Electron bunch seeded proton bunch modulation KookJin Moon

Electron bunch seeded proton bunch modulation Kook-Jin Moon BE-ABP-LAT Section Meeting 12 February 2020

Need for electron beam seeding 1 RUN 1 scheme • The phase of ionization laser is set to the middle of proton bunch. • Only back half of the proton bunch interact with plasma at the selfmodulator • At the accelerator, front half of the proton bunch can suffer from selfmodulation instability with uncontrolled phase of wakefield. Kook-Jin Moon, UNIST Self-modulator (ionized at the middle of proton bunch) BE-ABP-LAT Section Meeting, 12 February 2020 Accelerator (pre-ionized) 2

Need for electron beam seeding 2 RUN 2 scheme • The phase of ionization laser is ahead of the proton bunch. • The entire proton bunch particles interact with plasma. • The phase of selfmodulated proton bunch is determined only at the self-modulator. Self-modulator (preionized) Kook-Jin Moon, UNIST BE-ABP-LAT Section Meeting, 12 February 2020 Accelerator (preionized) 3

Electron bunch seeded proton bunch modulation • The transverse wakefield driven by the preceding electron bunch modulates the proton bunch. • Now the seed wakefield for the proton bunch modulation is decoupled from the proton bunch. Self-modulated proton bunch Kook-Jin Moon, UNIST Seed electron bunch • Numerical studies using PIC codes (LCODE, QV 3 D) are ongoing to understand the electron bunch seeded proton bunch self-modulation and investigate the optimum parameters for RUN 2 experiment. BE-ABP-LAT Section Meeting, 12 February 2020 4

Thank you!