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2015 11 16 LHC Aperture Filtering

  • Typical aperture file used by Collimation group does not have any aperture 'type' information, ie circular, elliptical, racetrack, lhcscreen.
  • This makes it unsuitable really.
  • Thick lattice aperture model on AFS optics v6.503 doesn't run as it has negative lengths (aperture placements -ve from IPs).
  • In both cases, ~90% of information is in markers rather than name matching elements in magnetic lattice (despite being in MADX Tfs format).
  • Many 0, and 10m entries that require filtering.
  • From relatively detailed thick aperture I got to work and filtered 0 and 10m items, there are 33855 aperture definitions for B1.
  • Of 33855, only 31954 are unique - ie duplicate markers.
  • Even more confusingly, some duplicates at the exact same position have different aperture information.
  • Require duplicate removal for accurate element splitting and matching to magnetic lattice.
  • Example of duplicate apertures:

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Screen_Shot_2015-11-16_at_16.48.57.png r1 manage 317.7 K 16 Nov 2015 - 16:49 LaurieNevay Example of duplicate apertures

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Topic revision: r1 - 16 Nov 2015 - LaurieNevay

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