Results 31 to 40 of about 2,222,331 (211)

Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy

Nuclear Materials and Energy, 2021
A spectroscopic system with multiple viewing chords was developed for QUEST (Q-shu University Experiment with Steady-State Spherical Tokamak) to measure the spatial distribution of ion toroidal velocities in discharges sustained by electron cyclotron ...
N. Yoneda, T. Shikama, K. Hanada, S. Mori, T. Onchi, K. Kuroda, M. Hasuo, A. Ejiri, K. Matsuzaki, Y. Osawa, Y. Peng, Y. Kawamata, S. Sakamoto, H. Idei, T. Ido, K. Nakamura, Y. Nagashima, R. Ikezoe, M. Hasegawa, A. Higashijima, T. Nagata, S. Shimabukuro   +21 more
doaj   +1 more source

Parametric Decay Instabilities during Electron Cyclotron Resonance Heating of Fusion Plasmas, Problems and Possibilities [PDF]

EPJ Web of Conferences, 2023
We review parametric decay instabilities (PDIs) expected in connection with electron cyclotron resonance heating (ECRH) of magnetically confined fusion plasmas, with a specific focus on conditions relevant for the ITER tokamak.
Hansen S.K., Nielsen S.K., Stober J., Rasmussen J., Salewski M., Willensdorfer M., Hoelzl M., Stejner M.   +7 more
doaj   +1 more source

Identification of slow-wave ion cyclotron emission on JT-60U

Identification of slow-wave ion cyclotron emission on JT-60U
Ion cyclotron emissions (ICEs) are generally considered to be emissions of fast waves driven by velocity-space instabilities due to fast ions. However, on JT-60U, measured properties of ICEs observed at frequencies lower than the bulk ion cyclotron frequency (L-ICEs) do not match the fast-wave dispersion relation, indicating the possibility of L-ICEs ...
Koji, Shinohara, Ichimura, Makoto, 1017641, 1017642, 1017650, Bando, Takahiro, 1017649, 1017647, Shuhei, Sumida, 1017648, 1017645, 1017646, 1017643, 1017644, Shunsuke, Ide, Bierwage, Andreas   +15 more
openaire   +2 more sources

Two Dimensional Full‐Wave Modeling of Propagation of Low‐Altitude Hiss in the Ionosphere

Geophysical Research Letters, 2020
We investigate the propagation characteristics of low‐altitude hiss in the ionosphere by numerical simulation with a two‐dimensional full‐wave model. The simulation results demonstrate that linear mode conversion from whistler to H+ band electromagnetic ...
Xiang Xu, Chen Zhou, Lunjin Chen, Zhiyang Xia, Xu Liu, Jamesina J. Simpson, Yuannong Zhang   +6 more
doaj   +1 more source

Resonance in radio frequency sheath admittance and enhanced impurity emission near the ion cyclotron frequency

Nuclear Fusion, 2023
Ion cyclotron resonance heating (ICRH) is of considerable interest among all auxiliary heating techniques, because it transfers power directly to ions, targets the high-density core, and involves the cheapest radio-frequency (RF) components.
Mikhail Rezazadeh, James R. Myra, Davide Curreli   +2 more
doaj   +1 more source

Range finding of Alfvén oscillations and direction finding of ion-cyclotron waves by using the ground-based ULF finder [PDF]

, 1996
International audienceA new approach to the problem of direction and distance finding of magnetospheric ULF oscillations is described. It is based on additional information about the structure of geoelectromagnetic field at the Earth's surface which is ...
Orr, D., O. Pokhotelov, Pokhotelov, O., D. Milling, Guglielmi, A., J. Kangas, D. Orr, Kangas, J., Milling, D., A. Guglielmi   +9 more
core   +2 more sources

Energetic particle-driven compressional Alfvén eigenmodes and prospects for ion cyclotron emission studies in fusion plasmas

New Journal of Physics, 2016
As a fundamental plasma oscillation the compressional Alfvén waves (CAWs) are interesting for plasma scientists both academically and in applications for fusion plasmas. They are believed to be responsible for the ion cyclotron emission (ICE) observed in
N N Gorelenkov
doaj   +1 more source

Detection of edge ion cyclotron emission driven by energetic deuterium ions in the EAST [PDF]

AIP Conference Proceedings, 2020
Ion cyclotron emission (ICE) detection system has been successfully designed and used on the Experimental Advanced Superconducting Tokamak (EAST). Experiments were performed in deuterium target plasmas, with the neutral heating beam consisting of 100% deuterium atoms accelerated up to 55-70 keV.
L. Liu, X. Zhang, Y. Zhu, C. Qin, Y. Zhao, S. Yuan, Y. Mao, M. Li, J. Chen, H. Li, L. Ai   +10 more
openaire   +1 more source

Velocity-space sensitivity and inversions of synthetic ion cyclotron emission [PDF]

Physics of Plasmas, 2023
This paper introduces a new model to find the velocity-space location of energetic ions generating ion cyclotron emission (ICE) in plasmas. ICE is thought to be generated due to inverted gradients in the v⊥ direction of the velocity distribution function or due to anisotropies, i.e., strong gradients in the pitch direction.
B. S. Schmidt, M. Salewski, B. C. G. Reman, R. O. Dendy, Y. Dong, H. Järleblad, D. Moseev, R. Ochoukov, M. Rud, A. Valentini   +9 more
openaire   +2 more sources

Periodic Beam Current Oscillations Driven by Electron Cyclotron Instabilities in ECRIS Plasmas [PDF]

, 2015
Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cwmode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the ...
Koivisto, Hannu, Toivanen, V., Izotov, I., Kronholm, Risto, Tarvainen, Olli, Laulainen, Janne, Skalyga, V., Kalvas, Taneli, Komppula, Jani, Mansfeld, D.   +9 more
core   +1 more source