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TY - CPAPER AU - Naito, T. AU - Mitsuhashi, T.M. TI - Beam Halo Measurement Utilizing YAG:Ce Screen J2 - Proc. of International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 AB - At the ATF2 project, we are aiming to produce an extremely small beam having a vertical beam size of 37 nm. The beam halo surrounding of beam core will make a background for the beam size measurement using the Laser interferometer beam size monitor. The understanding of beam halo distribution is important for measurement of the beam size at the final focus point of ATF2. In order to measure the beam halo distribution, we developed a beam halo monitor based on fluorescence screen. A YAG:Ce screen, which has 1 mm slit in the center is set in the beam line. The image on fluorescence screen is observed by imaging lens system and CCD camera. In this configuration, the beam in the core will pass through the slit. The beam in the surrounding halo will hit the fluorescence screen, and we can observe the distribution of beam halo. The intensity contrast of beam halo to the beam core is measured by scanning the beam position for the fixed fluorescence screen position. The results of observation of beam halo are presented. PB - JACoW CY - Geneva, Switzerland SP - 373 EP - 376 KW - vacuum KW - electron KW - damping KW - laser KW - scattering DA - 2016/01 PY - 2016 SN - 978-3-95450-176-2 DO - 10.18429/JACoW-IBIC2015-TUPB024 UR - http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/tupb024.pdf ER -