Proceedings of the 8th International Symposium on BioPIXE; Bled, Slovenia, September 14–19, 2014No Access

Development of a high-current microbeam system

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

E-mail Address: shigeo.matsuyama@qse.tohoku.ac.jp

Corresponding author.

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K. Ishii

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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S. Suzuki

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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A. Terakawa

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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M. Fujiwara

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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S. Koshio

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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S. Toyama

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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S. Ito

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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M. Fujisawa

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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, and

T. Nagaya

Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki-aza-Aoba 6-6-01-2, Aoba-ku, Sendai 980-8579, Japan

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https://doi.org/10.1142/S0129083514400038Cited by:9 (Source: Crossref)

Abstract

We report on the development of a high-current microbeam system for wavelength-dispersive X-ray micro particle-induced X-ray emission (WDX- $μ$ $μ$ -PIXE) for chemical state mapping. The microbeam system is composed of two slits and a quadrupole doublet lens mounted on a heavy rigid support. The microbeam system is installed immediately after a switching magnet. A beam brightness of $2.4 pA \cdot μ m^{- 2} \cdot {mrad}^{- 2} \cdot {MeV}^{- 1}$ $2.4 pA \cdot μ m^{- 2} \cdot {mrad}^{- 2} \cdot {MeV}^{- 1}$ is obtained at a half-divergence of 0.1 mrad. A beam current of more than 300 pA is obtained for object sizes of $40 \times 10 μ m^{2}$ $40 \times 10 μ m^{2}$ with a half-divergence of 0.2 mrad, which corresponds to a beam spot size of $1 \times 1 μ m^{2}$ $1 \times 1 μ m^{2}$ . The calculated spot size of the beam was $1 \times 1 μ m^{2}$ $1 \times 1 μ m^{2}$ and the measured spot size was $1 \times 1.5 μ m^{2}$ $1 \times 1.5 μ m^{2}$ . The WDX- $μ$ $μ$ -PIXE system with the microbeam system is now operational.