Difference between revisions of "PostTargetRecoveryRunPlan"
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== Beam Restoration == | == Beam Restoration == | ||
| + | # Do injector match check before restoring the beam | ||
# Target at Home position | # Target at Home position | ||
| − | # Establish tune beam and low current CW beam in the hall | + | # Establish tune beam and low current CW beam in the hall (straight through, empty target) |
# Design match to hall expected as part of original configuration | # Design match to hall expected as part of original configuration | ||
# Verify spot size at the target from harp trace | # Verify spot size at the target from harp trace | ||
# Once the low current beam is established, check target alignment <b>Before</b> the ion chamber calibration | # Once the low current beam is established, check target alignment <b>Before</b> the ion chamber calibration | ||
#* -> Go to <b>Low current checkout</b> #1 | #* -> Go to <b>Low current checkout</b> #1 | ||
| − | # Establish 30uA to dump, ion chamber calibrations to 30uA on Ca40, Carbon, Ca48. | + | # May have new target lock positions from the target alignment check |
| + | # Establish 30uA to dump, ion chamber calibrations to 30uA on Ca40, Carbon, Ca48. | ||
# Establish high current beam to dump with Carbon 1% | # Establish high current beam to dump with Carbon 1% | ||
| − | # Ramp current | + | # Ramp current in steps to 150uA on Ca40, check if the trip point makes sense |
#* this involves target burn-off | #* this involves target burn-off | ||
# If Yves is available, tune beam through Compton chicane | # If Yves is available, tune beam through Compton chicane | ||
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1. Target verification and raster check | 1. Target verification and raster check | ||
* Verify cold target positions and raster size | * Verify cold target positions and raster size | ||
| − | * Carbon hole, 1-2uA, 4x4 raster, turn ON S0 HVs | + | * Carbon hole, 1-2uA, 4x4 raster, turn ON S0 HVs |
* Take spot runs, verify the hole and 2x2 raster size (Carbon hole radius :2mm) | * Take spot runs, verify the hole and 2x2 raster size (Carbon hole radius :2mm) | ||
| + | * Compare with the previous C-hole center position. | ||
* If don't find the carbon hole, adjust BPM positions and raster size | * If don't find the carbon hole, adjust BPM positions and raster size | ||
* Move to Ca40, 4x4 raster, find the target center position (move beam to see the edge and estimate the center). Log it. | * Move to Ca40, 4x4 raster, find the target center position (move beam to see the edge and estimate the center). Log it. | ||
* Center beam to colimator center, 2x2 raster, verify nothing hitting edges, uniform distribution from spot runs | * Center beam to colimator center, 2x2 raster, verify nothing hitting edges, uniform distribution from spot runs | ||
* Move to Ca48, 4x4 raster, find the target center position. Log it. | * Move to Ca48, 4x4 raster, find the target center position. Log it. | ||
| − | *Center beam to collimator center, 2x2 raster, verify nothing hitting edges, uniform distributions from spot runs | + | * Center beam to collimator center, 2x2 raster, verify nothing hitting edges, uniform distributions from spot runs |
| + | * Adjust the target ladder to match the horizontal center to the collimator center (consult with Silviu, need to update encorder table before any further target movement) | ||
| + | * Provide the target positions to Yves, establish the new target lock positions if needed | ||
| + | 2. Detector alignment check: Devi, Ryan | ||
| + | * US and DS detectors to counting mode (done) | ||
| − | |||
| − | |||
| − | 3. Q2 measurement | + | 3. Q2 measurement: Chandan, Bob? |
* Check magnet setting is right | * Check magnet setting is right | ||
* Make sure VDC HVs OFF | * Make sure VDC HVs OFF | ||
| Line 51: | Line 56: | ||
* Verify the data while taking each run | * Verify the data while taking each run | ||
* Check if the ion chamber trip point is sensible | * Check if the ion chamber trip point is sensible | ||
| + | * Monitor the target! | ||
# Insert Ca40 target | # Insert Ca40 target | ||
#* 2x2 raster, run in steps of 30uA (each step for 1h) | #* 2x2 raster, run in steps of 30uA (each step for 1h) | ||
Revision as of 10:14, 23 January 2020
- Once the target cool down started and D. Meekins gives "Go", start ramping up HRS magnets
- Start with all detector HVs off
- Start a new fresh slug for the production to separate the data from the previous target
Beam Restoration
- Do injector match check before restoring the beam
- Target at Home position
- Establish tune beam and low current CW beam in the hall (straight through, empty target)
- Design match to hall expected as part of original configuration
- Verify spot size at the target from harp trace
- Once the low current beam is established, check target alignment Before the ion chamber calibration
- -> Go to Low current checkout #1
- May have new target lock positions from the target alignment check
- Establish 30uA to dump, ion chamber calibrations to 30uA on Ca40, Carbon, Ca48.
- Establish high current beam to dump with Carbon 1%
- Ramp current in steps to 150uA on Ca40, check if the trip point makes sense
- this involves target burn-off
- If Yves is available, tune beam through Compton chicane
- Do PQB check when we have beam in the hall
Low current checkout
1. Target verification and raster check
- Verify cold target positions and raster size
- Carbon hole, 1-2uA, 4x4 raster, turn ON S0 HVs
- Take spot runs, verify the hole and 2x2 raster size (Carbon hole radius :2mm)
- Compare with the previous C-hole center position.
- If don't find the carbon hole, adjust BPM positions and raster size
- Move to Ca40, 4x4 raster, find the target center position (move beam to see the edge and estimate the center). Log it.
- Center beam to colimator center, 2x2 raster, verify nothing hitting edges, uniform distribution from spot runs
- Move to Ca48, 4x4 raster, find the target center position. Log it.
- Center beam to collimator center, 2x2 raster, verify nothing hitting edges, uniform distributions from spot runs
- Adjust the target ladder to match the horizontal center to the collimator center (consult with Silviu, need to update encorder table before any further target movement)
- Provide the target positions to Yves, establish the new target lock positions if needed
2. Detector alignment check: Devi, Ryan
- US and DS detectors to counting mode (done)
3. Q2 measurement: Chandan, Bob?
- Check magnet setting is right
- Make sure VDC HVs OFF
- Beam centered at collimator, 2x2 raster
- Ask <1uA, adjust current to have S0 trigger rate ~100kHz to turn on VDC HVs
- Take 3M events
- Take escorted access to switch the detector mode before going to high current checkout
High current checkout
1. Low current BMW safety check: Victoria, Ye
- 10-15uA
2. Target burn-off
During this procedure,
- Verify the data while taking each run
- Check if the ion chamber trip point is sensible
- Monitor the target!
- Insert Ca40 target
- 2x2 raster, run in steps of 30uA (each step for 1h)
- Monitor detector yields and asym width
- Insert Ca48 target
- 2x2 raster, run in steps of 30uA (each step for 1h)
- Monitor detector yields and asym width
