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FPI WP Status

FPI WP Status. Short summary R. Mirzoyan MPI Munich. FPI.

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FPI WP Status

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  1. FPI WP Status Short summary R. Mirzoyan MPI Munich Univ. Padova, Physics Department, Plenary Meeting

  2. FPI • FPI WP includes the front part of the imaging camera: PMTs (light sensors), pixels, clusters, HV power supply, postamplifier, light guide system, protective/sealing window, the camera mechanics and its junction with the mount of the telescope • FPI is working in a very close contact with the ELEC WP Univ. Padova, Physics Department, Plenary Meeting

  3. PMT • Select the most probable size of PMTs (with the help of other WPs: MC, Mount & Mirror) and start development work with companies • Make a request to the CTA consortium to look for possibilities to allocate some finances for the development work in th years 2009-2010 Min. request: 160.-k€/1 year Max. request: 400.-k€/2 years • The major goals: try to achieve a peak PDE ≥ 40 % (PDE = QE x Charge Coll. Eff.) Afterpulsing ≤ (0.03 – 0.01) % Univ. Padova, Physics Department, Plenary Meeting

  4. PMTs • Offers from major PMT manufacturers are obtained. We plan to check in the coming ~4 months some ~ 10 type PMTs of 1-2 inch size at least from 2 manufacturers, in 2 locations SiPM • Evaluate SiPMs from all possible manufacturers that have the promise to become a candidate sensor for CTA. Pay attention to cost, cost/performance issues. Ongoing study Univ. Padova, Physics Department, Plenary Meeting

  5. Light Guides • Which type of production, costs, ease of manufacturing, automatic production, reflectivity, angular acceptance, ageing, ... • Single ones or plates of LGs • Lining or evaporating technique Univ. Padova, Physics Department, Plenary Meeting

  6. Protective plexiglas window • The thickness, uv transmission, minimize the reflection by antireflective coating: • Ask CTA for some funds for the last task; the development scale seem to be 30-50.-k€ (this could reduce the reflectivity from (8-10) % down to ~ 1 % level) Univ. Padova, Physics Department, Plenary Meeting

  7. Slow control aspects of FPI • What shall be read out and controlled, how frequent ? • Single rates above a given threshold • Anode currents • Calibration pulses • Check HV, dc-dc converter supply, control voltages, temperature, humidity, ... Univ. Padova, Physics Department, Plenary Meeting

  8. Mechanics • Weight optimisation, cost issues. • Temperature (stab. ?) and related issues • Humidity and temperature sensors • Sectioning • Protection from dust, humidity (plex. window) • LED system for pointing • Camera doors (lids) • Pop-up mylar foil, maybe also reflective target Univ. Padova, Physics Department, Plenary Meeting

  9. Interaction with other WPs • MC: inputs on pixel size(s), FoV of the camera(s) • Optics: light spot sizes over the camera area, LG and its concentration • Mount: camera weight constraints • Try to provide for the other WPs cost estimates on the pixel, also including the mechanics => • Together narrow the range of candidate PMTs, start development work with the industries Univ. Padova, Physics Department, Plenary Meeting

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