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- M. Oyaizu, S. Arai, M. Okada
KEK, Ibaraki
- Y. Fuchi, Y. Hirayama, N. Imai, H. Ishiyama, S. C. Jeong, H. Miyatake, Y. Watanabe
KEK, Tokai Branch, Tokai, Naka, Ibaraki
- S. Ichikawa, H. Kabumoto, M. Matsuda, A. Osa, Y. Otokawa
JAEA, Ibaraki-ken
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We have successfully converted the singly charged ions of short-lived radioactive nuclei as well as of stable nuclei into the multi-charged ions with the charge-to-mass ratio of about 1/7, by employing KEKCB, an 18GHz ECR charge breeder at TRIAC (Tokai Radioactive Ions Accelerator Complex). However, we observed large difference in charge breeding between gaseous and non-gaseous ion species, i.e. in the injection optics and the resultant charge breeding efficiencies. In order to understand the difference, we investigated how the ions, externally injected to the ECR plasma of KEKCB for breeding their charge states but failed to be re-extracted, were distributed on the wall (surface) of the plasma chamber. To investigate the distribution, we had injected and charge-bred radioactive singly-charged 111In ions with a half-life of 2.9 days. After the operation, we extracted the distribution of the 111In by measuring the residual activity on the wall of the chamber. We have observed an azimuthally asymmetric distribution around the Bmin of axial field configuration on the top of rather symmetric and isotropic distribution, which will be discussed in detail at the workshop.
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