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Homework … Same simulation was done to be tuned off all the sextupole components

Homework … Same simulation was done to be tuned off all the sextupole components at ATF2 new extraction line. Errors ; 0.3mrad for all QF*X, QD*X Coupling correction with local bump Betatron coupling correction by minimizing the beam size at wire scanners.

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Homework … Same simulation was done to be tuned off all the sextupole components

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  1. Homework … • Same simulation was done • to be tuned off all the sextupole components • at ATF2 new extraction line. • Errors ; 0.3mrad for all QF*X, QD*X • Coupling correction with local bump • Betatron coupling correction • by minimizing the beam size at wire scanners

  2. Result of simulation Strengths of the skew quadrupoles were reduced by 1/10. Main coupling source was vertical offset at sextupoles and bends.

  3. Strength of the sextupole components at new ATF2 extraction line was large ! Sextupole components for Bends SBH1X K2 = -0.365 SBH2X K2 = +0.365 Sextupoles in extraction line SF1X K2 = +3.55 SD2X K2 = -3.15 SD3X K2 = +3.15 SF4X K2 = -3.72 These large sextupole fields affects the betatron coupling, even if the vertical orbit is only 1-2mm.

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