Abstract
We briefly describe the basic physics principles considered for planning of the AWAKE Run 2 experiment. These principles are based on experimental results obtained during Run 1 and knowledge obtained from numerical simulation results and other experiments. The goal of Run 2 is to accelerate an electron bunch with a narrow relative energy spread and an emittance sufficiently low for applications. The experiment will use two plasmas, electron bunch seeding for the SM process, on-axis external injection of an electron bunch and electron bunch parameters to reach plasma blow-out, beam loading and beam matching.
Highlights
Relativistic proton bunches produced by the CERN SPS (400 GeV) or LHC (6.5 TeV) carry large amounts of energy (19 and 104 kJ, respectively) and are potential drivers of wakefields over long plasma length
We briefly describe the basic physics principles considered for planning of the AWAKE Run 2 experiment
These principles are based on experimental results obtained during Run 1 and knowledge obtained from numerical simulation results and other experiments
Summary
Relativistic proton bunches produced by the CERN SPS (400 GeV) or LHC (6.5 TeV) carry large amounts of energy (19 and 104 kJ, respectively) and are potential drivers of wakefields over long plasma length. Injected electrons could be accelerated and reach the 100s of GeV to TeV energy level These bunches are long (∼(6-12) cm) and require self-modulation [1] (SM) to effectively drive large amplitude wakefields (∼1 GV/m). AWAKE Run 1 results very successfully met the goal that were set forward: demonstration of the SM of the SPS proton bunch in the 10 m plasma [4, 5] and acceleration of externally injected, 18 MeV electrons to the GeV energy level [6]. The plans for Run 2 are based on the results of Run and on the goal to accelerate a particle bunch with a narrow relative energy spread and an emittance sufficiently low for applications high-energy physics applications ((10-20) mm-mrad)
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