Presentation on theme: "E-field calculations for the TPC/HBD N. Smirnov Upgrade Working Group Meeting 05/13/03, BNL."— Presentation transcript:
E-field calculations for the TPC/HBD N. Smirnov Upgrade Working Group Meeting 05/13/03, BNL.
100 MeV e - 20 cm 55 cm 70 cm CsI Photocathode Fast, Compact TPC with enhanced electron ID capabilities 2 x 55. cm 16 identical modules with 35 pad-rows, double (triple) GEM readout with pad size: 0.2x1. cm². Maximum drift: 40-45 cm. “Working” gas: fast, low diffusion, good UV transparency.
miniTPC module, proposed variant 16 identical miniTPC modules with the Drift distance 48. cm and its own Field Cage Common gas volume with double windows “working” gas – CH4, but another gases (mixtures) will be studied to select the best and convenient one. Shape: trapezoid, Cathode: Kapton or Mylar Field Cage: Kapton or Mylar with printed strip structure (for bottom and sides, wires for a top) N of Pad-rows: 35 Pad dimention: 1.x0.2 cm2 All construction (support) elements: low mass composites material like STESALIT. 5400 readout channels / module 86500 / Detector Anode (Gas amplification, ReadOut): microPattern Gas Detector(s) with Printed pad structure on Kapton or Mylar ( GEM, microMeGas,…)
Points should be checked Low mass construction “good” quality of Electric Field “work together” with Cherenkov Detector Simulation: to demonstrate that the construction approach is “reasonable” Full scale prototype: real answer
MAXWELL and GARFIELD were used to simulate an Electric Field Cathode Anode +/- 20 cm 80 strips, 3 mm width, 5 mm step. Cathode, 36 kV 30 cm 10 cm 40 cm Y X 5 mm