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    AWAKE spectrometer meeting

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    cascella daq status.pdf
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    Present: Fearghus, Ishkhan, Matthew, Michele, Stefano

     

    Stefano - light calibration

    Discussed issues raised in last meeting:

    - Flat lamp gives flexibility

       - Have some target in front of lamp with e.g. series of points or narrow strip.

       - Can also act like LED by having a mask with just one hole.

    - Ensure that the distance between screen and lamp is as small as possible.

    -> Specifications give relative intensity vertically.

    -> Can calibrate each hole (for given mask) using photometer in the lab to get vertical intensity profile.

    - Motor controlled remotely.  Lamp on/off and intensity can be controlled.  These values are recorded via FESA.

    -> What about blinkers around the screen ?  See if we need to add these around the screen and the light calibration system if needed.

     

    - Order of mirror supports.  Stefano signed this to be charged to BI budget; now needs Ans or Edda's approval.  If the company receives the order by next week, we will receive the parts by mid September.

     

    Michele - camera software tests

    - See slides

     

    Fearghus

    - Needs to get DRZ screen cut. 

      -> To give to Ishkhan on Thursday or next week.  Would like for some part of the August run.

    - Ordered Basler camera for August run. 

      -> Check with Ishkhan and Stefano about optics and lens needed.

    -> [Stefano] cannot find C <-> F mount converter.  Will order one. 

    - Mirror coating: Ishkhan to check on status.

    - Calibration of scintillator response is an issue as we will almost certainly not be able to use the unaccelerated (~15 MeV) electron beam.  Fearghus, Matthew and Michele have been discussing this.

      - Idea would be to have e.g. X-ray source in AWAKE and measure response to this.  Then need to take scintillator and camera to electron test-beam and measure response to electrons and also the X-ray source in this set up.

      - Options to investigate for electron beam:  

        -> Replacement for PHIN injector.

        -> CLEAR has electrons ~ 200 MeV.

      -> Can we use the calibration lamp instead of a radioactive source to measure the response in the AWAKE area.  Do we need an X-ray source or is the lamp sufficient ?

     

    Next meeting, Thursday 3 August at 10:30 / 11:30 (UK / CERN).

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