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TY - CONF AU - Yuri, Y. AU - Ishibori, I. AU - Ishizaka, T. AU - Okumura, S. AU - Yoshida, K. AU - Yuyama, T. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Formation of a Uniform Ion Beam Based on Nonlinear Focusing and its Applications at the JAEA TIARA Cyclotron J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - A formation/irradiation technique of large-area uniform beams based on nonlinear focusing of multipole magnets has been developed toward advanced research and efficient industrial applications at the TIARA AVF cyclotron of Japan Atomic Energy Agency. The uniform beam is formed as follows: An ion beam extracted from the cyclotron is multiply-scattered with a thin foil so that the transverse beam intensity distribution can be smoothed into a Gaussian-like distribution, critical to the formation of a highly uniform distribution. Then, the tail of the Gaussian-like distribution is folded into the inside by the nonlinear force of octupole magnets and eventually a uniform intensity distribution can be formed on a target. Typically, the area and uniformity of the beam are over 100 cm² and below 10%, respectively. Such large-area uniform beams have already been applied to radiation degradation testing of space-use solar cells and a study on functional materials in TIARA. In the presentation, the latest R&D results and the utilization status of the uniform beam will be shown. PB - JACoW CP - Geneva, Switzerland SP - 236 EP - 238 KW - ion KW - cyclotron KW - scattering KW - target KW - octupole DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPWA052 UR - http://jacow.org/ipac2015/papers/mopwa052.pdf ER -