User name R. Michaels
Log entry time 15:10:00 on June13,2000
Entry number 43655
keyword=trigger strobe added to scaler
The trigger strobe was added as scaler data on both E-arm and H-arm.
This is the strobe used for the S-Ray MLU. It is expected to be the
dominant source of trigger deadtime, at a rate of about 10% per MHz.
On E-arm the channel is the 4th channel on the 5th scaler (the "normalization
scaler"). As usual, these data also appear on the 6th and 7th scaler bank
on E-arm, which are gated by the two helicities. On H-arm, the channel
is the 20th channel of the 5th bank (also the "normalization scaler"), as
well as on the 4th and 6th helicity gated scalers. Note, the H-arm scaler
has 32 channels. The xscaler display has been updated. One can see
typically 1.4-2.0 kHz for cosmics, which is the sum of 6 PMTs on S1-R
and 6 on S2-R.