Results of June 23 Pbar LowBeta La6ce Measurement A. Valishev - - PowerPoint PPT Presentation

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results of june 23 pbar low beta la6ce measurement
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Results of June 23 Pbar LowBeta La6ce Measurement A. Valishev - - PowerPoint PPT Presentation

Dec 03, 2022 39 likes •136 views

Results of June 23 Pbar LowBeta La6ce Measurement A. Valishev Tevatron Dept. Mtg. 7/2/2010 Some Notes Purpose of the measurement: preshutdown documenLng of the machine and understanding of difference between proton and pbar opLcs

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SLIDE 1

Results of June 23 Pbar Low‐Beta La6ce Measurement

  • A. Valishev

Tevatron Dept. Mtg. 7/2/2010

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SLIDE 2

Some Notes

  • Purpose of the measurement: pre‐shutdown documenLng of

the machine and understanding of difference between proton and pbar opLcs

  • This was the first successful la6ce measurement with pbars
  • n pbar helix
  • Standard orbit response measurement with 60 correctors
  • Final convergence of the fit is 20 µm (rms orbit error) which

corresponds to 15% error in β‐funcLon

  • Again had to spend Lme pu6ng BPMs into correct mode
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SLIDE 3

Tunes and ChromaLcity

  • Tunes on pbar helix: Qx=0.5727 Qy=0.5602 (ΔQ=0.0125)
  • “True” tune se6ngs: Qx=0.5688 Qy=0.5664
  • Very low chromaLcity: Ch=3 Cy=3
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SLIDE 4

βx βy

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SLIDE 5

Dx Dy

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SLIDE 6

β* Summary Table

The method does not determine z*

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SLIDE 7

A25 A38 B32 B46 C17 C25 C38 FF “roll” ‐1mrad CDF ‐2 mrad D0

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SLIDE 8
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SLIDE 9

Summary

  • Successfully measured pbar collision opLcs
  • There is a significant beta‐beaLng in the verLcal plane
  • Gradient errors are small, difference between prot and pbar

la6ce mostly in coupling: both at FF triplets and in the arcs.

  • β* values are not very different between proton and pbar
  • rbits