User name R. Michaels
Log entry time 23:47:15 on June10,2004
Entry number 125294
Followups:
- 125303 06/11/04 00:58 R. Michaels Trig biases make alignment difficult
- 125308 06/11/04 01:54 R. Michaels funny amplitude dependence
The L-arm HAPPEX detector does not show up in the spectr. DAQ
so we can only check the R-arm. Run 1115. We go for 0.5 uA so
as not to draw much current in VDCs. Rates are
T1 = 430 kHz
T2 = 1.3 kHz
T3 = 380 kHz
T4 = 0
R-arm HAPPEX det HV = 1800. The HAPPEX detector ADC spectra looks
like fig 1. First I plotted the ADC spectra requiring a TDC hit, and
on top of that I required no TDC hit; this shows where the pedestal is.
Fig 2 shows the X-Y distribution of tracks, for
two conditions a) top plot with no cuts, and b) bottom plot
with HAPPEX detector above 1500 channels. My impression is it
is not well aligned, and I don't understand the structure yet,
although theories in the counting room abound.
FIGURE 1
FIGURE 2
