sPHENIX discussion of electronics

[Edouard Kistenev <kistenev AT bnl.gov>]

Hope this will answer all questions. My initial idea was to use “smart” tiles (with multiple embedded fibers) up and down of a tile stack to really map the tiles. Unfortunately this way of tile mapping happen to have limited applicability. Neither amplitude measurements on two fiber ends not timing measurements are able to provide position resolution to better then ~10% of the tile size what is difficult to define as “sufficient” for mapping. Real mapping requires fibers embedded with fiber-to-fiber separation of the order of 2cm to get position resolution ~0.5cm what means at least 100 channels of DRS4-like readout.

JH suggested that fine mapping of individual tiles is an overkill while a “one number” qualifier for the tile luminosity measured under same condition for every tile would be just right - makes it possible to do single pixel calibration, to sort the tiles (if deemed useful) and to avoid paying for shipping rejects all across the globe. The idea to use peak sensing to do all - single pixel, self-triggering of the tile stack when crossed by muon, and muon peak position measurements was developed jointly and was immediately discussed with Steve who kindly agreed to help with implementation. 

Knowing that Debrecen was looking for testing SiPM’s (what I would never do knowing what we know of over-testing devices well calibrated by manufacturer) I also contacted Gabor and  Norbert (see below) who sent me to talk to ?????? from Debrecen (was also a part of the test beam crew at FNAL). We talked - he got excited but never came back to either me or Steve. Sorry for not remembering the person’s name - I tried to make him work with Steve but somehow it did not happened.

In the mean time Richie Rugiero slightly modified the black block embedded into tile both to locate the tile in the calorimeter and to catch it in the tile tester - great solution for both. With luck and help from MLenz and Steve we may have first setup by mid summer (for Uniplast to use to tune production QA) and something more generic from Debrecen (guys - Vladimir is equally beautiful) at a later time. 

Edward

Hi, Edward,

I was at the APS meeting, let's get back to this

tomorrow.  (In fact I'll have a phone conference with

Debrecen tomorrow morning anyway.)

Gabor

On Tue, 31 Jan 2017, Edward Kistenev wrote:

Gabor, Norbert, I tried to knock on Gabor's door for two days - in vain - should write this mail earlier. I wander if your Debrecen friends could be interested in helping to build scintillating tile qualifier for Uniplast (it is in the beautiful area of the Golden Ring north of Moscow). Mechanics and methodology of the whole project we are developing here at BNL, the main worry is that Steve may not have much time to do readout part of it in a way which is kind of new but not yet developed or tested. Experience shows that whenever we work in the 20 pixel firing range  of SiPM we do not really need full pulse digitization, if we can measure peak value it is normally sufficient to resolve details down to the single pixel calibration.

So we would like to do exactly that - build a peak sensing channel able to extract value of the per tile light yield when exposed to cosmic. It should be simple, compact and very reliable (we’ll need 8-channels grouping, few kits). If there can be an interest - let me know.

-- 

Gabor David  (david AT bnl.gov)

 

On Mar 15, 2017, at 8:26 AM, Boose, Stephen <boose AT bnl.gov> wrote:

Hi Gabor,
If I could jump in here, I understand what you're saying to be absolutely correct. Edward had requested simply to store peak values when a coincidence >3 existed between the tiles.
We can discuss in detail at the meeting.

Steve Boose
PHENIX Experiment
Brookhaven National Laboratory
BLDG 510C
Upton, NY 11973
Ph: (631) 344-2897
Fx: (631) 344-3253

-----Original Message-----
From: sphenix-electronics-l-bounces AT lists.bnl.gov [mailto:sphenix-
electronics-l-bounces AT lists.bnl.gov] On Behalf Of Gabor David
Sent: Tuesday, March 14, 2017 7:29 PM
To: Mannel, Eric
Cc: sphenix-electronics-l AT lists.bnl.gov
Subject: Re: [Sphenix-electronics-l] Bi-weekly Calorimeter Electronics
Meeting, 15-Mar-2017 @ 1330

On Mon, 13 Mar 2017, eric mannel wrote:

Dear Ron, Eric (and all),

my understanding is that we are talking about different devices
serving different purposes.  The Colorado device - as far as I know - is a
genuine "tile mapper", measuring the response as a function of where the
light was produced (and served for instance to optimize the path of the
lightguide).

The device Debrecen was asked to look into is what I would call a "tile
tester", a QA device to be used at the factory, that would take the tiles just
manufactured, run overnight with cosmics (and maybe with LEDs the same
way as in the calibration system) - then based on their average response
whether the tile is acceptable for delivery or not.

Gabor

Ron-

This is suppose to be electronics that can be used at Uniplast to Q/A
the tiles before shipping to the U.S. using cosmic rays.  There was
some discussion of it at different stages during the beam test, mostly
lead by Edward.  If you want to put up a few slides about the Colorado
stand that would be fine.

Eric


On 3/13/17 3:56 PM, Ron Belmont wrote:
     Hi Eric, All,
What kind of Tile Mapper is this?  Is it similar to what we have in
Colorado or something different?

Regards,

Ron



On Mon, Mar 13, 2017 at 9:55 AM, eric mannel <mannel AT bnl.gov> wrote:
     Folks-

     The Ides of March are here, so it is time for the next
     bi-weekly
     calorimeter electronics meeting this Wednesday,
     15-Mar-2017 @ 1330 EDT
     (1930 UTC- for those outside the US, we fell forward this
     past weekend
     to daylight savings time).

     For the meeting, I would like to get a quick update on
     digitizer status
     (Nevis/BN) and also have a discussion of the HCal
     TileMapper (BNL/Debrecen)

     Details of the meeting can be found on the indico webpage:
     https://indico.bnl.gov/conferenceDisplay.py?confId=2946

     We will adjourn promptly at 1530 EDT in anticipation of
     joining the
     always scintillating HCal meeting.

     Eric

     --
     Eric J. Mannel, Ph.D.
     PHENIX Group
     Physics Dept.
     Brookhaven National Laboratory
     631/344-7626 (Office)
     914/659-3235 (Cell)

     _______________________________________________
     sPHENIX-electronics-l mailing list
     sPHENIX-electronics-l AT lists.bnl.gov
     https://lists.bnl.gov/mailman/listinfo/sphenix-electronics-l




--
-----------------------------------------------------
Ron Belmont
Postdoctoral Research Associate
University of Colorado, Boulder
ron.belmont AT colorado.edu
-----------------------------------------------------

--
Gabor David  (david AT bnl.gov)
Stony Brook University
[Brookhaven National Laboratory
Physics Department, Bldg 510/c
UPTON NY 11973
Tel: (631)344-3016
FAX: (631)344-3253]

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