Development of a laser wire beam profile monitor (2)

Hiroshi Sakai, Noboru Sasao, Sakae Araki, Yasuo Higashi, Toshiyuki Okugi, Takashi Taniguchi, Junji Urakawa, Mikio Takano

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We describe in this paper a new beam profile monitor which is suitable for a low-emittance circulating electron beam. The monitor, termed as a laser wire profile monitor, utilizes a CW laser and an optical cavity to minimize interference with an electron beam. A laser beam with a very thin waist is realized by employing the cavity of nearly concentric mirror configuration while the intensity is amplified by adjusting the cavity length to a Fabry-Perot resonance condition. We have built and tested a prototype cavity. It is found that a beam waist of 12 μm and an effective power of 3300 mW were achieved in the laser wire with good long-term stability. It will be installed in the ATF damping ring at KEK, in which a transverse electron beam size of about 10 μm is expected.

Original languageEnglish
Pages (from-to)113-117
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - Nov 21 2000
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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