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Re: [Sphenix-hcal-l] First results from the big tile

From: John Lajoie <lajoie AT iastate.edu>
To: Ron Belmont <ron.belmont AT colorado.edu>
Cc: sphenix-hcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-hcal-l] First results from the big tile
Date: Wed, 28 Oct 2015 12:24:45 -0500

Hi Ron,

Thanks - I think that for the response map the gross features are what we are trying to get right. I the tile coating is not uniform from place to place on the scale of the 5cm steps in the LED scan we could always apply some limited smoothing, I suppose?

John

On 10/28/2015 12:12 PM, Ron Belmont wrote:

Hi John,

Two quick answers:

(1) We haven't looked into it in detail, so I don't know for sure. Hopefully we can discuss this a bit more at the next HCal meeting.

(2) That sounds like a good idea, and in principle yes I think it should be possible. A few more cosmics scans in different places on the tile would help, and those are ongoing. However, an important caveat to this is that the tile coating is not uniform, so the LED scan is not perfectly representative of the light response across the entire tile. How important that is depends on the level of accuracy needed for the simulations.

Cheers,

Ron

On Wed, Oct 28, 2015 at 10:04 AM, John Lajoie <lajoie AT iastate.edu> wrote:

Hi Ron,

Very nice! Two questions, both aimed at extracting numbers that we can implement in the HCAL simulations:

(1) Do you know the width of the pedestals (in pe's) in your setup? For the HCAL simulations right now we've assumed a width of 8pe's and making a 2-sigma cut on tower energies. This was just a guess, so it might be nice to tie what we are using to a number from a test bench.

(2) On slide 5 (LED scan) you show a beautiful scan of the full tile. I was looking at this and wondering if this could be used to get a map of the MIP response. Would it make sense to use the LED map as a relative response and just normalize it to the cosmics MIP response at a few locations (like what you have on the previous two slides)? Do you think this would yield a reasonable light yield map that could be used in the Monte Carlo?

If so it might be useful to get that from your data and try to implement it in the MC. Of course this is just one tile shape, but maybe we think about a logical way to scale between different sizes. This may be too much of an extrapolation, but it the absence of anything better it might be a start.

Regards,
John

On 10/27/2015 5:17 PM, Ron Belmont wrote:

Hi All,

I've uploaded a brief set of slides showing the first results from the big tile tests to my phenix/p/draft area: https://www.phenix.bnl.gov/WWW/p/draft/belmonrj/HCal/bigtile.pdf

Comments and suggestions are welcome! If you're not on PHENIX but would like to have a look, please let me know and I'll send them to you directly.

Cheers,

Ron

--

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

PHENIX Deputy Spokesperson

Professor of Physics

Iowa State University

(515) 294-6952

lajoie AT iastate.edu

Contact me: john.lajoie

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