Difference between revisions of "Mott Run 2 Journal"

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(Replaced content with "= Proposed Schedule = * media:151015_RunII_Staffing.pdf = Proposed Plan = * media:151014_Mott_Grames.pdf")
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= Prep and HCO w/o beam =
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= Proposed Schedule =
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# (John) 31 MHz laser -
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* [[media:151015_RunII_Staffing.pdf]]
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# (Riad) Test laser RF trigger at DAQ
 
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# (Joe) Make a photocathode – SL5247-4 (52471-1 was used for Run I, but it's being removed from Gun2 next week)
 
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# (Marcy) Check Mott vacuum, configuration (hipot 3D01 again?)
 
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# (Joe) Cycle target ladder, test camera, test magnets, test 2D harp
 
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# (Riad/Daniel) Check HV, check DAQ, Analysis, Macros ready for 31 MHz
 
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# (Riad) Check DAQ data disk space
 
  
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= Pre-Run Beam Setup and Tests  (2 shifts) =
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= Proposed Plan =
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# Recovery to FC2 @ 6.3 MeV by 10/15
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* [[media:151014_Mott_Grames.pdf]]
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# Mott beam test - Test 31 MHz synchronization, set L/R/U/D delays, set PMT HV, check PMT response, dump dipole degaussed
 
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# Beam diagnostics - Test harp, BCM calibration, quick emittance method
 
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= Run II Proposed Plan (9 shifts 10/23 DAY - 10/26 OWL) =
 
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The goal is to collect final data set for the paper describing the performance and systematics regarding it's ability to measure the absolute polarization at 5.0 MeV.
 
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== 2.0 shifts - Good knowledge of beam (energy, energy spread, emittance) ==
 
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# Set KE=5.0 MeV
 
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# Measure emittance at MQJ0L02
 
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# Measure energy spread at IHA2D00
 
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# Verify BCM calibration good
 
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# Calibrate PITA IHWP=in/out
 
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# Setup beam to Mott, check PMT HV, TOF spectra, set thresholds HI, check instrumental asymmetry
 
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# Setup spin direction, use Mott for final adjustment
 
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== 3.5 shifts Target thickness extrapolation at KE=5.0 MeV ==
 
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# Use the 10 foils with 25mm aperture spanning 8 nominal thicknesses (0.05, 0.05, 0.225, 0.35, 0.35, 0.50, 0.625, 0.750, 0.87, 1.0)
 
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# Interleave 1um gold foils to demonstrate stabiilty
 
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== 2.0 shifts Sensitivity of analyzing power vs. energy about 5.0 MeV ==
 
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# Imagine 0.5 shift/energy => 4 energies (4.0, 4.5, 5.5, 6.0)
 
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# In 1 hour: set nominal energy, measure precisely, forego emittance measurement but set spot size at target
 
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# In 3 hour: asymmetry measurements at 1.0, 0.75, 0.50, 0.225 um
 
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== 1.0 shifts Repeat spot size and possibly energy spread systematic at KE=5.0 MeV ==
 
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# Use emittance measurement to calculate RMS beam size on foil (minimum, 1.0, 1.5, 2.0 mm)
 
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# Varying energy spread a bit more tricky since energy and to some extent emittance depends on phase in second cavity : maybe a measurement for another time?
 
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== 0.5 shifts Asymmetry vs. beam intensity ==
 
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# Test beam and Mott spectra (TOF + discriminators) up to 100 uA to dump in through hole
 
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# Measure asymmetry 0.35 um foils (1, 5, 10, 25, 50, 75, 100 uA).
 

Revision as of 11:48, 15 October 2015

Proposed Schedule

Proposed Plan

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