Monday, Apr. 4: SWING Shift

From Hall A Wiki
Jump to: navigation, search

Go back to Daily Run Plan Daily Run Plans

Specific mission

  • DVCS calorimeter calibration runs at 2 pass


LH2 target, unrastered beam (which means beam current 5 uA - not more than 5 !!!).

LHRS in positive polarity.

Open LHRS collimator

DAQ: DVCS config

angle LHRS= 38.04 deg

momentum LHRS= 2.127 GeV

beam energy= 4.5 GeV

We will take about 1 hour beam with three calorimeter angles: 26.5, 25 and 23.5 deg.

General Info

Harp scan

When in need of asking MCC for a harp scan don't forget to mention that the raster should be OFF.

Beam centering

Before starting checking the beam (the profile with harp scans, its centering with the raster target or the C hole target, etc.) don't forget to turn OFF the DVCS calo HV, and also the HV on the VDCs. When ready for production don't forget to turn them back on.

BPM/Spot++ Check

  • After a period of 3 hours or more without beam (like beam study, pass change,...) ask MCC to run 5uA 2 by 2 rastered beam on the carbon hole target and make sure you can see the hole (use Spot++ to analyze the C hole run)