Difference between revisions of "CREXAuxiliaryMeasurements"

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(Created page with "<br> <B>CREX Main</B> << CREX Run Plan == WORK IN PROGRESS== #Please don't worry if there is a needless test on here, or an important one mi...")
 
 
(3 intermediate revisions by the same user not shown)
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== Optics and Q2 ==
 
== Optics and Q2 ==
−
# <font color="blue">Energy Measurement </font> (Doug) (non-invasive)
+
# <font color="red">Energy Measurement </font> (Doug) (non-invasive)
 
#* <font color="red"> Priority High </font>  
 
#* <font color="red"> Priority High </font>  
−
#* Can be performed Day shift Monday or Tuesday?
 
 
#* look for 1e-3 accuracy. Non invasive.
 
#* look for 1e-3 accuracy. Non invasive.
−
# <font color="maroon">Optics Data</font>
 
−
#* retake watercell, optimization data, inelastic spectrum data
 
 
# <font color="blue"> Q2 measurement</font>  
 
# <font color="blue"> Q2 measurement</font>  
 
#* Repeat of Q2 measurement, with improved pedestal noise control.  
 
#* Repeat of Q2 measurement, with improved pedestal noise control.  
 
#* Detector counting mode.   
 
#* Detector counting mode.   
 
#* S0 trigger
 
#* S0 trigger
−
#* Lead target
 
 
#* production raster and beam position
 
#* production raster and beam position
 +
# <font color="blue">Optics Data</font>
 +
#* retake watercell,
 +
#* retake optimization data
 +
#* inelastic spectrum data
  
 
== Backgrounds ==
 
== Backgrounds ==
−
# <font color="maroon">Stubby Quartz / Blinded Quartz </font> (Dustin)  (4 hours?)
+
# <font color="blue">Stubby Quartz / Blinded Quartz? </font>  
−
#* <font color="red"> Very High priority.  Wednesday Swing? Thursday Day?</font>
 
 
#* Longish access to setup and back out, but short data taking period (production conditions).   
 
#* Longish access to setup and back out, but short data taking period (production conditions).   
 
#* Replace detector quartz with superelastic stub or blinding cap  (alternate US/DS and L/R)
 
#* Replace detector quartz with superelastic stub or blinding cap  (alternate US/DS and L/R)
 
#* Integrating measurement.  Could normalize increased gain just by lowering beam current in production condition.  
 
#* Integrating measurement.  Could normalize increased gain just by lowering beam current in production condition.  
 
#* If surprising results found, continue test or plan second test
 
#* If surprising results found, continue test or plan second test
−
# <font color="blue">Rescattering measurement</font> (Bob, Cip?) (~1 shift)
+
# <font color="blue">Rescattering measurement</font> (~1 shift)
 
#* [[RescatteringPlan | Detailed Rescattering Runplan]]
 
#* [[RescatteringPlan | Detailed Rescattering Runplan]]
−
#* <font color="red">High Priority</font>
+
#* perhaps plan for late april?
 
#* repeat of previous measurements, but new optics and a crucial cross-check
 
#* repeat of previous measurements, but new optics and a crucial cross-check
 
#* Detune spectrometer up in momentum, to dump elastic peak into spectrometer wall.  
 
#* Detune spectrometer up in momentum, to dump elastic peak into spectrometer wall.  
Line 37: Line 36:
 
#* At each dipole setting, also take data with nominal septum
 
#* At each dipole setting, also take data with nominal septum
 
#* Once the elastic peak is out of the focal plane, it should be possible turn on the S3 and S0 scintillator.  This should be done when possible, and the T1/T2/T3 trigger rate recorded for each run.
 
#* Once the elastic peak is out of the focal plane, it should be possible turn on the S3 and S0 scintillator.  This should be done when possible, and the T1/T2/T3 trigger rate recorded for each run.
−
# <font color="maroon">Pole tip re-scattering </font> (Bob, Cip?)
+
# <font color="blue">Pole tip re-scattering </font>  
 
#* Requires investigation or planning - do we have an idea here?
 
