Difference between revisions of "CREXRunPlan-August20"

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Several of the early tasks, including some beam restoration and low current commissioning, can be accomplished starting Nov 25.  During this time period, we expect to do Moller polarimetry measurements/commissioning with 1 pass and 5 pass beam.
 
Several of the early tasks, including some beam restoration and low current commissioning, can be accomplished starting Nov 25.  During this time period, we expect to do Moller polarimetry measurements/commissioning with 1 pass and 5 pass beam.
  
−
== Beam Restoration ==
+
== Beam Restoration and Low Current Commissioning ==
 
# <font color="blue">Basic beam setup</font> <span style="background-color:#F1C40F">1 shift</span>: Yves Roblin   
 
# <font color="blue">Basic beam setup</font> <span style="background-color:#F1C40F">1 shift</span>: Yves Roblin   
−
#* establish tune beam and low current CW beam in the hall.
+
#* establish tune beam and low current (up to 2uA?) CW beam in the hall.
−
## Establish beam to dump, through Compton chicane
+
## Establish beam to dump.
 +
##* assume collimator centering as before, trajectory as before
 +
##* spectrometer magnets on
 +
##* insert optics C-hole target, verify target location with Spot++
 +
# First Spectrometer optics / chamber calibration check
 +
#* Carbon optics target, sieve out (needed for t0 calibration?)
 +
#* Carbon optics target, sieve in (verify acceptance, verify optics db with new VDC alignment/calibration)
 +
#* same, with GEM data
 +
#* Verify Cold target position
 +
## spot++ on C-hole
 +
## spot++ on Ca-48
 +
# Detector alignment
 +
## start with initial detector guess for detector alignment.  (sieve out, Ca-48 target)
 +
##* Do not refine for small details! +/- 2mm is fine)
 +
##* Do not adjust At detector alignment at this time
 +
## if right arm not functional, use GEMs with Chandan's GEM alignment?
 +
## Take Q2 data (longer run after alignment selected)
 +
# Deferred to later:
 +
## C-foil optics data (sieve in, dp=+1,0,-1)
 +
## water cell data (sieve in dp=+1,0,-1)
 +
## At detector alignment
 +
## Do we want:
 +
##* repeat harp/bullseye scan?
 +
##* repeat collimator centering scan?
 +
== High current checkout ==
 +
 
 +
# Establish high current to hall dump.  150uA.  Radiation, IC levels should match expectation.
 +
# <font color="blue">Ion Chamber calibration - thick Target </font> <span style="background-color:#F1C40F">0.25 shift</span>
 +
## Should be easy/standard procedure, but verify calibration matches old calibration
 +
## verify trip points match old trip points, running conditions for high current match old high current running. If not, differences must be understood.
 +
# Setup beam through Compton chicane.
 +
#* must keep watch on Compton rates whenever through Compton chicane
 +
# FFB commissioning. Expected to be used when running high current
 +
# Establish beam on cold target
 +
#* integrating mode detectors
 +
## C-hole, spot++
 +
## Thick carbon target. Spot++ to verify on target
 +
## Thick carbon to high current.  Burn off (30 minutes each at 50,100,150uA)
 +
## Ca-48 target. Spot++ to verify on target
 +
## Ca-48 to high current.  Burn off (30 minutes each at 50,100,150uA)
 +
# Verify beam modulation functionality
 +
#* low current test, then high current to watch of Ion Chamber rates or beam loss
 +
#* Ignore orthogonality for first test
 +
# Test production with 1-2 hours.
 +
## detector and SAM widths
 +
## regression sensitivities
 +
## beam noise and asymmetry check
 +
## collimator water and thermocouple temperatures,
 +
## radiation monitors and ion chamber stability
 +
## Tune beam modulation orthogonality, if needed, after 1-2 hours, then take at least 1 hour data to confirm test.
 +
 
 +
== <font color="magenta"> '''Start Production''' </font> ==
 +
 
 +
== Other Early Tests and Checks (first few days) ==
 +
# Beam Monitor calibration
 +
#* soon after restart
 +
## Run current scan using Unser to calibrate beam charge monitor readout in parity DAQ. 
 +
##* Run the Compton DAQ concurrently, for calibration
 +
##  Go to FixedGain when at 150 uA on bpms (list of crates???) and repeat local current scan to set bpm pedestals.
 +
# Fine-tune detector alignment
 +
# At detector alignment
 +
# Compton commissioning
 +
# Moller measurement
 +
 
