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== PREX Run Plan for &nbsp; Commissioning &nbsp; and &nbsp; Auxiliary Measurements ==

See also the [[RunPlanDaily| Daily Run Plan]] and [[Run plan history| Earlier Daily Run Plan]]

[[PREX_I_Run_Plans | PREX I - 2010 Run Plan]]


The experiment is approved for 35 PAC days including 25 production days. There are 49 days on our calendar.<br><br>

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.  For example, the GEM commissioning will occur in about 4 periods of time, each 4 hours, separated by at least one day.  After commissioning we go into a regular production mode; we will provide an updated document webpage for shift worker instructions.

<font color="red"> Total time: ? </font> &nbsp; Based on this list, each day we will come up with an adjustment to the [[RunPlanDaily| Daily Run Plan]].  Some flexibility will be needed to accomodate problems and changes in plans.


== Beam Restoration ==
# <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 beam to dump, through Compton chicane
## 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 will be skipped until we can get targets in (MASK ION CHAMBERS); <font color="red"> CG will coordinate</font>
# <font color="blue">Source and Parity Quality Beam</font>  <span style="background-color:#F1C40F">0 shift (complete before 6/17)</span>: Caryn Palatchi, Amali Premathilake, Kent Paschke
## Source laser optics configuration and initial setpoints <font color="green"> done </font>
## Wein left/ Wein Right injector optics configuration <font color="green"> done </font>
## Characterize injector optics configuration <font color="green"> done </font>

== Low Current Commissioning ==
* Basic beamline commissioning  (may be 3 shifts total)
**Establish low-current beam with spectrometer magnets on. Establish centering on collimator. BPM offset calibration. Commission target ladders.
**Preparations:
*** Stripchart on ion chambers, with bpm4e and bpm4a positions
*** stripchart on collimator and beamline temps with bpm 4a and 4e positions 
*** stripchart on compton rates (with beam current) <span style="color:red">no more 2x what is present in [https://logbooks.jlab.org/entry/3687977 HACOMPTONLOG]</span>
#<font color="blue">Verify Beamline setup </font> <span style="background-color:#F1C40F">1 shift</span> Yves Roblin, Bob
#* Tune mode. No target. Raster off. Ion chambers masked.   <span style="color:red">[http://opsweb.acc.jlab.org/CSUEApps/atlis/atlis.php?load=Task&task_id=19326 ATLis 19326]</span>
##beam transport through Compton chicane up to 5uA CW. 
##* Rates in finger scintillators <span style="color:red">no more 2x what is present in [https://logbooks.jlab.org/entry/3687977 HACOMPTONLOG]</span>
##* ComptonUS1 ~ 30 Hz, ComptonDSbg1  ~ 870 Hz, ComptonDCbg2 ~ 1010 Hz
##spot size at target (harps)  (nominal spec is 150 um x 150 um.  Larger is better) 
##* Use 5uA CW, but keep eye on compton rate, ion chambers, temps.)
##Tune beam. Turn on septum and verify still on dump. Clean transport to dump for PREX set points
##1 arm running (Q1 on) test to verify no beam motion. 
##Turn on both Q1 spectrometers.
# <font color="blue">Hall bullseye scan</font> <span style="background-color:#F1C40F">0.5 shift</span> Bob
#* harp scans at each of 5 points around nominal center, (0,0), (2,2), (2,-2), (-2,-2), (-2,2).
## Set prescale for high rate of clock triggers
## Watch beam on viewer, ion chamber and temperature stripcharts.
## use 2-5uA CW to find each corner position. 4A, 4E harp scan for one of the corner positions and verify EPICS readback of BPMs, check spectrometer BPM calibrations.
### If PREX expert is available, parasitically collect data for low current beam monitoring (cavities). If during day have RC inform J Musson before taking this data.
# <font color="blue"> Collimator checkout </font> <span style="background-color:#F1C40F">0.5 shift</span> Yves, Ciprian G, Kent P
#*will verify that we are cleanly going through the collimator and cross check power deposition calculations
## Target ion chamber setpoints can be set high to allow this test.
## setup ion chamber strip chart
## Establish  2-5uA tune mode, with empty target. Use 4x4 raster. 
## move beam in 2mm steps as much as +/- 1 cm in both horizontal and vertical. Watch for rise the ion chamber signal. Record positions where edges of the collimator bore are found. 
## set beam to center on colllimator based on those edges. 
## compare to position of carbon hole on warm and cold ladders.  Do we need to recheck target frames for targets? Do we need to change encoder positions?
# <font color="blue"> Warm target position </font><span style="background-color:#F1C40F">0.25 shift</span> Kent (Silviu, present or on call?)
#* Verify target alignment.
## insert warm ladder, carbon hole. 
## Set raster for 8mmx8mm 
## establish 2uA CW. Run spot++ to find carbon hole.  log it.
## Adjust raster setting to establish 4x5 raster size. Log it.
## if carbon hole not in 4x4 raster view, need to reconsider. (move beam, or use off center?)
# <font color="blue">Cold target position </font> <span style="background-color:#F1C40F">0.25 shift</span> Kent (Silviu, present or on call?)
#*Verify target alignment. 
#* target and dump ion chamber set points will need to be raised to perform this commissioning
## insert warm ladder, carbon hole. 
## Set raster nominal 8x8 (or what could be used.)
## establish 5uA CW. Run spot++ to find carbon hole.  Log it.
## Set raster to 4x5 set point from before. Use spot++ to verify it. 
## if carbon hole not in 4x5 raster view, need to reconsider. (move beam, or use off center?)
## Move to lead-208 target, location #1(?)
## establish 5uA CW, 4x5 raster. Run spot++ to verify raster size, not hitting edges. Log it.
# <font color="blue">Ion Chamber calibration - thick Target </font> <span style="background-color:#F1C40F">0.25 shift</span> Ciprian G
#* 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, 4x4 raster, on lead 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)
# <font color="blue"> Very low current commissioning </font><span style="background-color:#F1C40F">0.25 shift</span>  Yves. Ye Tian. Caryn. 
#* commission low current cavities relative to stripline calibration. Commission cavity bpm lock.
#* Note: position scan and lock setup are separate pieces, can happen at different times. 
#* Either/ both can happen later (during optics running). Needed before sieve-out Q2 studies.
## Cavity lock   
##* [Yves is required for step]
###setup cavity stripchart. Establish 2uA CW.
### setup cavity slow lock.  Verify that in operation this lock holds the position in the cavity epics readback.
### lower current to 100 nA.  Verify that the lock still holds the cavity epics readback.
## Cavity Position scan. 
###setup cavity stripchart. Establish 2uA CW. 
### Find corrector positions for +/-2mm in X, Y. 
### Reduce current to 50nA. 
### set to each corrector position, verify position measurements with epics readback

