Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-24T18:40:41.662Z Has data issue: false hasContentIssue false
  • English
  • Français

Influence of the solenoid magnetic field on the self-modulation mechanism

Published online by Cambridge University Press:  18 May 2020

Xiao-ying Zhao ,
Yang-yang Yang ,
Huan Jia ,
Zai-peng Xie ,
Xin Qi Open the ORCID record for Xin Qi [Opens in a new window] ,
Zhi-jun Wang  and
Yuan He
Xiao-ying Zhao
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China
Yang-yang Yang
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing100049, China
Huan Jia
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing100049, China
Zai-peng Xie
Affiliation:
Department of computer science and technology, Hohai University, Nanjing210098, China
Xin Qi*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing100049, China
Zhi-jun Wang*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing100049, China
Yuan He
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing100049, China
*
Authors for correspondence: X. Qi, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China. E-mail: qixin2002@impcas.ac.cn; Z. Wang, Institute of Modern Physics, Chiese Academy of Sciences, Lanzhou730000, China. E-mail: wangzj@impcas.ac
Authors for correspondence: X. Qi, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, China. E-mail: qixin2002@impcas.ac.cn; Z. Wang, Institute of Modern Physics, Chiese Academy of Sciences, Lanzhou730000, China. E-mail: wangzj@impcas.ac
Get access Rights & Permissions [Opens in a new window]

Abstract

For the guarantee of the long-distance transport of the bunches of China Initiative Accelerator Driven System (CIADS), a new scheme is proposed that extra magnetic field is used in the accelerator-target coupling section before the windowless target to minimize the self-modulation (SM) mechanism. Particle-in-cell simulations are carried out to study the influence of the solenoidal magnetic field on the self-modulation mechanism when long proton bunches move in the background plasmas. The long proton bunches used in the simulations are similar to these in the linear accelerator of CIADS. It is found that the presence of the solenoidal magnetic field will significantly inhibit the self-modulation process. For the strong magnetic field, the longitudinal separation and transverse focusing of the long bunches disappear. We attribute these phenomena to the reason that the strong solenoidal magnetic field restricts the transverse movement of plasma electrons. Thus, there are not enough electrons around the bunch to compensate the space charge effect. Moreover, without transverse current, the longitudinal pinched effect disappears, and the long bunch can not be separated into small pulses anymore.

Keywords

Particle beamsparticle-in-cell simulationplasma acceleratorself-modulation mechanismwakefield
Type
Research Article
Information
Laser and Particle Beams , Volume 38 , Issue 2 , June 2020 , pp. 135 - 140
Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dorf, MA, Kaganovich, ID, Startsev, EA and Davidson, RC (2009) Enhanced self-focusing of an ion beam pulse propagating through a background plasma along a solenoidal magnetic field. Physical Review Letters 103, 075003.CrossRefGoogle ScholarPubMed
Hu, Z, Chen, M and Wang, Y (2014) Current neutralization and plasma polarization for intense ion beams propagating through magnetized background plasmas in a two-dimensional slab approximation. Frontiers of Physics 9, 226.CrossRefGoogle Scholar
Kaganovich, ID, Shvets, G, Startsev, E and Davidson, RC (2001) Nonlinear charge and current neutralization of an ion beam pulse in a pre-formed plasma. Physics of Plasmas 8, 4180.CrossRefGoogle Scholar
Kaganovich, ID, Startsev, EA and Davidson, RC (2004) Nonlinear plasma waves excitation by intense ion beams in background plasma. Physics of Plasmas 11, 3546–3552.CrossRefGoogle Scholar
Kaganovich, ID, Startsev, EA, Sefkow, AB and Davidson, RC (2007) Charge and current neutralization of an ion-beam pulse propagating in a background plasma along a solenoidal magnetic field. Physical Review Letters 99, 235002.CrossRefGoogle Scholar
Kumar, N, Pukhov, A and Lotov, K (2010) Self-modulation instability of a long proton bunch in plasmas. Physical Review Letters 104, 255003.CrossRefGoogle ScholarPubMed
Lotov, KV (2015) Physics of beam self-modulation in plasma wakefield accelerators. Physics of Plasmas 22, 103110.CrossRefGoogle Scholar
Nieter, C and Cary, JR (2004) VORPAL: a versatile plasma simulation code. Journal of Computational Physics 196, 448.CrossRefGoogle Scholar
Polomarov, O, Sefkow, AB, Kaganovich, I and Shvets, G (2007) Computationally efficient description of relativistic electron beam transport in collisionless plasma. Physics of Plasmas 14, 043103.CrossRefGoogle Scholar
Sefkow, AB, Davidson, RC, Gilson, EP, Kaganovich, ID, Anders, A, Coleman, JE, Leitner, M, Lidia, SM, Roy, PK, Seidl, PA, Waldron, WL, Yu, SS and Welch, DR (2009) Simulations and experiments of intense ion beam current density compression in space and time. Physics of Plasmas 16, 056701.CrossRefGoogle Scholar
Seidl, PA, Anders, A, Bieniosek, FM, Barnard, JJ, Calanog, J, Chen, AX, Cohen, RH, Coleman, JE, Dorf, M, Gilson, EP, Grote, DP, Jung, JY, Leitner, M, Lidia, SM, Logan, BG, Ni, P, Roy, PK, Van den Bogert, K, Waldron, WL and Welch, DR (2009) Progress in beam focusing and compression for warm-dense matter experiments. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 606, 75–82.CrossRefGoogle Scholar
Yang, L and Zhan, W (2015) New concept for ADS spallation target: gravity-driven dense granular flow target. Science China Technological Sciences 58, 1705–1711.CrossRefGoogle Scholar