2024 Workshop on Polarized Sources, Targets, and Polarimetry

Session

Polarized Electron Sources IV

Sep 27, 2024, 3:50 PM

Cebaf Center Auditorium (Jefferson Lab)

Conveners

Polarized Electron Sources IV

• Eric Voutier (Université Paris-Saclay - CNRS/IN2P3/IJCLab)

47. Practical Considerations when Using Low Carbon Steel for Extreme High Vacuum Applications

Aiman Al-Allaq (Jefferson Lab)

9/27/24, 3:50 PM

The very low outgassing rate of low-carbon steel – of the order 1000 times smaller than degassed stainless steel - suggests this material could provide the means to routinely achieve significantly better vacuum, well into the extreme high vacuum range. At Jefferson Lab, low carbon steel will be used for the construction of a new spin-polarized electron source. The improved vacuum we expect...

77. Preparation of MOCVD-grown Photocathodes containing a Strained GaAs/GaAsP Superlattice

Greg Blume (Old Dominion University)

9/27/24, 4:10 PM

In this work, we investigate multiple heat cleaning options for MOCVD-grown photocathodes containing a distributed Bragg reflector and a strained GaAs/GaAsP superlattice. This was done using a microMott polarimeter[1] at Jefferson Lab to optimize both quantum efficiency and polarization. Polarized photocathodes are essential to perform the physics programs planned at Jefferson Lab and...

49. Polarized positrons at Ce+BAF

Andriy Ushakov (JLab)

9/27/24, 4:30 PM

A baseline concept for a continuous wave (CW) polarized positron injector was developed for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (Ce+BAF) [1]. This concept is based on positron beam generation by a high current polarized electron beam (1 mA, 120 MeV, >85% polarization) irradiating a 4 mm thick rotating water-cooled tungsten target or liquid metal target....

101. Liquid metal-based polarized positron generation benchmark using the GEANT4 toolkit (via Zoom)

Victor Manuel Lizarraga-Rubio (Universidad de Guanajuato)

9/27/24, 4:50 PM

In this work, we report simulation results for the positron yield and polarization of polarized electron beams incident on GaInSn and PbBi liquid metal targets. One of the proposed upgrades to 12 GeV CEBAF is the use of a continuous wave polarized positron beam for physics experiments. Because of their heat dissipation capabilities, high-Z liquid metal jets are excellent candidates for...