AWAKE spectrometer meeting

Friday 7 Oct 2016, 14:00 → 15:00 Europe/Zurich

Present: Bart, Fearghus, Lawrence, Matthew, Simon, Stefano

Optical table - All
- Space is not an issue in the tunnel.
- See no disadvantage of having the largest table.
-> Decided on largest table, 1800 x 900 mm^2.  Bart/Stefano to order and charge to UCL Team Account.

Rack - Bart
- Installation ongoing.  Then will have a rack number.

Cables - All
- Campaign ongoing and so anything we need will be part of next cabling campaign in Apr/May 2017.
-> Bart/Stefano to check on timing/triggering with Heiko,
- Rack will have network cable.
- Cable to / possibility to turn camera off ?
 - Tell MCP not to fire and so should be okay.
 - Check with Andor.  
 - Consider further if hard turn-off is needed

Light covers for optical parts of the spectrometer - All
- Dust on lens ?  Will have a cover and this is one of the areas where we expect more of an enclosure even if the whole path is not completely covered.
-> Bart/Stefano to look at materials which could be used for covers / enclosures ?
-> Do some tests with the camera pointing at the beamline and in end position to measure background ambient light.  Fearghus to specify measurements and what is needed and then to do with Bart/Stefano when he is settled at CERN (arriving next week).

Simulation of optical line - Stefano
-> Determined that mirrors need to be polished.
-> Buying unpolished and asking for 5 Lambda polishing doesn't look possible; companies not keen.
-> Go back to Aurelie's quote of ~4500 EUR for a bespoke (large, 900 mm) mirror looks like the best solution when the large mirrors are just one piece and come polished.
-> Stefano to finish simulation, also to check mirror geometry, and getting quotes for mirrors.
-> Will need to order at least one spare mirror and needs to be considered in costs.
   Will then have overview of sizes, costs and then decide which is the best option.  Current feeling is that the larger mirrors in just one piece is preferable, even if more expensive.

Next meeting: Friday 21 October at 13:00 / 14:00 (UK / CERN time)