Difference between revisions of "Beam Recovery Procedure"

Revision as of 15:44, 6 May 2009

After beam study or other major down time

1. Move target to Empty position, let MCC restore the beam.
2. Move target to BeO/Optics, ask Raster OFF.
3. Then let MCC tune the beam to our nominal beam position (BPM values are on the white board) with low current (<2uA). On the monitor, verify the beam is hitting the center of the cross-hair marked on BeO target.
4. Move target to Empty position, ask MCC to do a Harp Scan, the beam profile should be within 100-200 um (both X and Y sigmas).
5. Move target back to BeO/Optics position, ask for 4x4 raster (6.5x6.5 MCC units) and 2 uA beam. Check BeO monitor one more time and do spot++ to check raster size.
6. Move target to He3 position, keep the 4x4 raster size. Ask for 2uA beam and compare the trigger rates (T1/T3/T5) with previous log (posted on the right side of the scaler monitor).
7. Keep 2uA beam, change raster size from 4x4 to 6x6 (9.8x9.8 MCC units), verify that there is no significant change in the trigger rates. Do spot++ to check raster size and any hot spot.
8. Once everything looks normal, change raster size back to 4x4 (6.5x6.5 MCC units). Ramp the beam to 10 uA and compare the trigger rates with previous log (also posted on the right side of the scaler monitor)..
9. Continue production.

After not very short beam down (>1hour)

1. Move target to BeO/Optics position, ask for 4x4 raster (6.5x6.5 MCC units) and 2 uA beam. On the monitor, verify the beam is hitting the center of the cross-hair marked on BeO target.and do spot++ to check raster size.
2. Move target to He3 position, keep the 4x4 raster size. Ask for 2uA beam and compare the trigger rates (T1/T3/T5) with previous log (posted on the right side of the scaler monitor).
3. Ramp the beam to 10 uA and compare the trigger rates with previous log (also posted on the right side of the scaler monitor)..
4. Continue production.