 +
== Other Tests and Checks ==
 +
# Do we need to repeat spin-dance?
 +
# <font color="blue">Linearity Studies</font>
 +
# Repeat Q2 and pointing measurements
 +
# Arc Energy Measurement
 +
# <font color="blue">Background Studies</font>
 +
## Scans of Septum Magnet and HRS Dipole
 +
# Possible scan of Q1 to optimize acceptance and verify that collimator defines acceptance. (old idea, still relevant?)
 +
 
 +
== Polarimetry Studies ==
 +
 
 +
# <font color="blue">Compton Commissioning</font>
 +
## Beam Tune, Background reduction
 +
## Compton Cavity Checkout
 +
### Establish laser in cavity
 +
### Move photon detector to visual center, scan beam for collisions
 +
### Establish orbit lock
 +
## Photon Detector Checkout
 +
### Detector power-up, find optimal gain.
 +
### Center detector with fingers.
 +
### 15 minute spectrum and rate study.
 +
### Brief target-out run? (Probably not necessary but may be desirable)
 +
### Polarization commissioning run (up to 2 hour target-in)
 +
### Jaws checkout (?)
 +
# <font color="blue">Moller Commissioning</font> -- Simona Malace, Don Jones, et.al.
 +
 
 +
 
 +
 
 +
<!---
 
## Design match to hall expected as part of original configuration, if additional beam time is required will be necessary to coordinate with optics/production runplan
 
## Design match to hall expected as part of original configuration, if additional beam time is required will be necessary to coordinate with optics/production runplan
 
## ion chamber calibration (should be ready for this if not already done). We should have targets ready; neeed targets in (MASK ION CHAMBERS); <font color="red"> Dustin will coordinate</font>
 
## ion chamber calibration (should be ready for this if not already done). We should have targets ready; neeed targets in (MASK ION CHAMBERS); <font color="red"> Dustin will coordinate</font>
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## Characterize injector optics configuration <font color="green"> done </font>
 
## Characterize injector optics configuration <font color="green"> done </font>
  
 +
--->
 +
 +
<!--
 
== Low Current Commissioning ==   
 
== Low Current Commissioning ==   
 
* Basic beamline commissioning  (may be 3 shifts total)
 
* Basic beamline commissioning  (may be 3 shifts total)
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## Move to Ca-40 target, location #(?)
 
## Move to Ca-40 target, location #(?)
 
## establish 5uA CW, 2x2 raster. Run spot++ to verify raster size, not hitting edges. Log it.
 
## establish 5uA CW, 2x2 raster. Run spot++ to verify raster size, not hitting edges. Log it.
−
# <font color="blue"> Very low current commissioning </font><span style="background-color:#F1C40F"></span>  '''Very low current not needed because 1 uA is only few kHz in detectors.'''  <!--
+
# <font color="blue"> Very low current commissioning </font><span style="background-color:#F1C40F"></span>  '''Very low current not needed because 1 uA is only few kHz in detectors.'''   
 +
-->
 +
 
 +
<!--
 
  '''LOW CURRENT CAVITIES WILL BE SET UP THE SAME AS FOR PREX-II (so don't need this)'''
 
  '''LOW CURRENT CAVITIES WILL BE SET UP THE SAME AS FOR PREX-II (so don't need this)'''
 
#* commission low current cavities relative to stripline calibration. Commission cavity bpm lock.
 
#* commission low current cavities relative to stripline calibration. Commission cavity bpm lock.
Line 102: Line 200:
 
####Look at the strip chart of IPM1H04BX, IPM1H04CX, IPM1H04DX and IPM1H04BY, IPM1H04CY,  (current signal) IPM1H04DY, IPM1H04B, IPM1H04C, IPM1H04D, if the signal is saturate or too small to present. Then we need to change the gain of the cavity BPMs
 
####Look at the strip chart of IPM1H04BX, IPM1H04CX, IPM1H04DX and IPM1H04BY, IPM1H04CY,  (current signal) IPM1H04DY, IPM1H04B, IPM1H04C, IPM1H04D, if the signal is saturate or too small to present. Then we need to change the gain of the cavity BPMs
 
