MESA
MESA will be operated at a significantly lower electron beam energy compared to MAMI, but with an order of magnitude higher beam intensity of more than 1 mA. This will be possible thanks to the innovative concept of energy-recovery (ERL). MESA will run in two operational modes: (i) the ERL mode, in which the MAGIX high-resolution spectrometer setup will be served by the accelerator, and (ii) the extracted beam mode, in which the P2 experiment.
The P2 experiment is a magnetic spectrometer with the main goal to measure the electroweak mixing angle at very low momentum transfer, which becomes accessible by measuring a parity-violating left-right asymmetry in elastic electron-proton scattering.
The MAGIX experiment (MAinz Gas-Internal Target Experiment) will consist of two magnetic spectrometers with a relative momentum resolution of order $10^{−4}$, provided a spatial resolution in the focal plane of the spectrometers of 100~$\mu m$ is achieved. MAGIX will operate in beam-dump mode with solid targets and in ERL mode with a windowless internal gas-jet target.