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Re: [Sphenix-hcal-l] HCAL meeting 8/15

From: John Lajoie <lajoie AT iastate.edu>
To: sphenix-hcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-hcal-l] HCAL meeting 8/15
Date: Fri, 17 Aug 2018 16:08:42 -0500

Hi Sean,

Hmmm, what I guess I don't understand is the setup you used and how reliable the response is as a function of wavelength? Is it possible there is some systematic shift in the wavelength (calibration?) or some differential absorption that shifts the peak? In other words, would you really expect to measure exactly 476nm?

I don't suppose we have similar measurements for previous batches of fiber?

As John H. points out this is just fine for the SiPM's, so it's a question of how much extra effort it is really worth trying to sort out the difference.

John

On 8/17/2018 3:48 PM, Sean Stoll wrote:

John,

I also didn't see any red flags, but as John H points out, the specified emission for the fiber is not 100% clear. Kuraray lists the peak emission as 476nm, and that agrees with the lower left plot on slide 1 (from their product info). The emission that I measure looks more like the other spectrum shown in their literature (top right of slide 1), which peaks at ~ 500nm.

Sean

On 8/17/2018 3:44 PM, John Lajoie wrote:

Hi Sean,

Thanks for doing this!

It certainly looks like WLS fiber to me. I didn't see any red flags in looking through your presentation - did I miss anything?

John

On 8/17/2018 2:22 PM, Sean Stoll wrote:

Here is some data & documentation from the Y-11 WLS fiber shipment that we received recently.

Sean

On 8/13/2018 12:00 PM, John Lajoie wrote:

Dear HCAL'ers:

We will have our regular HCAL bi-weekly meeting this Wednesday, 8/15 at 2:30PM BNL time. The agenda is evolving at:

https://indico.bnl.gov/event/4939/

I'm hoping we can hear updates on the tile radiation testing, status of the tile tester and the analysis of the test beam data. Other contributions are certainly welcome!

John

John Lajoie

Professor of Physics

Iowa State University

(515) 294-6952

lajoie AT iastate.edu

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-- 
Sean Stoll
Physics Associate
Brookhaven Nat. Lab
Upton, NY 11973
631.344.5331

_______________________________________________
sPHENIX-HCal-l mailing list
sPHENIX-HCal-l AT lists.bnl.gov
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John Lajoie

Professor of Physics

Iowa State University

(515) 294-6952

lajoie AT iastate.edu

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

-- 
Sean Stoll
Physics Associate
Brookhaven Nat. Lab
Upton, NY 11973
631.344.5331

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

John Lajoie

Professor of Physics

Iowa State University

(515) 294-6952

lajoie AT iastate.edu

[Sphenix-hcal-l] HCAL meeting 8/15, John Lajoie, 08/13/2018
- Re: [Sphenix-hcal-l] HCAL meeting 8/15, Sean Stoll, 08/17/2018
  - Re: [Sphenix-hcal-l] HCAL meeting 8/15, John Lajoie, 08/17/2018
    - Re: [Sphenix-hcal-l] HCAL meeting 8/15, John Haggerty, 08/17/2018
    - Re: [Sphenix-hcal-l] HCAL meeting 8/15, Sean Stoll, 08/17/2018
      - Re: [Sphenix-hcal-l] HCAL meeting 8/15, John Lajoie, 08/17/2018
        
        Re: [Sphenix-hcal-l] HCAL meeting 8/15, Sean Stoll, 08/17/2018
        
        Re: [Sphenix-hcal-l] HCAL meeting 8/15, Edward Kistenev, 08/18/2018