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COD and optics distortion due to QF41 misalignment. Shinji Machida ASTeC /STFC/RAL 2 December 2010. Recent alignment found. QF41 was 6.5 mm closer to QD41 (N. Bliss.) May cause d istortion of orbit and twiss parameters. No effect on vertical COD

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cod and optics distortion due to qf41 misalignment

COD and optics distortion due to QF41 misalignment

Shinji Machida

ASTeC/STFC/RAL

2 December 2010

recent alignment found
Recent alignment found
  • QF41 was 6.5 mm closer to QD41 (N. Bliss.)
  • May cause distortion oforbitand twiss parameters.
    • No effect on vertical COD
  • Let us estimate them witha hard edge model.
closed orbit distortion by qf41 1 pattern
Closed orbit distortion by QF41 (1)pattern
  • A kink at the location of QF41 and regular waveinthe rest.
  • Full COD amplitude of less than 1 mmwhenQh=7.539 at 18.4 MeV/c.
closed orbit distortion by qf41 2 tune dependence
Closed orbit distortion by QF41 (2)tune dependence
  • COD can be a few mm when tune is closed to an integer.
  • Still not enough to explain observed COD.
optics distortion by qf41 1 pattern
Optics distortion by QF41 (1)pattern
  • Both H and V beta functions aredistorted.
  • (top) without error.
  • (bottom) with error.
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