Erlangen 2026 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hadron Structure and Spectroscopy I

HK 2.5: Vortrag

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

Beam rastering system for P2 collaboration at MESA — •Sumedh Kulkarni and Tyler Kutz for the P2 collaboration — KPH, Johannes Gutenberg University of Mainz

The P2 collaboration at the MESA facility aims for a high precision measurement of the parity violating asymmetry in the elastic scattering of polarized electrons off of unpolarized protons. The expected asymmetry is on the order of 40 parts per billion (ppb), with a precision goal of better than 1 ppb. Thus, the experiment requires very high event rates to achieve the necessary statistical precision. Achieving such rates demands an intense, continuous electron beam incident on a thick target. P2 will carry out the measurement with a 150 µA electron beam on a 60 cm liquid hydrogen target. The resulting large power deposition can damage or destabilize the target without proper precautions. One way to mitigate this risk is to raster the electron beam with fast steering magnets, in order to distribute the power over a larger area of the target. For this, P2 will develop a rastering system that uses two electromagnetic dipoles to steer the electron beam by the desired angle. We used computer simulation to optimize ferrite yoke geometries and to determine the coil specifications for the required magnetic field strength. From these simulations, the most suitable yoke design and coil specifications were chosen. Here we present results of these simulations and further construction steps of the rastering system for the P2 experiment at MESA.

Keywords: MESA; P2 Collaboration; Beam rastering; Steering magnets