Transcript CKOV II
Downstream Cherenkov Gh. Grégoire University of Louvain Design study for the Technical Reference Document • Physical constraints • Mechanics • Evaluation of the optics • Electronics MICE collaboration meeting RAL, October 28, 2004 1 T.J. Robert’s simulations At CKOV2 entrance window At MUCAL entrance face 2 Optics 12 identical systems 3 Outer steel shielding Cut along z-axis Low carbon iron cylinder Front panel (iron) Back panel (iron) O-ring O-ring Transverse clamps for window Welds Partially aluminized glass window 4 Elementary module Centering rings and suspension rods for PM tube Hollow wedges (iron) to construct 12-sided polygon Part of back panel (20 mm iron) BNC hole for light pulser Part of front panel (20 mm iron) Longitudinal clamps for window Beam axis 5 Mumetal shielding Mumetal 30° wedge pieces welded to front and back panels Fixation washers of the mumetal to the iron lid Beam axis 6 Basic unit External magnetic shielding (5 mm soft iron) 30° wedge pieces Beam axis 7 Construction of 12-sided ring Single-piece front and back panels welded to the wedge pieces Hollow wedge pieces 8 Pyramidal mirror and exit window PARTICLE EXIT WINDOW: one single piece of 10-mm thick honeycomb with a 1mm Aluminium skin on the inner face Downstream flat mirrors (4 pieces polycarbonate 3-mm thick; glued to honeycomb) 12-sided 45° pyramidal mirror (polycarbonate sheets supported by a honeycomb structure) 9 Aerogel box and entrance window Mirror upstream surfaces (4 pieces polycarbonate 3-mm thick on a 10-mm honeycomb ring; glued to aerogel box) PARTICLE ENTRANCE WINDOW: one single piece of 10-mm thick honeycomb with a 1-mm Aluminium skin on the inner face Aerogel support box (honeycomb) Aerogel tiles (each 113 x 113 x 10 mm) to cover a diameter of ~ 800 mm; 100 mm thick) 10 Transverse cut Cut through the support structure of the reflecting pyramid 11 Longitudinal cut 12 3D view Overall view without the aerogel and the particle entrance window 13 Optics Optical parts implemented into ZEMAX-EE Aerogel 14 Light collection efficiency 500 random light rays from the aerogel exiting through the photocathodes… 15 MC simulations Assume the muons generated by Tom are electrons … Theta X vs Y Momentum Phi 16 Ongoing work Assume the muons generated by Tom are electrons … • Generation of photons inside the aerogel • Propagate through optical sytem • Determine light collection efficiency ~ 60-70 % ( preliminary ) 17 CKOV2 Electronics For Edda Fast electronics For each PM tube 1 discriminator + fanout 1 QDC 12 times ! 1 TDC 1 light pulser + LED driver Data flow 1 QDC and 1 TDC reading per good (muon) candidate 1 trigger for light pulser every n minutes (n?) Slow controls 1 Temperature sensor 1 Humidity sensor 1 Pressure sensor (helium) 12 HV control/monitoring channels (current/voltage) Data flow 1 reading of each per setting (run ?)