H. Hayano (KEK)
The wire scanners are used for a measurement of the very small beam size and the emittance in Accelerator Test Facility(ATF). They are installed in the extraction beam line of ATF damping ring. The extracted beam emittance are ex=1e-9 m.rad, ey=1e-11 m.rad with 1.3GeV energy. The wire scanners scan the beam by 105m tungsten wire with beam repetition 0.78Hz. There are 50um tungsten wire for x, y, u size measurement and 10um tungsten wire for x, y, u, and 10 degree tilted size measurement. They are mounted on the precise mover stage with precise position read back monitor. The scanning speed is, however, very slow( ~500um/sec). Since the extracted beam is quite stable by using the double kicker system, precision of the size measurement is less than 1um for 10 - 20um vertical beam size. The detail of the system and the performance are described.
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