Emittance measurement at KEK-ATF damping ring

H. Hayano, K. Kubo, T. Mitsuhashi, T. Naito, N. Terunuma, N. Toge, J. Urakawa, T. Okugi, S. Kashiwagi

Research output: Contribution to conferencePaperpeer-review

9 Citations (Scopus)


In order to achieve an extremely low emittance down to εy to approximately 1×10-11 m-rad, the beam development has been continued at KEK-ATF for future linear collider. The emittance measurement in the damping ring is a key point to confirm the low emittance beam. The beam size measurement is done by SR interferometer using visible light (approximately 500 nm) at ATF damping ring. The measured beam sizes were already reached less than 14 μm (vertical) and 37 μm (horizontal), respectively. The beta function was also measured by applying a perturbation on the quadrupole magnet. The dispersion function was measured by means of rf frequency modulation method. Combining these measured values, the emittance was measured as εx = 1.8×10-9 m-rad, εy = 6.1×10-11 m-rad. The measurement technologies are described.

Original languageEnglish
Number of pages3
Publication statusPublished - 1999 Dec 1
Externally publishedYes
EventThe 18th Biennial Particle Accelerator Conference - New York, NY, USA
Duration: 1999 Mar 271999 Apr 2


OtherThe 18th Biennial Particle Accelerator Conference
CityNew York, NY, USA

ASJC Scopus subject areas

  • Engineering(all)


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