Make New Entry, Make Followup Entry
User name R. Michaels
Log entry time 15:43:21 on September 4,2009
Entry number 287999
keyword=Beam current scanSlight change of plans now that rates make sense.
Will do a ramp of curent with LH2 target .
Turn off VDCs.
taking data to record scalers.
Runs 24652 / 4461.
Runs 24653 / 4462
Put PS2 = 50 on both HRS to make scaler events less spare
Will ramp up beam current slowly
Below the raw R-HRS is mult. by 4 but will need to be analyzed
offline to be accurate.
Event interval ..... Beam current .... L-HRS Rate ... R-HRS Rate
.... 0 - 10K ...... 0.5 uA ....... 3250 Hz ..... 2600 Hz
.... 12 - 30K ..... 1.0 uA ....... 7.4 kHz ..... 7.2 kHz
..... 45K - 70K ... 2.0 ......... 14 kHz ...... 14 kHz
..... ~100K ........ 4.0 ......... 25.2 kHz ..... 22.8 kHz
..... ~160K ........ 6.0 uA ...... 40K .......... 36 kHz
...... ~200K ... ret. to 1.0 uA ... 7.0 kHz ..... 6.8 kHz
A rough online plot of scalers in datastream is in fig 1.
More notes about scaler rates
1. Two DAQ rates agree, but staturate at 2.3 kHz
2. 100 kHz clock (redundant) unfortunately not plugged in
on R-HRS, but it's there on L-HRS. Need to fix next access.
FIGURE 1
