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Phys. Rev. ST Accel. Beams 5, 122801 (2002) [10 pages]

Measurement of a small vertical emittance with a laser wire beam profile monitor

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Hiroshi Sakai *, Yousuke Honda, and Noboru Sasao †
Department of Physics, Kyoto University, Kyoto 606-8502, Japan

Sakae Araki, Hitoshi Hayano, Yasuo Higashi, Kiyoshi Kubo, Toshiyuki Okugi, Takashi Taniguchi, Nobuhiro Terunuma, and Junji Urakawa
High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan

Mikio Takano ‡
Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan

Received 31 March 2002; revised 2 December 2002; published 17 December 2002

We describe in this paper a measurement of vertical emittance in the Accelerator Test Facility (ATF) damping ring at KEK with a laser wire beam profile monitor. This monitor is based on the Compton scattering process of electrons with a laser light target which is produced by injecting a cw laser beam into a Fabry-Perot optical cavity. We installed the monitor at a straight section of the damping ring and measured the vertical emittance with three different ring conditions. In all cases, the ATF ring was operated at 1.28 GeV in a single bunch mode. When the ring was tuned for ultralow emittance, the vertical emittance of εy=(1.18±0.08)×10-11   mrad was achieved. This shows that the ATF damping ring has realized its target value also vertically.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.5.122801
DOI: 10.1103/PhysRevSTAB.5.122801
PACS: 07.60.Ly, 41.75.Ht, 42.60.Da

* Present address: High Energy Accelerator Research Organization (KEK), Ibaraki, Japan.
† Corresponding author. Email address: sasao@scphys.kyoto-u.ac.jp
‡ Present address: National Institute of Radiological Sciences (NIRS), Chiba, Japan.

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