TY - JOUR
T1 - Proton beam defocusing in AWAKE: comparison of simulations and measurements
AU - AWAKE Collaboration
AU - Davut, Can
AU - Liang, L.
AU - Williamson, Barney
AU - Xia, Guoxing
PY - 2020/10/19
Y1 - 2020/10/19
N2 - In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron (SPS) at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which agrees with simulations by the two-dimensional (axisymmetric) particle-in-cell code LCODE to about 5%. The agreement is achieved in beam population scans at two selected plasma densities and in the scan of longitudinal plasma density gradient. The agreement is reached only in the case of a wide enough simulation box (several plasma wavelengths) that is closer to experimental conditions, but requires more computational power. Therefore, particle-in-cell codes can be used to interpret the SSM physics underlying experimental data on SSM.
AB - In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron (SPS) at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which agrees with simulations by the two-dimensional (axisymmetric) particle-in-cell code LCODE to about 5%. The agreement is achieved in beam population scans at two selected plasma densities and in the scan of longitudinal plasma density gradient. The agreement is reached only in the case of a wide enough simulation box (several plasma wavelengths) that is closer to experimental conditions, but requires more computational power. Therefore, particle-in-cell codes can be used to interpret the SSM physics underlying experimental data on SSM.
UR - https://www.scopus.com/pages/publications/85131223035
U2 - 10.1088/1361-6587/abc298
DO - 10.1088/1361-6587/abc298
M3 - Article
SN - 0741-3335
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
ER -