Smoothing/C0 shunt commissioning procedure
- Reload TOP file 15.
- Next zero out the ramps for HB49 and HC11.
- Inject beam and abort first turn. The reference P1 line flash is in
I39 file 581. Once the P1 line matches the reference, the Tevatron first
turn should look pretty good up to A0. If this does look good, set the
abort to 2nd turn.
- The first place to expect trouble is B0 where shielding was stacked.
We may have to do some one bumping with VA49 and HA49 to get the orbit right
downstream of B0.
- The next place to expect trouble is C0. The initial value of the
shunt at 150 GeV should be 35.2 amps. We should adjust T:C0SH to get the
horizontal trajectory correct downstream of C0. Change the shunt by up
to 5 amps to get the orbit correct. If we need more change than that, we
should use the regular correction elements to fix the orbit. For
reference, a 2 amp change on the shunt should produce an orbit oscillation of
1 mm at 150 GeV, and positive current on the shunt will bend the beam to the
radial outside.
- After the 150 GeV value is set for the shunt, use
Mike Martens procedure
for smoothing the orbit at 150 GeV.
- Copy the DFG settings up the ramp. At flattop, use Mike's procedure
for smoothing the orbit, but don't send the changes. Instead, take the
corrections suggested for HB49 and HC11 and convert them into a change for
T:C0SH. Add the corrections for HB49 and HC11 together. For
every +.001 mrad of correction requested, subtract 2 amps on the
shunt. Don't change the shunt by more than 30 amps.
- Interpolate the changes made at 150 GeV, and the changes made at flattop
to the other ramp slots on T:C0SH.
- After the shunt has been changed, smooth using Mike's smoothing procedure.
Flattop can be smoothed after the shunt has been set, but the intermediate
ramp slots will require another cycle with the new shunt settings.