Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation XI

HK 47.4: Talk

Wednesday, March 30, 2022, 16:45–17:00, HK-H3

Design of a luminosity monitor for the P2 parity violating experiment at MESA — Sebastian Baunack¹, Boris Gläser¹, Kathrin Imai¹, Rahima Krini¹, Frank Maas^1,2,3, •Tobias Rimke¹, David Rodriguez Pineiro², and Malte Wilfert¹ for the P2 collaboration — ¹Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — ²Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz — ³PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz

The P2 experiment at the future MESA accelerator in Mainz plans to measure the weak mixing angle sin²(θ_W) in parity violating elastic electron-proton scattering. The aim of the experiment is a very precise measurement of the weak mixing angle with a accuracy of 0.15% at a low four-momentum transfer of Q²=4.5· 10⁻³ GeV². In order to achieve this accuracy, it is necessary to monitor the stability of the electron beam and the liquid hydrogen target. Any helicity correlated fluctuations of the target density lead to false asymmetries.

Therefore, it is planned to install a luminosity monitor in forward direction close to the beam axis. The motivation and challenges for designing an air Cherenkov luminosity monitor will be discussed in this talk.