Plasma and Fusion Research
Volume 3, 002 (2008)
Letters
- Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603, Japan
- 1)
- National Institute for Fusion Science, Toki 509-5292, Japan
- 2)
- The Graduate University for Advanced Studies, SOKENDAI, Hayama 240-0193, Japan
Abstract
Ablation of a solid hydrogen pellet in hot plasmas of Large Helical Device (LHD) has been studied. A position sensitive detector (PSD) diagnostics has been newly installed to measure the trajectory of ablating pellets. 2-D diagnostics enables the measurement with high time (1 MHz) and spatial resolutions (80 μm). A 3-D pellet trajectory can be described by a combination of 2-D images and information of initial pellet direction and velocity. A deflection of the pellet trajectory in the neutral beam injection (NBI) heated plasmas of LHD has been observed. Means of improving the measurement accuracy of this system are also discussed.
Keywords
fueling, solid hydrogen, ablation, pellet trajectory, position sensitive detector, rocket effect, Large Helical Device
Full Text
References
- [1] S.L. Milora, W.A. Houlberg et al., Nucl. Fusion 35, 657 (1995).
- [2] L.R. Baylor et al., Phys. Plasmas 12, 056103 (2005).
- [3] P.T. Lang et al., Phys. Rev. Lett. 79, 1487 (1997).
- [4] L.R. Baylor et al., Phys. Plasmas 7, 1878 (2000).
- [5] S.L. Milora and C.A. Foster, IEEE Trans. Plasma Sci. PS-6, 578 (1978).
- [6] P.B. Parks and R.J. Turnbull, Phys. Fluids 21, 1735 (1978).
- [7] L.R. Baylor et al., Nucl. Fusion 37, 445 (1997).
- [8] M. Hoshino et al., Plasma Fusion Res. 1, 033 (2006).
- [9] R. Sakamoto et al., Nucl. Fusion 44, 624 (2004).
- [10] P. Innocente et al., Rev. Sci. Instrum. 70, 943 (1999).
- [11] H. Yamada et al., Fusion Eng. Des. 49-50, 915 (2000).
- [12] M. Hoshino et al., Fusion Eng. Des. 81, 2655 (2006).
This paper may be cited as follows:
Mitsuyasu HOSHINO, Ryuichi SAKAMOTO, Hiroshi YAMADA, Yasuhiko ITOH, Kohki KUMAGAI, Ryuhei KUMAZAWA, Tetsuo WATARI and the LHD Experimental Group, Plasma Fusion Res. 3, 002 (2008).