Difference between revisions of "Tune Electron Beam"
From Hall D Ops Wiki
(→Tune Electron Beam (Time estimate: 15 days)) |
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# Sept 29 - Oct 3 2014: Tune beam to Tagger Hall D (Tagger Hall and Hall D must be closed). | # Sept 29 - Oct 3 2014: Tune beam to Tagger Hall D (Tagger Hall and Hall D must be closed). | ||
* Prerequisites: | * Prerequisites: | ||
| − | # Tagger microscope (TAGM) and all the crates with electronics | + | # Tagger microscope (TAGM) and all the crates with electronics removed from Hall D. <math>\Box</math> |
| − | + | ||
# Goniometer in the beam-open position. The goniometer will not be used during the 2014 run. <span style="font-size:21px">☑</span> | # Goniometer in the beam-open position. The goniometer will not be used during the 2014 run. <span style="font-size:21px">☑</span> | ||
| − | # Amorphous radiator ladder equipped (HARP included) and operational | + | # Amorphous radiator ladder equipped (HARP included) and operational <math>\Box</math> |
| − | + | #* Responsibility: Hovanes Egiyan. | |
#* <span style="color:#ff00ff">Procedure for radiator harp scans </span> | #* <span style="color:#ff00ff">Procedure for radiator harp scans </span> | ||
| − | # Beam lines under vacuum | + | # Beam lines under vacuum <math>\Box</math> |
| − | # Tagger magnet operational | + | # Tagger magnet operational <math>\Box</math> |
| − | # Shielding walls installed | + | #* Responsibility: MCC |
| − | # Radiation monitors installed and operational | + | # Shielding walls installed <math>\Box</math> |
| − | # Primary collimator block in the position between two holes, shielding the central area of the beam pipe. Secondary collimator removed. | + | # Radiation monitors installed and operational <math>\Box</math> |
| − | # Profiler counter installed in front of the collimator | + | #* Responsibility: Alexandre Deur (CARMS)/Hovanes Egyian (halo counters) |
| + | #* <span style="color:#ff00ff">Procedure to monitor CARMs </span> | ||
| + | #* <span style="color:#ff00ff">Procedure to Halo counters </span> | ||
| + | # Primary collimator block in the position between two holes, shielding the central area of the beam pipe <math>\Box</math>. Secondary collimator removed. <span style="font-size:21px">☑</span> | ||
| + | #* Responsibility: Hovanes Egiyan. | ||
| + | #* <span style="color:#ff00ff">Procedure for moving Primary Collimator </span> | ||
| + | # First Profiler counter installed in front of the collimator <math>\Box</math> | ||
| + | # Second Profiler counter installed in front of photon beam dump <math>\Box</math> | ||
* Conditions: | * Conditions: | ||
# Pulsed beam [https://halldweb1.jlab.org/wiki/index.php/Tune_mode pulsed beam] 4-10 µA (average 60-150 nA) for the beam tune | # Pulsed beam [https://halldweb1.jlab.org/wiki/index.php/Tune_mode pulsed beam] 4-10 µA (average 60-150 nA) for the beam tune | ||
# CW beam 50-100 nA at the final stage of the procedure | # CW beam 50-100 nA at the final stage of the procedure | ||
| − | # No radiator | + | # No radiator inserted. <math>\Box</math> |
| − | # Hall D quadrupole | + | #* Responsibility: Hovanes Egiyan. |
| − | # | + | #* <span style="color:#ff00ff">Procedure for inserting amorphous radiator </span> |
| − | # No shift workers in Hall D | + | # Hall D controlled quadrupole MQPAD00 turned off. <math>\Box</math> |
| + | #* Responsibility: MCC | ||
| + | # No shift workers in Hall D except for Shift leader if needed and experts from Hall D are involved with the radiation measurements | ||
* Activities: | * Activities: | ||
Revision as of 10:53, 14 August 2014
Contents
Main Page
Tune Electron Beam (Time estimate: 15 days)
- 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:
- Sept 19 - Sept 29: Tune beam to Hall D line dumplette (Tagger Hall can remain open).
- Sept 29 - Oct 3 2014: Tune beam to Tagger Hall D (Tagger Hall and Hall D must be closed).
- Prerequisites:
- Tagger microscope (TAGM) and all the crates with electronics removed from Hall D.
- Goniometer in the beam-open position. The goniometer will not be used during the 2014 run. ☑
- Amorphous radiator ladder equipped (HARP included) and operational
- Responsibility: Hovanes Egiyan.
- Procedure for radiator harp scans
- Beam lines under vacuum
- Tagger magnet operational
- Responsibility: MCC
- Shielding walls installed
- Radiation monitors installed and operational
- Responsibility: Alexandre Deur (CARMS)/Hovanes Egyian (halo counters)
- Procedure to monitor CARMs
- Procedure to Halo counters
- 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
- First Profiler counter installed in front of the collimator
- Second Profiler counter installed in front of photon beam dump
- Conditions:
- Pulsed beam pulsed beam 4-10 µA (average 60-150 nA) for the beam tune
- CW beam 50-100 nA at the final stage of the procedure
- No radiator inserted.
- Responsibility: Hovanes Egiyan.
- Procedure for inserting amorphous radiator
- Hall D controlled quadrupole MQPAD00 turned off.
- Responsibility: MCC
- No shift workers in Hall D except for Shift leader if needed and experts from Hall D are involved with the radiation measurements
- Activities:
- Tune the pulsed beam to the dump, check the beam specifications, send the CW beam (accelerator).
- Check radiation levels in the tagger hall (Hall D/RadCon).
- Check for photons (with the Profiler and Active Collimator) and radiation levels in the collimator cave (Hall D/RadCon).
- Responsibility: Main: Accelerator; support: HallD, RadCon.
