Erlangen 2026 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation VIII

HK 44.5: Vortrag

Donnerstag, 19. März 2026, 17:15–17:30, PHIL A 301

Design of the liquid hydrogen target for the P2 parity violating experiment at MESA — Sebastian Baunack¹, Maarten Bonnekamp^2,4, Boris Gläser¹, Shruti Gudla¹, Rahima Krini¹, Frank Maas^1,2,3, •Jayanta Naik¹, Moran Neher¹, Tobias Rimke¹, Paul Schöner², Siddharth Thakker¹, 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 — ⁴IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France

The P2 experiment aims to precisely measure the weak mixing angle sin²θ_W through parity-violating electron-proton scattering at low momentum transfer. This is projected to achieve a relative precision of 0.16% for sin²θ_W. To achieve this precision, there is a need for a target design that will have small false asymmetry due to aluminum windows and the conical diverter. The liquid hydrogen target is 60 cm long, along with a potential helium cell positioned upstream of the primary hydrogen cell.

In this talk, the design of the target cell is explained, which includes the simulation results for the aluminum upstream and downstream windows, helium cell, and the conical flow diverter.

Keywords: P2; MESA; Simulation