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THGEM: PROTOTYPE DEVICE

THGEM: PROTOTYPE DEVICE. Fulvio Tessarotto. Design of the first prototype Production of THGEM foils The prototype assembly Tests in the laboratory Test in the COMPASS beam. Drawings of the first prototype. We started from the design of the prototype structure and

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THGEM: PROTOTYPE DEVICE

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  1. THGEM:PROTOTYPE DEVICE Fulvio Tessarotto Design of the first prototype Production of THGEM foils The prototype assembly Tests in the laboratory Test in the COMPASS beam Fulvio TESSAROTTO

  2. Drawings of the first prototype • We started from the design of the prototype structure and • the mechanics of its test box • The prototype test box contains: • a quartz radiator • a wire cathode frame • the THGEMs and spacer frames • a segmented collection anode pcb • We hope to perform the test of the first prototype using muons of the COMPASS beam or halo and a quartz radiator to generate Cherenkov photons. Fulvio TESSAROTTO

  3. THE PROTOTYPE STRUCTURE wires 1st THGEM (CsI here,external face) 2nd THGEM collection anode apertures for gas circulation read-out Quartz radiator (truncated cone) Fulvio TESSAROTTO

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  15. Photon Detectors Fulvio TESSAROTTO

  16. THGEM production for the prototype following the preliminary indications coming from the laboratory tests, the geometrical parameters of our first THGEM prototype have been defined: Thickness: 0.20 mm Holes diameter: 0.20 mm Pitch: 0.50 mm Material: fiberglass + 17 μm thick Cu Active area: 10 cm х 10 cm Fulvio TESSAROTTO

  17. THGEM production process Raw material Resist covering CNC drilling Rim if needed Electrodes etching Fulvio TESSAROTTO

  18. 10 cm x 10 cm THGEM Fulvio TESSAROTTO

  19. THGEM: HV connections Fulvio TESSAROTTO

  20. THGEM: edge and holes Fulvio TESSAROTTO

  21. THGEM: edge and holes Fulvio TESSAROTTO

  22. THGEM: edge and holes Fulvio TESSAROTTO

  23. THGEM: holes 0.5 mm 0.2 mm Fulvio TESSAROTTO

  24. Anode with 256 pads Fulvio TESSAROTTO

  25. Anode pcb, connector side Fulvio TESSAROTTO

  26. Anode pcb, glued on Al frame Fulvio TESSAROTTO

  27. Anode pcb, glued on Al frame, with smd connectors Fulvio TESSAROTTO

  28. Initial test configuration • Read-out for the initial tests: as for the MAPMTs • Replacing the cover with the quartz radiator with a mylar/aclar foil: test the device as ionizing particle detector Fulvio TESSAROTTO

  29. PLANNING • Lab tests, no CsI • Beam tests, no CsI • Trigger prepared in 888, at the end of the hall, to trigger on halo (or beam) mu’s • If possible, apply CsI on the external surface of the first THGEM  Test with quartz radiator ! Fulvio TESSAROTTO

  30. A. Braem CsI evaporation plant Fulvio TESSAROTTO

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