Speaker
Description
AWAKE uses a long relativistic proton bunch (400 GeV, 48 nC) to drive wakefields in plasma. The amplitude of the wakefields increases along the plasma as the bunch undergoes self-modulation (SM). Wakefields are energy deposited in the plasma that must dissipate, a fraction of which is emitted as light. We measure the amount of light emitted to study the development of the wakefield amplitude along the plasma. We present experimental results that show: growth and saturation of SM along the plasma; differences in development of SM depending on the charge of the drive bunch and the plasma density; differences when SM is seeded (SSM) or developing as an instability (SMI). These observations are also confirmed by other diagnostics. However, this is the only diagnostic with multiple measurement points along the plasma, enabling observation of the SM process as it develops.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Rejected. |
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