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Status of the R&D and final 3GEM module developement. L.Shekhtman

This article discusses the status of R&D and final development of 3GEM modules. It includes aging tests with 3x3cm and 10x10cm detectors, as well as the mounting procedure for the large module. The article also presents the first measurements and results obtained from the tests.

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Status of the R&D and final 3GEM module developement. L.Shekhtman

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  1. Status of the R&D and final 3GEM module developement. L.Shekhtman • Aging tests with 3*3cm and 10*10 cm 3GEM • detectors - Mounting of the large module and the first measurements 1

  2. Aging tests Procedure: • Before the test • Install collimator on top of the mesh to define the same area for • UV and X-ray irradiation • Measure current from the photo-cathode to the mesh • Put additional UV absorbers to get the current from PCB at ~<1nA/cm2 • with gas amplification in 3GEM of ~5000-10000. Test: • continous irradiation with Hg-lamp, record current from the PCB • periodically (once per 1-2h) close irradiation with the shutter, connect • the preamp. to the pad, introduce Fe55 source and measure PH-spectrum 2

  3. Aging tests Extraction before and after the test Result of the test with 3*3cm 3GEM 3

  4. Aging tests Input for calculation of accumulated charge in HBD: Number of MIPS per collision = 100 Number of collisions per second=10000 Charge per MIP = 10e Gain = 10000 HBD area = 10000cm2 Result of the test with 10*10cm 3GEM 4

  5. Close to final GEM design Kapton > ~400 mm Holes: 140 um pitch 80/60 um diameter 19mm 3mm 3mm Top segment, 5mm Exact segmentation scheme for the top side: 46 segments of 5mm + 1 segment of 7mm 241mm 237mm 241mm Operational area (holes), 228mm 5 4mm for SMD resistors Copper coated area, 232mm

  6. Mounting procedure 2.Application of glue to the frame 1.Stretching on a stretching device 6

  7. Mounting procedure 4.Soldering resistors to the segments 3.Alignment of the stretching frame with respect to the glueing jig and GEM frame. - Glueing (1day) - Cutting out. 7

  8. Mounting procedure Mounting 3GEM module on the flange. GEM is ready for mounting 8

  9. First results with final module Stability (not corrected for P/T) Gain vs GEM voltage 9

  10. First results with final module Gas output Gas input Gain non-uniformity 10

  11. Conclusions - No aging of both photocathode and GEMs have been observed up to accumulated charge of 150 mC/cm2 - Further studies of the initial stage could be useful - Mounting procedure for the final module is established - Gains up to 10000 and more are obtained - Performance is more stable than for 10*10 cm GEMs - Gain is very non-uniform (gas, GEM, mounting) 11

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