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MI8 line study result Update

This update outlines a study conducted on MI Line, focusing on orbit analysis, emittance fitting, and identifying sources of error. The study includes data on beam abort, BPM data, multiwire profiles, and lattice analysis. Adjustments were made to scaling and transfer constants to improve accuracy. Issues with vertical beam sigma and dispersion data are addressed for a comprehensive analysis.

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MI8 line study result Update

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  1. MI8 line study result Update 04/22/2014 Ming-Jen Yang, MI

  2. Study on April 8th • 1-bump orbit • HT800, HT804, HT806, and HT808 • VT803, VT805, VT807, and VT809 • Dispersion data • from -1600 Hz to +1600 Hz. • Data • Beam abort on first turn. • BPM data • from MI8 line up to MI40. • Multiwire data • MI8 line + 4 in MI ring. • MW829

  3. Multi-wire horizontal profiles

  4. Multi-wire vertical profiles

  5. Scaling to new 8-GeV • Main Injector • I:MIBEND, I:IQF, and I:IQD • Recycler • Dipoles • Bend angles are just between SGD and PGD. • Scaled by .9939251. • Quadrupoles • Transfer constants changed from 1.0 to .993925 • Multipoles • Upstream end shim fields scaled. • All others scaled transfer constants. • MI8 line • All fields in permanent magnets stay the same.

  6. HT800 1st order orbit

  7. HT804 1st order orbit

  8. HT806 1st order orbit

  9. VT803 1st order orbit

  10. VT805 1st order orbit

  11. VT807 1st order orbit

  12. Dispersion function

  13. Coupling in MI8 line

  14. Orbit analysis • Multi-wire data • Fit all profiles for position and sigma. • Examine 1-bump orbit • With new 8-GeV energy. • Quad focusing adjustments. • Coupling in the MI8 line. • Match dispersion function eta • Compare measured eta with model • Adjust initial eta and eta' values. • Coupling • Based only on horizontal plane to vertical. • Non-linear vertical dispersion function • Most visible in vertical plane data • Likely source of error in vertical eta.

  15. Dispersion data, vertical plane

  16. Dispersion data, horizontal plane

  17. Lattice analysis • Fitting horizontal plane beam sigma • Horizontal emittance and dpop. • Fitting vertcial plane sigma • Vertical emittance only • Vary initial alpha and beta in each plane • And do the emittance fitting. • Looking for best fit to the profile sigma.

  18. Sigma, horizontal plane

  19. Sigma, vertical plane

  20. Issues • Vertical plane beam sigma • Not matching well starting at mw851. • Possible profiles spoiler • Incomplete first turn abort • Re-visit 1-bump orbit data • Remove data set with beam being clipped. • Possibly looking at the 4th data set for any sign of inconsistency.

  21. Incomplete first turn abort in MI

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