sPHENIX HCal discussion

[John Lajoie <lajoie AT iastate.edu>]

Hi Edward,

    Since it is the collaboration meeting this week we don't have an HCAL meeting.  However, it has been on my list some time to have a small group write down the calibration procedure from beginning to end and present it at an HCAL meeting.  You likely have all this in your head, but it would be nice to get it written down so we can start thinking through the implications.  If we really are going into production in a year we need figure out of there are any holes or flaws in the calibration procedure.

    How about this - Abhisek has actually calibrated the HCAL in the test beam, so maybe I could ask you an him to work out a detailed plan, put it in a PPT file, and make a presentation at next week's HCAL meeting?

John

On 6/12/2017 12:23 PM, Edward Kistenev wrote:

Hi, John,
I talked to Richie in the corridor, he claims that design of the  table which allows rotating HInner for 360 deg’s is made by Chris and is ready to go to the shop this week. If I missed it - still great but if it was never discussed in the group - why don’t we do it this week in the HCal meeting.
			Edward


On Jun 12, 2017, at 11:09 AM, Edouard Kistenev <kistenev AT bnl.gov> wrote:

John, this is great but the novelty of this setup is limited to new electronics not to calorimeter itself.
For two years I am wandering around begging to design and build a very simple support stand which will allow for rotating the prototype around horizontal axis (estimates converge around 2 months time to design/order and assemble) - at some time it almost started but … no enthusiasm from project management was always able to kill the idea. Maybe the move to HCal lab will help to revive it - it is something really important. At this moment we have little or no idea of how the calibration will change when towers are repositioned to their final destination and will calorimeter modules in some peculiar orientation (vertical axis) be able to produce enough of measurable signals for triggering or trigger must be correlated between Outer/Inner and emcal.
			Edward

On Jun 12, 2017, at 9:14 AM, John Haggerty <haggerty AT bnl.gov> wrote:

Anthony and I set up the Inner HCAL (which is now in the HCAL lab) to take cosmics on Friday and we took a few runs over the weekend.

Some other notes and remarks:

- Taking cosmic data pointed out to me that I didn't stretch the trigger input to the GTM when I set it up, and since the trigger input is re-clocked to the 10 MHz clock in the GTM, it misses trigger inputs in where there is no overlap between the input and the clock; the effect of that is that the triggers are still random, but you don't get as many as you could.  I stretched the signal so it's 120 ns long.

- We were running out of room in
/sphenix/data/data01/caladc
at RCF where we stash the data, so Chris gave us space in
/sphenix/data/data03/phnxreco/
and I moved all the stuff that used to be on data01 to there.  Probably I could just delete it, but I thought we'd keep it around for a while.

- There are two files of cosmics (about 3500 events) in

/sphenix/data/data01/caladc/hcallab

with 14 bit goodness; we tried to keep the channel ordering the same as before (64-95), but the high and low gain channels are switched around (for the afficionados, we needed to reverse the polarity of the signal relative to what we had in the HBD electronics, so we flipped the slice on the preamps, which switches even and odd).  The good stuff is here:

cosmic_2017_06_09_17_14.prdf
cosmic_2017_06_11_16_32.prdf

triggered by paddles under "column 0" of the Inner HCAL.

-- 
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

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