Log entry time 04:34:09 on October19,2005

Entry number 157376

Rob is here and requests that we switch from the HAPPEX DAQ to the Spectrometer DAQ so that he can do an alignment check.  This was recommended by Bob b/c the right HRS has been down for the last few days.                                                                 



0012    checked operation of Spec DAQ by running spot++, run 2872     0014    called MCC and requested beam current of 1 µA, got 1.2  0016    recorded and changed HAPPEX detector HV                                                                                             left                    old (set V)     new (set V)                   5th PR, ch 8            -1390           -1900                         5th PR, ch 9            -1490           -1900                                                                                               right                   old (set V)     new (set V)                   S2 1-10 Left, ch 10     -1395           -1900                         S2 1-10 Left, ch 11     -1465           -1900                                                                                              0020    switched cable from HAPPEX → HRS                         0022    checked beam position at 1.2 µA, Rob says they look OK  0024    turned on HV for scintillators, S0 and S2 only for both arms  0026    checked xscaler @ 1.2 µA                                0028    request beam current to 0.2 µA, got 0.24                                                                                      xscaler         1.194 µA;  0.241 µA  ρ = 4.95          T1   686 kHz         151 kHz         4.54                  T2   556 kHz         117 kHz         4.75                  T3   648 kHz         142 kHz         4.56                 T4   554 kHz         118 kHz         4.69                                                                                        0032    set VDCs to 4.0 kV, automatically ramping up at about 1kV/min 0037    VDCs reach 4.0 kV                                             0039    start SPEC DAQ run 2873                                      0051    3873 ended, backing out of SPEC DAQ mode                     0100    VDC's off                                                     0102    beam current spiked to 11.1 µA for about 30 sec, see HALOG 15735

0110	Rob takes a few SPEC DAQ runs to verify integrity of detectors

0116    S2/S0 HV off, left and right top                              0117    checked other detector HV settings, Rob unplugged cable       0119    resetting HAPPEX detectors HV                                                                                                    left                    old (set V)     new (set V)           

5th PR, ch 8            -1900           -1390                         5th PR, ch 9            -1900           -1490



right                   old (set V)     new (set V)

S2 1-10 Left, ch 10     -1900           -1395

S2 1-10 Left, ch 11     -1900           -1465



0122    ask for position feedback off and 10 µA beam to see if the beam drifted before and after the alignment test



time    00:29           0102                    0127

BPM     before (mm)     during spike (mm)       after (mm)

1H04A.X +1.55           +1.60                   +1.60

1H04A.Y +0.10           +0.07                   +0.10

1H04B.X -1.41           -1.40                   -1.37

1H04B.y +0.26           +0.21 to +0.39          +0.40



0133    ask for 58 µA with position feedback on



figure 1. beam position strip

figure 2. HV for Left and Right Top








FIGURE 1 




FIGURE 2