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Straw bi-weekly meeting
To be followed up:
- short prototype - validation, measurements (wire tension, straw straightness, HV, ...), FE board
- Toshiba wire investigation - results
- long prototype - calculation of flange deflection, launch the production of remaining parts at CERN
- long prototype - HV board design - progress
- measure alignment of spacers in the intermediate prototype
- documentation of procedures and results
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Short prototype:
Michal:
- HV test ongoing
- The setup is ready for connecting the readout system to the powered detector.
Intermediate prototype:
Tonio&François:
- 2 straws are already glued (vertically) - OK
- straw tension measurement -- should be 400 g tension (in the elastic mode), measured at 3 bar
Michal:
- Measurement of the straw sag finished.
- Tension for the straw installation defined - ready for gluing and crimping.
Long 124-straw prototype:
Vincent:
- launched calculation of deformation of flanges due to vacuum (see calculations in Vincent's slides)
- central support for the HV board -- need to define distance between the HV and the next board
- omnitrack ball -- missing some tolerances in the drawing
- gluing system -- some discussion about the placement and mounting of the "gluing" board
- handles -- might interfere with the HV connection to the board -- may be needed to remove the handles? or put the handles in the corners?
- holes in the HV board -- every second hole should have a screw/connection, the other holes will serve for the second board; Michal -- alternatively, we can use "double screws"
Peter:
- board design -- submitted; managed to "overtake" other orders
Tonio&François:
- Minitubes crimp tube - pull test results?
Zuzana:
- masks for ultem parts look promising
- current material is well suited for use in vacuum, however it can withstand temperatures only up to 60°C
- there is an alternative material with higher temperature tolerance (90°C) and same precision (could not be tested this time because the machine is broken)
- meeting with Danish company about development of a new procedure for metalization of HV connectivity components
- change of material? (ultem, peek, peek with glass fibre)
- more layers? (Ti, Cu, ?, Au)
- tests needed to verify adhesion, gold immersion into underlayer, resistance against scratching in bath
Hans:
- supporting tube ready and measured (results attached)
- production of flanges and other missing parts to be launched later - calculations needed for the flanges thickness (vacuum), deformed flang and angled straw holes can cause bending
- HV test ongoing
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