Positron Working Group Workshop

Session

PWG - 1

Mar 18, 2024, 9:00 AM

B1270 (Science and Engineering Hall)

Conveners

PWG - 1

• Douglas Higinbotham (Jefferson Lab)

1. Welcome

Axel Schmidt (George Washington University)

3/18/24, 9:00 AM

2. Workshop charge

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

3/18/24, 9:05 AM

7. Ce$^+$BAF R&D plan

Joe Grames (JLab)

3/18/24, 9:15 AM

In this presentation I will review the baseline design for Ce$^+$BAF and explain the R&D Plan for the next few years.

3. A high intensity polarized beam photogun for the Ce+BAF positron source

Carlos Hernandez-Garcia (Thomas Jefferson National Accelerator Facility)

3/18/24, 9:45 AM

A photogun to generate high intensity, high polarization electron beam with unprecedented kC lifetime is being developed at JLab. The proposed Ce+BAF polarized positron source will require > 1 milliampere CW with > 90% polarization electron beam at 120 MeV. To be practical for a user program, a photogun operating at 1 milliampere should deliver ~ 2 kC high polarization beam for a month without...

4. Ce$^+$BAF target update

Silviu Covrig Dusa (Jefferson Lab)

3/18/24, 10:45 AM

I will give an update about the positron target effort at Jefferson Lab.

5. A high-power positron converter based on a recirculated liquid metal in-vacuum target

Vaclav Kostroun (Xelera Research LLC)

3/18/24, 11:15 AM

The very large power in electron beams needed to generate positrons and the accompanying enormous power densities preclude solid targets unless some complicated means of heat removal is implemented (e.g., cooled high-speed target rotation). A promising alternative is to use a windowless target and a liquid metal converter. Two liquid metals that have desirable properties for such a converter...

6. Simulations of positron beam generation and capture at Ce+BAF

Andriy Ushakov (JLab)

3/18/24, 11:45 AM

The concept of generation and capture of polarized positron beams for the CEBAF upgrade is presented. In order to provide the highly polarized positron beam and the high current low polarized positron beam for nuclear physics experiments, the positron source requires a flexible capture system with an adjustable energy selection band. The simulation results of the positron beam generation in a...