Feb runplan

E08-027/E08-007 Commissioning Runplan (K. Slifer / K. Allada)

Straight-through Beamline Commissioning (Y. Roblin) 29 Feb - Mar 1st

Initial Beam Accelerator Ops, with assistance from the Hall A shift crew. This includes delivery of beam to the dump, commissioning of the BPMs, calibration with the Harp and power up of the rasters.

Full Details for ONLY straight-through beam delivery are provided at:

• Initial straight-through beam delivery

Start-up configuration

1. Two pass beam, E0 =2.2 GeV, polarized, no raster.
2. Current: Initially pulsed up to 2-4<math>\mu</math>A pulsed, then up to 5 <math>\mu</math>A CW.
3. Spectrometers at 12.5 degrees, <math>P_0=??</math> MeV (carbon elastic).
4. Sieve slits : OUT.
5. Septa settings: 5.69 degrees.
6. Compton chicane: OFF.
7. Polarized Target chicane : OFF and degaussed.
8. Tungsten Calorimeter : Retracted.
9. Polarized Target: Field OFF

Beam Diagnostics Check-out (Pengjia, Alexandre, Kalyan)

1. Check BPM, slow and fast raster signals in the data
2. Is spot++ working for both arms?
3. Do HARP scan
4. BPM calibration by Pengjia here
   1. It includes calibrating beam positions with both straight-thru and target field ON
5. Check BCM signals in the scalers (HRS, third arm)

Tungsten Calorimeter Check-out (Alexandre, Pengjia)

(Can be done either in straight-through or when going through Chicane)

1. Commission tungsten calorimeter
2. BCM calibration ?
3. How do we establish that we can achieve ~1% measurement ?

HRS/Detector Checkout

(Resp: g2p students)

• Most of these check-out can be done during the initial beamline commissioning( both straight-through or when going through Chicane).
• The order in which these checks are done do not matter (some of them are independent).
• After we finish these checks we should be ready to do optics runs with target field.

HRS Detectors Check-out (Melissa, Ryan, Vince)

1. Check all the detectors in both arm to establish that we don't have problems.
2. Post ALL the online plots for the detectors (ADC, TDC etc..) in the Halog
   1. VDC (efficiencies etc..)
   2. Gas Cerenkov (ADC and timing peaks)
   3. S1 and S2m (ADC and timing peaks)
   4. Lead-glass Calorimeter (ADC)
3. Check HV on all the detectors, align the peaks if necessary

DAQ/Trigger Check-out (Melissa, Ryan, Vince)

1. Establish the DAQ conditions for production
   1. What is the max rate DAQ can run with < 20% DT (Buffered and unbuffered mode) ?
   2. Record deadtime as a function of DAQ rate. Change rate via current or prescalers.
   3. Check synchronization of ROCs in buffered mode
   4. Make sure all important scaler channels are working (BCM, Helicity, triggers, L1A, clock)
   5. Check scalers in S1 and S2m detectors for double pulsing

Third Arm Detector Check-out (Chao, Kalyan)

1. Set thresholds for 2.2 GeV beam
2. Check for bad channels, double peaks etc ..
3. Check deadtime, helicity, BCM scalers

Lumi Detector Check-out (Pengjia, Kalyan)

1. Adjust HV with 100nA current to make sure all channels are roughly aligned and there is no saturation in Happex ADC
2. Establish non linearity of the Lumi detectors
3. Measure lumi asymmetries

Straight-through Optics (Mar 2nd- Mar 4th)

(Resp : Jixie, Min et al.)

HRS and Septum Magnet Checks

1. Cycle magnets?
2. Use carbon target and set HRS to elastic setting.
3. Septum field vs current, checks with carbon elastic peaks
   1. Set the dipole first and then tune quads?

On-line Analysis

(Resp: Toby)

1. Make sure all on-line analysis scripts are up to date on both arms
2. Post easy instructions for the shift crew on how to start online analysis (stick notes near the DAQ machine)
3. Make sure all the important information is recorded correctly in the datastream:
   1. EPICS: Beam diagnostics(BCM, BPM, HARP etc..)
   2. Target variables
   3. Helicity sorted scalers information ( triggers, L1A, BCM, helicity etc.)
   4. Helicity in ADC, scaler, TIR
4. Start-of-Run and End-of-Run information is up to date with all relevant info

Compton Test (2 shifts, Mar 3-4)

(Resp: Sirish et al.)

1. Establish beam through Compton chicane
2.  ??

Moller Commissioning (1 shift, Mar. 3- 4)

(Resp: O. Glamazdin, J. Zhang)

1. Detector HV tuning (30min)
2. Q1 and Q2 quadruple magnets scan (1hour)
3. Moller target longitudinal scan (30 min)
4. Beam polarization measurement (30-40min)
5. MCC job (to set Moller settings and to restore previous beam parameters) (~2hours)

Total: 5 hours.

Helicity Checks

(Resp: Chao, Pengjia, Kalyan)

1. Better to do this during Moller runs
2. Larger charge asymmetry runs to check BCM/helicity signals in HAPPEX, HRS, thirdarm, Moller DAQs simultaneously
3. Establish that there are no problems by checking Hall-A beam charge asymmetries measured in Hall-C

Commissioning Beamline Chicane (March 5th onwards)

1. Mostly Y. Roblin will be driving this part (I will put an ATLis link when it is available):
2. Start with E0 = 2.2 GeV , B = 2.5 T and theta_target = 90 deg
   1. Check beam diagnostics again, when going through chicane
   2. We can do some of our optics while Yves is doing this checks (Jixie et al.)
   3. BPM+slow raster calibration can also be done during this time (Pengjia)
3. E0= 2.2 GeV, B = 5 T and theta_target = 6 deg
   1. Continue doing optics (Jixie et al.)
4. Move to GEp production

Optics with chicane (March 5th onwards)

(Resp: Jixie, Min, Vince et al.)

1. With beam going through chicane:
   1. Full details are provided at : Optics run plan

Dilution/Packing fraction Runs

(Resp : Kalyan, Jixie)

1. E0= 2.2 GeV, B = 5 T and theta_target = 6 deg
   1. Run with thick Carbon target, raster on, 100nA (approximation for N2 contribution)
   2. Run with Empty Cell (includes Al end caps + tungsten cross hair + He4)
   3. The uncertainties due to not having NMR coil in the Empty cell can partially(?) get compensated by the tungsten cross hair?
   4. Run with No target to get contribution from He4 only ?
2. Repeat these measurement in every g2p/gep configuration

Beam Energy Measurement

(Resp: Doug?)

1. Mott ?