locked multiple rings in the radiation pressure ion acceleration process. United States. doi:10.1088/1361-6587/aaae36.
Wan, Y., Hua, J. F., Pai, C. -H., Li, F., Wu, Y. P., Lu, W., Zhang, C. J., Xu, X. L., Joshi, C., and Mori, W. B. Mon . "Phase locked multiple rings in the radiation pressure ion acceleration process". United States. doi:10.1088/1361-6587/aaae36. https://www.osti.gov/servlets/purl/1436108.
@article{osti_1436108,
title = {Phase locked multiple rings in the radiation pressure ion acceleration process},
author = {Wan, Y. and Hua, J. F. and Pai, C. -H. and Li, F. and Wu, Y. P. and Lu, W. and Zhang, C. J. and Xu, X. L. and Joshi, C. and Mori, W. B.},
abstractNote = {Laser contrast plays a crucial role for obtaining high quality ion beams in the radiation pressure ion acceleration (RPA) process. Through one- and two-dimensional particle-in-cell (PIC) simulations, we show that a plasma with a bi-peak density profile can be produced from a thin foil on the effects of a picosecond prepulse, and it can then lead to distinctive modulations in the ion phase space (phase locked double rings) when the main pulse interacts with the target. These fascinating ion dynamics are mainly due to the trapping effect from the ponderomotive potential well of a formed moving standing wave (i.e. the interference between the incoming pulse and the pulse reflected by a slowly moving surface) at nodes, quite different from the standard RPA process. Here, a theoretical model is derived to explain the underlying mechanism, and good agreements have been achieved with PIC simulations.},
doi = {10.1088/1361-6587/aaae36},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2018},
month = {3}
}

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Figures / Tables:

Figure 1 Figure 1: (a) The basic setup of a 1D PIC simulation. In this simulation, a 180 nm thick foil is first irradiated by a CP prepulse of normalized peak amplitude a1 = 0.05 and temporal Gaussian profile (the FWHM duration $\tau$1 = 1 ps), and then interacts with a followingmore » main pulse of a2 = 5 and $\tau$2 = 100 fs after 3.5 ps delay. The foil is pure hydrogen plasma and has an initial density of no = 10nc. (b) The ion density distribution ni at t = 0 (black dashed), and at a time of t= 4.4 ps (blue solid) slightly before the main pulse arrives. (c) The ion (z - Pz) phase space at t = 2 ps when the prepulse is almost over. In (b) and (c), accelerated ions are divided into three parts as shown using boxes of three different colors. (d) The ion (z - Pz) phase space at the time of t = 4 .5 ps. (e) The distribution of electron density ne (red solid line) and laser electric field Ey (black solid line) when the main pulse interacts with the shaped target. The black dashed line in (e) represents Ey = 0.« less

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    Works referencing / citing this record:

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    journal, July 2018

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.