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 | |
| + | # 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 | ||
| − | # Before the ion chamber calibration | + | # Once the low current beam is established, check target alignment <b>Before</b> the ion chamber calibration |
| − | # ion chamber | + | #* -> Go to <b>Low current checkout</b> #1 |
| − | # Ramp current | + | # 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 | #* this involves target burn-off | ||
# If Yves is available, tune beam through Compton chicane | # If Yves is available, tune beam through Compton chicane | ||
| Line 18: | Line 22: | ||
== Low current checkout== | == Low current checkout== | ||
| − | 1. Target verification and raster check | + | Bob, Chandan, Devi, Silviu, |
| + | |||
| + | 1. Target verification and raster check: | ||
* Verify cold target positions and raster size | * Verify cold target positions and raster size | ||
| − | * Carbon hole, 1-2uA, | + | * Carbon hole, 1-2uA, 4x4 raster, turn ON S0 HVs |
| − | * Take spot runs, verify the hole and 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: | |
* Check magnet setting is right | * Check magnet setting is right | ||
| − | * Beam centered at collimator, 2x2 raster | + | * Make sure VDC HVs OFF |
| + | * Beam centered at collimator (if there is new target lock position use that), 2x2 raster | ||
* Ask <1uA, adjust current to have S0 trigger rate ~100kHz to turn on VDC HVs | * Ask <1uA, adjust current to have S0 trigger rate ~100kHz to turn on VDC HVs | ||
| − | * Take 3M events | + | * Take 3M events |
| + | * Take escorted access to switch the detector mode before going to high current checkout | ||
| + | * Turn off all HVs, make sure to adjust the quartz HVs for integrating mode | ||
== High current checkout == | == High current checkout == | ||
| − | 1. Target burn-off | + | 1. Low current BMW safety check: Ye (Victorian if it happens during owl) |
| − | + | * 10-15uA | |
| − | + | ||
| − | + | 2. Target burn-off: Shifter, Cameron (Silviu) <br> | |
| − | + | During this procedure, | |
* 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 | ||
| + | #* 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 | ||
Latest revision as of 16:13, 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
Bob, Chandan, Devi, Silviu,
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:
- Check magnet setting is right
- Make sure VDC HVs OFF
- Beam centered at collimator (if there is new target lock position use that), 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
- Turn off all HVs, make sure to adjust the quartz HVs for integrating mode
High current checkout
1. Low current BMW safety check: Ye (Victorian if it happens during owl)
- 10-15uA
2. Target burn-off: Shifter, Cameron (Silviu)
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
