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Estimating Acceptance of nTPC System Using Geant4 Monte Carlo Simulations

This study focuses on the acceptance of the new Time Projection Chamber (nTPC) system, which has been shifted approximately 10cm downstream. Using Geant4 Monte Carlo simulations, acceptance metrics were estimated for various reactions involving the nTPC system alongside a 2.2T solenoid magnet and multiple scintillator detectors. The acceptance findings reveal varied hit patterns across sectors, with total acceptance rates reaching up to 67% in specific configurations. Future work will aim to incorporate tracking data from the TPC and DC to enhance the analysis.

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Estimating Acceptance of nTPC System Using Geant4 Monte Carlo Simulations

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Presentation Transcript

  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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