MINUTES OF RICH1 HPD & MECHANICS MEETING
Monday 20th August 2007
Present Bill Cameron, Dave Clark, Richard Plackett, Trevor Savidge.
Upper HPD Box
This week TS will concentrate on the high voltage and cooling connections and the loft conversion piece in the hood.
It would be best to keep the chariot in college so the hood can be fitted to it as its manufactured. This means all the parts need to be sent to the anodisers when they are finished, rather than piecemeal.
The box needs to be completed in he first two weeks of October so it can be shipped to CERN, populated and installed immediately after the magnet tests in the first two weeks of October.
TS will specify the material (thickness) for the hood skin (Al) and patch panels (Delring).
RP will specify the sizes of material needed for the patch panels.
Cooling System
TS will arrange ordering a few of the cooling pipes for prototyping.
These will be braided SS hose with either EPDM (rubber) or PTFE (Teflon) lining.
RP will email Olav or Erich to see if there is likely to be any problem with the coolant attacking the pipe lining.
The EPDM is more flexible but can be prone to failure due to a seam. There are more parts available in the EPDM version.
There is a backup design with rigid pipes but this will require a lot of machining.
RP will order example taps for TS as his CERN access has expired.
Protection Plate
Needs to be ready with the box at the start of October.
We need to decide what material it will be made from, mainly plastic, Delring or G10. Needs to be stiff.
Possibly needs to be reinforced in plastic to prevent sparking?
This needs to be a priority at the next meeting.
More design work need.
HPD Box Additional Systems
RP and BC will work on these this week.
LT-mon PMTs need to be sourced and ordered.
The time alignment fire system needs to be adapted form the RICH2 system.
Both of these will be mounted inside the corner stiffening pieces. This should mean minimal interference with the HPD columns.
Machining Work
Expecting drawings/models to begin to be available for the workshop next week (28th onwards).
End plates and patch panels will definitely be CNC work.
The hood frame might be CNC.
Seals and O rings will not be designed this week, but we will have to produce our own.
We will almost certainly use a black silicone as a sealant.
Screws etc will be standard.
Installation
BC will email people at CERN about the spreader bar.
The installation will be delicate due to the plinth being under the upstream rail.
This means we will have to lift it to close to the correct angle and then move it sideways in z into position.
There is also a possible conflict with the cooling pipes and the slings from the lifting points.
In addition the height available from the crane is not generous.
Minutes by Richard Plackett