Parametric lower-hybrid instability drives by modulated electron beam injection

by Princeton University. Plasma Physics Laboratory

Publisher: Dept. of Energy, Plasma Physics Laboratory, Publisher: for sale by the National Technical Information Service] in Princeton, N.J, [Springfield, Va

Written in English
Published: Pages: 13 Downloads: 731
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Subjects:

  • Electron beams,
  • Plasma instabilities,
  • Plasma confinement

Edition Notes

StatementG. R. Allen ... [et al.], Plasma Physics Laboratory, Princeton University ..
SeriesPPPL ; 1460
ContributionsAllen, G. R, United States. Dept. of Energy
The Physical Object
Pagination13 p. :
Number of Pages13
ID Numbers
Open LibraryOL14882452M

The 26th IAEA Fusion Energy Conference is being organized by the IAEA in cooperation with the National Institute for Fusion Science, Japan. Previous conferences in this series were held in Salzburg (), Culham (), Novosibirsk (), Madison (), Tokyo (), Berchtesgaden (), Innsbruck (), Brussels (), Baltimore (), London (), . Long-duration ELM-free QH-mode discharges have been produced with co-current NBI by using n=3 coils to generate sufficient counter-I_P torque. With electron cyclotron heating, ITER baseline discharges at beta_N=2 and scaled neutral beam injection torque have been maintained in stationary conditions for more than 4 resistive times. He, J.; Marsch, E. Bibcode: AGUFMSH33AW Altcode: According to several theories, the beam instability induced by shock-accelerated ions can generate upstream-propagating Alfvén waves (UPAWs) with a bump near Hz in the power spectrum, while the nonlinear wave-wave interaction favors an inverse cascade to create a power-law spectrum. Cheung, David and Troisi, Alessandro Theoretical study of the organic photovoltaic electron acceptor PCBM: morphology, electronic structure, and charge localization. Journal of Physical Chemistry C, (48). – ISSN

These waves, having frequencies extending from the electron cyclotron frequency fce, up to the electron plasma frequency fpe, could contribute 10% to the in situ measurement of intermittent energy conversion at the DF layer. Their generation may be attributed to electron beams, which are simultaneously observed at the DF as well. Book of abstract FisMat docx Italian National Conference on Condensed Matter Physics (Including Optics, Photonics, Liquids, Soft Matter) Palermo, September 28 - October 2, BOOK OF ABSTRACT Editors Flavio Seno University of Padova Davide Valenti University of Palermo ISBN Dipartimento di Fisica e Chimica 2 Dear colleagues, it’s a . Compare the force () to the Lorentz force where for a thermal electron in the corona and Calculate (plasma beta) at the site of a flare before the energy is released, assuming thermal equilibrium and pressure equilibrium, an electron density of a magnetic field of G, and a temperature of Let us first assume for simplicity that 5/5(6).   Electron beam machining using rotating and shaped beam power distribution. DOEpatents. Elmer, J.W.; O`Brien, D.W. An apparatus and method are disclosed for electron beam (EB) machining (drilling, cutting and welding) that uses conventional EB guns, power supplies, and welding machine technology without the need for fast bias pulsing .

10 Non-linear plasma physics Introduction Non-linear Landau theory Quasi-linear theory Particle trapping Particle trapping in the beam–plasma instability Plasma echoes Wave–wave interactions Parametric instabilities Zakharov equations Modulational instability Collisionless.   Ion Bernstein wave heating research. NASA Astrophysics Data System (ADS) Ono, Masayuki. Ion Bernstein wave heating . Plasma Abstract Book by Dr A B Rajib Hazarika,PhD,FRAS,AES - Free ebook download as PDF File .pdf), Text File .txt) or read book online for free. Abstract book of PLASMA,32nd National symposium on Plasma Science and technology,IPR,Gandhinagar,Gujrat. For an infinite homogeneous plasma, the linearized Vlasov equation can be written compactly as Df 1 =Dt ¼ a1. qf o =qv; where Df 1 =Dt is the convective derivative of the perturbed electron distribution and is to be integrated along the unperturbed electron orbits, and a1 is the electron acceleration due to the fields of the wave: a1 ¼ ðe.

Parametric lower-hybrid instability drives by modulated electron beam injection by Princeton University. Plasma Physics Laboratory Download PDF EPUB FB2

Get this from a library. Parametric lower-hybrid instability drives by modulated electron beam injection. [G R Allen; Princeton University. Plasma Physics Laboratory.; United States. Department of Energy.].

