Electron beam characterization with beam loss monitors in AWAKE

Abstract

We present a method to measure transverse size and position of an electron or proton beam, close to the injection point in plasma wakefields, where other diagnostics are not available. We show that transverse size measurements are in agreement with values expected from the beam optics with a $<10\%$ uncertainty. We confirm the deflection of the low-energy 18 MeV electron beam trajectory by the Earth's magnetic field. This measurement can be used to correct for this effect and set proper electron bunch injection parameters. The advanced wakefield experiment at CERN (AWAKE) relies on these measurements for optimizing electron injection.

References in corpus (5)

• Acceleration of electrons in the plasma wakefield of a proton bunch
• AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN
• Experimental observation of proton bunch modulation in a plasma, at varying plasma densities
• Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch
• AWAKE readiness for the study of the seeded self-modulation of a 400\,GeV proton bunch