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Phys. Rev. ST Accel. Beams 7, 064203 (2004) [7 pages]

Observation of beam-size blowup due to half-integer resonance in a synchrotron

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Tomonori Uesugi, Takashi Fujisawa, and Koji Noda
National Institute of Radiological Sciences (NIRS), Anagawa, Inage-ku, Chiba 263-8555, Japan

Yoshinori Hashimoto, Shinji Machida, and Yoshiharu Mori
High Energy Accelerator Research Organization (KEK), Oho, Tsukuba-shi, Ibaraki 305-0801, Japan

Hiroshi Uchiyama
Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

Received 5 January 2004; published 22 June 2004

Beam blowup due to a half-integer resonance was observed in the HIMAC synchrotron with a nondestructive two-dimensional beam-profile monitor. As the betatron tune approached a half-integer, the vertical beam size became larger by about 13%. The measured rms beam size is in good agreement with a space-charge-included numerical simulation.

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© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.7.064203
DOI:
10.1103/PhysRevSTAB.7.064203
PACS:
29.27.Bd, 41.75.–i, 29.20.–c