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Ferrara production center

Ferrara production center. R. Overview Of Operations. R. Production Readiness Review. P. Operations overview. Clean room. WGS machine: Wiring, gluing, soldering, pitch measurement WTM table: wire cutting, side bars gluing, wire tension measurement, open air HV test (single panel)

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Ferrara production center

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  1. Ferrara production center R Overview Of Operations R Production Readiness Review P W.Baldini

  2. Operations overview Clean room • WGS machine: Wiring, gluing, soldering, pitch measurement • WTM table: wire cutting, side bars gluing, wire tension measurement, open air HV test (single panel) • Assembling table: chamber assembling • Service table: HV connections, mylar tape on HV bar A, repairing/fixing problems Outside the clean area • Gas leakage test • OPB mounting and soldering • Conditioning / HV test of the chamber • Uniformity test with source (?) W.Baldini

  3. Clean room operations Panels entering the clean room have been cleaned already (outside the clean area and in the grey room) and have been checked for geometry and general quality • Preliminary operations • Mounting the clamps to fix the panels on the frame (4 in the corners + 3 along each side of the panel) • Positioning / alignment of panels on the frame • Check of half gap height • Protect the cathode with a Kapton foil • Final cleaning of wire pads with Isopropylalcohol corners HV bar A W.Baldini HV bar B

  4. Screwed to the frame Reference surface Clamp for the panel Clean room operations • We had problems with wires touching the HV bars, this was due to too high HV bars and to the presence of some tin in the points where the fixing clamps go • The HV bars height has been reduced (in Potenza), the clamps have been slightly modifiedand the tin will be put only after the wiring W.Baldini

  5. Clean room operations Operations on the WGS machine • Wiring • While wiring we prepare the guard wires and the glue dispensers (about 5 min before the end of the wiring process) • Put the guard wires • Gluing • Soldering • Measurement of the wire pitch (for the first chambers we plan to measure the pitch after each process ) • Turn the frame and repeat the operations • Rough cut of the wires W.Baldini

  6. Clean room operations Expected times Preliminary operations: right now it takes about 60-70 min W.Baldini

  7. Clean room operations Operations on the WTM table • Soldering of HV connections • Gluing of the side bars • Precise cut of the wires • Wire tension measurement (for the moment 1 panel at a time). We plan to measure 2 panels at the same time, it needs about half a day of work. • HV test in air of single panel At this point, if all the quality tests are passed (conditions will be shown in the traveler), the panel is ready to be put on a chamber and will be stocked in the shelf: “ready to be assembled” W.Baldini

  8. Clean room operations Assembling of the chamber • We assemble the chamber using the same tooling used in Frascati • We plan to distribute the glue automatically (not yet implemented). This allow a better control of the amount of glue • The height of the chamber is measured (while assembling) in 14 points for each layer A 7 1 8 14 B W.Baldini

  9. Clean room operations Assembling of the chamber • We observe some discrepancies form the expected heights, this could be due to: • Too high pressure on the panel from the “forks” • Some discrepancies in thickness and planarity of the panels The problem is still under investigation W.Baldini

  10. Clean room operations HV_side A 1 7 L1 = 9.50 L2 = 23.46 L3 = 37.24 L4 = 51.14 L5 = 64.86 9.56 23.48 37.13 50.93 64.87 9.70 23.51 37.14 50.92 64.80 9.35 23.39 37.08 50.96 64.82 9.82 23.55 37.20 51.09 65.00 9.78 23.52 37.17 51.02 64.99 9.84 23.90 37.56 51.5 64.93 16 8 15 9 B 8.98 23.31 36.92 50.84 64.76 9.04 23.29 36.82 50.84 64.67 8.88 23.32 36.83 50.77 64.66 9.01 23.30 36.86 50.58 64.67 9.27 23.39 37.05 51.09 65.46 9.09 23.34 36.69 51.04 64.90 9.01 23.64 36.87 50.8 64.75 Assembling of the chamber The height of all the layers is measured with a micrometer while assembling the chamber. Exp. Values: L1 = 9.00 mm L2 = 23.00 mm L3 = 37.00 mm L4 = 51.00 mm L5 = 65.00 mm W.Baldini

  11. Operations outside the clean area Once the chamber has been assembled it is moved outside for the following operations: • Gas leakage test • OPB mounting • Conditioning/HV test of the chamber: It’s not clear yet how much time it will take the chamber conditioning. We have anyway space for 20 chambers (8 weeks production) in the rack for the conditioning. • Uniformity test with source (??) W.Baldini

  12. Flow in from the bottle Differential manometer Operations outside the clean area Gas leakage test Requirements: P<=2mb/h @ 5 mb overpressure The system has been tested with sealed volumes Chamber 1 is under test, at present it shows a very high gas leak W.Baldini

  13. Quality control Wire pitch measurement Pitch distribution after the gluing and soldering processes Pitch distribution right after wiring Side A Pitch distribution after the gluing of the wires Side B Some fine tuning is still needed (optimize the contrast of the images) W.Baldini

  14. Quality control Wire pitch measurement Side A P489 (L1) P535 (L2) Side B Chamber 1 Side A: 99.7% < ± 50µm 100% < ± 100 µm Side B: 95.9% < ± 50µm 99.5% < ± 100 µm Side A: 99.8% < ± 50µm 94.4% < ± 100 µm Side B: 99.7% < ± 50µm 99.8% < ± 100 µm P491 (L3) P428 (L4) Side A: 91.0% < ± 50µm 95.4% < ± 100 µm Side B: 91.0% < ± 50µm 91.4% < ± 100 µm Side A: 100% < ± 50µm 100% < ± 100 µm Side B: 99.7% < ± 50µm 99.8% < ± 100 µm W.Baldini

  15. Photodiode Laser Machanical excitation wire Panel Quality control Wire tension measurement This simple and reliable method has been developed together with Firenze and Roma II W.Baldini

  16. Quality control Photodiode Laser Mechanical Excitation Wire tension measurement At present it takes about 3.5 sec/wire (about 40 min/panel) With 2 panels it will take less that 2 sec/wire (40 min 2 panels) We are confident to setup the double panel measurement in about half a day of work W.Baldini

  17. Quality control Wire tension measurement After the reinforcement of the frame p173 Before the reinforcement of the frame The wire tension is in average too high (> 75g) it will be reduced by 5 g W.Baldini

  18. Quality control Wire tension measurement L1 L2 Chamber 1 T = (77.3± 4.0) g T = (76.4 ± 3.6) g L3 L4 T = (76.3 ± 4.3) g T = (76.1 ± 4.6) g W.Baldini

  19. So far we have produced 15 M2R3 panels, the best 8 panels have been assembled in M2R3-CH0 and M2R3-CH1 W.Baldini

  20. Conclusions • All the production and quality control processes are set and working. There are still some fine tuning needed (2 panels measurement with WTM, fine adjustment in the pitch measurement ) but they are essentially in their final version • So far we have produced 15 M2R3 panels and we have assembled • 2 chambers. The very first one (M2R3-CH0) was used essentially to exercise the assembling procedure, the second one (M2R3-CH1) is at present under leak test but it shows a high gas leak. • We have to improve the chamber assembling • The procedure to optimize all the production steps is almost in its final version • The learning process of all the people involved is under way W.Baldini

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