sPHENIX HCal discussion

[Martin Purschke <purschke AT bnl.gov>]

Dear all,

at long last we had all the ingredients together to read out a sector of 
the HCal (sector 25 that happened to be connected) with a real sPHENIX 
digitizer. All other tests in 912 or 1008 had been done using the old 
PHENIX MBD electronics (and some were done with a DRS4). In order to 
avoid any surprises, we had long planned to read the HCal out with the 
"real thing". Today was the day.

Dan, Stefan, Hanpu, and I took some pulser and LED data. This was 
interleaved with other rigging work in the AH, but we got some useful runs.

I have first renamed the files to some more meaningful names (the DAQ 
setup will become more polished tomorrow and over the weekend to do that 
out of the box) and have uploaded them to the RCF at

/sphenix/data/data02/sphenix/hcal/1008

There are directories for LED, Pulser, cosmics (no cosmics files there yet).

There are 48 connected channels out of the 64 that the digitizer has, 
0-23 the south half, and 24-47 the north half of the sector.

For a quick look, I attach single event displays of the 48 channels vs 
the 31 waveform samples for north + south (the LED/pulser works on a 
half sector at a time). Those are LED runs.

One of the questions we had that was already answered today: the 
polarity of the signals is right.


We later switched to sector 2 at the about 6 o'clock position, where we 
installed (or tried to) a cosmic ray telescope with 2 scintillator 
paddles, one in the magnet and one underneath the barrel (Dan and Stefan 
took some pictures). Unfortunately, while both worked just fine in a 
test when I set up the coincidence logic the day before, I could not get 
the lower one to hold HV today (maybe b/c we had drizzling rain and high 
humidity today?). Since I had to leave early today, for now I used just 
the upper one, which of course is a really poor trigger. But I do see a 
cosmic signal here and there. More tomorrow.

The list of runs and some more info in the ELog at

https://sphenix-intra.sdcc.bnl.gov/WWW/elog/HCAL/1432

Best,
        Martin


--
Martin L. Purschke, Ph.D.        ;   purschke AT bnl.gov
                                 ;   http://www.phenix.bnl.gov/~purschke
                                 ;
Brookhaven National Laboratory   ;   phone: +1-631-344-5244
Physics Department Bldg 510 C    ;   fax:   +1-631-344-3253
Upton, NY 11973-5000             ;   skype: mpurschke
-----------------------------------------------------------------------

Attachment: run48_LED_north.gif
Description: GIF image

Attachment: run47_LED_south.gif
Description: GIF image