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    AWAKE spectrometer meeting

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    Minutes of AWAKE spectrometer meeting - 21/10/2016

    Present:
    Bart, Stefano (CERN)
    Lawrence, Matthew, Michele, Simon (UCL)


    Simulation of the optical line - Stefano

    -> Has received comments to optical simulations and will re-do some simulations based on these.  Update results by end of next week.
        - It seems that a flatter (than 5*lambda)  mirror will be needed and it will then be a trade-off of flatness and cost.
          - Qualitative answer with new simulations.
    - Calibration light.  Issues / options:
      - Option of moveable light and target which can track across the screen.
      - Option of fixed LEDs on vacuum chamber.
      - One light source with diffuser to give vertical extension.
      - Fixed light source which is switched on and off.
      - Frequency of calibration ?
      - Different options can lead to different information; wWhat do we want the calibration light to do ?
        - Distortion / focusing from optical system, check e.g. once a day.
        - Absolute position of screen.
        - Uniformity of optical system and something to give independent measures of screen & mirrors, camera.
      - Additional source of calibration is electron beam but how often can the injected beam be used, i.e. ramping magnet down ?
      -> Will continue to think and discuss this.

    For optical field of view:
      - The height should be from upper bolt centre to lower bolt centre.  What is this value
      - Is the length 1 m ?  Have some tolerance, e.g. +- 1 cm
      -> Double check dimensions with Jan / Nicolas

    Mirrors - Bart / Stefano

    - Mirror coating / protection
      -> Look at doing tests with coating and protection as well as simulations.
        - HiRADMAT have unprotected mirrors.
        -> Thomas can make two mirrors, protected and unprotected and we can test.
      - Coat as appropriate later on; can be done by CERN.
        - A possibility is to order mirrors with no coating/protection asap and do what is needed later.
      -> Ask for quotes for different options

    Infrastructure - Bart / All

    - See slides
      - Rack has arrived
      -> Ethernet cabling could be done and the purchase order is awaiting approval - since approved, but missed the deadline for cabling this time and so will be done in the next cabling campaign.
      -> Optical table to be ordered soon - order since gone out.

    AoB

    - Michele asked about OASIS and in particular who to contact for e.g. costs, etc. and is there an OASIS node near the spectrometer rack.
      -> Bart / Stefano can ask controls who Michele should talk to.
     

    Next meeting 7. 11. 11AM CERN time (10AM UCL time)

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