Instructions for running the high pt chambers

Responsible for this sheet: V. Popov, e-mail:popovvp@mail.desy.de, phone: 3345


On-call expert

What to do if the expert is not reachable

Attempt to contact the subsystem coordinator.


Contents


What to do if there is an HV alarm

There are 2 separate HV systems: one for inner high-pt (gas pixel chambers) and one for outer high-pt (straw tubes). The inner high-pt system is stable; the outer high-pt system has recently been introduced into the slow control. If you get an alarm from the outer high-pt system, you should do the following:

(a) Check the gui. This should already be running; the display is on hb-cr02, which is the terminal next to the laser printer. If this display is hung or otherwise doesn't respond, kill the gui and start it again.

(b) If all HV channels on the gui display are green, all is OK. If one or more channels are red, look closely to see if a channel has tripped. If a channel has not tripped, wait for the alarm to go away. If it doesn't go away within a minute or so, call the expert [see (f) below]. If you cannot reach the expert and the alarm has still not gone away, go to (d) below.

(c) If a channel has tripped, change the state to "safe". This will quickly ramp all voltages down to 10% and turn back on the tripped channel. After all channels are on again, change the state to "ready". This will slowly ramp all voltages back up to 100%. PLEASE RECORD THE CHANNEL THAT TRIPPED AND THE RUN/EVENT NUMBER (approximately) AT WHICH THIS OCCURRED.

(d) If the tripped channel trips again, change the state to "safe", exclude the system from the slow control, and call or send email to the expert [see (f) below]. PLEASE RECORD THE RUN/EVENT NUMBER (approximately) AT WHICH THE OUTER HIGH-pT SYSTEM WAS EXCLUDED.

(e) DO NOT exclude the system from the slow control without changing the state to "safe".

(f) The outer high-pt on-call expert is Dickson Goulart. You can also try: Alan Schwartz (phone: 3155 or 001 513 556 0527 in US. Email: schwartz@mail.desy.de).

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How to know that the detector is on and ready

No instructions exist. If you need to know if the detector is on and ready, contact the on-call expert.

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How to know that the detector is properly synchronized

No instructions exist. If you need to know if the detector is synchronized, contact the on-call expert.

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How to know that the data from this detector is sensible

No instructions exist. If you are taking data from this detector, contact the on-call expert periodically and ask if the data makes sense.

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What to do if I don't understand the instructions on this page

If you feel it could adversely affect the quality of the data being taken, contact the on-call expert. In any case, send an e-mail to the responsible for this page.

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