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First Production Chambers

First Production Chambers. Production/tests/results. Nov/Dec: Vist from Oleg and Sasha (Dubna): Parallel production of 2 chambers at Heidelberg Test of chambers: Christmas 2003-January 2004. New(s) (Challenges): -Glueing of Padplane-panel-assembly (100 cables have to be fed trough holes)

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First Production Chambers

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  1. First Production Chambers Production/tests/results TRD Collaboration meeting GSI Clemens Adler

  2. Nov/Dec: Vist from Oleg and Sasha (Dubna): Parallel production of 2 chambers at Heidelberg Test of chambers: Christmas 2003-January 2004 New(s) (Challenges): -Glueing of Padplane-panel-assembly (100 cables have to be fed trough holes) -Wacosit Profile extruded in final shape (easier to use than standard G10 parts) -Winding machine after modifications Production of first Chambers TRD Collaboration meeting GSI Clemens Adler

  3. Feeding cables trough Backpanel cutouts worked well Glueing of Padplane to Honeycomb works, but can still be improved Padplane glueing TRD Collaboration meeting GSI Clemens Adler

  4. Wacosit is behaving good, minor quality improvements are discussed with Manufacturer Wacosit profiles TRD Collaboration meeting GSI Clemens Adler

  5. Oleg glueing Anode wires Wiring TRD Collaboration meeting GSI Clemens Adler

  6. All current materials behave well. Tooling needed: Positioning of wire ledges, Distance ledges Crane for lifting of winding frame (installed in January) New winding frames (arrived) What we learned: TRD Collaboration meeting GSI Clemens Adler

  7. Dark current: (Was a Problem with Prototype chambers) At first dark current started at ~1400-1500V. After some conditioning (over night at <50 nA) Dark Currents <1 nA Leak Rate Gain uniformity Tests TRD Collaboration meeting GSI Clemens Adler

  8. Grounding of Padplane: Adhesive copper tape: not reliable Foldback clips, w. conductive foam: Complicated to use ->use of PCB with real connectors to ensure reliable grounding of Padpane while testing (in devel.) Gas filling: Issue: time Procedure: flush Chamber with 80-100 l/h Ar/CO2 with open Gas-in-outlets. 1000 ppm O2 level after 2-3 h. Connect outlet etc. and flush at 20 l/h overnight ->few ppm level next morning Preparation for tests TRD Collaboration meeting GSI Clemens Adler

  9. Determined by measureing O2 concentration (and assuming diffusion leaks) Upper limit: 1,5-3 mbar*l/h Test chamber performance: <0,5 mbar*l/h Problem:very large leaks (some l/h) will also show „reasonable“ leak rates (<3mbar*l/h) with O2 method. Solution: Check that gas exits chamber down to low flow rates (1 l/h) Use sniffer to detect leaks Leak rate TRD Collaboration meeting GSI Clemens Adler

  10. Leakage of two connected chambers: Sniffer could detect leaks at gas connections. ->grease should be used to improve leak rate Leak rate cont. TRD Collaboration meeting GSI Clemens Adler

  11. Left: copper tape grounding Below: foldback clips Gain Uniformity Chamber1 TRD Collaboration meeting GSI Clemens Adler

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