track records and comparing to MPX data KOI Tatsumi SLAC National Accelerator Laboratory 1 Calculating Fluences from track records L V Volume of Scoring Volume Fluence 1cm ID: 792154
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Slide1
Calculating Fluences from track records and comparing to MPX data
KOI, TatsumiSLAC National Accelerator Laboratory
1
Slide2Calculating Fluences from track records
L =
V = Volume of
Scoring Volume
Fluence [1/cm2]= L [cm]/ V[cm3]No need for limitation in scoring volume shapeNo need for assumption in directional distribution of track
Track A
Track B
A Scoring Volume
Segment A
Segment A’
Segment B
2
Slide3Calculating Fluences from track records
Each of our track record hasEntering point Direction at the point
ID of scoring
v
olumeCalculating escaping point from the scoring volumeCalculating distance between these two pointsAssuming no interaction happen between them
Track A
Track B
A Scoring Volume
Segment A
Segment A’
Segment B
3
Slide4Calculations FLUGG Tag 00-01-31Last tag before winter breaks
Input eventMinimum bias PHOJET 7TeV9984 events calculated1MeV cut for electrons
Disable Radioactive Decay
4
Slide5Location of MPX detectors5
MPX1 and MPX14
MPX2 and MPX13 are located in symmetrical positions
Slide6Thermal neutron (<0.3eV) fluences
MPX data and G3 calculation from Jaroslav 11/21/2011
6
MPX1
MPX2
MPX14
MPX13
MPX1 and MPX14
MPX2 and MPX13 are located in symmetrical positions
100mb is used for
t
he cross section of
pp
collision at 7TeV to keep a consistency to the Jaroslav results
Slide7Thermal Neutron (<0.3eV) Fluences
Scoring Volume for each MPX has 1cm thickness in R and Z
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Slide88
Slide9Anisotropyz-distribution of directional vectors
MPX 1 and 14
MPX 2 and 13
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Slide10Anisotropy MPX3,4,5,6z-distribution of directional vectors
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Need more events
Slide11Anisotropy MPX15z-distribution of directional vectors
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Slide12Neutron Energy SpectrumMPX1 and 14
MeV
eV
Slide13Neutron Energy SpectrumMPX2 and 13
eV
MeV
Slide14Neutron Energy SpectrumMPX15
Slide1515
Slide16MPX datafrom Jaroslav 11/21/2011
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MPX1
MPX2
MPX14
MPX13
MPX1 and MPX14
MPX2 and MPX13 are located in symmetrical positions
Slide17FLUGG Calculation17
Statistical limitation on 10k events
Slide18Comparison between data and FLUGG(MC) Electrons, protons and muons
Electrons have 1MeV energy cuts in simulation
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Slide19SummaryThere are relatively large differences in
fluences estimation at MPX1 and 14 between this work and previous work (Jaroslav) This may come from anisotropy of thermal neutrons at the positionsThis may come from anisotropy of thermal neutrons at the positions (
Agreements to the data are improved but most likely by chance. Because the data analysis assumed isotropic neutron
fluences
.Our result and Mike’s calculation agree within a few factors for all MPXs.Relatively large difference between calculations and data for MPX7-11, where has low rate in thermal neutron flux.Energy Spectrum of neutrons are different among the position of MPXMPX15 has a much different spectrum from othersDoes data analysis properly include this?We also calculate fluences for electrons (e-+), proton(p/anti-p) and muosn
(mu+-) and compare to the data.
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Slide20Number of thermal neutron (<0.3eV) tracks in each MPX Scoring Volume
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Slide21Number of electrons (e-/e+) tracks in each MPX Scoring Volume 1MeV Cut
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Slide22Number of protons (p / anti-p) tracks in each MPX Scoring Volume
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Slide23Number of muons (+/-) tracks in each MPX Scoring Volume
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