July 19, 2017 - Group Meeting

Musts

1) CEBAF beam studies at high current, including DBR photocathode, and installation and testing of Brock's resonant polarimeter.

- High current studies w/ SLSP-5756-4

- Gun2 Exchange

RETAIN
* Puck #9 SLSP-5756-4 in HV chamber, provides good QE>1% and high ~86% polarization (MeV Mott)
* Puck #3 SLSP-5247-4 in PREP, sibling of the workhouse high polarization ~90% reported by QWeak
REMOVE
* Puck #10 SLSP-75102 - diffracted Bragg reflector photocathode from wafer 75102
* Puck #11 SLSP-1146-4 - received a GaAsSb/AlGaAsP superlattice photocathode 1146-4
INSTALL
* Puck #6 75104 Non-DBR
* Puck #8 75105-DBR (crack)
* Puck #2x (new) 75105-DBR (back-up yet to mount)

- Resonant polarimeter ATLIS

2) Other SAD activities and preparing for CEBAF operations

Link to CEBAF Whiteboard
* 4-Laser (co-alignment, PPLN lens, 5-axis mount, linear size adjustment) 
* 4-LLRF (production chassis, Flip-FSD, BPM receiver electronics for 250MHz IN/OUT phase)
* 4-Beam setup
* Open Gun3 valve

3) Recap what we decided to do regarding the installation of 200kV gun at CEBAF (i.e., delayed installation until next SAD)

4) Brief discussion of next SAD: ordering new glassman and stuff, designing the new baked beamline, 200kV Wien plans, and scheduling the Bubble Chamber exp.

5) UITF: making beam this summer? summer is half over. Other UITF business

6) GTS R&D: magnetized beam update, emittance confusion - are we clearing this up? Yan's thesis data, plans for 5mA operation, precipitator tests? planned installation of modelocked laser, the gain switched diode and fiber amplifier?

Shoulds

1) cryopumped vacuum study

2) vortex beams with miniMott

3) testing brock cavity as "kicker"

4) It does NOT seem like the NASA run will happen at LERF