November 14, 2018 - Group Meeting
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Fall 2018
- CEBAF Status
- Program through Christamas
- Tue 11/20 - Hall A turns off for rest of the year
- Mon 11/26 - Linac and Pass changes (ABCD = Off/4/2/5.5) => Wien change for B, D moves to the A-list to limit bleedthrough
- Mon 12/10 - Linac and Pass changes (ABCD = Off/4/3/5.5) => Wien change for B
- Thu 12/20 - Machine off at 8am for Holiday break
- Beam Studies and OnCall Activities
- Gun2 QE Gun2 lifetime and recent QE scan and Spot Move 11/15/18
- High Polarization in Hall B Hall B Moller and Beam Energy and Mott measurements
- SF6 Relief Valve SF6 relief valve leaky and On-Call Repair
- Easy Button Not So Easy Hall A Laser investigation and SCAM modification
- Vertical Wien Filter Current Instability Vertical Wien current instability addressed, but not fixed and Vertical Wien current instability resolved
- PQB Studies Low QE => Large Q Asym and Helicity board signal vs. setpoint
- Program through Christamas
- LERF Status
- GTS Status
- UITF Status
Forecast 2019
- JAN 2 - JAN 22 (3 week SAD/PSS period) SAD
- MUST
- Heat/Activate Gun2 Photocathode SLSP
- John ordered small tank to top off SF6
- Install RTP Pockels cell
- Fiducialize IHA2D00 for Bubble
- SHOULD
- Accelerator electricians to install two new racks + cable tray in ISB for 200KV Wien HVPS and address iocin6 load
- Implement 1kV anode safe floating bias supply inline with anode-picoammeter
- LIKE
- Restore/HCO helicity magnets?
- Install DBR?
- MUST
- FEB 1 - Arne's target date for LERF to be ready
- Good photocathode
- Gun reaches HV
- Laser/DLCP ready to go
- Let's work with Chris and Shaun to develop a plan to restore beam through QCM (will be 2K)
- No firm Radioisotope run dates yet
- JAN 30 - APR 7 (10 week run period)
- Similar to this run with A=30, B=polarized, C=50-70uA, D
- Hall A run short until MAR 7, then a 3 day PQB tests a 1-pass 70uA
- APR 8 - JUN 2 (8 week SAD period)
- PQB Studies?
- Early opportunity Gun2 electrode 200KV
- JUN 10 - AUG 11 (9 week run period)
- Hall A PREX polarized 70uA 1 pass @ 499 MHz
- Hall B unpolarized 100nA 5 pass @ 499 MHz
- Hall C unpolarized 50-90 uA 3-5 pass @ 499 MHz for 3 weeks
- AUG 12 - OCT 25 (11 week SAD period)
- Gun2 electrode 200KV
- Power Wiens from new PS and HVPS?
- NOV 1 - DEC 19 (7 week run period)
- Hall A CREX polarized 150uA 1 pass @ 499 MHz
- Hall B polarized 5 pass @ 250 MHz
- Hall C polarized 30uA 5 pass @ 250 MHz
- Hall D 5 pass @ 250 MHz