Initial Beam Commissioning for the E158 Spectrometer
Shift schedule - first 6 shifts
David Relyea 2/4/1
for all shifts, take LOTS of pictures of the beam on profile monitors so we have a record of what happened
all initial shifts will include people doing spotsize work - this is implicit
Pre-shift one: beam onto slits, check out 3I1 and 3I10 for radiation safety purposes
for shift one or two, beam through 3I28 must be checked out by radiation physics. This will be solely parasitic.
make sure all targets are out, all magnets are off, and that DAQ is running smoothly. Ray Arnold/Peter Bosted/ David Relyea should be around. Ted Fieguth (or someone who understands the A-line) should also be around
ask MCC for beam at 1 Hz, 3E9/spill, short pulse, 45.?? (magic precession number) GeV
Move 3PR1, 3PR3, and 3PR4 into position. If beam is visible on 3PR4, rejoice.
talk with MCC and center beam on 3PR1 using correctors A28, A29, A32, and A33. Move 3PR1 out.
Move 3PR2 in, center beam on it (ditto). Move 3PR2 out.
if there's a large signal on the bad spill monitor, move beam around until there isn't one. If it appears something is out of alignment in the alcove of upstream, think.
See if beam is visible on 3PR3. If not, steer beam around a little to see if beam shows up on 3PR3. If it does, document misalignments of screens and/or 3DC2C.
If beam doesn't show up on 3PR3, 3DC3 might be completely misaligned. Look at SEM signals to determine if this is the case (recenter beam as it was on 3PR1 and 2, then look to see if there's a signal on SEM3).
If 3DC3 is misaligned, determine how badly, and ask for an access to adjust it.
Again need Ray Arnold/Peter Bosted/David Relyea and Ted Fieguth/A-line guru
Center beam on 3PR3, and then on 3PR4. Leave 3PR4 in.
If 3DC3 isn't grossly misaligned, steer beam around to find the apertures in 3DC2C and 3DC3. (who understands the A-line optics? Is there a MKB for beam position and angle on target? If not, do we commission BPMs and target feedback first, and then do the following?) If everything looks well-aligned, steer beam so that it passes through the center of 3DC2C and the center of 3PR4. This is now "beam axis", and assuming the beam isn't too far off-center in the target, we now have usable beam.
If 3DC3 is misaligned, Peter/Ray/David must figure out how best (making the fewest accesses) to adjust 3DC3 to align it with 3DC2C.
sometime between now and the end of shift four, run beam onto 3C1 at 300 W to test 3IC1A and 3IC1B
requires Yury, Ted/A-line person, Piotr
Turn beam up to 10 Hz.
Commission the A line BPMs and target feedback, and the detectors. (need details here)
Turn the beam down to 1 Hz. Get Peter/Ray/Dave.
Recheck the beam centering on 3DC2C and 3DC3 by steering it around again. Once the beam is back in position, turn it up to 10 Hz, and record the beam position with the BPMs.
Turn on target feedback.
Turn on and off, or ramp up and down, all quads (A-line and spectrometer) to assure beam is centered (use 3PR4 to view beam). Whom do we need? (Roger, Ted, Howard...)
if it hasn't been done by now, run beam onto 3C1 at 300 W to test 3IC1A and 3IC1B
turn beam off
turn 3D3 on just a tiny bit and see which way the beam deflects on 3PR3
if it deflects correctly, turn 3D1, 3D2, 3D3 to nominal settings (Peter or Dave should be around)
read out NMR for all three dipoles. If there's a discrepancy between an NMR value and a dipole HV level, note it.
beam on at 1 Hz.
If the beam isn't visible on 3PR4, we have a problem. Steer beam around a little with D3. If beam doesn't become visible, stop beam and convene.
If beam isn't centered on 3PR3 and 3PR4, adjust whichever magnet had a discrepancy between its NMR value and its HV. If no magnets had any discrepancies and the beam is off by just a little, adjust 3D3 until it is centered. Then bring 3D3 back to its original value and adjust 3D2 until beam is centered on 3PR3 and 3PR4. Attempt to figure out which dipole's measurement (both NMR and the current) is wrong. Once that's done, center beam on 3PR3 and 3PR4
Using D3, steer beam (at 50 W) onto 3LMC to test 3IC8A and 3IC8B
Turn beam up to 10 Hz
DAQ checkout - running, storage (O. Saxton)
analysis checkout - displays, analysis (Y. Kolomensky)
good spill monitor (R. Arnold)
cavity BPMs (Y. Kolomensky, K. Bega)
A-line toroids (Y. Kolomensky, K. Bega)
target (C. Arroyo)
SEM3 (position 3DC3) (T. Fieguth)
Detectors (Syracuse, UMass)
magnet feedback (P. Bosted)
wire array (R. Arnold)
calibrate ion chambers
calibrate SEM2 (3DC2C)
MPS checkout (machine protection system) (T. Fieguth? what devices?)
BCS checkout (beam containment system) (who, and what devices?)
PPS checkout (personnel protection system) (who, and what devices?)