Abstract
Observations of an increase in electron density triggered by electrode biasing are reported in the Tohoku University Heliac (TU-Heliac). The biased electrode, which is located deep inside the plasma, induces a strong positive radial electric field, after which the line density increases by a factor of 2, the electron density profile steepens and the fluctuation level drops. We estimate the damping force opposing poloidal rotation experimentally and compare it with various versions of the neoclassical theory. The experimental results agree in that the measured damping force has a local maxima at |MP| = 1-2 and tends to be proportional to Mp in the high speed region (|MP| > 3-6), where Mp is the poloidal Mach number. For |Mp| < 1-2, however, the dependence of the measured damping force on Mp differs a little from theoretical predictions.
| Original language | English |
|---|---|
| Pages (from-to) | 3697-3706 |
| Number of pages | 10 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 36 |
| Issue number | 6 A |
| Publication status | Published - Jun 1 1997 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
- Physics and Astronomy(all)
Cite this
Influence of biased electrode on plasma confinement in the Tohoku University Heliac. / Inagaki, Shigeru; Kitajima, Sumio; Takayama, Masakazu; Nakamura, Eiji; Yoshida, Takeo; Watanabe, Hiroshige.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 36, No. 6 A, 01.06.1997, p. 3697-3706.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Influence of biased electrode on plasma confinement in the Tohoku University Heliac
AU - Inagaki, Shigeru
AU - Kitajima, Sumio
AU - Takayama, Masakazu
AU - Nakamura, Eiji
AU - Yoshida, Takeo
AU - Watanabe, Hiroshige
PY - 1997/6/1
Y1 - 1997/6/1
N2 - Observations of an increase in electron density triggered by electrode biasing are reported in the Tohoku University Heliac (TU-Heliac). The biased electrode, which is located deep inside the plasma, induces a strong positive radial electric field, after which the line density increases by a factor of 2, the electron density profile steepens and the fluctuation level drops. We estimate the damping force opposing poloidal rotation experimentally and compare it with various versions of the neoclassical theory. The experimental results agree in that the measured damping force has a local maxima at |MP| = 1-2 and tends to be proportional to Mp in the high speed region (|MP| > 3-6), where Mp is the poloidal Mach number. For |Mp| < 1-2, however, the dependence of the measured damping force on Mp differs a little from theoretical predictions.
AB - Observations of an increase in electron density triggered by electrode biasing are reported in the Tohoku University Heliac (TU-Heliac). The biased electrode, which is located deep inside the plasma, induces a strong positive radial electric field, after which the line density increases by a factor of 2, the electron density profile steepens and the fluctuation level drops. We estimate the damping force opposing poloidal rotation experimentally and compare it with various versions of the neoclassical theory. The experimental results agree in that the measured damping force has a local maxima at |MP| = 1-2 and tends to be proportional to Mp in the high speed region (|MP| > 3-6), where Mp is the poloidal Mach number. For |Mp| < 1-2, however, the dependence of the measured damping force on Mp differs a little from theoretical predictions.
UR - http://www.scopus.com/inward/record.url?scp=0031170209&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031170209&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031170209
VL - 36
SP - 3697
EP - 3706
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 6 A
ER -