Start up run plan

From Hall A Wiki
Revision as of 08:16, 27 September 2010 by Jroche (Talk | contribs) (Beam quality optimization study)

Jump to: navigation, search

Back to DVCS
Back to Daily_Run_Plan

Last update: Sunday 09-26-2010

Absolute best-case scenario:

  • Monday 09-27-2010: DAY shift
    • start cooling magnets
  • Monday 09-27-2010: SWING (or late-Day)
    • lockup
    • hot checkout (MCC)
    • start threading beam to the Hall
  • Tuesday 09-28-2010: OWL
    • start commissioning

Beam no LHRS, no solid target, no cryo target

We will start with a 5 passes beam. The tasks below appear roughly in order of priority, one assumes that we have solid targets in place.

Getting beam threaded down to the dump for the first time

Beam quality optimization study

Goal: optimize beam quality to limit noise in calorimeter, once shoot for something like 100 Hz in the detector per uA of beam.
Need: working Compton photon detector with appropriate HV and threshold settings, working Compton DAQ that can provide scaler data to the appropriate EPICS channel
Contact: Eric Fuchey for Compton, Jay, MCC support for beam manipulation.

BPM calibration

Goal: check response of the BPMs to know motion of the beam
Need: Harps working, BPMs reading at least through EPICS, 5uA beam
Method: For each of the following approximative beam position, record beam position with the BPMS and with the harps. Beam position : (0,0), (0,2), (0,-2), (2,0), (-2,0)
Contact: J. Roche.

BCM calibration

Goal: calibrate BCM readings between 0 and 20 uA, with special care to readings between 2 and 7 uA
Need: BCMs reading at least through EPICS
Method: MCC procedure (MCC-PR-04-008) [[1]]
Contact: J. Roche

Raster size calibration

Goal: to check the raster size against effective readout.
Need: BPM calibration, 5uA, BPM readings in a coda file to be able to run spot++ (Need to define DAQ setting : T8 ??)
Method: vary the size of the raster, take one run for each of the following MCC unit raster size (3*2), (7*5), (10*8), produce spot++ image at each setting. Those settings are taken off that page [[2]]
Contact: J. Roche

Energy measurement

Goal: to know the beam energy to 10-4
Need:the ninth dipole to work
Method:MCC procedure MCC-PR-04-006 [[3]]
Contact: A. Saha

Compton work??

Not sure what to put here... Can we do things with the 5-pass beam?
Contact: C. Hyde??

Cavity monitors checkout

Again not sure what goes there...

Beam with no LHRS, no cryo target but solid target

Luminosity detector check out

Goal: check that the lumi detector scaler readings make sense eg: rates versus beam current
Need: carbon target and beam varying between 0 and 20 uA
Method: take short runs with various beam intensity
Contact: K. Allada

Center beam on target

Goal: get the beam to hit the center of the holed carbon foil
Need: BPMs reading at least through EPICS, single rates in the calo??
Method:Insert Beo target, shoot 5uA and center un-rastered beam on the center of the Beo target. Insert holed Carbon target, turn on ratser, take a run with single in the calo ??
Contact: C. Munoz Camacho

Establish maximum luminosity sustainable by calo

Goal: to define luminosity at which we are getting too many pile-up in the ARS (not ideal on the carbon target...
Method: ??
Contact: C. Munoz Camacho

Elastic counts in the Calorimeter

Goal: exercise our reading of the calo
Need: solid Carbon target, ARS readout, to define the calo angle, distance to target
Method: ?? Contact: C. Munoz Camacho

Beam without any cryo and with some cryo to LHRS and Moeller

Moeller commissioning

Need: some cryo to cool down the solenoid
Contact: J. Zhang

LHRS re-commissioning

Jack Segal says that the LHRS power supplies have seen major repairs over the down and will require re-commissioning once the magnets are cold and can handle full current. He's estimating 2--3 day shifts (which includes some time for dealing with problems that may come up).