| Autor: |
Ryan, P.M., Swain, D.W., Wilson, J.R., Hosea, J.C., LeBlanc, B.P., Bernabei, S., Bonoli, P., Carter, M.D., Jaeger, E.F., Kaye, S., Mau, T.K., Phillips, C.K., Rasmussen, D.A., Wilgen, J.B. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2003, Vol. 694 Issue 1, p209-212, 4p |
| Abstrakt: |
Phased-array experiments were performed with the 30-MHz, 12-element HHFW antenna array on NSTX for rf powers in the 2–4.5 MW range. Relative phase shift of the array was scanned from π/6 to π/2 to create kz spectral peaks between 3 and 7.6 m-1; it was also possible to switch from π/2 to π/4 phasing during a shot. Typical plasma parameters were Ip ∼ 0.5 MA, BT ∼ 0.45 T, and ne(0) ∼ 1-3×1019 m-3, and Te(0) ∼ 1-3 keV. Electron heating was observed even at the highest wave phase velocities, reaching 1.3 keV with 2.2 MW at -π/6 phasing and 2.7 keV with 2.9 MW at -π/3. Lower plasma loading and higher central heating efficiency are observed for counter-CD phasing. MSE measurement of the current profile is not yet available; therefore, the rf-driven portion of the plasma current is calculated from the difference in loop voltage between co- and counter-CD phasing. The normalized current drive efficiency for kz = 7.6 m-1 is γ∼ 0.035×1019 A•W-1•m-2 for both D and He plasmas. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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