#####Change the gain, please call Ye Tian (803-553-3570)  -->
 
#####Change the gain, please call Ye Tian (803-553-3570)  -->
 +
 +
<!--
  
 
== Spectrometer Commissioning ==
 
== Spectrometer Commissioning ==
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##* Look at septum hole pattern, check no missing holes (if sieve is in)  
 
##* Look at septum hole pattern, check no missing holes (if sieve is in)  
 
## Check eigenvector quads steps of +/- 1% on Q1?  
 
## Check eigenvector quads steps of +/- 1% on Q1?  
−
##* Analyze for Left/Right x and y width.
+
##* Analyze for Left/Right x and y width.  
−
<!-- ## Take a run along eigenvector quads +/-10% for Q1 filed +/-10% over 5 points (cycle, then scan top to bottom) -->
 
 
## Expected: width should be minimized  
 
## Expected: width should be minimized  
 
##* Tune that minimizes width at detectors is new central tune.  
 
##* Tune that minimizes width at detectors is new central tune.  
Line 201: Line 300:
 
# <font color="blue"> Position At detectors </font>: Dustin, Ryan
 
# <font color="blue"> Position At detectors </font>: Dustin, Ryan
  
−
== High current checkout ==
+
-->
−
<font color="red">'''REMEMBER: Remove the beamdump difusor before going to high current!'''</font>
 
  
−
# <font color="blue">Ion Chamber calibration - thick Target </font> <span style="background-color:#F1C40F">0.25 shift</span> Dustin, Caryn will coordinate with Nick Gauthier
+
<!--
−
#* Procedure discussed with Eric Forman: thick target calibration procedure (ramp 2-10uA) for ALL ion chambers (including the dump)
 
−
#* Must keep rates in compton finger scintillators; <span style="color:red">no more 2x what is present in [https://logbooks.jlab.org/entry/3687977
 
−
## Establish beam, 5uA beam, 2x2 raster, on Ca-40 target. 
 
−
## move beam to x=+1mm (relative to collimator center)
 
−
## target and dump ion chamber setpoints can be set high this configuration
 
−
## Execute thick target Ion Chamber calibration, From Atlis 19326. This calibration will be used to set ion chamber setpoints.
 
−
### Dump and Near-target ICs: set for 45 degree targets by projecting ion chamber setpoints for 20uA  current or 90 degree targets by projecting to 70uA current.
 
−
#* parasitic: first check of SAMs at low current (call Devi? or Dustin? before starting)
 
  
 
[[CREX Detailed High current plan|detailed plan]]
 
[[CREX Detailed High current plan|detailed plan]]
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== Important Activities After First Few Days  ==
 
== Important Activities After First Few Days  ==
−
# <font color="blue">Linearity Studies</font> --
+
# <font color="blue">Linearity Studies</font>  
−
# <font color="blue">Background Studies</font> --
+
# <font color="blue">Background Studies</font>  
 
## Scans of Septum Magnet and HRS Dipole
 
## Scans of Septum Magnet and HRS Dipole
 
## Thin Lead Target to check for inelastics at high-resolution
 
## Thin Lead Target to check for inelastics at high-resolution
Line 353: Line 443:
 
# Repeat Q2 and pointing measurements
 
# Repeat Q2 and pointing measurements
 
# Arc Energy Measurement
 
# Arc Energy Measurement
 +
 +
-->

Revision as of 12:43, 31 July 2020


CREX Main


CREX August 2020 Run Plan for Commissioning and Auxiliary Measurements Will Ultimately Go Here, but Hasn't Been Started Yet

See also the Daily Run Plan and Previous Daily Run Plans and Auxiliary Measurements

PREX I - 2010 Run Plan PREX II - 2019 Run Plan PREX2 2019 Auxiliary Measurements

The experiment is approved for 45 PAC days including ? production days. There are 87 days on our calendar.

Below is a list of tasks in the approximate time order, with person(s) responsible, approximate amount of time required, and comments about the conditions or needs. The time will, in most cases, be broken up into manageable chunks if needed, but given the extensive preparations and experience from the PREX run, we hope to expedite most of these tasks. Differences could be when dealing with the target and higher beam currents, for example. After commissioning, we go into a regular production mode; we will provide an updated document webpage for shift worker instructions.

Total time: ?   Based on this list, each day we will come up with an adjustment to the Daily Run Plan. Some flexibility will be needed to accommodate problems and changes in plans.

