Fall 2014 Commissioning Plan

General Information

• Beam tests are scheduled for 3 weeks between 10-Oct and 15-Dec 2014
• Expected Staffing:
  • Run Coordinator: Alexandre Deur
  • Online Shifts: 3 persons per shift, one with solenoid training.
  • Offline Shifts: at least two people looking at data written to tape.
• Coordination Activities:
  • MCC meetings at 7:50am and 8:00am
  • Daily run meeting broadcast on bluejeans 10:30am?? Meeting will be in the counting house conference room.
  • Links to accelerator schedules:
    • CEBAF 12 GeV Commissioning calendar
    • Scheduled Accelerator Down (SAD)/Maintenance Calendar
    • http://accboard.acc.jlab.org/
• Activity Priority
  • High: Activity should be completed, contingencies in place for issues.
  • Medium: Desirable to complete the activity.
  • Low: Activity would be useful if time permits us to do it.
• Deferred Activity
  • Installation of liquid hydrogen target.
  • Installation of diamond radiator in goniometer.
  • Running data at 1350A solenoid current.

Beam Configuration Parameters

• Energy of Beam. Expect energy ~ 10.5 GeV
• Beam current
  • 2-10 µA pulsed beam, duty cycle 1.5% (see beam description here)
  • 50-200 nA CW
• Radiators
  • 1.5 microns Al (1.7·10^-5 R.L.)
  • 10 microns Al (11.·10^-5 R.L.)
  • 30 microns Al (34.·10^-5 R.L.)
• Targets. Diameter = 3.19 cm. The position of the target can be moved 12 cm downstream to 32 cm upstream relative to the nominal Hall D target position (60 cm downstream of the downstream end of the upstream solenoid endcap.)
  • 10mm thick disk of CH₂ (HDPE, high density polyethylene, density 0.93-0.97 g/cm³ )
  • 2mm thick disk CH₂ (HDPE)
  • 2mm thick for the 2mm-inner diameter and 7mm thick outside (HDPE)
  • 3.4mm thick graphite disk
• Run schedule. Scheduled about 4 weeks of beam to Hall D between mid Oct and mid Dec, 2014