Dear Collaborators,
It is necessary for me to elaborate about what I said in a recent
shift report where I voiced my discomfort about the state of detectors
in our experiment.
There was almost no immediate reaction to it, but recently an attempt to
trivialize my concerns call for a reply.
Whenever a new detectors starts acquiring data it is of utmost
importance to study its performance parameters, prototype studies are
usually done in clean controlled environments that do not account for
new developments that can be related to backgrounds, higher
multiplicities or just different manufacturing situations. New detectors
should be studied extensively in situ before data production starts.
Proportional counters should be studied thoroughly to find a parameter
region with the highest detection efficiency. Parameters for
proportional counters include:
amplification gain controlled most closely by anode high voltage,
amount of quencher in the gas mixture,
definition of drift voltages to guaranty that the cells do not have dead
regions,
discriminator threshold.
I suggested that these studies be done way at the beginning of the run.
The replies to my original shift report implied that there is no need to
worry because those studies are being conducted as we speak. That
reasoning is not correct. I would like the collaboration to adopt the
same standards that were used before the TPC were fully operational, but
all within a clear cut professional style. Lets not get into a shouting
match or rounds of sneering remarks.
Lets make sure all our detectors are working at the top of their
capabilities.
Ramiro
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