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User name R. Michaels
Log entry time 02:59:20 on April 3,2010
Entry number 315841
keyword=Optics runs on Ta for tune BShift crew : R. Michaels, J. Leacock, J. Wexler
Optics Runs for Tune B
Conditions :
Tantalum target
Raster Off
Sieve slits in
trigger T1 and T5 used on both HRS.
T1 = S0 A.and.B
T5 = upper scint
Initially P0 = 1.036. Septum remains 729 A setpoint throughout.
0:35 .... Ask for 2 uA
Rates at 2 uA
Left HRS
T1 = 38 kHz
T5 = 54 kHz
Right HRS
T1 = 68 kHz
T5 = 100 kHz
A note: Quads Q2 and Q3 were cycled earlier.
Septum has been "cycled" too (ramp to 800 then to 729)
0:40 ... Ask for 1 uA. (Better for VDCs)
Rates drop by factor of 2.
Runs 27240 / 6558 .... P0 = 1.063
Since we're going up in P0 next, we cycle Q2 and Q3.
Runs 27241 / 6559 .... P0 = 1.068 .... septum remains 729 A (set point)
Runs 27242 / 6560 .... P0 = 1.058 ..... waited long time for R-HRS to settle.
02:04 .... Noticed the R-HRS has a lot of "T7". Oops, ps7=10.
Whatever T7 is, it makes tracks and is mostly on near X=0,
perhaps a quartz detector. Warning: can cause mysterious shoulders.
Percentages of T7 were
run 6558 ... 3.9 %
run 6559 ... 0.5 %
run 6560 ... 58 % (sorry)
Putting ps7=65535 now.
Runs 27243 / 6561 .... P0 = 1.053
6562 is a repeat of same condition
Runs 27244 / 6563 .... P0 = 1.048
A note: When we started at P0 = 1.063 we had our usual 2:1 rate
asy for R:L-HRS. It's not due to clock. But now at P0=1.48 and
the previous P0 the asy has vanished.
L-HRS T1 = 25 kHz, T5 = 13 kHz
R-HRS T1 = 32 kHz, T5 = 13 kHz
Runs 27245 / 6564 .... P0 = 1.043
Fig 1 -- quality control check for P0 = 1.063 runs.
All runs checked.
FIGURE 1
