sPHENIX HCal discussion

[Stefan Bathe <stefan.bathe AT baruch.cuny.edu>]

Hi John,

A few comments:

1. Sectors will move in groups of ~four from 912 to 1008, and be tested prior to installation in 1008 using LEDs. Modules will need to be set in 1008 so the electronics boxes are accessible.
2. Need to test the short rack to see if we can first the LEDs for groups of individual tiles. The short rack uses a modified firmware but Steve Boose thinks it should still work if tested properly – Stefan, Dan

I think we need Steve’s help here.  So it should be Stefan, Dan, Steve  

I’m not sure it’s really necessary to test all individual SiPMs at this point.  I think if we get an LED signal from each read out channel, we should be satisfied.  We decided to move the short rack to 1008 and keep the DAQ rack in 912 b/c we wanted to keep the tests in 1008 quick and simple.—Less might be more here.--It’s much easier to test each SiPM with the DAQ rack in 912, because things are automated (scripted) and data is archived.  That’s why we do those tests in 912 and not in 1008.

3. Need to get a new short rack prepared so we have one in 912 for iHCAL assembly testing.  Stefan notes that for the iHCAL it is very possible that testing may become the bottleneck. Eric notes that setting up a new rack will have to get worked into the already overloaded technician schedule. – Eric, Sa
4. We agreed that it would be best to keep the post-installation testing procedure such that it is as simple as possible and requires as little additional training as possible.  To do this we will have the technicians plug in the cable to the electronics box and have the testers work with the short rack (on the platform).  This assumes we will succeed with testing more often than we will fail, but we will need some people with the additional training to work directly on the sector at height (accessing the electronics box or removing covers).  Need to define the required training for both situations. This will be different for the first 13 sectors and the remaining sectors – Chris Pontieri

I still think the physicists should be sufficiently trained to be allowed to plug in sectors.  Let’s keep our options open.

5. Workforce is a huge issue. Right now we are not only limited in the number of people we can have onsite (2 per location) but the ROOP only allows them to work in one location. This means we can’t have people in 912 go to 1008 to test for a few hours, and then return to work in 912.  This is highly inefficient of the limited workforce we have available. Once iHCAL assembly starts we will need additional workforce in 912 and the current distancing requirements (even for vaccinated people) interferes with this as well. Housing (apartments) are currently limited to one occupant. Ed has been made aware of these concerns, but there are meetings this week where he can push to have modifications made consistent with safety.  Glenn suggested a summary of concerns be sent to Ed to give him ammunition – Stefan (done)

 

I sent this message to Ed yesterday.

Regards,

Stefan

John

 

John Lajoie

he, him, his

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

 

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