@article{oai:repo.qst.go.jp:00047048,
 author = {Hojo, S and Katagiri, K and Nakao, M and Sugiura, A and Muramatsu, M and Noda, A and Okada, T and Takahashi, Y and Komiyama, A and Honma, T and Noda, K and 北條 悟 and 片桐 健 and 中尾 政夫 and 杉浦 彰則 and 村松 正幸 and 野田 章 and 野田 耕司},
 issue = {2},
 journal = {The Review of scientific instruments},
 month = {Feb},
 note = {The Kei-source is a compact electron cyclotron resonance ion source using only permanent magnets and a frequency of 10 GHz. It was developed at the National Institute of Radiological Sciences (NIRS) for producing C(4+) ions oriented for high-energy carbon therapy. It has also been used as an ion source for the NIRS-930 cyclotron. Its microwave band region for the traveling-wave-tube amplifier and maximum output power are 8-10 GHz and 350 W, respectively. Since 2006, it has provided various ion beams such as proton, deuteron, carbon, oxygen, and neon with sufficient intensity (200 μA for proton and deuteron, 50 μA for C(4+), for example) and good stability for radioisotope production, tests of radiation damage, and basic research experiments. Its horizontal and vertical emittances were measured using a screen monitor and waist-scan. The present paper reports the current status of the Kei-source.},
 title = {Status of a compact electron cyclotron resonance ion source for National Institute of Radiological Sciences-930 cyclotron.},
 volume = {85},
 year = {2014}
}