Gabriele Cosmo
81 lines
2.2 KiB
Python
81 lines
2.2 KiB
Python
# $Id: detector.py,v 1.3 2003/06/26 11:54:13 dressel Exp $
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# -------------------------------------------------------------------
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# GEANT4 tag $Name: geant4-06-00-patch-01 $
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# -------------------------------------------------------------------
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#
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# A detector is either the of the "simple" or "ring" type.
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# the volumina of the "simple" detectors are the same at all
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# positions (00, 20, 40 cm off beam axis). The "ring" type detectors
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# have different volumina at the different positions.
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# For convinience a class Detector is provided to link a detector
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# position and it's volume.
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d00Volume = 1608.8 # volume of the 12.9 cm x 12.9 cm cyinder
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d20Volume = 20268.3 # volume of the ring at 20 cm
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d40Volume = 40536.6 # volume of the ring at 40 cm
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# map of distances to volumina for the 12.9 cm x 12.9 cm detectors
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SimpleDetectorVolume = {"00":d00Volume, "20":d00Volume, "40":d00Volume}
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# map of distances to volumina for ring detectors
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RingDetectorVolume = {"00":d00Volume, "20":d20Volume, "40":d40Volume}
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# map of detector type to distance-volumina map
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DetectorVolume = {"simple":SimpleDetectorVolume,
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"ring" :RingDetectorVolume}
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# the area of the beam pipe needed for scaling
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beamPipeArea = 93.31
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# the source detector volume: beamPipeArea * 0.1 cm
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sourceDetectorVolume = 9.33
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# source flux from the TIARA paper
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Fexp43_Coli = 1.76E+04
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Fexp43 = 1.94E+04
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Fexp68_Coli = 2.04E+04
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Fexp68 = 2.46E+04
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class Detector(object):
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"Distance and volume of a Detector."
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def __init__(self, dist, detType):
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self.name = dist
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self.volume = DetectorVolume[detType][dist]
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# function to calculate the scale factor
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def detScale(ngen, energy, coli):
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"""Detrmine scale.
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Determine scale according to the number of generated neutrons,
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the proton beam energy. If coli == 1, the flux at the
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colimator exit is used, else the flux at 401 cm is used.
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"""
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Asrc = beamPipeArea
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Fexp = 0
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if energy == "43":
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if coli == 1:
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Fexp = Fexp43_Coli
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else:
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Fexp = Fexp43
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else:
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if energy == "68":
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if coli == 1:
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Fexp = Fexp68_Coli
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else:
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Fexp = Fexp68
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S = Fexp * Asrc / ngen
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return S
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