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Hadronic calorimeter simulation

Hadronic calorimeter simulation. S.Itoh, T.Takeshita ( Shinshu Univ.) GLC calorimeter group. Contents Comparison between Scintillator and Gas - Digital and Analog Hadronic calorimeter. Introduction. Lead : 8mm Scintillator : 2mm.

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Hadronic calorimeter simulation

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  1. Hadronic calorimeter simulation S.Itoh, T.Takeshita ( Shinshu Univ.) GLC calorimeter group • Contents • Comparison between Scintillator and Gas • - Digital and Analog Hadronic calorimeter

  2. Introduction Lead : 8mm Scintillator : 2mm Our plan of Hadronic calorimeter(HCAL) is a Lead/Scintillator sampling type. We study the HCAL by GEANT4 simulation. Hadronic model is GEISHA based.

  3. Y Z X 1 m 100 Layers 1 m 1 cm 1 m Test Detector A scintillator cell 1cm x 1cm x 2mm Total number of cells 1,000,000

  4. Test of PFASet up for Multi particles Iron Block pi- 100GeV 10cm 50cm Multi particle event to simulated jet is generated.

  5. Multi particle event Hit cell energy ( >0.1mips ) in the HCAL Iron Block pi – 100GeV There are hit cells apart from the track. We try to study these cells.

  6. Simulation for Gas Hit cell energy ( >0.1mips ) Iron Block pi – 100GeV You can see the track clearer in Gas than in Scintillator.

  7. Purpose of this study Scintillator is our choice for the HCAL. We study • The hits apart from the track in the scintillator and • The difference in the measurement of the scintillator and the gas.

  8. The green cells are neutron hits. (by G4Track Information) E(neutron) = 50MeV Hit time ( ns ) pi- 4GeV z position ( cm ) A single pion Z The hits are due to neutron scattering.

  9. The effect of neutrons neutron 50MeV Scintillator Gas(Xenon) The box size: 1m x 1m x 1m Neutrons incident at random positions to the pure scintillator and the gas.

  10. no time cut Hit time ( ns ) 10ns 5ns 2ns z position ( cm ) Time cut parameter The neutron hit time is slower than other hits. We study from the view point of the hit cell time.

  11. 4GeV pion Nhit Nhit distribution Hit cell energy > 0.1mip It stands for no time cut. 5 Time cut ( ns ) Number of hit cells (Time Cut Dependence)

  12. Hit time distribution Lead/Sci The hit time distribution for the scintillator is similar to that of the gas after the time cut(5ns). Hit time ( ns ) Lead/Gas

  13. Shower radius To see the effect of the time cut parameter to the hits, we define Shower radius as the mean of the distribution of r(i). where r(i) = for Cell position ( x(i), y(i), z(i) ) r(i) Z 1m

  14. Shower radius (Time Cut Dependence) 4GeV pion r(i) distribution (Hit cell energy > 0.1mip) Shower radius ( cm ) Two SR approach as the time cut is small. Time cut ( ns )

  15. Energy resolution - analog (Time Cut Dependence) 4GeV pion The total energy (Hit cell energy > 0.1mip) Energy Resolution It is independent of the time cut. Time cut ( ns )

  16. Cell energy v.s. r(i)( @Time cut 5ns ) (Hit cell energy > 0.1mip) Lead/Sci Lead/Gas Cell energy ( mip ) Cell energy ( mip ) r(i) ( cm ) r(i) ( cm ) Fluctuation of cell energy is large in the gas.

  17. Summary of analog HCAL(For 4GeV pion) • We can cut the neutron hit cells in the scintillator by the time cut parameter. In using the time cut parameter( 5ns ) • Shower radius Scintillator : 4.2 cm Gas : 3.8 cm • Energy resolution Scintillator : 0.27 Gas : 0.31

  18. Digital calorimeter • We have 1,000,000 cells in the HCAL. • We can try to digital readout. The measurement of the Digital HCAL only count the number of hit cells (Nhit). It is independent of cell energy.

  19. Linearity for pion (1, 2, 4, 16, 32 GeV) pion Data by J.Yamada Nhit for digital Mip for analog Incident energy (GeV) We can use the digital readout for the HCAL.

  20. Resolution of Digital and Analog Resolution Digital 0.62 Analog 0.63 Resolution (incident,GeV)

  21. Nhit distribution(With the time cut parameter : 5ns) Lead/Sci Lead/Gas Nhit Nhit (Hit cell energy > 0.1mip)

  22. 4GeV pion Nhit distribution (Hit cell energy > 0.1mip) Nhit Resolution Time cut ( ns ) Nhit Resolution - digital(Time Cut Dependence)

  23. Summary of Digital HCAL • The ability of Digital HCAL is similar to that of Analog HCAL for pions. In using the time cut parameter( 5ns ) • Nhit resolution (for 4GeV pion) Scintillator : 0.28 Gas : 0.32

  24. Summary • We can control the neutron events in the scintillator by the time cut parameter. In using the time cut parameter • Resolution(analog/digital) of the scintillator is similar to that of the gas. • Shower radius of the scintillator is similar to that of the gas.

  25. Outlooks Time cut The time cut parameter may help for the clustering in PFA. Thank you very much.

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