User name R. Michaels
Log entry time 04:31:11 on July23,2004
Entry number 129359
keyword=septum magnet scan, ends in CHL crashScan of Septum Magnet Current on Left Arm. Start 0:50 7/23.
The L-arm dipole & quads are at their nom. setting p=2.971 GeV.
The R-arm remains at 2.960 throughout (only scan L-arm).
The R-arm data is considered production data.
Run .... Left Sept ....... det1/bcm1 ..... det2/bcm1.. (bcm1>10000)
....................... value ... % of peak
HAPPEX DAQ
3072 .. 193 Amps (setpoint) .. 0.049 .. 1.2% .. 0.012 ... 0.30 %
......... 193.25 (readback)
.......... -30%
3073 .... 234 (set) -15% ... 3.55 ... 85% ... 2.10 ... 52 %
3074 .... 253.5 (set) -8% .. 4.0 .... 95% ... 3.24 ... 80%
Based on what I've seen so far, and since it is taking a huge
amount of time to change the septum current, here is the
suggested run plan (unluckily not completed, see below):
HAPPEX DAQ: -70%, -50%, -30%, -15%, -8%, -4%, 0%, +15%, +25%
Spectr. DAQ: -70%, -50%, -30%, -8%, 0%
3075 .... 264.5 (set) -4% ... 4.14 ... 99 % ... 3.69 .. 91 %
3076 .... 275.5 (set) 0% ... 4.19 ... 100% ... 4.06 .. 100 %
3077 is a production run on R-arm while we ramp L-sept.
3078 .... 317 (set) +15% .... 0.72 ... 17 % ... 3.64 .. 90 %
3079 ... production while ramping L-arm
......... 345 (set) +25% .... 0.032 .. 0.8 % .. 1.61 .. 40 %
Beam goes away. CHL crash. MCC informs us it will be hours.
The septum was close to +25% at event 80K, so I cut >80K on
run 3079 to estimate the last point.
Note, there are good production runs on R-arm,
see above table.
Online plot below. Very curious.
Again, questions about pedestals (will check later).
FIGURE 1
