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14th AWAKE spectrometer meeting
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Europe/Zurich
CERN
CERN
AWAKE Spectrometer Meeting, 26/02/2016
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Present: Bart, Stefano (CERN), Fearghus, Lawrence, Matthew (UCL)
Optical line - Bart (with Vincent Clerc)
See slides
- The need for a light-tight enclosure was discussed and deemed necessary because
● Definitely need in case the lights come on.
● Also needed to avoid effects and reduce air turbulence.
- The favoured optical path crosses the tunnel between the main hall and the camera.
● TSG42 not a safety tunnel escape route. So we have more flexibility.
- Why were the configurations with a 2 m mirror rejected even though they look simpler
● Such mirrors would be very expensive to manufacture
● Handling would be challenging and takes up too much space (hard to integrate)
● The support structure would be more challenging and more chance of bending.
- Total length 16.2 m.
- Part of light-tight enclosure in front of the door to the target area needs to be removable to allow passage.
Mirrors - Stefano
See slides
- Design has three mirrors, the first two are about 1 m long, the last mirror about 0.5 m long.
- Two quotes: 4.5 kEUR and 8 k$ for a 1 m mirror. The 0.5 m mirror would be less, but not half the price. Lead times ~ 10 weeks.
- An alternative to optical mirrors focuses on developing accurate mounts.
● The idea is then to design a good mount and use normal mirror.
● Propose to design mounts and test with ordinary mirrors by summer.
- Both scenarios, ordinary and optical mirrors, need mounts and so do this first and then decide on mirrors.
● We do not need mirrors now and so there is no pressure to purchase.
-> Agree that the mount design is the first thing to do.
Vacuum chamber - Lawrence
- See slides
-> To understand the difference between blue and red curves, i.e. what is being stopped by window.
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