This file: cdaq@cdaqs1:~/gen/Documents/leakage.txt
Marko Zeier Nov 01

To measure beam current leakage from Hall A we measure HMS
pretrigger rates for three different situations:
   A: Hall C and Hall A laser on, nominal currents (normal operation)
   B: Hall C laser off, nominal Hall A current,
   C: C slit closed (background measurement) 

      leakage = (B-C)/(A-C)

Mesurement of HMS rates:

1) open xterm as cdaq on cdaqs1

2) type in xterm: cd gen/tcl

3) type in xterm: ./record_leakage.pl  [<num>]

4) to end script use: Ctrl-C

The script reads HMS rates via a scaler server and beam currents
from epics every two seconds. Normally you don't need to start a
run for that. It averages HMS rates and currents
over the last <num> reads (default is 10). The screen out put is
also written to a file: record_leakage.out
It gets overwritten every time you restart the script.

In an hclog entry write down the rates and beam currents for the
three situations and the leakage. Quote errors.

If the leakage is significantly larger than 1% ask the
operators to reduce it.


Troubles:
=========

"CLOCK IS NOT RUNNING" indicates that the scaler server is not
updating. It probably got turned off by the DAQ. Just start a
run.
If this doesn't help reboot ROC9.