CYCLOTRONS 2010 - List of Authors (Kashiwagi, H.)

Paper	Title	Page
MOPCP019	Present Status of JAEA AVF Cyclotron Facility	87
	T. Yuyama, I. Ishibori, T. Ishizaka, H. Kashiwagi, S. Kurashima, N. Miyawaki, T. Nara, S. Okumura, W. Yokota, K. Yoshida, Y. Yuri JAEA/TARRI, Gunma-ken, Japan
	The JAEA AVF cyclotron provides various ion beams mainly for research in materials science and biotechnology such as estimation of radiation hardness of space-use devices, and plant breeding by ion beams. We have been developing ion sources, the cyclotron, and beam irradiation techniques to meet requirements from users. In order to stabilize the beam intensity, power supplies for magnets were improved by installing a digital-to-analog converter (DAC) unit with a Peltier device for coil current control. As a result, coil current stability of main magnet of ± 5 × 10^-6 has been obtained by the renewed DAC unit which guarantees temperature control within 1°C at 30°C. Initially, it took about eight hours to form a heavy-ion microbeam, so it was impractical to change the microbeam ion species in an experiment. However, the microbeam of a 520 MeV 40Ar¹⁴⁺ has been successfully changed to the one of a 260 MeV ²⁰Ne⁷⁺ within 30 minutes using a cocktail beam acceleration technique. A beam profile uniformization system using multipole magnets are being developed to enable uniform irradiation of a large sample at a constant particle fluence rate.

Paper

Title

Page

Present Status of JAEA AVF Cyclotron Facility

87

T. Yuyama, I. Ishibori, T. Ishizaka, H. Kashiwagi, S. Kurashima, N. Miyawaki, T. Nara, S. Okumura, W. Yokota, K. Yoshida, Y. Yuri
JAEA/TARRI, Gunma-ken, Japan

The JAEA AVF cyclotron provides various ion beams mainly for research in materials science and biotechnology such as estimation of radiation hardness of space-use devices, and plant breeding by ion beams. We have been developing ion sources, the cyclotron, and beam irradiation techniques to meet requirements from users. In order to stabilize the beam intensity, power supplies for magnets were improved by installing a digital-to-analog converter (DAC) unit with a Peltier device for coil current control. As a result, coil current stability of main magnet of ± 5 × 10^-6 has been obtained by the renewed DAC unit which guarantees temperature control within 1°C at 30°C. Initially, it took about eight hours to form a heavy-ion microbeam, so it was impractical to change the microbeam ion species in an experiment. However, the microbeam of a 520 MeV 40Ar¹⁴⁺ has been successfully changed to the one of a 260 MeV ²⁰Ne⁷⁺ within 30 minutes using a cocktail beam acceleration technique. A beam profile uniformization system using multipole magnets are being developed to enable uniform irradiation of a large sample at a constant particle fluence rate.