ELogs/MechanicalEngineering

Electronic Log for Mechanical Engineering

To Do

1. Scintillator stack holder redesign
2. Scintillator machining
3. Peli case scintillator module holder frame
4. SciFi frame and holder
5. Kria and carrier board installation in Peli 1510 case
6. Alignment frame
7. Cover/Alignment plates and markings
8. Nozzle mount

Items 1–5 to be completed by end of May

Items 1–5 to be completed by 18th September

Redesigned scintillator stack holders

• Moving from 2-sided to 4-sided readout
• Sheet thickness reduced from 3mm to 2.5mm
• Updating photodiodes from S12915-16R single element photodiodes to S12362-021 16-element arrays.
• New DDC boards are H-shaped to accommodate updated USB-C cable routing and 4-sided photodiode arrays.
• Redesigned stack holders need to accommodate thinner scintillator sheets — and therefore a reduction in stack thickness from ≥96mm to ≥80mm — with identical transverse dimensions of 100mm x 100mm.
• Mounting plate needed to interface with new Peli case support frame.

Scintillator machining

• Scintillator thickness needs to be reduced from 3mm to 2.5mm to accommodate photodiode spacing in new arrays.
• Injection moulded sheets do not have parallel large faces.
• Lower quality “opaque” sheets need surface finishing improved.
• Machine all sheets down to 2.5mm for new stacks.
• At least 128 sheets needed for 4×32-sheet modules.

Peli case scintillator module holder frame

• Change QuARC module and SciFi mounting system in Peli case to make modules easier to install and remove.
• Raise support rails from the base of the Peli case to approximately level with the lid hinges.
• Keep shock absorber mounts in base to retain vibration isolation.
• Include mounts for new Kria box: mount under rails but with USB-C connectors visible.
• Include mount points for nozzle mount.
• Rigid mechanical structure needed with fixed mount points for travel plus adjustable fixation for calibration test removal.

SciFi frame and holder

• X and Y scintillating fibre arrays already mounted into frame.
• New mounting plate needed to match new support rails.
• Front-end interface boards for new Hamamatsu S17285 photodiode arrays coming from Pete Hastings (Oxford): will need mounting on top of S17285.

Kria and carrier board installation in Peli 1510 case

• Kria carrier board designed around specific case.
• Case needs mount points underneath scintillator module rails.
• Ensure USB-C sockets are accessible outside rails.

Alignment frame

• Previous beam measurements have indicated misalignment between cover plate markings and in-room lasers.
• Frame needed to sit outside Peli case that aligns with cover plate markings.
• Frame should be placed over Peli case to check alignment markings.
• Frame should be free-standing to sit on couch to check alignment.

Cover/Alignment plates and markings

• Cover plates need enlarging to cover larger entry/exit windows.
• Make cover plates out of thinner material so that they don't have to be removed.
• Add precision marking to box lid to ease in-room alignment.

Nozzle mount for detector enclosure

• Small Peli case needs to be nozzle-mounted for beam tests.
• SJ in contact with Prague/IBA for mounting points for Prague-IBA nozzle.
• Dimensions already obtained from UCLH measurements:
  • SJ has contacted UCLH to check whether we can bypass light curtain.
  • Assume we can't and design to bypass mechanically...
• 3 parts needed:
  1. Nozzle mounting plate that sits inside nozzle using range modulator plate mounting slots.
  2. U-bracket that slots in to this mounting plate — bypassing the light curtain — with a 40 x 30 cm hole for the beam to pass through.
  3. Peli Case support that fixes to the U-bracket and holds the Peli Case whilst gantry is rotating.