MINUTES OF RICH1 HPD & MECHANICS MEETING
Monday 16th April 2007
Present Dave Clark, Richard Plackett, Trevor Savidge, Gabriel Vidal & Dave Websdale.
Mirror Mechanics
The standoffs requiring 'V' shaped grooves machined out of them have bee completed.
The 3 brass adjusters have been delivered form AC precision and appear to be the same as the once manufactured by Bristol.
The brass claws for the adjusters are going to be made next, along with the clevis pins required.
The flat mirror top rail still has several parts still outstanding. These will not be completed for over a week due to holidays in the workshop.
DW has brought the spherical mirror feet back from CERN as they need some skimming (anti-shimming), one requires a flat cut and one a cut at a non trivial angle. DW and GB to calculate.
The original two flat mirror plates only have 2 (rather than 4) 'V' blocks made for them. DC has found the drawings for these and will begin making two more.
HPD box
TS has completed the photon funnel drawings for tender. These are consistent with the drawings/volume given to Ray for the design of the MDM.
It does not appear necessary to prototype the seal between the photon funnel and the plinth of the HPD box.
The top frame of the PF is not very robust and may have to be fabricated from several pieces to provide stiffening rather than being machined from a single plate.
The downstream corners of the PF have been changed to square rather than rounded to allow more space to fit the MDM motors.
The photon funnel catchments design is underway, there is some possible interference with the gas enclosure patch panel.
The PF will pull up a maximum of 10mm in the current design.
The frames of the photon funnel will be approximately a third of the weight of the prototype used downstairs.
The extension for the HV patch panel looks possible now that the design of the hood is progressing.
Lower HPD box
DW reports that Brian Otwell (sp?) from oxford will design the lower HPD box rail system, including a mechanism to rotate it around the Z axis rather then the X axis as previously considered.
Minutes by Richard Plackett