Straw bi-weekly meeting

Tuesday 5 Aug 2025, 09:00 → 10:00 Europe/Zurich

Hans Danielsson (CERN)

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To be followed-up:

vacuum vessel recovery
gas connection (long proto): L-shaped connector, position on the side of the manifold
material of spacers
HV and RO boards wrt straw layout
- make them rounded to have more space on the sides
- only read out a "cross" of straws - gain space in the corners
gas manifold material
how to ensure planarity of HV and FE boards
how to guide the support tube in the vacuum vessel
guides or rails for turning the supporting tube in the vacuum vessel
alignment and positioning of the support tube wrt vacuum vessel
tooling
if we had long straws, should we equip the intermediate prototype first?

There are minutes attached to this event. Show them.

- 1
  Updates
  
  Speaker: straw-proto-wg
  
  Update-August19.pdf
  
  Update-August19.pptx
  Short prototype:
  
  Zuzana:
  
  ultem and brass pieces machined, will be delivered to apropriate labs for metalization this afternoon
  
  thorough review of drawings has begun
  
  Peter:
  
  solution to bring HV connection outside - produce new PCB
  
  Intermediate prototype:
  
  Zuzana:
  
  researching companies to manufacture ultem and brass pieces for straw HV connection
  
  waiting for Minitubes crimp tubes (delivery probably delayed due to company being closed until August 18)
  
  Long prototype:
  
  Zuzana:
  
  recovery of the vacuum vessel has begun
  
  Peter:
  
  RO side: plastic pin in the center of the flange to ensure planarity of the HV board
  
  gas manifold should be made of Optalloy
  
  very limited space for electronics in the corners and on the sides
  
  Spacers: due to cross-talk, it is better to use glass fiber - kapton sandwich
  
  Vincent:
  
  added ball bearings to the support tube