Difference between revisions of "Fall 2014 Commissioning Plan"
From Hall D Ops Wiki
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** Commissioning of the unpolarized photon beam | ** Commissioning of the unpolarized photon beam | ||
** Commissioning of the Hall D equipment under "soft" conditions: | ** Commissioning of the Hall D equipment under "soft" conditions: | ||
| − | *** low-intensity unpolarized photon beam <10 MHz/GeV | + | *** low-intensity unpolarized photon beam <10 MHz/GeV at the endpoint |
*** thin solid targets instead of the regular liquid hydrogen target | *** thin solid targets instead of the regular liquid hydrogen target | ||
*** solenoid current 1200 A instead of the nominal 1300 A | *** solenoid current 1200 A instead of the nominal 1300 A | ||
Revision as of 19:24, 5 August 2014
Contents
General Information
- Goals
- Commissioning of the unpolarized photon beam
- Commissioning of the Hall D equipment under "soft" conditions:
- low-intensity unpolarized photon beam <10 MHz/GeV at the endpoint
- thin solid targets instead of the regular liquid hydrogen target
- solenoid current 1200 A instead of the nominal 1300 A
- Schedule
- Accelerator: beam recovery and 5.5 pass beam tune to the Tagger Dump (see [1]) are scheduled for Sept 19 - Oct 3
- Photon beam tune and Hall D commissioning are scheduled for 3 weeks between 10-Oct and 22-Dec 2014 (tentatively 10-31 Oct)
- 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:
- 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.
- Activities postponed to the next run
- Installation of liquid hydrogen target.
- Installation of diamond radiator in goniometer.
- Running data at 1300A 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
