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#### Entry number 285164

keyword=PREX-like tune for HRS

The PREX tune won't work with the HRS (There is no PREX magnet. The
distances are different.etc.). As per my earlier discussion with Kent,
I've concocted an equivalent tune for the right hrs that should be
approximately equivalent to the PREX tune. This tune will give you
x|theta~0, y|phi~0, and D/M~-4 60 cm behind the VDC. D/M for the PREX
tune is somewhat better, -5.5, but getting that right will take a lot
more time and doesn't seem worth it.
You'll have to set it up by hand, however.
Set the dipole the same as always, just type in P0 and wait.
Turn off the regulation for each quad and set the currents using the
following prescription.
Q1 dI/dp=901.212 (Amps/GeV/c)
Q2 dI/dp=522.9513 (Amps/GeV/c)
Q3 dI/dp=446.977 (Amps/GeV/c)

For each quad multiply its dI/dp by the central momentum value you want
(in GeV/c) and the result is the current for that quad (in Amps). Rules
regarding quad cycling still apply (in principle at least).

For example if you wanted 1.1 GeV/c then the result for the magnets
would be as follows:
Q1: I= 901.212 x 1.1 = 991.33 Amps
Q2: I= 522.9513 x 1.1= 575.25 Amps
Q3: I= 446.977 x 1.1 = 491.67 Amps

Good Luck!
-JJL
Your best bet for contacting me between Monday and next Thursday is my
cell phone (757 810-6784)