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TY - CONF AU - Kurashima, S. AU - Fukuda, M. AU - Kashiwagi, H. AU - Miyawaki, N. AU - Okumura, S. AU - Satoh, T. AU - Yoshida, K. AU - Yuyama, T. ED - Chrin, Jan ED - Schaa, Volker RW TI - Cyclotron Technology and Beam Dynamics for Microbeam Applications J2 - Proc. of Cyclotrons2016, Zurich, Switzerland, September 11-16, 2016 C1 - Zurich, Switzerland T2 - International Conference on Cyclotrons and Their Applications T3 - 21 LA - english AB - We have been improving a beam quality of the TIARA (Takasaki Ion accelerators for Advanced Radiation Application) cyclotron to form a heavy-ion microbeam with a spot size about 1 μm. The microbeam is used to irradiate such as living cells and semiconductor devices. In order to form the microbeam using focusing lenses, an energy spread on the order of 10⁻⁴ is required to eliminate chromatic aberration in the focusing lenses. A flat-top acceleration system using the fifth-harmonic frequency of the acceleration frequency was installed in the cyclotron to reduce the energy spread. In addition, a new center region, a magnetic field stabilization system and an acceleration phase control technique were developed to provide the microbeam stably for beam users. The energy spread of a 260 MeV Ne beam was reduced to 0.05% by the flat-top acceleration, and the microbeam with a spot size of approximately 1 um was successfully formed. However it takes about 8 h to tune the cyclotron and the focusing lenses. A cocktail beam acceleration technique was introduced to quickly change the microbeam to the other one within 0.5 h, and several microbeams can be used in a beam time as a result. PB - JACoW CP - Geneva, Switzerland SP - 16 EP - 20 KW - ion KW - cyclotron KW - acceleration KW - controls KW - vacuum DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-MOB01 UR - http://jacow.org/cyclotrons2016/papers/mob01.pdf ER -