Spatial Variation of Light Yield with Reflector Foils Daniel - - PowerPoint PPT Presentation

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Spatial Variation of Light Yield with Reflector Foils Daniel Cookman 16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman Methodology Used the dune10kt_v1_1x2x6_withfoils_lib.root file obtained from Diego Garcia-Gamez (had

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Spatial Variation of Light Yield with Reflector Foils

Daniel Cookman

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Methodology

  • Used the dune10kt_v1_1x2x6_withfoils_lib.root file
  • btained from Diego Garcia-Gamez (had to modify

to reconcile a missing job)

  • Contains photon visibility data for both direct VUV

& reflected visible light: proportion of photons generated in a given voxel that hit a given optical channel

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman 3

[Slide courtesy Diego Garcia-Gamez!]

Empty region: Voxels 1458000 – 1458499 inclusive Overlap region: Voxels 1459500 – 1459999 inclusive

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Methodology

  • Built a “toy-MC” simulation to look at Light Yield as a

function of drift-distance, x

  • Generated 10 MeV energy depositions randomly within a

3D region of the geometry:

  • x = [10, 330] cm
  • y = [-600,600] cm
  • z = [300, 1000] cm
  • This is the “middle-third” of the simulated geometry,

typical for most of the DUNE detector.

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Methodology

  • From photon library, determined number of photons hitting

the detectors by:

𝑂𝛿 = 𝑄𝑝𝑗𝑡𝑡𝑝𝑜 𝑊𝑗𝑡𝑗𝑐𝑗𝑚𝑗𝑢𝑧 ⋅ 𝐹 ⋅ 24,000𝛿 𝑁𝑓𝑊 ⋅ 𝑅𝐹

  • Assumed (unless specified otherwise) that the detectors

have same sensitivity to VUV & visible light

  • Binned into x-voxel-planes; used mean & stdev for plots
  • Varied cathode reflector foil coverage, as a limited coverage

might be needed to allow for neutralisation of +’ve ions

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman 6

Light Guide Bars

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≈2.2p.e/MeV ≈ 0.3p.e/MeV

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≈1.8p.e/MeV

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≈1.6p.e/MeV (Within uncertainties for 80%)

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ARAPUCAs (Estimates from same photon library)

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

ARAPUCA Transmission Possibilities

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WLS VUV (direct) Visible Visible (Reflected)

?

VUV (direct) Visible (Reflected) No WLS

  • ARAPUCAs can be covered with a WLS or left uncovered (as in SBND)
  • For covered detectors, the extreme possibilities are that it is equally

sensitive to visible light & VUV, or that it doesn’t let visible through at all.

  • Truth lies somewhere between! Planning tests with VUV

spectrometer.

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Option 1:

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WLS VUV (direct) Visible Visible (Reflected)

1) – Inclusive

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1) – Inclusive

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1) – Inclusive

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1) – Inclusive

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Option 2:

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WLS VUV (direct) Visible Visible (Reflected)

2) – Exclusive

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2) – Exclusive

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2) – Exclusive

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Bonus: Plots if ARAPUCA sensitivity is up to 2.5%

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1) – Inclusive

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2) – Exclusive

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

Summary

  • Looked at Light Yield response vs. distance when cathode reflector

present for bars; notable improvement in LY at large 𝑦 (~7× for 100% cathode)

  • Estimated similar plots for ARAPUCAs with various parameters; can
  • btain roughly-uniform LY in either WLS scenario by having

coverage at 30-40%, though total LY is decreased

  • If ARAPUCA sensitivity is boosted to 2.5% LY passes enhanced

technical requirement of 10 p.e./MeV even with conservative parameter estimates

  • I have selected a few plots here, but have numerous more pre-

generated if asked for!

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16 July 2018 DUNE Photon Detector Simulation Meeting Daniel Cookman

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