Plasma and Fusion Research
Volume 2, 047 (2007)
Letters
- National Institute for Fusion Science
Abstract
A high density internal diffusion barrier has been produced in the intrinsic helical divertor configuration in LHD by optimizing the pellet fueling scenario and magnetic configuration. The internal diffusion barrier easily appears in the outer shifted magnetic configuration in which magneto-hydrodynamic stability properties are considered to be favorable. The attainable central plasma density becomes higher as the magnetic axis shifts outward and the central density exceed 5 × 1020 m-3. Central pressure exceeds 130 kPa and, therefore, very large Shafranov shift is observed, even at high magnetic field (Bt > 2.54 T).
Keywords
stellarator, internal diffusion barrier, pellet fueling, divertor, magnetic configuration
Full Text
References
- [1] N. Ohyabu et al., Phys. Rev. Lett. 97, 055002 (2006).
- [2] JET Team, Plasma Phys. Control. Fusion 30, 1467 (1988).
- [3] Y. Takase et al., Phys. Plasmas 4, 1647 (1997).
- [4] L.R. Baylor et al., Phys. Plasmas 7, 1878 (2000).
- [5] O. Motojima et al., Phys. Plasmas 6, 1843 (1999).
- [6] R. Sakamoto et al., Nucl. Fusion 41, 381 (2001).
- [7] H. Yamada et al., Plasma Phys. Controll. Fusion 43, A55 (2001).
- [8] S. Masuzaki et al., Nucl. Fusion 42, 750 (2001).
This paper may be cited as follows:
Ryuichi SAKAMOTO, Hiroshi YAMADA, Nobuyoshi OHYABU, Masahiro KOBAYASHI, Junichi MIYAZAWA, Satoshi OHDACHI, Tomohiro MORISAKI, Suguru MASUZAKI, Ichihiro YAMADA, Kazumichi NARIHARA, Motoshi GOTO, Shigeru MORITA, Satoru SAKAKIBARA, Kenji TANAKA, Kazuo KAWAHATA, Akio KOMORI, Osamu MOTOJIMA and LHD experimental group, Plasma Fusion Res. 2, 047 (2007).