sPHENIX cold QCD topical group

["Huang, Jin" <jhuang AT bnl.gov>]

Hi, Yuji and John

 

Thanks for developing the HCal test too.

 

I also agree with John that without an EMCal, the test would be very different from the fsPHENIX LOI calorimeter stack (the location of dead material in the calorimeter stack matters). Besides, I worry at the end, the performance with a plug door would be significantly worse than that without, as shown in Figure 3.3 of the fsPHENIX LOI. When shown around out of context, it could lead to adverse PR for us.

 

Alternatively, we may consider having an additional test with a much thinner inactive material in front, e.g., 1-cm or 1-inch thick steel plate. The reasoning behind is that we hope the HCal with steel absorbers could serve as the field return itself. However, with segmented plates, HCal does need additional structural support in front to counter the magnetic force and quenching force. Without a real calculation, I guess a 1-cm and a 1-inch steel plate could play this role. And I hope with such a thin inactive layer (5-10% X0), its impact on the performance of the calorimeter system would be minimal.

 

Cheers

 

Jin

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sPHENIX-cold-QCD-l <sphenix-cold-qcd-l-bounces AT lists.bnl.gov> On Behalf Of Lajoie, John G [PHYSA]
Sent: Thursday, February 7, 2019 10:47 AM
To: Goto, Yuji <goto AT bnl.gov>; sphenix-cold-qcd-l AT lists.bnl.gov
Subject: Re: [Sphenix-cold-qcd-l] STAR+EIC R&D forward HCal beam test in April [Re: Next Cold QCD TG meeting Mon, Feb 4, at 8:30 pm EST]

 

Hi Yuji,

 

No particular ideas, I was just wondering what the test configuration would look like. Without an EMCal in front you wouldn’t be able to examine the effect of the plug door on the class of events that start to shower in the EMCal, but it looks like you will have that.

 

Good luck!

 

John

 

From: Yuji Goto <goto AT bnl.gov>
Sent: Wednesday, February 6, 2019 7:57 PM
To: Lajoie, John G [PHYSA] <lajoie AT iastate.edu>; sphenix-cold-qcd-l AT lists.bnl.gov
Subject: Re: [Sphenix-cold-qcd-l] STAR+EIC R&D forward HCal beam test in April [Re: Next Cold QCD TG meeting Mon, Feb 4, at 8:30 pm EST]

 

Hi John,

I heard the main test will be performed for the STAR FCS configuration with EMCal (refurbished PHENIX PbSc, I think) + HCal. For our test for EMC-sPHENIX with steel, we plan to test only HCal without EMCal. Do you have an idea to test EMCal + steel + HCal?

Yuji

On 2019/02/07 6:17, Lajoie, John G [PHYSA] wrote:

Hi Yuji,

 

This is a very interesting development!

Do you plan to have some sort of an EMCal in front of the steel simulating the flux return, or just the steel and the hadronic calorimeter?

 

John

 

From: sPHENIX-cold-QCD-l <sphenix-cold-qcd-l-bounces AT lists.bnl.gov> On Behalf Of Yuji Goto
Sent: Tuesday, February 5, 2019 11:30 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: [Sphenix-cold-qcd-l] STAR+EIC R&D forward HCal beam test in April [Re: Next Cold QCD TG meeting Mon, Feb 4, at 8:30 pm EST]

 

Dear Cold QCD TG members,

Separately from the forward EMCal discussion, we (RIKEN group) are working with STAR forward upgrade + EIC R&D group for the forward HCal R&D. For the calorimeter test, there will be a Fermilab test beam from April 3rd to 23rd. On this occasion of the HCal beam test, we are going to take a data for the EIC-sPHENIX which mimic the return yoke of the Babar magnet and study its effect for the HCal performance. We will compare the performance with and without the 10cm iron in front of the HCal. It is very welcome if someone has interest in taking part in this study, the test beam and the data analysis. We're discussing with Oleg Tsai to have this study sometime in the 3rd week of the test beam around April 14-20.

Best regards,

Yuji

On 2019/01/26 23:29, Aidala, Christine wrote:

Dear Cold QCD enthusiasts,

 

We will have a meeting on Monday, February 4^th, 8:30 pm EST to discuss efforts by John Lajoie, Sasha Bazilevsky, and Joe Osborn towards a forward EMCal based on the E864 calorimeter sections.

 

The meeting is BlueJeans only (https://bluejeans.com/345777492) with two talks on the agenda so far https://indico.bnl.gov/event/5651/.

 

Overview of sPHENIX forward EMCal based on E864 calorimeter sections – John Lajoie

Simulation studies for forward EMCal based on E864 calorimeter – Sasha Bazilevsky

 

Let me know if you’d like to be added to the agenda.

 

Best regards,

Christine

 

--

Christine A. Aidala

Associate Professor

Department of Physics

University of Michigan

(734) 764-7611

 

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