Log entry time 22:20:04 on January29,2008

Entry number 227957

Followups:

• 227970 01/30/08 00:04 D. Parno No Correlation Between FADC Accumulators and Time
• 227978 01/30/08 00:44 D. Parno Accumulators Correlated with Beam Current

Accumulator histograms for a 50,000 event integration mode run with DAC offset 
set to minimize accdiff. Run number = #60317.

Fig. 1: Histograms of Entire Accumulators
Fig. 2: Blue histogram = accumulator values with laser cavity on. Black 
histogram = accumulator values with laser cavity off.

A reminder of what each accumulator means. Thr1 is near pedestal, Thr2 is 
cutoff for big pulses.

acc1: Integrate everything; no thresholds.

acc2: Integrate everything above Thr1 (near pedestal)

acc3: Integrate everything between Thr1 and Thr2 (Compton events).

acc4: Integrate everything below Thr2 (big pulses)

acc5: Integrate everything below Thr1 (plus some number of pulses to get the 
tails) that is not included in acc6.

acc6: Integrate everything below Thr2, plus some number of pulses to get the 
tails.

For this run, Thr1 was set at 1925 and Thr2 at 930.