Straw bi-weekly meeting

Tuesday 2 Sept 2025, 09:00 → 10:00 Europe/Zurich

20/1-004 (CERN)

Hans Danielsson (CERN)

To be followed up:

• which straws to use for the long 128-straw prototype - ideally Dubna or Sefar
• need to keep track of parts during wiring
• Minitubes crimp tubes
• check that all holes for screws are present (fixation, support, tooling, ...) on the flanges of the long 128-straw prototype
• tooling
• vacuum tube recovery
• plan and test how to replace a straw in the long prototype
• find solution for HV connection of Lamina straws
• work on a solution for metalization and cleaning of Ultem parts

 

09:00 → 10:00 Updates

STUDY LONG STRAW PROTOTYPE 01_09_25.pdf

STUDY LONG STRAW PROTOTYPE 01_09_25.pptx

Status presented at Straw WG meeting yesterday: https://indico.cern.ch/event/1582173/

Short prototype:

Johan:

• new HV board will be ready in mid-September, Michal will bring it to the workshop

 

Hans:

• we should equip all 4 straws and use this prototype for testbeam

Intermediate prototype:

Hans:

• Temur promised straws in October
• we should wait with gluing straws
  

 

Michal:

• no news about endplugs
• 2 Sefar and 2 Lamina straws can be used
• we could use NA62 crimp tubes

Long 124-straw prototype:

Zuzana:

• Minitubes crimp tubes delivery expected this week

 

Hans:

• ordered the tube for supporting tube through main workshop
• contacted Euromec to ask for quote for machining the supporting tube
• calculated HV board deflection (worst case scenario), one pillar in the center should be enough, will see more with simulation

 

Vincent:

• changed the gas manifold, both sides are the same
• need to add holes for screws, 2cm apart - Peter should review it
• gas connection is done - OK
• added a few segments to protect the xy positioners and to simplify manipulation with the supporting tube
• added a cone for spacer position verification
• info: spacers are currently a little bit larger thatn the tube, so they need flexible ears
• tooling - under study
• guidance system - under study

 

Peter:

• needs a single file with straw positions, shape and size of the gas manifold for the HV board designer
• not sure if there is enough space for electronics
• if we only equip "a cross" of straws, there will be enough space to move a source along the tube