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PMT

High Energy Neutron No Veto, Small Prompt Energy Deposit. . . . . . Capture on Gd, Gammas (spread over 40 μ s). . . . . . Hadronic Shower. 40 cm. 50 cm. Liberated Neutrons. Veto. Liquid Scintillator. Gadolinium Loaded. PMT. PMT. Lead. Veto. Veto. 200 cm.

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PMT

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  1. High Energy Neutron No Veto, Small Prompt Energy Deposit      Capture on Gd, Gammas (spread over 40 μs)      Hadronic Shower 40 cm 50 cm Liberated Neutrons Veto Liquid Scintillator Gadolinium Loaded PMT PMT Lead Veto Veto 200 cm One of four in depth

  2. Muon Veto, Large Energy Deposit High Energy Neutron No Veto, Small Prompt Energy Deposit              Capture on Gd, Gammas (spread over 30 μs)         Hadronic Shower Liberated Neutrons Veto Liquid Scintillator Gadolinium Loaded PMT PMT Lead Veto Veto

  3. time 40 μs Neutron Event Shower Initiation, backsplash, proton recoil Muon Event PMT Signal Neutron captures dE/dx

  4. Winston Cone PMT/Base Mirror Neutron Multiplicity Counter 35 cm 440 kg Gd/Liquid Scintillator in box 50 cm PMT/Base 200 cm

  5. Scintillator Box 50 cm 50 cm Top/Bottom/Sides: ¼” thick Acrylic or PVC; if opaque line with Chemflour white plastic (see MACRO paper) 200 cm Bottom… need strongback (?), levelling feet… want top scint surface to not touch the box top Ends…clear… Acrylic, mirrors inside or out (?)

  6. Discrim First Pulse Stretch (30 μs) Gated Scaler ≥n Data Acquisition Waveform Digitizer VME DAQ Computer Neutron Detectors Amp PMT Trigger OR Veto Detectors History Buffer

  7. Organization • Simulation / Physics Design (CWRU) • Neutron Detectors • Design (UCSB) • Prototype (UCSB) • Fabrication (UCSB) • Testing (UCSB) • Soudan Commissioning (CWRU/UCSB) • Veto Detectors (UCSB(?)… FNAL?) • Calibration System • Electronics • DAQ • Data Analysis

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