At 8:40PM Aug. 15 I made another change to data conditions
1) trigger switched to 2x2 APD (Ch2) at +15 mV threshold
2) Ch. 4 continues to have 200 MHz BWL but rest are at 1 GHz
3) Ch.1 is Mitch’s detector, Ch 3 is downstream 8x8 and Ch 4 is upstream
HV bias is 1804 V @ 1 microamp (so 1902 actual)
These seem to be clean data taking conditions and I won’t change anything until
this evening when I might raise bias by 1 volt.