Calculating Fluences from track records and comparing to MPX data

1. Calculating Fluencesfrom track records and comparing to MPX data KOI, Tatsumi SLAC National Accelerator Laboratory

2. Calculating Fluences from track records Track A • L = • V = Volume of Scoring Volume • Fluence [1/cm2] = L [cm]/ V[cm3] • No need for limitation in scoring volume shape • No need for assumption in directional distribution of track A Scoring Volume Segment A Segment A’ Track B Segment B

3. Calculating Fluences from track records Track A • Each of our track record has • Entering point • Direction at the point • ID of scoring volume • Calculating escaping point from the scoring volume • Calculating distance between these two points • Assuming no interaction happen between them A Scoring Volume Segment A Segment A’ Track B Segment B

4. Calculations • FLUGG Tag 00-01-31 • Last tag before winter breaks • Input event • Minimum bias PHOJET 7TeV • 9984 events calculated • 1MeV cut for electrons • Disable Radioactive Decay

5. Location of MPX detectors MPX1 and MPX14 MPX2 and MPX13 are located in symmetrical positions

6. Thermal neutron (<0.3eV) fluencesMPX data and G3 calculationfrom Jaroslav 11/21/2011 MPX1 MPX14 MPX2 MPX13 100mb is used for the cross section of ppcollision at 7TeV to keep a consistency to the Jaroslav results MPX1 and MPX14 MPX2 and MPX13 are located in symmetrical positions

7. Thermal Neutron (<0.3eV) Fluences Scoring Volume for each MPX has 1cm thickness in R and Z

9. Anisotropyz-distribution of directional vectors MPX 1 and 14 MPX 2 and 13

10. Anisotropy MPX3,4,5,6z-distribution of directional vectors Need more events

11. Anisotropy MPX15z-distribution of directional vectors

12. Neutron Energy SpectrumMPX1 and 14 eV MeV

13. Neutron Energy SpectrumMPX2 and 13 eV MeV

14. Neutron Energy SpectrumMPX15

16. MPX datafrom Jaroslav 11/21/2011 MPX1 MPX14 MPX2 MPX13 MPX1 and MPX14 MPX2 and MPX13 are located in symmetrical positions

17. FLUGG Calculation Statistical limitation on 10k events

18. Comparisonbetween data and FLUGG(MC) Electrons, protons and muons Electrons have 1MeV energy cuts in simulation

19. Summary • There 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 positions • This 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 MPX • MPX15 has a much different spectrum from others • Does data analysis properly include this? • We also calculate fluences for electrons (e-+), proton(p/anti-p) and muosn(mu+-) and compare to the data.

20. Number of thermal neutron (<0.3eV) tracks in each MPX Scoring Volume

21. Number of electrons (e-/e+) tracks in each MPX Scoring Volume1MeV Cut

22. Number of protons (p / anti-p) tracks in each MPX Scoring Volume

23. Number of muons (+/-)tracks in each MPX Scoring Volume