TY - JOUR

T1 - Uniform onset of the long proton bunch self-modulation seeded by an electron bunch in an overdense plasma

AU - Moon, K.

AU - Yoon, E. S.

AU - Chung, M.

AU - Muggli, P.

AU - Moreira, M.

AU - Baistrukov, M. A.

N1 - This work was supported by the National Research Foundation of Korea (Grants No. NRF-2016R1A5A1013277, No. NRF-2020R1A2C1010835, and No. RS-2022-00154676).

PY - 2023

Y1 - 2023

N2 - The phase, growth rate, and onset of long proton bunch self-modulation in plasma can be controlled by a preceding short charged particle bunch. In this paper, by analyzing the growth rates of the self-modulation obtained from particle-in-cell simulation results, we identify two modes of self-modulation, namely noise-seeded and externally seeded self-modulations, and investigate their onset timings. We find that a uniform onset of the self-modulation at each slice of the long proton bunch is crucial for fine-tuning its phase and amplitude. We then demonstrate that a low-energy and low-current electron seed bunch in overdense plasma generates near-axis radial wakefields similar to those observed in the blowout regime. Consequently, the resultant self-modulation is excited as a single mode simultaneously along the entire long proton bunch.

AB - The phase, growth rate, and onset of long proton bunch self-modulation in plasma can be controlled by a preceding short charged particle bunch. In this paper, by analyzing the growth rates of the self-modulation obtained from particle-in-cell simulation results, we identify two modes of self-modulation, namely noise-seeded and externally seeded self-modulations, and investigate their onset timings. We find that a uniform onset of the self-modulation at each slice of the long proton bunch is crucial for fine-tuning its phase and amplitude. We then demonstrate that a low-energy and low-current electron seed bunch in overdense plasma generates near-axis radial wakefields similar to those observed in the blowout regime. Consequently, the resultant self-modulation is excited as a single mode simultaneously along the entire long proton bunch.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85178271448&origin=inward&txGid=ecb6bd32e8524f8bc6dac62acc42a2a5

UR - https://www.mendeley.com/catalogue/fbf99dc2-b3c9-3f50-b458-f84551baefc2/

U2 - 10.1103/physrevaccelbeams.26.111301

DO - 10.1103/physrevaccelbeams.26.111301

M3 - Article

VL - 26

JO - Physical Review Accelerators and Beams

JF - Physical Review Accelerators and Beams

SN - 2469-9888

IS - 11

M1 - 111301

ER -