Speaker
Description
We are designing a high-charge, high-polarization preinjector for the EIC. Employing a Wien filter as the spin rotator immediately after the gun offers multiple advantages over the traditional dipole–solenoid spin rotator placed after the linac. However, this represents the first attempt to operate a Wien filter in a strong–space-charge environment. The energy spread and space-charge forces may influence spin dynamics.
We analytical studied investigates space-charge effects on electron-beam polarization across the low-energy region, from the polarized electron gun to the linac entrance. We analyze spin degradation in the gun-to–Wien filter interface, within the Wien filter itself, and in the bunching section. A comprehensive evaluation of polarization-degradation mechanisms under space-charge conditions is presented.
We further perform spin tracking through the full low-energy beamline using the space charging with spin tracking code General Particle Tracer (GPT) to validate the analytical model and incorporate higher-order effects.
Funding Agency
Work is supported by Brookhaven Science Associates, LLC under DE-SC0012704 with the U.S. Department of Energy.
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