sPHENIX HCal discussion

[John Haggerty <haggerty AT bnl.gov>]

Jin, Edward, and I set this up today, and runs 4011-4015 are a few 
attempts at making sensible triggers with muons.  There are more details 
in the elog.  Since the beam is so big, the PbGl, which is in the 
general neighborhood of the beam, also saw muons.

On 2/7/17 8:52 AM, Huang, Jin wrote:
> 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
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> Office: 631-344-5898
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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 <mailto:lajoie AT iastate.edu>
>
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--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358