Abstract
The Mainz Energy-recovering Superconducting Accelerator (MESA) will be an electron accelerator allowing operation in energy-recovery linac (ERL) mode. It provides the opportunity to operate scattering experiments at energies of ~ 100 MeV with thin gas-targets. The MESA Internal Gas Target Experiment (MAGIX) aims to operate windowless jet targets and different gases up to Xenon to search for possible dark photon interactions, to precisely measure the magnetic proton radius and astrophysical S-factors. Investigations on the impact of the target on beam dynamics and beam losses are required for machine safety and to examine limits to ERL operation. The goal of this work is to understand target induced halo in the different experimental setups, track halo particles through downstream sections to examine beam losses and include a suitable collimation system and shielding into the accelerator layout to protect the machine from direct and indirect damage through beam losses and radiation. The present status of the investigations is presented.
Highlights
The Mainz Energy-recovering Superconducting Accelerator (MESA) Internal Gas Target Experiment (MAGIX) aims to operate windowless jet targets and different gases up to Xenon to search for possible dark photon interactions, to precisely measure the magnetic proton radius and astrophysical S-factors
Target Induced Halo (TAIL) Operating at the MESA beam current of > 1 mA, MAGIX will achieve a luminosity L ∼ 1035 cm−2 s−1 which will allow a wide range of experiments
Detailed halo particle distributions are generated with Geant4, tracked downstream with BDSIM and reveal severe effects of distorted beam from beam-target interaction on beam losses
Summary
The simulations presented below take the actual conditions into account They indicate that for the mentioned effective luminosity, losses of several Watts are expected until the first decelerating cryomodule. This is only ∼ 10−4 of the total beam intensity of 105 kW at the target or 2 × 10−3 of the beam power after energy recovery PRec = 5 kW. The beam-target scattering at MESA is simulated in Geant4[8] to extract transverse and longitudinal halo as presented in [3], the outcoming beam is tracked downstream in BDSIM[9] to obtain beam losses and their locations in the accelerator.
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