19–24 May 2024
Music City Center
US/Central timezone

Toward a long-lifetime polarized photoelectron gun for the Ce+BAF positron source

MOPC52
20 May 2024, 16:00
2h
Country (MCC Exhibit Hall A)

Country

MCC Exhibit Hall A

Poster Presentation MC1.A08 Linear Accelerators Monday Poster Session

Speaker

Max Bruker (Thomas Jefferson National Accelerator Facility)

Description

The addition of spin-polarized, continuous-wave (c.w.) positron beams to the 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) would provide a significant capability to the experimental nuclear physics program at Jefferson Lab. Based on bremsstrahlung and pair-production in a high-Z target, the positron source requires a 120 MeV spin-polarized c.w. electron beam of several milliamperes. While the beam dynamics of the high-current electron beam are tenable, sustaining this current for weeks of user operations requires an unprecedented charge lifetime from a high-polarization GaAs-based photocathode. A promising approach to exceed the kilocoulomb charge lifetime barrier is reducing the ion back-bombardment fluence at the photocathode. By increasing the laser size and managing the emittance growth with an adequate cathode/anode design, significantly enhanced charge lifetime may be achieved. Based upon a new simulation model that qualitatively explains the lifetime data previously measured at different spot sizes, we describe the practical implications on the parameter space available for a kilocoulomb-lifetime polarized photogun design.

Funding Agency

Work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.

Region represented North America
Paper preparation format LaTeX

Primary author

Max Bruker (Thomas Jefferson National Accelerator Facility)

Co-authors

Alicia Hofler (Thomas Jefferson National Accelerator Facility) Carlos Hernandez-Garcia (Thomas Jefferson National Accelerator Facility) Gabriel Palacios Serrano (Thomas Jefferson National Accelerator Facility) Dr Joseph Grames (Thomas Jefferson National Accelerator Facility)

Presentation materials

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