MainPage:Nuclear:KaonDetector:Paper1

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First outline from Dr. Horn, on 07/07/2013.
In green are comments from Marco, on 07/08/2013.

Paper Outline: KAON AEROGEL CERENKOV DETECTOR

INTRODUCTION

• Introduction to physics and infrastructure, i.e., spectrometers in Hall C

• Cite other experiments (approved) that also require the detector?

DESIGN CONSIDERATIONS

• Experiment requirements and motivation for aerogel detector
• Design choices
  • threshold vs. RICH
  • box dimensions and PMT placement etc.
  • choice of aerogel radiators
  • impact on other detectors, e.g., delta electrons
  • impact on other detectors: multiple scattering calculation

CONSTRUCTION AND COUNTER LAYOUT

• Details of the detector box and tray construction
  • Motivation and explanation of materials used in the construction, i.e., aluminum, honeycomb, etc.
  • Details on the fabrication and construction
  • Construction of a frame to hold aerogel in center of box for cases where box not entirely filled
• Short description of detector components
  • Choice of reflective materials, wires to hold aerogel, etc.
  • Aerogel used, i.e., manufacturer
  • PMTs (geometry, properties, details on their installation in detector, i.e., magnetic shielding, aluminum cylinders etc.)
• Construction of a single counter (Prototype) and tests performed with it
  • photoelectron yield for different refractive indexes
  • photoelectron yield for different thickness (number of tiles) of aerogel

AEROGEL STUDIES

• Characterization of aerogel tiles
  • Variation of dimensions and refractive index tile-to-tile and batch-to-batch
  • Optical measurements (transmittance etc.)
  • Photon Yield
  • Humidity effects on aerogel (if available on time)

PHOTOMULTIPLIER TUBES STUDIES

• Measurements of quantum efficiency and photocathode uniformity

-> Do we have Q.E. measurements? Was HMS PMT measured for Q.E.?

MC SIMULATIONS

• Description of the simulation(s) performed, e.g.,
  • predictions of photoelectron signal
  • uniformity of signal
  • average number of PMTs that trigger per event
  • timing resolution of detector
• Light collection efficiency

PERFORMANCE

• Results from cosmic measurements
  • signal from 1.030 and 1.015 aerogel, single column(?)
  • 1.030 to 1.015 signal ratio, for single column of aerogel (can add calculation, prototype and MC ratios for comparison?)

SUMMARY AND OUTLOOK

• Possibility of improvements:
  • additional tray with even lower refractive index (when material becomes available)
• Installation and tests with beam to come