== Spectrometer Commissioning ==
[https://prex.jlab.org/DocDB/0003/000378/002/opticsplan_may24.pdf <font color="magenta">'''Detailed Optics Plan'''</font>]  <font color="red">'''Name and time assignments needs to be worked out by optics crew'''</font>
# <font color="blue">tracking checkout - Tune B configuration</font> <span style="background-color:#F1C40F">1 shift</span>: Bob M, Ryan R, Chandan G
## Sieve IN: initial checkout 
### put in C/Ta target; check rates with scalars
### VDC + GEM checkout; look at tracks, VDC spectra; (GEM):noise, pulse-heights, tracks
### Sieve reconstruction verification
# <font color="blue">Tune septum and HRS magnets - Sieve IN</font> <span style="background-color:#F1C40F">1 shift</span> Nilanga L, Chandan G, Ryan R: 
## tune septum for the central ray (quad scans)
## inner edge verification
## Q1 acceptance scan
# <font color="blue">Small spot at quartz</font> Sieve IN, thin Carbon, <span style="background-color:#F1C40F">0.25 shift</span> Ryan, Dustin, Seamus or Nilanga
## modify tune to get small spot at quartz (with raster on)
# <font color="blue">Optics calibration data - Sieve IN </font> <span style="background-color:#F1C40F">0.5 shift</span> Chandan G, Ryan R, Ye: 
## spectrometer momentum scan 
# <font color="blue">Water cell pointing </font> <span style="background-color:#F1C40F">1 shift</span> Chandan G, Ryan R, Ye:
## Sieve IN: pointing measurement
## Sieve OUT: pointing measurement
# <font color="blue">Quartz detector checkout</font> <span style="background-color:#F1C40F">1 shift</span>: Dustin M, 
## verify small spot at quartz (thin C, low current, no raster, sieve out)
## thin C, low current, no raster, Sieve OUT:  positions [[Media:quartzAlignmentRunPlan.pdf|<font color="magenta">Plan</font>]]
## PMT spectra
## rates
## stub check?!
# <font color="blue">Q2 measurement</font> <span style="background-color:#F1C40F">0.5 shift</span>:
## Production target

