View source for How to recover BPM positions after llong beam trip

'''Follow this procedure only if beam is down for more than 2 hours or if there are any tune changes (ask MCC if in doubt)'''

# When beam is back, check to see if the beam positions are back to previous good BPM values.
# Move to 12C (carbon hole) target
# Ask MCC to turn OFF fast raster and tell them you are going to turn ON slow raster (50nA).
# Change slow raster size to 1.4 cm (1.1 volts on function generator)
# Center 12C hole by changing BPMs if necessary
## Do spot_L and spot_3
## X and Y on the spot_L/spot_3 are same as beam except Y axis is reversed.
## Halog all raster plots 
# If 12C hole is centered. Note down the BPM values and move to 12C-40 target
# Ask MCC to turn ON fast raster and increase the slow raster size to 2cm (1.45 volts)
## Do spot_L and spot_3
## If beam hits something, then decrease the slow raster size to 1.8cm
## Halog all raster plots 
# If raster pattern looks good (no hotspots) on 12C-40 then move to NH3 production target
## Do spot_L and spot_3
## Halog all raster plots 
# Check 3rd arm trigger rates. For 2.2 GeV beam with 50nA on NH3 target the rate should be 2-3 KHz and DT < 20%
## If rates on 3rd arm are very high and DT >> 20% , call RC.
## Otherwise you are all set for production!