1. Reed Research Reactor reactor.reed.edu/pictures.html reactor.reed.edu/pictures.html 1 Moriah Tobin Modeling Quartz Cherenkov Detectors

2.  Why do we need fast timing?  Why Cherenkov?  Simulation Setup  Photo-Detectors  Timing Process  Timing Resolutions  Further Studies 2 Moriah Tobin Modeling Quartz Cherenkov Detectors

3.  Many application  Vertex Measurements of Proton Collisions to 2mm http://www.hep.phy.cam.ac.uk/theory/research/cep.html 3 Moriah Tobin Modeling Quartz Cherenkov Detectors

4.  More Prompt than Scintillation  Cherenkov Angle: http://www.ps.uci.edu/~superk/superk_detector.html 4 Moriah Tobin Modeling Quartz Cherenkov Detectors http://apod.nasa.gov/apod/ap010221.html

5. 5 Moriah Tobin Modeling Quartz Cherenkov Detectors Quartz http://www.instant-analysis.com/Principles/spectra.htm http://refractiveindex.info/?group=CRYSTALS&material=PbF2

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7.  Geant4: A C++ based Monte Carlo simulation program.  ROOT: A C++ based analysis program  Interactions in Geant4  Analysis and photo-detector in ROOT 7 Moriah Tobin Modeling Quartz Cherenkov Detectors

8. 8 p p p p

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10.  Silicon Photo- Multiplier (SiPM)  Micro-Channel Plate (MCP) http://jp.hamamatsu.com/products/sensor- ssd/4010/4025/S10362-33-050C/index_en.html 10 Moriah Tobin Modeling Quartz Cherenkov Detectors SiPM MCP Window shown is 3mm x 3mm Test Beam Used 1cm Diameter

11.  Probability that an incident photon will produce a photoelectron for SiPM and MCP below MCPSiPM 11 Moriah Tobin Modeling Quartz Cherenkov Detectors

12. 20mm 12 Moriah Tobin Modeling Quartz Cherenkov Detectors  Photons reaching detector  Geant4 modeling process well 20mm

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14. 20mm SiPM 14 Moriah Tobin Modeling Quartz Cherenkov Detectors 20mm SiPM 20mm MCP

15. 6mm 15 Moriah Tobin Modeling Quartz Cherenkov Detectors  Jitter: Effect of electronics displaces whole signal  TTS: Effect of electron travel “smears” pulse

16. http://en.wikipedia.org/wiki/File:Constant_fraction_1.svg  Jittered, Spread Pulse 16 Moriah Tobin Modeling Quartz Cherenkov Detectors

17.  Fit CFD times of 1000 protons with Gaussian, find st. deviation 17 Moriah Tobin Modeling Quartz Cherenkov Detectors

18.  Look at Timing Resolution with Signal Correction  Look at Lead Fluoride as a Possible Radiator.  Simulate Blue & Red Filters  Do more QUARTIC setups  Find the Factor of 2  Figure Out Source of Photoelectron Loss 18 Moriah Tobin Modeling Quartz Cherenkov Detectors

19. 19 Moriah Tobin Modeling Quartz Cherenkov Detectors Additional thanks to Roger Dixon, Erik Ramberg, Carol Angarola for their work to make this internship possible, and the DOE Office of Science SULI project.

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