Results 41 to 50 of about 2,222,331 (211)

Survey of the TS-ECE Discrepancy and recent investigations in ICRF heated plasmas at Alcator C-Mod

EPJ Web of Conferences, 2012
This paper reports on a new investigation of the long-standing, unresolved discrepancy between Thomson Scattering (TS) and Electron Cyclotron Emission (ECE) measurements of electron temperature in high temperature tokamak plasmas.
Reinke M. L., Ma Y., Lin Y., Harvey R. W., Bader A., Austin M. E., Bonoli P. T., Hughes J. W., Hubbard A. E., White A. E., Wolfe S. M., Wukitch S. J.   +11 more
doaj   +1 more source

Interpretation of core ion cyclotron emission driven by sub-Alfvénic beam-injected ions via magnetoacoustic cyclotron instability [PDF]

Nuclear Fusion, 2019
Core ion cyclotron emission (ICE) signals have recently been observed in beam-heated plasmas on several tokamaks. In this manuscript we present experimental evidence in support of core ICE being generated by the magnetoacoustic cyclotron instability (MCI), itself driven by the velocity-space inversion of sub-Alfvenic beam-injected ions.
R. Ochoukov, K.G. McClements, R. Bilato, V. Bobkov, B. Chapman, S.C. Chapman, R.O. Dendy, M. Dreval, H. Faugel, J.-M. Noterdaeme, M. Salewski, M. Weiland   +11 more
openaire   +2 more sources

Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror

Nuclear Materials and Energy, 2019
The transition of a detached to attached plasma experiment has been performed in GAMMA 10/PDX by applying an additional plasma heating pulse of electron cyclotron heating (ECH).
Y. Nakashima, M.S. Islam, T. Iijima, M. Sakamoto, N. Ezumi, M. Yoshikawa, N. Asakura, M. Fukumoto, A. Hatayama, M. Hirata, M. Ichimura, R. Ikezoe, T. Imai, M.M. Islam, T. Kariya, J. Kohagura, S. Masuzaki, R. Minami, T. Nakano, K. Nojiri, T. Numakura, K. Sawada, M. Shoji, A. Terakado, S. Togo, S. Yamashita, T. Yoshimoto   +26 more
doaj   +1 more source

Ion Cyclotron Emission Studies: Retrospects and Prospects

Физика плазмы, 2016
Ion cyclotron emission (ICE) studies emerged in part from the papers by A.B. Mikhailovskii published in the 1970s. Among the discussed subjects were electromagnetic compressional Alfvenic cyclotron instabilities with the linear growth rate ~ $\sqrt {n_\alpha /n_e } $
openaire   +2 more sources

Ion cyclotron emission in Maxwellian plasmas

Physics of Plasmas
Destabilization of ion cyclotron waves—waves with frequencies close to ion cyclotron harmonics—in inhomogeneous plasmas with Maxwell velocity distribution is considered. A new mechanism of destabilization of these waves is found, whereas the known interaction between cyclotron waves and drift waves is shown to be hardly able to lead to instabilities in
Ya. I. Kolesnichenko, V. V. Lutsenko, A. V. Tykhyy   +2 more
openaire   +1 more source

Quantifying Fusion Born Ion Populations in Magnetically Confined Plasmas using Ion Cyclotron Emission [PDF]

Physical Review Letters, 2017
Ion cyclotron emission (ICE) offers unique promise as a diagnostic of the fusion born alpha-particle population in magnetically confined plasmas. Pioneering observations from JET and TFTR found that ICE intensity $P_{ICE}$ scales approximately linearly with the measured neutron flux from fusion reactions, and with the inferred concentration, $n_α/n_i$,
Carbajal, L., Dendy, R. O., Chapman, S. C., Cook, J. W. S.   +3 more
openaire   +4 more sources

Probing the relationship between electromagnetic ion cyclotron waves and plasmaspheric plumes near geosynchronous orbit [PDF]

, 2010
Plasmaspheric plumes created during disturbed geomagnetic conditions have been suggested as a major cause of increased occurrences of electromagnetic ion cyclotron (EMIC) waves at these times.
R. B. Horne, M. J. Engebretson, M. R. Lessard, Denton, M.H., Horne, R.B., Posch, J.L., Murphy, M.T., Engebretson, M.J., M. T. Murphy, J. L. Posch, Lessard, M.R., M. H. Denton   +11 more
core   +1 more source

Degradation Mechanism of Phosphate‐Based Li‐NASICON Conductors in Alkaline Environment

Advanced Energy Materials, Volume 15, Issue 11, March 18, 2025.
The presence of water in the cathode of a Li‐air battery shifts reactions to produce LiOH, creating a corrosive, alkaline environment. This study investigates the alkaline stability of the common Li‐NASICON solid‐state conductor chemistries through a systematic experimental study combined with computational modeling to understand the degradation ...
Benjamin X. Lam, Zhuohan Li, Tara P. Mishra, Gerbrand Ceder   +3 more
wiley   +1 more source

Predicting Performance of Hall Effect Ion Source Using Machine Learning

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
This study introduces HallNN, a machine learning tool for predicting Hall effect ion source performance using a neural network ensemble trained on data generated from numerical simulations. HallNN provides faster and more accurate predictions than numerical methods and traditional scaling laws, making it valuable for designing and optimizing Hall ...
Jaehong Park, Guentae Doh, Dongho Lee, Youngho Kim, Changmin Shin, Su‐Jin Shin, Young‐Chul Ghim, Sanghoo Park, Wonho Choe   +8 more
wiley   +1 more source

Dependence of ion-cyclotron range of frequencies instabilities on species mix and fast-ion distribution: II. Time evolution

Nuclear Fusion
Dedicated DIII-D experiments studied instabilities below the ion cyclotron frequency f _ci and at cyclotron harmonics by injecting thirteen different neutral beam populations into plasmas with different thermal compositions of H and D at five different ...
W.W. Heidbrink, G.H. DeGrandchamp, J.B. Lestz, K.E. Thome, S. Vincena, N.A. Crocker, X.D. Du, R.I. Pinsker, G.A. Riggs, S.X. Tang, M.A. Van Zeeland   +10 more
doaj   +1 more source