Difference between revisions of "Fall 2014 Commissioning Plan"
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** 10mm thick disk of CH<sub>2</sub> (HDPE, high density polyethylene, density 0.93-0.97 g/cm<sup>3</sup> ), 0.95 g/cm<sup>2</sup>, ~1.2% R.L. | ** 10mm thick disk of CH<sub>2</sub> (HDPE, high density polyethylene, density 0.93-0.97 g/cm<sup>3</sup> ), 0.95 g/cm<sup>2</sup>, ~1.2% R.L. | ||
** 2mm thick disk CH<sub>2</sub> (HDPE) | ** 2mm thick disk CH<sub>2</sub> (HDPE) | ||
| − | ** 2mm thick inside a | + | ** 2mm thick inside a 20mm diameter area and 7mm thick outside (HDPE) |
** 3.4mm thick graphite disk, 0.75 g/cm<sup>2</sup>, 1.8% R.L. | ** 3.4mm thick graphite disk, 0.75 g/cm<sup>2</sup>, 1.8% R.L. | ||
Revision as of 17:30, 7 August 2014
Contents
General Information
- Goals
- Clean tune of the electron beam into the Tagger Dump
- 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 and Hall Availability
- Accelerator: beam recovery and 5.5 pass beam tune to the Tagger Dump (see [1]) are scheduled for Sept 19 - Oct 3. Tagger Hall and Hall D nominally closed.
- Oct. 4 - Oct. 9: Accelerator beam separation commissioning. Tagger Hall and Hall D open.
- Photon beam tune and Hall D commissioning are scheduled for 3 weeks between 10-Oct and 22-Dec 2014 (tentatively 10-31 Oct) Hall D closed during the 3 weeks.
- 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 planned for the next run in Spring 2015:
- Installation of liquid hydrogen target.
- Installation of diamond radiator in goniometer.
- Running at 1300A solenoid current.
Beam Configuration Parameters
- Energy of Beam: expected ~ 10.5 GeV
- Beam current:
- Electron beam tuning is done with pulsed beam 4-10 µA, duty cycle 1.5%, average current 60-150nA (see beam description here)
- Photon beam operations: CW 50-200 nA
- Radiators:
- 1.5 µm Al (1.7·10-5 R.L.)
- 10 µm Al (11·10-5 R.L.)
- 30 µm Al (34·10-5 R.L.)
- Collimator hole: 5 mm diameter
- 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 ), 0.95 g/cm2, ~1.2% R.L.
- 2mm thick disk CH2 (HDPE)
- 2mm thick inside a 20mm diameter area and 7mm thick outside (HDPE)
- 3.4mm thick graphite disk, 0.75 g/cm2, 1.8% R.L.
