Difference between revisions of "Minutes-10-11-2012"
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- Vlad showed results of the tests in the vacuum chamber at high temperature (~100degC) where all the samples (cathode traces 0.5mm wide) have wires soldered and he measures their resistance continuously without opening the chamber. Using gas, the EPDM sample showed >1MOhm resistance after 8-10 days, which translated to room temperature is ~100 days or more depending on the activation energy. No changes in the Viton, and Viton+Apiezon resistance after 15 days. New tests started with air at 100degC and 100% humidity. No effects yet after 3.5 days. | - Vlad showed results of the tests in the vacuum chamber at high temperature (~100degC) where all the samples (cathode traces 0.5mm wide) have wires soldered and he measures their resistance continuously without opening the chamber. Using gas, the EPDM sample showed >1MOhm resistance after 8-10 days, which translated to room temperature is ~100 days or more depending on the activation energy. No changes in the Viton, and Viton+Apiezon resistance after 15 days. New tests started with air at 100degC and 100% humidity. No effects yet after 3.5 days. | ||
| − | - Eugene: humidity doesn't seem to be such important factor; if that's the case the gas itself can contribute significantly to the corrosion? | + | - Eugene: humidity doesn't seem to be such important factor; if that's the case the gas itself can contribute significantly to the corrosion? But then one has to explain the Viton/ EPDM difference, and why the corrosion happens at the O-ring. Eugene proposed to do also experiment in air but at low humidity. In the moment the priority of the studies is to investigate the Viton+Apiezon samples at worse possible conditions and then translate the results to the hall conditions. |
== Engineering == | == Engineering == | ||
| − | - Bill | + | - Bill proposes an off-shell Temperature Control Unit (document linked above) to be used in the FDC cooling system. The unit is design for Fluorinert and is ready for use. It will need probably some extra stuff, like flowmeters to detect leakages, RTDs to monitor the temperature, but it general it will work. Bill had some concerns also about the type of the pump used, that can create high pressure, so one has to find a way to control it, as well. |
== Electronics == | == Electronics == | ||
Revision as of 17:42, 11 October 2012
October 11, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Status
- First package assembly
- Corrosion test results (Vlad)
- Engineering temperature control unit(Bill)
- Electronics (Chris, Nick)
- Third package tests FDC E-log (Beni)
- TDR, pages 132-146 (Lubomir)
- Other
