Difference between revisions of "Fall 2014 Commissioning Plan"

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(General Information)
(General Information)
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This document describes the run plan and procedures for the Hall D Fall 2014 commissioning.  
 
This document describes the run plan and procedures for the Hall D Fall 2014 commissioning.  
  
<span style="color:#ff00ff">Items in red indicate missing information. </span>
+
<span style="color:#ff00ff">Items in pink indicate missing information. </span>
  
 
* Goals
 
* Goals

Revision as of 15:28, 13 August 2014

This page gives the run plan for the Fall 2014 commissioning. It is a controlled document that can be edited only by E. Chudakov, E. Smith or A. Deur. Suggestions and comments should be send to them.

General Information

This document describes the run plan and procedures for the Hall D Fall 2014 commissioning.

Items in pink indicate missing 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.

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.
    • Al. cross made of 1.5mm diameter wires
    • 1cm long Al. cylinder with an equilateral triangle hole inside. The triangle edge lengths are 2.5 cm.

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