Development of a Laser Wire Beam Profile Monitor (I)

Details Development of a Laser Wire Beam Profile Monitor (I) Development of a Laser Wire Beam Profile Monitor (I)

1999-07-28

arxiv.org/abs/hep-ex/9907054v1

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 10 figures, submitted to Nucl. Instr. and Meth. A

Scientific paper

A conceptual design work and a basic experimental study of a new beam profile monitor have been performed. The monitor will be used to measure emittance of an electron beam in the ATF damping ring at KEK, in which the transverse beam size of about 10 micron is expected. It utilizes a CW laser and an optical cavity, instead of a material wire, 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 built a test cavity to establish a method to measure important parameters such as a laser beam waist and a power enhancement factor. Three independent methods were examined for the measurement of the beam waist. It was found that the cavity realized the beam waist of 20 micron with the power enhancement factor of 50.

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