Difference between revisions of "Tune Electron Beam"

Revision as of 07:38, 21 October 2014

• Goal: provide a clean electron beam through the center of the beam aperture to the beam dump in the tagger hall with acceptable radiation levels.
• Priority: High
• Link to the accelerator test plan for electron beam commissioning (ATLIS)
• Expected duration:

1. 4 days: Tune beam to Hall D line dumplette (Tagger Hall can remain open).
2. 3 days: Tune beam to Tagger Hall D (Tagger Hall and Hall D must be closed).

• Prerequisites:

1. Tagger microscope (TAGM) and all the crates with electronics removed from Hall D. ☑
2. Goniometer in the beam-open position. The goniometer will not be used during the 2014 run. ☑
3. Amorphous radiator ladder equipped and operational ☑
   • Responsibility: Hovanes Egiyan.
4. Beam lines under vacuum ☑
5. Tagger magnet operational ☑
   • Responsibility: MCC
6. Shielding walls installed ☑
7. Radiation monitors installed and operational ☑
   • Responsibility: Alexandre Deur (CARMS)/Hovanes Egyian (halo counters)
   • Procedure to monitor CARMs
8. Upstream Profiler installed in front of the collimator ☑
9. Downstream Profiler installed in front of photon beam dump ☑

• Conditions:

1. Pulsed beam pulsed beam 4-10 µA (average 60-150 nA) for the beam tune
2. CW beam 50-100 nA at the final stage of the procedure
3. Primary collimator block in the position between two holes, shielding the central area of the beam pipe . Secondary collimator removed. ☑
   • Responsibility: Hovanes Egiyan.
   • Procedure for moving Primary Collimator
4. Vacuum window covers removed (7 window covers)
5. No radiator inserted.
   • Responsibility: Hovanes Egiyan.
   • Procedure for inserting/removing amorphous radiators
6. No shift workers in Hall D except if needed. RC and/or other Hall D personnel follows the beam tuning procedure at the MCC.

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