Yorita T, Hatanaka K, Fukuda M, Ueda H, Kibayashi M, Morinobu S, Tamii A
Research Center for Nuclear Science (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan.
Rev Sci Instrum. 2012 Feb;83(2):02A335. doi: 10.1063/1.3671748.
As the upgrade program of the azimuthally varying field (AVF) cyclotron is at the cyclotron facility of the RCNP, Osaka University for the improvement of the quality, stability, and intensity of accelerated beams, an 18 GHz superconducting (SC) ECR ion source has been installed to increase beam currents and to extend the variety of ions, especially for highly charged heavy ions which can be accelerated by RCNP AVF cyclotron. The production development of several ions such as B, O, N, Ne, Ar, Ni, Kr, and Xe has been performed by Yorita et al. [Rev. Sci. Instrum. 79, 02A311(2008); 81, 02A332 (2010)]. Further studies for the beam transport have been done in order to improve the beam current more for injection of cyclotron. The effect of field leakage of AVF main coil is not negligible and additional steering magnet has been installed and then beam transmission has been improved. The emittance monitor has also been developed for the purpose of investigating correlation between emittance of beam from ECR ion sources and injection efficiency. The monitor consists with BPM82 with rotating wire for fast measurement for efficient study.
由于方位角变化场（AVF）回旋加速器的升级计划在大阪大学核物理研究中心的回旋加速器设施进行，目的是提高加速束流的质量、稳定性和强度，已安装了一台18 GHz超导（SC）电子回旋共振离子源，以增加束流并扩展离子种类，特别是对于可由大阪大学核物理研究中心AVF回旋加速器加速的高电荷重离子。Yorita等人已开展了硼、氧、氮、氖、氩、镍、氪和氙等几种离子的产生研究[《科学仪器评论》79, 02A311(2008); 81, 02A332 (2010)]。为了进一步提高注入回旋加速器的束流，已对束流传输进行了深入研究。AVF主线圈的场泄漏效应不可忽视，因此安装了附加的导向磁铁，从而提高了束流传输。还开发了发射度监测器，用于研究电子回旋共振离子源束流发射度与注入效率之间的相关性。该监测器由带有旋转丝的BPM82组成，用于快速测量以便进行高效研究。
