This is great - thanks guys!
I think this will be an interesting way to cross-check the HCAL
calibrations.
John
On 2/20/2017 8:46 PM, John Haggerty
wrote:
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
Upton, NY 11973-5000
Office: 631-344-5898
Cell: 757-604-9946
______________________________
*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>
Facebook <http://www.facebook.com/john.lajoie.5>LinkedIn
<http://www.linkedin.com/pub/john-lajoie/9/a9/bba/>
Contact me: Skypejohn.lajoie
_______________________________________________
sPHENIX-HCal-l mailing list
sPHENIX-HCal-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/sphenix-hcal-l
