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nTPC Acceptance Study

2007/12/22. nTPC Acceptance Study. M. Uchida. Introduction. nTPC is shifted about 10cm to the downstream. How about acceptance of nTPC system? I estimated the acceptance in some reaction by using Geant4 Monte Carlo simulation. Layout of nTPC system. 2.2T Solenoid magnet 12 Outer scinti.

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nTPC Acceptance Study

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  1. 2007/12/22 nTPC Acceptance Study M. Uchida

  2. Introduction • nTPC is shifted about 10cm to the downstream. • How about acceptance of nTPC system? • I estimated the acceptance in some reaction by using Geant4 Monte Carlo simulation.

  3. Layout of nTPC system 2.2T Solenoid magnet 12 Outer scinti. Time Projection Chamber 6 Inner scinti. LH2 target 6layer DC 4 Forward scinti.

  4. nTPC Scintillator assignment (didsc in Geant4 sim.) TPC Rear view Side view

  5. Reaction

  6. Trigger • Sector x another 1 hit • Sector means coincidence of inner and outer scintillator in the same sector or the scintillators nearby the sector. Reference Real Trigger

  7. Single hit : 3858 in 100000 events Acceptance in Sector 1 Narrow :8749 events Wide : 11494 events Total acceptance 67%

  8. Single hit : 7809 in 100000 events Acceptance in Sector 1 Narrow : 3257 events Wide : 4549 events Total acceptance 27%

  9. Single hit : 1926 in 100000 events Acceptance in Sector 1 Narrow : 5699 events Wide : 7727 events Total acceptance 46%

  10. Outlook • Now I estimated only hit pattern of scintillators. • Next step, I include the tracking information of TPC and DC. • Angular distribution should be included.

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