It is important that no-one is in the A2 hall when the beam is on - see the hall closing procedure which should achieve this. While we rarely use more than 100nA in our experiments, MAMI can produce 100uA, and such high currents are sometimes used during beam setup and optimisation. The tagger (and possibly PiP and TOF) can be killed by too much beam! Therefore the tagger 'OR16' rate should never exceed 1000000 (amongst other things - see below.).

Before first beam ensure:
1) 'OR16' scaler is connected to the correct tagger channels (see below).
2) Tagger vacuum is good (ask an expert!)
3) All 3 vacuum valves on the tagger beamline are open (ask an expert!)
4) Beamline telescope is out and photon tv mirror box is in.
5) Nothing, except the intended target and the beam stop blocks the photon beamline.
4) Tagger HV is off (remote control - see below)
5) The radiator is out (ie. blank is in). CHECK THE TV PICTURE!.
6) The photon beamstop is in.
7) The A2 hall is closed, and interlocks are complete (see below).
8) The Lead-Glass detector is out of the photon beam.

Before Beam optimisation ensure:
1) Tagger HV is off (remote control - see below)
2) The radiator is out (ie. blank is in). CHECK THE PICTURE!.
3) The photon beam stop is in.
4) The Lead-Glass detector is out of the photon beam.

After beamtime, or during any substantial break in beamtime ensure:
1) Tagger HV is off (remote control - see below)
2) The radiator is out (ie. blank is in). CHECK THE PICTURE!.
3) The photon beam stop is in.
4) The Lead-Glass detector is out of the photon beam.

Dan Watts

Last modified: Fri Jan 18 15:48:27 GMT 2002