sPHENIX HCal discussion

[Anthony Michael Hodges <ahodges21 AT student.gsu.edu>]

Hi John, 

Sure, let me attach some slides as to what's gone on here at GSU. Additionally, it should be noted that the pilot tiles have the old light blocker, and all the new tiles have the newer one; I'm not sure if that was clear at the meeting last week. The first several slides detail how I've chosen the testing configuration; slides 10 and 11 address the use of the pilot tiles. Essentially, we're looking at a sample deviation of about 50% in the slides that I show, which translates to a >100% deviation from the pilot tile at points. So that's obviously worrisome, but before we panic, of course, we should see where properly seating the SiPM's gets us. These tests were from one stack (as Edward pointed out, the first stack usually stays in the tester the longest to make sure there are no strange systematics at work), so now the plan is to see if this variance occurs over the rest of the tiles we have. 

Hope this helps, 

-Anthony 

Anthony Hodges

PhD. Student, Georgia State University

Nuclear and High Energy Physics

ahodges21 AT student.gsu.edu

---

From: Lajoie, John G [PHYSA] <lajoie AT iastate.edu>
Sent: Wednesday, January 30, 2019 9:54:50 AM
To: Anthony Michael Hodges; sphenix-hcal-l AT lists.bnl.gov
Subject: RE: Interim HCal Meeting 1/30

 

Hi Anthony,

 

Thanks for the update. I do have a few questions, however.

 

At last week’s HCAL meeting we talked about testing tiles relative to reference tiles (the pilot tiles), which is the information that we really want. We decided that was possible even with the existing test stand.  In particular, we decided that results like this would be very useful to have before we switch over to the new test stand.  You email makes it sound like you’re not getting results you feel comfortable with; could you give some more detail as to why? What part of our assumptions from last week’s HCAL meeting was incorrect?

 

If you really need the new test stand, what is the schedule for shipping the new test stand to GSU? It sounds like Mike had this nearly ready to go last week.

 

Regards,

John

 

   
John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

 

From: Anthony Michael Hodges
Sent: Wednesday, January 30, 2019 8:33 AM
To: Lajoie, John G [PHYSA]; sphenix-hcal-l AT lists.bnl.gov
Subject: Interim HCal Meeting 1/30

 

Hi everyone, 

 

Last week we discussed having an interim HCal meeting today to discuss the progress of the tile testing at GSU. Testing has been going on, but without the new test stand, particularly the new SiPM holders, it's hard to draw any useful, definitive conclusions on the tiles' performance. So, I propose we just keep with our regularly scheduled HCal meeting next week, by which point, presumably, we'll have the new test stand and something more concrete to show. 

 

Cheers, 

-Anthony

 

Anthony Hodges

PhD. Student, Georgia State University

Nuclear and High Energy Physics

ahodges21 AT student.gsu.edu

 

From: sPHENIX-HCal-l <sphenix-hcal-l-bounces AT lists.bnl.gov> on behalf of Lajoie, John G [PHYSA] <lajoie AT iastate.edu>
Sent: Tuesday, January 22, 2019 11:04 AM
To: sphenix-hcal-l AT lists.bnl.gov
Subject: [Sphenix-hcal-l] HCAL meeting 1/23

 

Dear HCAL'ers:

    We will have an HCAL meeting this Wednesday, Jan. 23rd at 3PM BNL time (NOTE NEW TIME):

https://indico.bnl.gov/event/5637/

I am hoping to hear something from GSU on tests of the new tiles as well on the development of the new tile tester. Other reports and updates are certainly welcome!

Regards,
John

--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

 

Attachment: Hodges_GSU_InterimTesterUpdate.pdf
Description: Hodges_GSU_InterimTesterUpdate.pdf