Focused microbeam formation for heavy ion beam from AVF cyclotron, 2

Yokota, Wataru; Sato, Takahiro; Oikawa, Masakazu*; Sakai, Takuro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Kashiwagi, Hirotsugu; Kamiya, Tomihiro; Fukuda, Mitsuhiro*

The paper reports the progress in the development of the focusing microbeam formation technique in fiscal 2005, which is under way at the TIARA for application to research fields of biotechnology and semiconductor for space use. A 2-m-diameter microbeam was successfully attained using 260 MeV-Ne in fiscal 2004. The 1.7-m diameters on average were obtained at several experiments in the following fiscal year. This suggested that the microbeams might be usable for a several-hour experiment. The irradiation in the atmosphere was therefore tested for the first time. Furtheremore, a method to reduce an effect of vibration of apparatuses on the beam size was discussed, because 0.6-m amplitude in vibtation of the focusing lens was observed with a laser displacement sensor.