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| MOB01 |
Cyclotron Technology and Beam Dynamics for Microbeam Applications |
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- S. Kurashima, H. Kashiwagi, N. Miyawaki, S. Okumura, T. Satoh, K. Yoshida, T. Yuyama
QST/Takasaki, Takasaki, Japan
- M. Fukuda
RCNP, Osaka, Japan
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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.
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Slides MOB01 [26.045 MB]
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