sPHENIX HCal discussion

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

Hi, John

 

Interesting thoughts. Although I have not taken data in this mode, but on their webpage there is a muon mode:

• Muon Mode: Any of above modes with MT6 beam absorbers closed. The best rates are given in the Low E Pion Mode at 32 GeV -at 300,000 particles per spill, you should get several thousand muons per spill, over an area of 1 square meter.

The width of the muon beam seems nicely cover the HCal surface. We may choose to trigger on a large tile of scintillator or self-trigger. Suggest 32 GeV beam which penetrate well the Pb absorber that filter out the pions and they keep a straight-line in the HCals (compared to low energy muons). The amplitude of MIP signal depends on the hit position and angle on the HCal towers, therefore we need to make sure the edge towers are well covered in this beam + trigger.

 

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

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From: sphenix-hcal-l-bounces AT lists.bnl.gov [mailto:sphenix-hcal-l-bounces AT lists.bnl.gov] On Behalf Of John Lajoie
Sent: Tuesday, February 7, 2017 9:21 AM
To: sphenix-hcal-l AT lists.bnl.gov
Subject: [Sphenix-hcal-l] a possible special test beam run for HCAL?

 

Dear HCAL'ers:

    Abhisek and I were discussing an idea during the poster session at QM that I thought I might throw out to the general audience for discussion.  It might even be a special run for the test beam....

    As you know, the HCAL calibration is done with vertical muons.  This has seemed to work very well, but of course we are interested in ultimately calibrating for showers that develop longitudinally, not vertically.  It might be nice to double check our calibration procedure using a selection of test beam muons.

    So what we would want is a beam optimized for muons - I don't have the test beam parameters with me but I think you can get a fair fraction of the beam as muons at lower (but not too low) energy?  The Cerenkov counters would also need to be adjusted appropriately.

    I think the key question here would be if we could take data with the HCAL self-trigger?  Since the primary vertical cosmics sample that Abhisek uses for the HCAL calibration is self-triggered, I think we would want to take a sample triggered in the same way?

    Thoughts?

John

 

--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

Contact me: john.lajoie