To maintain the chicane configuration, the magnetic field strength must scale with the beam energy: 1.5 Tesla at 6.6 GeV and 0.5 Tesla at 2.2 GeV. Is the field set correctly at 2.2 GeV?
  Takashi

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of Kyle McCarty
Sent: Thursday, November 14, 2013 8:32 AM
To: hps-software
Subject: 2.2 GeV Detector Magnetic Field

Hello hps-software,


I was performing an analysis on 2.2 GeV data as an extension of the analysis I performed for the 6.6 GeV data earlier, and noticed a bit of an anomaly. It appears that the beam is angled too strongly toward the electron side of the detector. If we consider, say, the background hits above 50 MeV, we can see that the center of the beam seems to be nearly to the electron edge of the beam hole.


These were generated using

hps-detectors/detectors/HPS-Proposal2014-v4-2pt2/HPS-Proposal2014-v4-2pt2.lcdd
hps-detectors/detectors/HPS-Proposal2014-v5-2pt2/HPS-Proposal2014-v5-2pt2.lcdd


for the V4 and V5 geometries respectively. I used SLIC version 3.1.1 and GEANT4 version 9.6.1.

Is this an issue with the magnetic field alignment in the geometry? Perhaps the alignment of the beam in the data files? If it is the latter, how would I check that?


I have attached the plots I generated for the background for reference. The naming convention is "CalorimeterHits_XXXX" where XXXX is the energy cut applied in MeV. Also, as a comparison, I have attached a 6.6 GeV background plot as well.


Thanks,

Kyle

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