LhARA pre-CDR Meeting 20th Dec 2019

Meeting dedicated to discussion of interface between source and capture Gabor lens.

Material:

• Required aperture size versus distance from source -- J. Pasternak
• Initial thoughts on Gabor lens design -- C. Whyte

Present: KL, CW, AK, JPas, OE

Notes:

• CW:
  • Laser diagnostics are required and while the space that they occupy should be reduced, it is unclear that the distance source to aperture can be reduced to make the the hole significantly smaller.
  • Also, debris that comes through the hole will cause contamination within the volume of the lens.
  • Consequence is that capture lens needs to be designed to accept poor vacuum and significant particle contamination.
  • Various mitigations to large hole (8mm hole at 10cm). This could be small-diameter mylar (or other material) window. Even may need to accept a solenoid rather than a Gabor lens.
• OE: raised issue of particle diagnostics in addition to the laser diagnostics/laser set-up.

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