#* Requires investigation or planning - do we have an idea here?
 
#* Q2 or septum mis-tune, to increase interception on pole tip and improve poletip rescattering estimate
 
#* Q2 or septum mis-tune, to increase interception on pole tip and improve poletip rescattering estimate
−
# <font color="maroon">A_T detectors </font> (Dustin)  
+
# <font color="blue">A_T detectors </font>   
−
#* Significant asymmetries found in A_T detectors, requires investigation and planning.  A_t detectors now blinded.
+
#* Do we want to blind them again?
  
 
== Detectors ==
 
== Detectors ==
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== Moller polarimetry ==
 
== Moller polarimetry ==
 
# <font color="blue">Repeat measurements</font>  
 
# <font color="blue">Repeat measurements</font>  
−
#* about 2x/week.  Goal: 1-1.5 shifts per measurement.   
+
#* about ~30-60C.  Goal: 1-1.5 shifts per measurement.   
−
#*need enough granularity to track changing polarization.
+
# Q2 scan?
−
# <font color="blue">IHWP IN/OUT</font>
+
# deadtime scan?
−
# <font color="blue">Copper false/asymmetry </font>
+
# target position scan?
−
# <font color="blue">Target uniformity</font>
 
  
 
== Compton polarimetry ==
 
== Compton polarimetry ==

Latest revision as of 15:47, 10 March 2020


CREX Main << CREX Run Plan


WORK IN PROGRESS

  1. Please don't worry if there is a needless test on here, or an important one missing, or bad prioritization.
  2. Lets fix it

Optics and Q2

  1. Energy Measurement (Doug) (non-invasive)
    • Priority High
    • look for 1e-3 accuracy. Non invasive.
  2. Q2 measurement
    • Repeat of Q2 measurement, with improved pedestal noise control.
    • Detector counting mode.
    • S0 trigger
    • production raster and beam position
  3. Optics Data
    • retake watercell,
    • retake optimization data
    • inelastic spectrum data

Backgrounds

  1. Stubby Quartz / Blinded Quartz?
    • Longish access to setup and back out, but short data taking period (production conditions).
    • Replace detector quartz with superelastic stub or blinding cap (alternate US/DS and L/R)
    • Integrating measurement. Could normalize increased gain just by lowering beam current in production condition.
    • If surprising results found, continue test or plan second test
  2. Rescattering measurement (~1 shift)
    • Detailed Rescattering Runplan
    • perhaps plan for late april?
    • repeat of previous measurements, but new optics and a crucial cross-check
    • Detune spectrometer up in momentum, to dump elastic peak into spectrometer wall.
    • Measure (integrating mode) signal in main detectors. Requires HV boot-strap to get higher gain (is 10x possible?)
    • should scale all spectrometer magnets.
    • At each dipole setting, also take data with nominal septum
    • Once the elastic peak is out of the focal plane, it should be possible turn on the S3 and S0 scintillator. This should be done when possible, and the T1/T2/T3 trigger rate recorded for each run.
  3. Pole tip re-scattering
    • Requires investigation or planning - do we have an idea here?
    • Q2 or septum mis-tune, to increase interception on pole tip and improve poletip rescattering estimate
  4. A_T detectors
    • Do we want to blind them again?

Detectors

  1. Linearity Studies (PITA + current scans) (Caryn)
    • These are ongoing - should continue regularly. ~ 1 hour every 3 days.
  2. Linearity LED tests
    • This will be studied off line

Other

  1. Sign check
    • run Moller, Compton, and parity DAQ for quick PITA scan
    • Have we already done this? Parasitic with any PITA scan

Moller polarimetry

  1. Repeat measurements
    • about ~30-60C. Goal: 1-1.5 shifts per measurement.
  2. Q2 scan?
  3. deadtime scan?
  4. target position scan?

Compton polarimetry

  1. No-target runs
  2. Laser polarization optimization
  3. Laser polarization flip
  4. linearity studies
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