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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation I

HK 8.6: Vortrag

Montag, 16. März 2026, 17:45–18:00, PHIL A 301

Magnetic-field mapping requirements and strategy 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 at the upcoming MESA accelerator aims to perform a high-precision determination of the weak mixing angle by measuring the parity-violating asymmetry in elastic electron-proton scattering at low momentum transfer (Q² ≈ 4.5 × 10⁻³ GeV²). To reach the targeted uncertainty, the experiment relies on a solenoid-based spectrometer providing full 2π azimuthal acceptance and controlled transport of scattered electrons to the integrating Cherenkov detector system. Precise knowledge of the magnetic field distribution inside the solenoid is essential for Q² reconstruction, systematic-uncertainty control, and background separation. Therefore, a dedicated magnetic-field mapping approach is planned to characterize the 3D field response under operating conditions. The talk will outline requirements of mapping a high-current, large-aperture solenoid and discuss strategies for establishing a validated magnetic-field model for the P2 spectrometer.

Keywords: P2; MESA; Superconducting solenoid; Magnetic Field Mapping