Make New Entry, Make Followup Entry
User name Bob / Dustin
Log entry time 21:03:38 on September23,2009
Entry number 291246
keyword=spectrometer DAQ runsDid the checklist to switch to counting mode.
S0 on, VDC on.
Carbon holey target.
10 uA.
Rates are
L-HRS T1 = 3.3 kHz
L-HRS S0-T2 = 4.2 kHz
R-HRS T1 = 3.6 kHz
R-HRS T2 = 5.1 kHz
Run 24827 / 4612.
With prescale=4 the deadtime on L-HRS is horrible.
Reason: huge hit multiplicity in ROC4.
Tried dropping TDC in slot 19. Didn't help. Run 24828
Realized the FADC was turned on. Turned it off. Put back
the TDC in slot 19. Run 24829. Deadtime now zero !
(ps2=4 and 4.3 kHz input, 1.1 kHz observed).
Fig 1 = spot++ for run 24829.
Hole exists. Ok, redundant post.
FIGURE 1
FIGURE 2
