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AWAKE Spectrometer optical line meeting
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Europe/Zurich
1/1-025 (CERN)
Meeting Date: 21/09/2016 13:30
Location: 1-1-025
Participants
Bartolomej Biskup (Meeting Organizer)
Plus Vincent Clerc and Thomas Schneider.
Notes
Bart presented the line layout. Paolo checked the mirror dimensions and made a small model. Impression is that the last mirror is vignetting the beam. According to Paolo's preliminary calculation the size of M3 should be more than 2 times. However, a new model with entrance pupil located at camera lenses' plane will be performed to confirm (or not) the results.
It is discussed whether we can split the big mirror in two. This will result in less deformation but the problem is how to align the two halves. The space between the mirrors (should be approximately a few tens of microns) should not be a problem. What is needed from CERN side is to understand if we can tolerate more than 5*lambda mirror flatness.
The need for an active control of the mirror surface is discussed. It is concluded that this is not needed.
Marco suggests for the second large mirror to increase its dimensions so that there is no need to tilt it around the horizontal axis, only the image will be tilted. This will simplify the mechanical mount.
CERN will check with Schott what is the roughness of the mirrors for coating adherence.
CERN will define a target requirement (eg effective resolution of the imaged scintillator screen) to allow to understand if a flatness worse than 5*lambda can be tolerated
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