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Innovative MWPC Design for CB Status Report

Detailed report on new Proportional Chambers with cathode readout, segmented cathodes, and features like wires pitch and gas gap. Includes project cost, challenges with folding technique, and advantages of alternative materials. Preliminary project for two MWPCs with specific dimensions and signal considerations.

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Innovative MWPC Design for CB Status Report

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  1. New MWPC for CBStatus Report Oct 2004 • Proportional chambers with cathode readout • Wires // beam axisÞ fcoord • Segmented Cathodes. Strips helically wound in opposite directionsÞz coord • Wires pitch 2 mm • Gas gap 8 mm • Resolution:s(f) » 2o , s(q) » 1o Work by A.Braghieri

  2. First Idea • Cathode made by a double sided FR4 PCB: Fiber glass 100 mm and Cu 17 mm • Large surface of the PCB 1200 x 500 mm2 • Folding technique

  3. PCB Layout

  4. … Folding technique • Cost: 2 KEur/cathode • Folding: very difficult to ensure necessary precision (roundness). Cusp at the border Problems

  5. A more traditional technique • Cathode support: Rohacell • Strips: on a Kapton foil glued on Rohacell Advantages • Cheaper • More transparent • Easy to machine but … • Electrical connection problems (can be solved)

  6. Preliminary Projectfor two MWPCs Ch 2 Ch 1 Inner dia 129 mm Outer dia 205 mm Diameter of the new polarized target » 120 mm

  7. All signals from the upstream part: only 2 chambers can fit inside the available space • The 2 new chambers will be closer than the existing ones ) angular resolution will be ' 1.5 worse than now(sq' 2-3 degr.)

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