DOE OSTI · 3363593
Positron Injector for Ce+BAF
Abstract
A baseline concept for a continuous wave (CW) polarized positron injector was developed for the CEBAF at Jefferson Lab. This concept is based on the generation of CW longitudinally polarized positrons by a high-current, polarized electron beam 1 mA, 130-370 MeV, and 90% longitudinal polarization that passes through a rotating, water-cooled, tungsten target. The simulations for the Ce+BAF injector at the Low Energy Recirculator Facility (LERF) are performed, including positron beam generation, capture, energy selection, and acceleration to 123 MeV. The positron yield (or positron current) and longitudinal polarization are calculated considering the longitudinal and transverse CEBAF acceptances (<1% energy spread, 1.2 mm bunch length and normalized emittance of 100 mm·mrad). The impact of target thickness, electron beam energy, and transverse size on positron yield within the required emittance limit is evaluated. Target thermal and structural FEM analyses (ANSYS Fluent) are performed to determine the maximum electron beam current and minimum transverse beam size on the target.
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Benesch, Jay [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Bogacz, A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Bruker, M. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Covrig Dusa, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Gopinath, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Grames, J. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Gubeli, J. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Hernandez-Garcia, C. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Lizárraga-Rubio, V. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Ogur, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Raut, N. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Rimmer, R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Roblin, Y. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Turner, D. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Ushakov, A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Voutier, E. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Wang, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Zahangir, A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]. 2026-03-23. Positron Injector for Ce+BAF. https://doi.org/10.2172/3363593
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