Results 81 to 90 of about 1,068 (190)

Strong electron temperature stiffness induced by broad-band turbulence in high poloidal beta plasmas on EAST

Nuclear Fusion
We report observations of strong electron temperature profile stiffness in high poloidal beta ( ${\beta _{\text{p}}}\sim 2$ ) plasmas on EAST for the first time.
F. Chen, Y.C. Hu, Y.D. Li, X.J. Wang, P. Li, J.S. Geng, N. Sun, P.J. Sun, T. Zhang, E.Z. Li, T.F. Zhou, H.L. Zhao, Q. Zang, Y.Q. Chu, S.X. Wang, H.Q. Liu, Y.F. Jin, B. Lyu, G.X. Wang, L. Ye, X.Z. Gong, J.G. Li   +21 more
doaj   +1 more source

Measurements of Intrinsic Ion Bernstein Waves in a Tokamak by Collective Thomson Scattering [PDF]

, 2011
In this Letter we report measurements of collective Thomson scattering (CTS) spectra with clear signatures of ion Bernstein waves and ion cyclotron motion in tokamak plasmas.
Stejner Pedersen, Morten, Korsholm, SB, S. K. Nielsen, de M. Baar, Furtula, Vedran, de Baar, M., E. Delabie, Salewski, Mirko, Moseev, D., Brezinsek, S., Nielsen, Stefan Kragh, Furtula, V, Nielsen, SK, Bindslev, H., D. Moseev, Meo, F., F. Leipold, Meo, F, Salewski, M, Stejner, M., S. B. Korsholm, V. Furtula, Michelsen, P. K., Leipold, F, Moseev, D, Leipold, Frank, de Baar, M.R., Furtula, V., Delabie, EG Ephrem, Stejner, M, F. Meo, Michelsen, PK, M. Stejner, Delabie, E., M. Salewski, Michelsen, Poul, Bindslev, H, Meo, Fernando, Korsholm, S.B., M. de Baar, M. Kantor, Nielsen, S. K., Salewski, M., Kantor, M, de Baar, Marco, H. Bindslev, Moseev, Dmitry, TEXTOR, Team., A. Bürger, Kantor, M., Delabie, E.G., Bindslev, Henrik, M.R. de Baar, P. K. Michelsen, Leipold, F., Michelsen, P.K., Bürger, A, Baar, MR Marco de, Nielsen, S.K., Bürger, A., Korsholm, S. B., Slaewski, M., Korsholm, Søren Bang   +62 more
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Collective Thomson scattering energetic particle diagnostic in high performance tokamaks. Final report

, 1997
This report summarizes the work performed under DOE grant DE-FG03-95ER54334. Lodestar was an active participant in the low power Collective Thomson Scattering (CTS) diagnostic experiment at TFTR in collaboration with MIT.
Aamodt, R. E., Russell, D. A., Cheung, P. Y.   +2 more
core   +1 more source

Physically constrained data-driven inversion of 2D fast-ion velocity distributions from single view CTS spectra

Nuclear Fusion
Reconstructing fast-ion velocity distributions from collective Thomson scattering (CTS) spectra is an ill-posed inverse problem due to the spectral nonlinearity, strong parameter coupling and measurement noise.
Q.H. Jiang, X.X. Chen, D.H. Xia, M. Huang, Y.H. Ding   +4 more
doaj   +1 more source

Diagnostic weight functions in constants-of-motion phase-space

Nuclear Fusion
The fast-ion phase-space distribution function in axisymmetric tokamak plasmas is completely described by the three constants of motion: energy, magnetic moment and toroidal canonical angular momentum. In this work, the observable regions of constants-of-
M. Rud, D. Moseev, F. Jaulmes, K. Bogar, J. Eriksson, H. Järleblad, M. Nocente, G. Prechel, B.C.G. Reman, B.S. Schmidt, A. Snicker, L. Stagner, A. Valentini, M. Salewski   +13 more
doaj   +1 more source

Fast-ion phase-space tomography with wave–particle interactions in the ion cyclotron frequency range as prior

Nuclear Fusion
The fast-ion distribution function in fusion plasmas can be inferred by inverting Doppler-shifted measurements from fast-ion diagnostics. The full fast-ion distribution function can be parametrised by three constants of motion with the addition of a ...
M. Rud, L.G. Eriksson, J. Eriksson, P.C. Hansen, O. Hyvärinen, H. Järleblad, Ye.O. Kazakov, S.B. Korsholm, M. Nocente, J. Rasmussen, B.C.G. Reman, A. Snicker, A. Valentini, Y. Dong, D. Moseev, M. Salewski   +15 more
doaj   +1 more source

Collective Thomson scattering diagnostic utilizing a quasi-optical frequency tunable gyrotron as a radiation source for LHD plasma experiment [PDF]

, 2003
Collective Thomson scattering technique based on high power has already proved its ability in measuring the ion (bulk and fast) temperature (Ti) in fusion plasma devices like tokamaks and stellarators.
R.PAVLICHENKO, IDEHARA, T, SATO, M, OGAWA, I, KAWAHATA, K   +4 more
core   +1 more source

High-k turbulence characteristics in density modulation experiments of EAST

AIP Advances
High-k turbulence (1 < kθρs < 5) spectrograms have been directly measured in density modulation experiments of the EAST tokamak using the collective Thomson scattering diagnostic system.
F. Chen, P. Li, Y. D. Li, X. J. Wang, G. J. Wu, J. S. Geng, Y. H. Wang, N. Sun, P. J. Sun, M. Wang, B. J. Ding, C. B. Wu, E. Z. Li, T. F. Zhou, H. L. Zhao, Q. Zang, S. X. Wang, H. Q. Liu, Y. F. Jin, B. Lyu, J. G. Li   +20 more
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TFTR 60 GHz alpha particle collective Thomson Scattering diagnostic [PDF]

, 1995
A 60 GHz gyrotron collective Thomson Scattering alpha particle diagnostic has been implemented for the D-T period on TFM. Gyrotron power of 0.1-1 kW in pulses of up to 1 second can be launched in X-mode.
Park, H. K., Russell, D. A., David A. Russell, Woskov, P. P., Bretz, N. L., Henrik Bindslev, Aamodt, R. E., Hyeon K. Park, Norton L. Bretz, Paul P. Woskov, Peter Y. Cheung, Bindslev, H., James Gilmore, Richard E. Aamodt, Gilmore, J., Machuzak, J. S., Cheung, P. Y., John S. Machuzak   +17 more
core   +1 more source

Collective Thomson Scattering Study using Gyrotron in LHD

, 2008
The collective Thomson scattering (CTS) is one of the most promising methods for evaluating the ion velocity distribution function. The study of CTS diagnostic has been started utilizing the gyrotron and antenna/transmission systems installed in LHD for ...
Maski Nishiura, Namiko Tamura, Teruo Saito, Hiromi Takahashi, Hiroe Igami, Takashi Shimozuma, Yasuo Yoshimura, Shin Kubo, Yoshinori Tatematsu, Takashi Notake, Kenji Tanaka   +10 more
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