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TRD Production Status Update: New Findings, Challenges, and Plans

Summary of the recent TRD status meeting at GSI Clemens Adler discussing voltage divider change, leak tightness, new winding frame design, soldering issues, and production plans.

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TRD Production Status Update: New Findings, Challenges, and Plans

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  1. TRD (Pre-)Production Status • New Results/Experiences • Problematic issues • Production Plans • Timescale TRD status meeting GSI Clemens Adler

  2. Voltage Divider Change • Was: 5.85 MOhm -> field cage current =360 uA • Double resistance: 11.7 MOhm -> field cage current = 180 uA Compares to 0.5 uA Ion back drift current Savings in Power Supplies? TRD status meeting GSI Clemens Adler

  3. Leak Tightness of Prototype • Leak rate (determined for PRR): 1,5mbar*l/h • Gas sniffer shows leak in Padplane: ->some contact hole not glued • No other significant leaks found TRD status meeting GSI Clemens Adler

  4. Winding Frame New Winding Frame Design tested: • seems very stable • little contact area-> wire slips easily Probably design change necessary... TRD status meeting GSI Clemens Adler

  5. Soldering • Hotbar reflow soldering machine is ordered • Soldering will be done at IKF Frankfurt • Soldering on bare copper seems feasible • Tests at Panacol planned • Problem: need >10 micron tin to solder: -Padplane: silkscreen solderpaste then reflow in oven -Cable: apply tin by dipping TRD status meeting GSI Clemens Adler

  6. Soldering cont. More open questions: -Positioning of Cables: Aluminum template which gives Cable position-> fix with Tesa -Storage of Padplanes (IKF or Hd)? -Table for Soldering machine: build by IKF TRD status meeting GSI Clemens Adler

  7. Padplane Test Setup Measurement for shorts/contact by capacitance measurement. Principle works, but too much noise. Needed: Hardware TRD status meeting GSI Clemens Adler

  8. Production Plans • Material for chamber frame arrives next week • Start production of chamber frames+radiators • Start wiring as soon as ledges/ windingframe/ wire ready. • Store frames with wires until padplane panel ready • Start bonding as soon as padplanes are available • Final assembly when Fischer panel is available TRD status meeting GSI Clemens Adler

  9. Timescale TRD status meeting GSI Clemens Adler

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