Primary Beam Steering Due to Field Leakage from Superconducting SHMS Magnets

TL;DR

This paper investigates magnetic field leakage from superconducting magnets in a spectrometer, demonstrating how it affects beam steering and proposing an optimized shielding solution to mitigate this issue.

Contribution

It provides detailed magnetic field simulations and introduces an optimal shielding placement method to reduce beam steering caused by field leakage.

Findings

Significant magnetic field leakage affects beam trajectory.

Optimal shielding placement effectively mitigates beam steering.

Simulations confirm the effectiveness of the proposed shielding solution.

Abstract

Simulations of the magnetic fields from the Super High Momentum Spectrometer in Hall C at Thomas Jefferson National Accelerator Facility show significant field leakage into the region of the primary beam line between the target and the beam dump. Without mitigation, these remnant fields will steer the unscattered beam enough to limit beam operations at small scattering angles. Presented here are magnetic field simulations of the spectrometer magnets and a solution using optimal placement of a minimal amount of shielding iron around the beam line.