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Status of Tevatron Chromatic Correction Sextupole Commissioning

Jerry Annala April 16, 2007 . Status of Tevatron Chromatic Correction Sextupole Commissioning. Motivation for Sextupole Modifications previously reported by Alex Valishev. Improved Luminosity Lifetime New working point Smaller tune footprint Eliminate 2 nd order chromaticity

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Status of Tevatron Chromatic Correction Sextupole Commissioning

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  1. Jerry Annala April 16, 2007 Status of Tevatron Chromatic Correction Sextupole Commissioning

  2. Motivation for Sextupole Modifications previously reported by Alex Valishev • Improved Luminosity Lifetime • New working point • Smaller tune footprint • Eliminate 2nd order chromaticity • Lower linear chromaticity? J. Annala Tevatron Chromatic Correction Sextupole Status

  3. New Tevatron Working Point • Currently operating between 4/7 and 3/5 with beam-beam x = 0.02 • To increase number of particles need more tune space – WP near ½ should allow 40% more! • However, vicinity of half-integer increases sensitivity to quadrupole errors, especially chromatic • Moreover, large chromatic b-function is detrimental to beam-beam effects even at present WP Work done by: Alex Valishev J. Annala Tevatron Chromatic Correction Sextupole Status

  4. 2nd Order Chromaticity J. Annala Tevatron Chromatic Correction Sextupole Status

  5. Sextupole Loop Schematic J. Annala Tevatron Chromatic Correction Sextupole Status

  6. Implementation Plan • Switch to new PS in original polarity – Run at same current as T:SF and T:SD • Turn new circuits off and compensate with T:SF and T:SD. Run HEP stores this way. • Reverse Polarity of half of the elements on the new circuits. • Begin tuning up new circuits to reduce second order chromaticity. J. Annala Tevatron Chromatic Correction Sextupole Status

  7. Status • Switched loads to new supplies in orginal polarity. • Polarity checked all elements with beam. • Tuned up B2 drift at injection and snapback. • Have begun tuning up the ramp and squeeze with new circuits running at zero amps. J. Annala Tevatron Chromatic Correction Sextupole Status

  8. Vertical Orbits at start of study(Feb 28) J. Annala Tevatron Chromatic Correction Sextupole Status

  9. Smoothed Orbits through 800 GeV(April 6) J. Annala Tevatron Chromatic Correction Sextupole Status

  10. Tunes on the ramp J. Annala Tevatron Chromatic Correction Sextupole Status

  11. Before HEP store with new sextupoles at zero • Re-do orbits one more time • Decouple two more slots on ramp • Insure orbit is correct at a few special locations • Run Proton only store on helix • Do high intensity 12X0 Proton only store J. Annala Tevatron Chromatic Correction Sextupole Status

  12. Correction of b-function Chromaticity (Alex Valishev) J. Annala Tevatron Chromatic Correction Sextupole Status

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