The shift leader has the following
responsabilities:
-
Communication:
-
With MCC: the shift leader answers the phone, and should be able to make
educated decisions about the beam and experimental conditions in general.
-
With the RC: the shift leader serves as information relay between MCC and
RC. He/she is also responsible for understanding and enforcing the RC's
instructions.
-
NEVER HESITATE TO CALL THE RC: IT IS BETTER TO ASK THAN TO DO SOMETHING
YOU ARE NOT SURE ABOUT.
-
Message logging:
-
At the end of his shift, the shift leader must submit a shift summary,
that carefully includes all experimental conditions for EVERY run (kinematics
settings, target, statistics,...). Clarity is appreciated: think about
the graduate student who will spend the next few months going through the
HALOG to analyze the experiment... Some good examples
can be found.
-
Additionally, during the shift, the shift leader should make an HALOG entry
about anything that happens, usual and unusual: if beam if lost for an
extended period of time, if a detector tripped, if the configuration changes,
... It is usefull that this is done "in real time" as it allows people
who are not in the counting house to follow the experiment closely.
-
Beam time is divided in 4 main categories:
-
ABU: Acceptable Beam in Use. This is what we want the most. This corresponds
to data taking, detector checkout time, beam line analysis,...
-
BNA: Beam Not Acceptable. This is what we want the least. Either there
is no beam, or the quality is too poor for our program (off centered, tripping
too often thus affecting target density,...) MCC has controlled
over that, but we should let them know EVERY TIME we can't accept
the beam because of its poor quality (sometimes it also helps to let them
know we are happy).
-
BANU: Beam Available Not in Use. This is what we can and want to minimize.
The beam is available, but we are not taking it because we are in Controlled
Access for repairs, or changing the configuration.
-
Accelerator. This corresponds to beam studies periods, scheduled in advance
with the RC. We must accept them.
There
is now an automated script that fills out the ABU table every hour,
detecting beam presence. However it is the shift leader's responsability
to correct the table. For example, if the current is up, but the beam is
off centered and the MCC is tuning to correct for it, the time should be
BNA, not ABU.
One hour before the end of each shift, the crew chief will call and ask
for ABU and BANU.
-
The shift leader, once a shift, should log the magnet screen, the beam
strip chart and the septa strip chart. This also needs to be done after
a configuration change. Some good examples
can be found.
-
Making sure required experimental
conditions are continuously met:
-
The shift leader ensures that the data are replayed, the shift checklist
is filled once a shift, the detectors are working properly,...
-
Safety
-
He/she is responsible for making sure procedures are followed in case a
Controlled Access is needed, in particular the Controlled Access checkout
list must be filled.