M. Yoshida et al 2009 Nucl. Fusion 49 115028 doi:10.1088/0029-5515/49/11/115028
Characteristics of momentum transport in JT-60U H-mode plasmas
M. Yoshida, Y. Kamada, H. Takenaga, Y. Sakamoto, N. Oyama, H. Urano and the JT-60 Team
Show affiliationsProperties of the toroidal momentum diffusivity (χ
) and the convection velocity (Vconv) in JT-60U H-mode plasmas have been obtained by plasma parameter scans such as the plasma current, neutral beam heating power and electron density. The toroidal momentum diffusivity increases with increasing heat diffusivity (χi) over a wide range of radii (r/a = 0.2–0.6) and χ/χi ~ 0.7–3 at the half radius (r/a = 0.5). The inward convection velocity (−Vconv) increases with increasing χ, and −Vconv/χ ~ 0.5–2 (m−1) at r/a = 0.5. It is found that the ratio χ/χi increases with increasing ion temperature and decreases with increasing electron density. These tendencies are observed in other radial positions of r/a = 0.3, 0.4 and 0.6. Moreover, the ratio −Vconv/χ at r/a = 0.4, 0.5 and 0.6 increases with increasing ion and electron temperatures or temperature gradients.
- PACS
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52.55.Fa Tokamaks, spherical tokamaks
- Subjects
- Dates
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Issue 11 (November 2009)
Received 28 May 2009, accepted for publication 5 October 2009
Published 21 October 2009
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Characteristics of momentum transport in JT-60U H-mode plasmas
M. Yoshida et al 2009 Nucl. Fusion 49 115028
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