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User name Yi Qiang
Log entry time 21:24:47 on March 05, 2009
Entry number 264784
This entry is a followup to: 264782
Followups:
keyword=Readings for Reference cell
The reference cell temperatures are recorded to the data stream all the
time, however the gas type and pressure are not.
As for the pressure, because the temperature of the cell is depend on the
location and beam condition, the in beam pressure of the cell will be
slightly different (1~2%) from the pressure recorded in other conditions.
Among all these readings, the in-beam pressure is the most reliable one.
Also, keeping a manual log of gas type will give the one who sort out the
run list at the end a chance to cross check with the automatic run
information and rates.
As a Target operator, if he/she is not sure about the gas type in the
reference cell, by getting permission from RC, it's strongly recomended
to vent/vacuum the cell and fill the cell with proper gas.
Sorry that I didn't put these stuff into the TO check list, and I will
update the check list with these new information.
A copy of this log entry has been emailed to: brads, riordan