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Optimal Tuning of Sextupole Components for ATF2 Extraction Line Simulation

A simulation focused on tuning off all sextupole components at the new extraction line of ATF2, reducing errors to 0.3mrad for QF*X, QD*X. Coupling correction achieved via local bump and minimizing beam size at wire scanners. Strengths of skew quadrupoles reduced by 1/10. Main coupling source addressed by adjusting sextupole and bend vertical offsets. Sextupole components at ATF2 extraction line adjusted for optimal performance. Large effects of sextupole fields on betatron coupling explored.

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Optimal Tuning of Sextupole Components for ATF2 Extraction Line Simulation

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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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