Several of the early tasks, including some beam restoration and low current commissioning, can be accomplished starting Nov 25. During this time period, we expect to do Moller polarimetry measurements/commissioning with 1 pass and 5 pass beam.

Beam Restoration and Low Current Commissioning

  1. Basic beam setup 1 shift: Yves Roblin
    • establish tune beam and low current (up to 2uA?) CW beam in the hall.
    1. Establish beam to dump.
      • assume collimator centering as before, trajectory as before
      • spectrometer magnets on
      • insert optics C-hole target, verify target location with Spot++
  2. First Spectrometer optics / chamber calibration check
    • Carbon optics target, sieve out (needed for t0 calibration?)
    • Carbon optics target, sieve in (verify acceptance, verify optics db with new VDC alignment/calibration)
    • same, with GEM data
    • Verify Cold target position
    1. spot++ on C-hole
    2. spot++ on Ca-48
  3. Detector alignment
    1. start with initial detector guess for detector alignment. (sieve out, Ca-48 target)
      • Do not refine for small details! +/- 2mm is fine)
      • Do not adjust At detector alignment at this time
    2. if right arm not functional, use GEMs with Chandan's GEM alignment?
    3. Take Q2 data (longer run after alignment selected)
  4. Deferred to later:
    1. C-foil optics data (sieve in, dp=+1,0,-1)
    2. water cell data (sieve in dp=+1,0,-1)
    3. At detector alignment
    4. Do we want:
      • repeat harp/bullseye scan?
      • repeat collimator centering scan?

High current checkout

  1. Establish high current to hall dump. 150uA. Radiation, IC levels should match expectation.
  2. Ion Chamber calibration - thick Target 0.25 shift
    1. Should be easy/standard procedure, but verify calibration matches old calibration
    2. verify trip points match old trip points, running conditions for high current match old high current running. If not, differences must be understood.
  3. Setup beam through Compton chicane.
    • must keep watch on Compton rates whenever through Compton chicane
  4. FFB commissioning. Expected to be used when running high current
  5. Establish beam on cold target
    • integrating mode detectors
    1. C-hole, spot++
    2. Thick carbon target. Spot++ to verify on target
    3. Thick carbon to high current. Burn off (30 minutes each at 50,100,150uA)
    4. Ca-48 target. Spot++ to verify on target
    5. Ca-48 to high current. Burn off (30 minutes each at 50,100,150uA)
  6. Verify beam modulation functionality
    • low current test, then high current to watch of Ion Chamber rates or beam loss
    • Ignore orthogonality for first test
  7. Test production with 1-2 hours.
    1. detector and SAM widths
    2. regression sensitivities
    3. beam noise and asymmetry check
    4. collimator water and thermocouple temperatures,
    5. radiation monitors and ion chamber stability
    6. Tune beam modulation orthogonality, if needed, after 1-2 hours, then take at least 1 hour data to confirm test.

Start Production

Other Early Tests and Checks (first few days)

  1. Beam Monitor calibration
    • soon after restart
    1. Run current scan using Unser to calibrate beam charge monitor readout in parity DAQ.
      • Run the Compton DAQ concurrently, for calibration
    2. Go to FixedGain when at 150 uA on bpms (list of crates???) and repeat local current scan to set bpm pedestals.
  2. Fine-tune detector alignment
  3. At detector alignment
  4. Compton commissioning
  5. Moller measurement

Other Tests and Checks

  1. Do we need to repeat spin-dance?
  2. Linearity Studies
  3. Repeat Q2 and pointing measurements
  4. Arc Energy Measurement
  5. Background Studies
    1. Scans of Septum Magnet and HRS Dipole
  6. Possible scan of Q1 to optimize acceptance and verify that collimator defines acceptance. (old idea, still relevant?)

Polarimetry Studies

  1. Compton Commissioning
    1. Beam Tune, Background reduction
    2. Compton Cavity Checkout
      1. Establish laser in cavity
      2. Move photon detector to visual center, scan beam for collisions
      3. Establish orbit lock
    3. Photon Detector Checkout
      1. Detector power-up, find optimal gain.
      2. Center detector with fingers.
      3. 15 minute spectrum and rate study.
      4. Brief target-out run? (Probably not necessary but may be desirable)
      5. Polarization commissioning run (up to 2 hour target-in)
      6. Jaws checkout (?)
  2. Moller Commissioning -- Simona Malace, Don Jones, et.al.





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