Difference between revisions of "Fall 2014 Commissioning Plan"

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(Beam Configuration Parameters)
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__TOC__
 
 
=General Information=
 
=General Information=
 
* Goals
 
* Goals
** Clean tune of the electron beam into the Tagger Dump
+
*# Clean tune of the electron beam into the Tagger Dump
** 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 at the endpoint
+
*#* 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
* Schedule and Hall Availability
+
* Schedule and Hall Availability: The accelerator run is scheduled for 19-Sep-14 - 22-Dec-14. 3 week are assigned for Hall D commissioning with photon beam (see [http://opsweb.acc.jlab.org/TJ3/12GeV_CEBAF/Fall2014.html]). The tentative plan is:
** Accelerator: beam recovery and 5.5 pass beam tune to the Tagger Dump (see [http://opsweb.acc.jlab.org/TJ3/12GeV_CEBAF/Fall2014.html]) are scheduled for Sept 19 - Oct 3. Tagger Hall and Hall D nominally closed.
+
*# Accelerator: beam recovery and 5.5 pass beam tune to the dumplette Sep 19-29. Hall D/Tagger are open.
** Oct. 4 - Oct. 9: Accelerator beam separation commissioning. Tagger Hall and Hall D open.  
+
*# Accelerator: electron beam tune to the Tagger Dump, 29-Sep-14 - 03-Oct-14. Hall D/Tagger are locked. TAGM and the electronics are removed from the Tagger Hall.
** 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.
+
*# Accelerator/Hall D: Photon beam tune to Hall D and the initial equipment checkout, Oct 4-5. Halls are locked.
 +
*# Hall D: Re-installation of the Tagger equipment (TAGM and the electronics), Oct 6-11. Halls are open.
 +
*# Hall D: Equipment commissioning with photon beam, Oct 12-31. Halls are locked.
 
* Expected Staffing:  
 
* Expected Staffing:  
 
** Run Coordinator: Alexandre Deur
 
** Run Coordinator: Alexandre Deur
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** Installation of diamond radiator in goniometer.
 
** Installation of diamond radiator in goniometer.
 
** Running at 1300A solenoid current.
 
** 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 &micro;A, duty cycle 1.5%, average current 60-150nA (see beam description [https://halldweb1.jlab.org/wiki/index.php/Tune_mode here])
 
** Photon beam operations: CW 50-200 nA
 
* Radiators:
 
** 1.5 &micro;m Al (1.7&middot;10<sup>-5</sup> R.L.)
 
** 10 &micro;m Al (11&middot;10<sup>-5</sup> R.L.)
 
** 30 &micro;m Al (34&middot;10<sup>-5</sup> 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 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 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.
 
 
=Run Plan=
 
==[[Tune Electron Beam]]==
 
 
==[[Tune Photon Beam]]==
 
==[[One Week Pause in Running]]==
 
==[[Collect Beam Data for Detector Checkout]]==
 
==[[Optimize Detector Settings]]==
 
==[[Drift Chamber Alignment]]==
 
==[[Collect More Regular Data]]==
 

Revision as of 19:29, 8 August 2014

General Information

  • Goals
    1. Clean tune of the electron beam into the Tagger Dump
    2. Commissioning of the unpolarized photon beam
    3. 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: The accelerator run is scheduled for 19-Sep-14 - 22-Dec-14. 3 week are assigned for Hall D commissioning with photon beam (see [1]). The tentative plan is:
    1. Accelerator: beam recovery and 5.5 pass beam tune to the dumplette Sep 19-29. Hall D/Tagger are open.
    2. Accelerator: electron beam tune to the Tagger Dump, 29-Sep-14 - 03-Oct-14. Hall D/Tagger are locked. TAGM and the electronics are removed from the Tagger Hall.
    3. Accelerator/Hall D: Photon beam tune to Hall D and the initial equipment checkout, Oct 4-5. Halls are locked.
    4. Hall D: Re-installation of the Tagger equipment (TAGM and the electronics), Oct 6-11. Halls are open.
    5. Hall D: Equipment commissioning with photon beam, Oct 12-31. Halls are locked.
  • 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:
  • 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.