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RIS citation export for TU1C3: Beam-Based Calibration of Sextupole Magnet Displacement with Betatron Tune Shift

AU  - Takano, S.
AU  - Fujita, T.
AU  - Fukami, K.
AU  - Hiraiwa, T.
AU  - Maesaka, H.
AU  - Masaki, M.
AU  - Soutome, K.
AU  - Takao, M.
AU  - Tanaka, H.
AU  - Ueshima, K.
AU  - Watanabe, T.
ED  - Forck, Peter
ED  - Wawrzyniak, Adriana
ED  - Schaa, Volker R.W.
ED  - Kowalski, Grzegorz W.
ED  - Cudek, Agnieszka (SOLARIS, Kraków
TI  - Beam-Based Calibration of Sextupole Magnet Displacement with Betatron Tune Shift
J2  - Proc. of IBIC2022, Kraków, Poland, 11-15 September 2022
CY  - Kraków, Poland
T2  - International Beam Instrumentation Conference
T3  - 11
LA  - english
AB  - The alignment of sextupole magnets is one of the critical issues for the upcoming 4th generation light sources and future colliders. The alignment error of magnets and the beam offsets in sextupoles should be within a few 10 µm rms to ensure enough dynamic aperture for stable operation and minimize deterioration of beam quality. Considering that the quadrupole field in a sextupole is proportional to the displacement (normal Q for horizontal and skew Q for vertical), we propose a beam-based calibration (BBC) method to measure the sextupole centers by observing the betatron tune shift. The magnetic center is the point where the tune does not change regardless of the sextupole field strength. The key is increasing the XY coupling to obtain a tune shift large enough for the vertical calibration. We studied experimentally the feasibility of the sextupole BBC at SPring-8 and successfully demonstrated the principle for both horizontal and vertical calibration. The tune shift was monitored by bunch-by-bunch feedback electronics with approximately 1e-5 resolution. The measurement resolution of the sextupole center was approximately 10 µm std., which was sufficient for our requirement.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 192
EP  - 195
KW  - sextupole
KW  - betatron
KW  - coupling
KW  - target
KW  - experiment
DA  - 2022/12
PY  - 2022
SN  - 2673-5350
SN  - 978-3-95450-241-7
DO  - doi:10.18429/JACoW-IBIC2022-TU1C3
UR  - https://jacow.org/ibic2022/papers/tu1c3.pdf
ER  -