Left RICH
RICH on-line monitor for Shift Workers:
on the Hall A NewTools, "EDM (HLA Main)", click on "RICH Detector" then check that Radiator Pressure is around 10 V, the Power Supply around 3.8 V both polarities (A nearly 3.76 V, B nearly 3.93 V), then click on "CAEN" buttom, on the "Crate 1" window popping up, click on "Modules" and then again on the next window "Crate #1" with the four modules of Crate #1, click on "Modules" of "Module 2", the only active module, then you can check and modify HV. Channel 16 and Channel 17 are the only channels connected to the detector. They have to be on Status "Normal", "HVon" have to be "ON" and the voltage "Vmon" has to correspond to the voltage "Vset", nominally between 2200 and 2300 for Channel 16 and between 200 and 400 on Channel 17. If not, click on the "Module 2 Controls Screen" button, on the bottom of the panel, and click on "HVon" ON, then the HV should raise up very slowly, 5 V/s. If a trip occurred, the Status of the channel will be "Trip", after turning on the HV go back to the first "Crate 1" window and click on "Clear All Alarm". Then the status should change into "Up" and eventually into "Normal".
Tun HV off during beam studies or configuration changes of HRS. In case of trip, keep HV off also during configuration changes of BigBite.
If the RICH is continuing tripping, keep HV off and call a RICH expert, do not try to keep HV on more than twice consecutively.
