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Introduction to GEM detectors assembly

33 cm. Introduction to GEM detectors assembly. 10 cm. 10 cm. Leszek Ropelewski CERN. 30 cm. 20 cm. 66 cm. NA61. Totem Upgrade. Compass. Totem. Outlook. Design phase: GEM foils (HV sectors, HV connectivity, stretching method)

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Introduction to GEM detectors assembly

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  1. 33 cm Introduction to GEM detectors assembly 10 cm 10 cm Leszek Ropelewski CERN 30 cm 20 cm 66 cm NA61 Totem Upgrade Compass Totem

  2. Outlook • Design phase: • GEM foils (HV sectors, HV connectivity, stretching method) • Readout boards (electronics connectivity, bonding, connectors) • HV divider • Frames and support structure (spacers, gas flow, protection grooves, choice of materials (electrical stability, outgassing properties, radiation hardness)) • Infrastructure and tools • Components quality control: • GEM foils (optical, electrical) • Readout boards (electrical) • Frames (mechanical, electrical) • Construction: • Clean room (masks, gloves !) • Test after each step ! • Detector commissioning • COMPASS GEM detectors production guide

  3. Design Services : HV, LV, gas, cooling

  4. Design Shielding: RF noise

  5. GEM foils Beam killer • HV sectors – max. 100 cm2 • Holes shape preserved on the borders !

  6. HV divider Soldering ZIF connectors • Cleaning and testing after components mounting is very important ! • HV components • HV values – working point • Coated Kapton soldering • Conformal coating

  7. Readout boards Cartesian Compass, LHCb Small angle Bonding Hexaboard, pads MICE • Bonding is difficult • Input capacitance • Cross talk Soldering Mixed Totem

  8. Frames and support • Mechanical rigidity after foil stretching and gluing ! • Spacers • Gas flow channels; gas connectors • Glue flow preventing grooves

  9. Choice of materials • Only certified materials: • outgassing and ageing test ! • radiation hardness • electrical properties

  10. Tools and infrastructure

  11. Tools and infrastructure

  12. HV ramp up in air 0.5 nA A-segment 14 min spark! in N2 > 5 min B-segment 14 min QC: GEM foils Current measurements under 600 V Optical inspection : hole diameter and defects

  13. QC: Readout boards Interstrip capacitance measurement

  14. QC: Frames and support HV test – 5 kV

  15. Detector assembly • Clean room class 1000 • Temperature, humidity controlled • Protective clothing • Custom-made, simple tools • Only certified materials used: No aging! • HV test after each step • Detailed documentation of each step

  16. Detector commissioning • gas tightness • HV test with Nitrogen • gas gain calibration, uniformity, temporal stability etc.

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