User name R. Michaels
Log entry time 11:00:10 on October 1,2000
Entry number 48882
Followups:
- 48892 10/01/00 11:42 R. Michaels bad paddle (correction)
- 49060 10/02/00 13:26 R. Michaels T2, T4 control
Problems noted:
1. VDCs on both spectrometers have a secondary TDC peak at
large TDC values; it might be caused by after-pulsing on PMTs (?)
See figure below.
2. Trigger T2 is bizarre. It has lots of events with VDC hits but also
lots event with neither S1 nor S2. Both T2 and T4 triggers need to
be checked with a scope (it requires an access).
3. Mark Jones noted a hole (inefficiency) in the momentum spectrum
on right spectrometer; it seems to be around paddle 5 or 6.
The ADC amplitudes look big enough, so its probably not a
HV problem. He is studying it.
FIGURE 1
