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Journal Articles

High-resolution beam energy-spread measurements using combination of nuclear resonant reactions and a 0$$^{circ}$$ beam line separation

Ishii, Yasuyuki; Chiba, Atsuya; Uno, Sadanori; Saito, Yuichi; Mizuhashi, Kiyoshi; Tajima, Satoshi*; Kamiya, Tomihiro

Nuclear Instruments and Methods in Physics Research B, 260(1), p.15 - 19, 2007/07

https://doi.org/10.1016/j.nimb.2007.01.273
 Times Cited Count：1 Percentile：13.78(Instruments & Instrumentation)

Measurement of beam energy spreads caused by an accelerator are needed to evaluation the choromatic aberration when ion beams with micorometer or nanometer sizes are formed at a focusing point. A measurement method of the beam energy spreads without using a analyzing magnet with a high resolution was developed to evaluate the chromatic aberration in a light-ion micorbeam system connected to the 3MV JAEA single-ended accelerator. The accurate beam energy spread measurement method within a resolution of 10$$^{-4}$$ was developed using resonance nuclear reactions with narrow energy spreads of $$^{27}$$A$$ell$$(p,$$gamma$$)$$^{28}$$Si and $$^{24}$$Mg(p,$$gamma$$)$$^{25}$$A$$ell$$ in a MeV energy range. Furthermore, ion species separating method, in a 0-degree beam line connected to the accelerator, was developed using parmanent magnets attached on the accelerator tube in the accelerator. The two kinds of developmet resulted in measuring baem energy spreads generated from the accelerator directly.

Journal Articles

Heavy-ion induced current through an oxide layer

Takahashi, Yoshihiro*; Oki, Takahiro*; Nagasawa, Takaharu*; Nakajima, Yasuhito*; Kawanabe, Ryu*; Onishi, Kazunori*; Hirao, Toshio; Onoda, Shinobu; Mishima, Kenta; Kawano, Katsuyasu*; et al.

Nuclear Instruments and Methods in Physics Research B, 260(1), p.309 - 313, 2007/07

https://doi.org/10.1016/j.nimb.2007.02.010
 Times Cited Count：4 Percentile：34.86(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Focusing high-energy heavy ion microbeam system at the JAEA AVF cyclotron

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

Nuclear Instruments and Methods in Physics Research B, 260(1), p.85 - 90, 2007/07

https://doi.org/10.1016/j.nimb.2007.01.280
 Times Cited Count：42 Percentile：91.48(Instruments & Instrumentation)

A high-energy heavy ion microbeam system has been developed in an ion accelerator facility, TIARA of JAEA Takasaki. This was the first trial to focus heavy ion beams with an energy range of a few tens MeV/n from an AVF cyclotron accelerator in the world. The focusing system equipped with a quadruplet quadrupole magnet lens, multi beam collimators and beam scanners has been optimized following almost the same way as that of previously developed microbeam system in TIARA. However the ion beams from the cyclotron accelerator has a larger energy variation $$Delta$$E/E and also has a larger beam current instability $$Delta$$I/I than those of electro-static machine in general. We had to overcome these biggest problems in microbeam forming. This paper will outline the new focusing system we have developed in TIARA, and show the results of 1 $$mu$$m resolution by secondary electron mapping method and of single ion hit experiment for the track detectors and semiconductor test devices.

Journal Articles

Improvement in beam quality of the JAEA AVF cyclotron for focusing heavy-ion beams with energies of hundreds of MeV

Kurashima, Satoshi; Miyawaki, Nobumasa; Okumura, Susumu; Oikawa, Masakazu*; Yoshida, Kenichi; Kamiya, Tomihiro; Fukuda, Mitsuhiro*; Sato, Takahiro; Nara, Takayuki; Agematsu, Takashi; et al.

Nuclear Instruments and Methods in Physics Research B, 260(1), p.65 - 70, 2007/07

https://doi.org/10.1016/j.nimb.2007.01.278
 Times Cited Count：10 Percentile：57.91(Instruments & Instrumentation)

no abstracts in English

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