Plasma and Fusion Research
Volume 9, 1405131 (2014)
Regular Articles
- Faculty of Engineering, Aichi Institute of Technology, Toyota 470-0392, Japan
Abstract
Nanostructure formation on molybdenum surfaces due to helium plasma exposure is investigated, with a focus on determining the temperature band for the growth of fiber-form nanostructures. Precise temperature measurements can be obtained using thin thermocouples inserted into sheet specimens. The temperature range for nanostructure growth was determined to be 800 ∼ 1050 K under incident helium ion energies of 50 ∼ 100 eV and an ion flux of 2×1021 m−2 ·s−1. Surface morphologies near the upper and lower boundary temperatures differ from those of a standard fiber-form nanostructure. In a standard case, nano-fibers of molybdenum were found to have diameters of approximately 50 nm, whereas those of tungsten are half of the molybdenum fibers.
Keywords
fiber-form nanostructure, molybdenum, helium defect, surface temperature
Full Text
References
- [1] S. Takamura, N. Ohno, D. Nishijima and S. Kajita, Plasma Fusion Res. 1, 051 (2006).
- [2] M.J. Baldwin and D.P. Doerner, Nucl. Fusion 48, 035001 (2008).
- [3] S. Takamura, S. Kajita and N. Ohno, BUTSURI (Membership Journal of The Physical Society of Japan) 68, 602 (2013) (in Japanese).
- [4] S.I. Krasheninnikov, Phys. Scr. T145, 014040 (2011).
- [5] R.D. Smirnov and S.I. Krasheninnikov, Nucl. Fusion 53, 082002 (2013).
- [6] S. Takamura, Plasma Fusion Res. 9, 1302007 (2014).
- [7] S. Kajita, W. Sakaguchi, N. Ohno, N. Yoshida and T. Saeki, Nucl. Fusion 49, 09005 (2011).
- [8] S. Kajita, T. Saeki, Y. Hirahata and N. Ohno, Jpn. J. Appl. Phys. 50, 01AH02 (2011).
- [9] S. Takamura, T. Miyamoto, Y. Tomida, T. Minagawa and N. Ohno, J. Nucl. Mater. 415, S100 (2011).
- [10] T. Miyamoto, S. Takamura and H. Kurishita, Plasma Sci. Technol. 15, 161 (2013).
- [11] S. Takamura, T. Miyamoto and N. Ohno, J. Nucl. Mater. 438, S814 (2013).
- [12] S. Takamura, IEEJ Trans. 7 (S1), S19 (2012).
- [13] S. Takamura, T. Miyamoto and N. Ohno, Nucl. Fusion 52, 123001 (2012).
This paper may be cited as follows:
Shuichi TAKAMURA, Plasma Fusion Res. 9, 1405131 (2014).