In order to run FTPCs for the Oxygen run, the following protocol is suggesed.
1. Turn on all electrodes with active 0V on, so that electrodes are not floating.
2. Switch on Gating Grid and make sure it is working.
3. Ramp up in a few steps the full nominal drift field (-17.3 kV).
4. Put +500V to the SenseWires and see if it does not draw current on the long term, i.e. no broken wire.
5. Put the SenseWires to +800V and see the raw data signals / semi-online QA.
6. Climb up in max 50V steps, later in 20V steps, later in 10V steps, until you reach the desired amplitudes in data.
7. Do not exceed the usual nominal SenseWire setting (+1150V). Do not go further if the in-spill anode current exceeds 300nA. Do not go further if the out-spill anode current exceeds 10nA.
Andras contacts: +36209231800, +41754111965 (161965), Andras.Laszlo@cern.ch. |