MPS Minutes 20210527: Difference between revisions

Revision as of 23:05, 27 May 2021

Present: MA, RC, AD, HH, KL, RN, AL (recorder)

HH had issues with VME bridge module
Timings have to be very precise, otherwise one runs into issues with module. But CAEN documentation is really poor.
HH fixed issue with pulses - > Test with Ricky's crate on Monday.
For trip we no longer rely on timing system, but module will handle it itself and trip on the falling edge.
HH generating an additional 5us to existing 5us => 10us
There's requirement for pulses to be no wider than 1us, but we should be good as timing system generates 900ns pulse. HH to confirm with MR.
HH added two more status bits.

HH had a look at the spares storage rack and did not find a single slot HV PS, but only a couple 2 slot units.
There is a metal cover over the entire board. It looks like iseg did not want a users to open it up just to change the module address.
There seems to be no manual way to set the address.
AD to set address via IOC shell tomorrow (Friday). Work permit required.
Exchange first and second module to see if trip issue moves for next Post Mortem tests.

AL, MA connected all detectors in e-hall on Tuesday and tested all PMTs with LEDs except EHAT:PMT4, which had an SHV connector on LED cable in the hall instead of BNC. But label was correct. HH to replace connector after meeting.
Also tested all LICs by ramping up voltage and checking response.
AL changed all high energy labels on the roof and reconnected things.
MA reconnected all Ar lines. Now have sufficient flow rate. But turned off Ar for now until we expect beam.
Helmholz coil was installed this morning. AL, MA to install low energy detectors today. And install spare detector for diagnostics as requested by Brandon.
After low energy detectors are installed, work in e-hall should be finished for the moment.

HH replaced broken HV connector on roof for ELBT:PMT1C.
AD to correct LED label in epics on driver from EHBT:PMT4 to EHAT:PMT4.
MA: Wiki now accessible without vpn connection. Should be ok, as documents are only linked and not uploaded. To access those one still has to use vpn.
AL still needs to write up doc for LED calibration. For LICs, we'll probably just use regular spills (in between targets for instance) to test LIC response in the future.
MA, AL to do Post-Mortem tests.
AD approved Martin's document in docushare.

@@ Line 6: / Line 6: @@
 *HH fixed issue with pulses - > Test with Ricky's crate on Monday.
 *For trip we no longer rely on timing system, but module will handle it itself and trip on the falling edge.
-*
+*HH generating an additional 5us to existing 5us => 10us
+*There's requirement for pulses to be no wider than 1us, but we should be good as timing system generates 900ns pulse. HH to confirm with MR.
+*HH added two more status bits.
 ==HV BLM issue (iseg) ==