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A Look into Far Detector Photon Rates Caroline Zhang Calibration Consortium Meeting March 9, 2019 You Inst Logo Content Motivation - Estimate the effect of Ar scintillation light on photo-electric targets in order to understand the

  1. A Look into Far Detector Photon Rates Caroline Zhang Calibration Consortium Meeting March 9, 2019 You Inst Logo

  2. Content • Motivation - Estimate the effect of Ar scintillation light on photo-electric targets in order to understand the suitability of electron calibration using photo-electric effect • DUNE Geometries • PD Area Calculation • Monte Carlo Sample Analysis • Results • Questions and Feedback You Inst Logo 2

  3. DUNE Geometries and Coordinates • Entire FD • 1x2x6 Dimension units cm You Inst Logo 3

  4. Workspace Definition in Geometry GDML Files Definitions of 1x2x6 Geometry in the GDML Files You Inst Logo 4

  5. Photon Bars on APA • Each APA has 10 Photon Bars and there are 1x2x6=12 APAs • meaning 120 Photon bars • You Inst Logo 5

  6. Photon Bars on APA J. Stewart PD bars You Inst Logo 6

  7. Mapping Channel locations .gdml .txt/chart You Inst Logo 7

  8. Current PD Simulation only has1x2x6 Analyzed all the 100 events I have You Inst Logo 8

  9. Photon Counts of 100 events x 120 channels/event The mean of Photon Hits per channel per event is 540.4 You Inst Logo 9

  10. Sum 100 events for each channel (120 total) You Inst Logo 10

  11. Photons counts with Attenuation Effect Removed The average attenuation is 0.4642 You Inst Logo 11

  12. Calculate PD bar area from the gdml file meaning: • Paddle_y = 4x2.54 = 10.16 cm • APAFrame_z = 230.0025 cm • Paddle_z = 230.0025 – 2x4x2.54 - =209.6825cm • Paddle_Area= Paddle y x z = 2130.3742 cm^2 You Inst Logo 12

  13. Photon Rate Calculation The length of the time window per event : 4.492 ms Mean: 1162 Maximum: 2000 Center of the 3 rd peak :1400 The average photon rates is therefore 0.146 photons per cm^2 per ms You Inst Logo 13

  14. Photon Counts (N) across the entire APA Plate Dimension units cm You Inst Logo 14

  15. Distribution of Photon Rates across Y/Z of APA Plate Dimension units cm You Inst Logo 15

  16. Next Step • Think about optimization for electron source metal location and area Any Ideas and Questions? You Inst Logo 16

  17. References • Sample location dune/data/users/ahimmel/2019-02-07-gallery Mahalos You Inst Logo 17

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