== High current checkout ==
# <font color="blue">Basic setup</font> <span style="background-color:#F1C40F">0.5 shift</span> Yves R, Ciprian G: 
#* No target.
#* 50uA beam current, through Compton (backgrounds on fingers and Compton photon detector). 
# <font color="blue">High current with target</font> <span style="background-color:#F1C40F">0.5 shift</span> Ciprian G, Dustin M: 
## Establish 4x4 raster. Insert lead target. 
## Detector and SAM voltages (Dustin M)
# <font color="blue">Beamline instrumentation calibration</font> <span style="background-color:#F1C40F">0.5 shift</span> Caryn P,
## Current ramp for BPM/BCM calibrations and detector pedestals
# <font color="blue"> Initial production condition test</font>  <span style="background-color:#F1C40F">0.25 shift</span> Caryn P, 
## detector and SAM widths
## regression sensitivities
## beam noise and asymmetry check
## collimator water and thermocouple temperatures, 
## radiation monitors and ion chamber stability
# <font color="blue"> Width studies  </font>  <span style="background-color:#F1C40F">0.5 shift</span> KK,
## detector and SAM widths, targets, shutters, etc
## deinstall shutters at conclusion of test

== Establish Production Conditions ==
# <font color="blue">Beam modulation</font> <span style="background-color:#F1C40F">0.5 shift</span>Victoria O., Ye T,: 
## turn on and set amplitudes  (<font color="red">plan needed</font>)
## test orthogonality
# <font color="blue">Detector checkout</font> <span style="background-color:#F1C40F">1 shift</span> Dustin M: 
## quartz detector stub test  (<font color="red">plan needed</font>)
## width study   (<font color="red">plan needed</font>)
## raster sync   (<font color="red">plan needed</font>)
# <font color="blue">Spin Dance</font> <span style="background-color:#F1C40F">1 shift</span>: Simona Malace, Sanghwa Park
## Moller polarimeter commissioning (establish beam)   (<font color="red">plan needed</font>)
## Short spin dance (run plan needed, established optimal spin angle for this Wien state)   (<font color="red">plan needed</font>)
# <font color="blue">Hall PQB</font> <span style="background-color:#F1C40F">1 shift</span> Caryn P,: 
## Check asymmetries in the hall  
## Adiabatic dampening / Matching  (<font color="red">plan needed</font>)  
### Use helicity magnets to tune phase trombone
## Establish feedback (if Hall C is not on schedule their feedback for later)
# <font color="blue">Production</font>: <span style="background-color:#F1C40F">0.5-3 shift?</span> All
##
# <font color="blue">AT measurement</font>: <span style="background-color:#F1C40F">1.5 shift?</span> All (<font color="red">plan needed</font>)
## Do we need to verify zero longitudinal using Moller polarimeter?
## Carbon
## Lead
## Calcium
# <font color="blue">Initial Moller commissioning</font> <span style="background-color:#F1C40F">1 shift</span> Simona M, Sanghwa P, 
## minimal set for first absolute measurements 
# <font color="blue">Initial Compton commissioning</font> <span style="background-color:#F1C40F">1 shift</span> Dave G, Juan Carlos C,
## minimal set for  measurement conditions

== <font color="magenta"> '''Start Production''' </font> ==



== Important Activities After First Few Days  ==
# <font color="blue">Linearity Studies</font> -- 
# <font color="blue">Background Studies</font> --
## Scans of Septum Magnet and HRS Dipole
## Thin Lead Target to check for inelastics at high-resolution
## Thin C12 to measure diamond background
# Possible scan of Q1 to optimize acceptance and verify that collimator defines acceptance. (old idea, still relevant?)
# We will start with the Wein in Spin-Right. Once we switch to Spin-Left we need to do another spin-dance.

== Polarimetry Studies ==
# <font color="blue">Compton Commissioning</font> --  &nbsp; Gaskell, et.al.
## Beam Tune, Background reduction -- Bteam, 
## Compton Cavity Checkout  -- 
## Photon Detector Checkout -- CMU group
# <font color="blue">Moller Commissioning</font> -- Simona Malace, Don Jones, et.al.
## Magnet Alignment -- 1 shift (swing)
## Raster size and pulse-mode -- 1 shift (day)
## Target commissioning - 3 shifts
## Pulse-mode target commissioning - 2 shifts
## DAQ checkout -- 1 shift


== Important Activities During run ==
# <font color="blue">Linearity Studies</font> -- 
# <font color="blue">Background Studies</font> --
# Repeat Q2 and pointing measurements
# Arc Energy Measurement