Straw bi-weekly meeting

Tuesday 30 Sept 2025, 09:00 → 10:00 Europe/Zurich

20/1-004 (CERN)

Hans Danielsson (CERN)

To be followed up:

• short prototype - validation, measurements (wire tension, straw straightness, HV, ...), FE board
• Toshiba wire investigation - results
• long prototype - Alu tube measurements - results, update drawings of flanges, launch the production
• Minitubes crimp tubes investigation - results

09:00 → 10:00 Updates

Straw Detector - electronic card calculation.pdf

STUDY LONG STRAW PROTOTYPE 29_09_25.pdf

STUDY LONG STRAW PROTOTYPE 29_09_25.pptx

Short prototype:

Peter: 

• succeeded to connect straws to HV board
• don't have FE board yet
• 30 Ohm resistivity from HV board to HV board

 

Tonio: 

• one side - first inserted the crimp tubes into the plugs, then inserted plugs into the straws
• other side - first inserted plugs, then used a tool to insert the crimp tubes
• diameters of crimp tube and plugs are OK

Intermediate prototype:

Long 124-straw prototype:

Zuzana:

• Investigation of Minitubes crimp tubes ongoing
• a sample of a new 30um Toshiba wire given to Stefano to verify coating

 

Hans:

• aluminium tube for the supporting tube delivered to CERN, we are waiting for measurements
• calculation of HV board bending: 
  • PCB is anisotropic, flexural rigidity depends on the material, layers, ... 
  • a simple FR4 board used in the calculation
  • at least one support point needed for both 1.6 mm and 2.4 mm thick boards
  • worst case: no support, 1.6 mm thick board - 1.5 mm deflection 
  • best case: one support, 2.4 mm thick board - 80 um deflection

 

Vincent:

• updated drawings for the supporting tube, provided to the workshop
• updated drawings for the flanges, need to finalize the groove and positioning - depends on the tube shape
• added screws and pins for micropositioners and the protection parts
• moved protection parts before micropositioners
• will add a placeholder for a central screw on the HV board
• discussed supports for gluing with Francois

 

Michal:

• Dubna straws (4pc) came damaged

 

Tonio: 

• need to buy glue
• glued end pieces

 

Peter:

• HV board design will be launched this week (no vaccum restrictions, 2.4mm thickness, one support in the center)