Run2 - October 2015

CEBAF_MeV_Mott_Polarimeter

Mott Run 2 is scheduled from October 23 - 26.

Run II Priorities ?

1. Good knowledge of beam (energy, energy spread, emittance)
2. Target thickness extrapolation at KE=5.0 MeV
3. Sensitivity of analyzing power vs. energy about 5.0 MeV
4. Repeat spot size and possibly energy spread systematic at KE=5.0 MeV
5. Asymmetry vs. beam intensity

Prep and HCO w/o beam

1. (John) 31 MHz laser -
2. (Riad) Test laser RF trigger at DAQ
3. (Joe) Make a photocathode – SL5247-4 (52471-1 was used for Run I, but it's being removed from Gun2 next week)
4. (Marcy) Check Mott vacuum, configuration (hipot 3D01 again?)
5. (Joe) Cycle target ladder, test camera, test magnets, test 2D harp
6. (Riad/Daniel) Check HV, check DAQ, Analysis, Macros ready for 31 MHz

Pre-Run II Beam Setup and Tests

1. (Injector Group) Recovery to FC2 @ 6.3 MeV by 10/15
2. (1 shift) Mott beam test - Test 31 MHz synchronization, set L/R/U/D delays, set PMT HV, check PMT response
3. (1 shift) Beam diagnostics - Test harp, BCM calibration, quick emittance method

Run II Beam and Polarimeter Setup

1. Set KE=5.0 MeV
2. Measure emittance at MQJ0L02
3. Measure energy spread at IHA2D00
4. Verify BCM calibration good
5. Calibrate PITA IHWP=in/out
6. Setup beam to Mott, check PMT HV, TOF spectra, set thresholds HI, check instrumental asymmetry
7. Setup spin direction, use Mott for final adjustment

Target Foil Extrapolation at KE=5.0 MeV

1. Measure foils with large aperture
2. Interleave 1um gold foils to demonstrate stabiilty

Availability

Mott Run 2 Motivation Discussion

• Tim's comments following Aug 12 meeting: media:150813_Gay.docx
• Charlie's comments following Aug 12 meeting: media:150812_Sinclair.docx