Volume 51 A, number 2 PHYSICS LETTERS 10 February LOWER-HYBRID PARAMETRIC INSTABILITY AND ION HEATING IN A MODULATED ELECTRON BEAM-PLASMA SYSTEM K. YATSUI Department of Electrical Engineering, Osaka University, Toyonaka, OsakaJapan Received 3 November The interaction of an electron beam modulated near the lower Cited by: 2.

Parametric excitation of the drift wave is observed by an ion beam modulated near the lower-hybrid frequency. An rf field parallel to the magnetic field is found to play an important role in the excitation of the instability. Substantial increase of the ion and electron temperatures is : Mitsuyasu Yatsuzuka, Kikoh Satoh, Sadao Nobuhara, Kiyoshi Yatsui, Masahiro Yokoyama.

Abstract. Three wave parametric instability of a large amplitude lower hybrid wave in two-ion species plasma is studied analytically.

The pump decays into a low frequency mode or quasi mode in the ion cyclotron range of frequency and a lower hybrid wave : Nafis A, Moiz A. Parameter Study of Parametric Instabilities during Lower Hybrid Waves Injection into Tokamaks Aihui Zhao1, Zhe Gao1 1 Department of Engineering Physics, Tsinghua University, BeijingCHINA E-mail contact of main author: [email protected] Abstract.

A parameter study of the parametric instability (PI) during the lower hybrid wave (LHW. A parameter study of the parametric instability (PI) during lower hybrid wave injection into tokamak plasmas is performed based on its local dispersion relation.

Parametric instability of a lower hybrid wave in a dusty plasma 1 K Sharma & 1 Parashar Department of Applied Physics, Samra. with the pump lower hybrid wave, mode. The variations in the charge of the dust due to electron and ion attachment introduce linear damping in the high frequency modes.

At high powers, when the growth rate Cited by: 5. The neutral beam (NB), the ion cyclotron (IC), lower hybrid (LH) and electron cyclotron (EC) heating systems provide heating as well as current drive. Three wave parametric instability of a large amplitude lower hybrid wave in two-ion species plasma is studied analytically.

The pump decays into a low frequency mode or quasi mode in the ion cyclotron range of frequency and a lower hybrid wave sideband. The dominant channel ofAuthor: Nafis A, Moiz A. Influence of collisions on parametric instabilities induced by lower hybrid waves in tokamak plasmas C. Castaldo1, A.

Di Parametric lower-hybrid instability drives by modulated electron beam injection book 2, lower hybrid waves, lower hybrid current drive, parametric instabilities (Some figures may appear in colour only in the online journal) rf power injection becomes much lower than expected by the.

The region of bouncing electron beams in the earth’s magnetosphere can be unstable against a non-resonant electromagnetic lower hybrid instability. The instability is purely growing in the rest frame of the plasma, and can be excited either by the temperature anisotropy or the drift velocity of the bouncing electron beams.

The growth rates of the instability Author: B A Rao, G S Lakhina. the lower hybrid resonance frequency, but below the electron cyclotron frequency i.e.: w w w. LH ce (1) where. is given by: 2 2 2 2. 1 w w w w pi LH pe ce (2) w. is an electron cyclotron frequency, w. and.

are electron and ion plasma frequencies correspondently. Linear excitation of VLF waves by a loop antenna was File Size: 1MB. A rule of thumb that predicts the PDI limit toward ω0/ωlh →2 [Porkolab, Phys. Fluids, 20, ()] is not in agreement with C-Mod experimental results.

• Raising the magnetic field from Bt0 = T to T lowers ω0/ωlh toward PDI limit. • The ω0/ωlh scaling law assumes that the edge density is only a function of core density. Threshold of parametric decay instability accompanying electron Bernstein wave heating in spherical tokamaks E Z Gusakov and A V Surkov Ioffe Institute, Politekhnichesk St.

Petersburg, Russia E-mail: @ Abstract. The parametric instability of upper hybrid wave decay into back scatteredFile Size: KB. TilG parametric decay of an upper hybrid (UH) wave into a lower hybrid (LH) wave and a downshifted UH wave inside inhomogeneous ionospheric striations, when both pump and decay UH modes are trapped, is investigated.

The threshold and. The theory of parametric excitations in a magnetized plasma by the action of a driver pump with time‐varying amplitude and phase is developed.

As a concrete example, amplitude modulation in the form of rectangular pulse train and phase modulation in a sinusoidal form are assumed.

Both nonresonant interaction, when the driven‐pump carrier frequency is larger than all high Cited by: 2. Observations indicated that electron beams generated near the Sun were causing radiation in the plasma frequency and its harmonic while propagating over distances of 1 AU.

Conventional quasi-linear beam-plasma instability theory predicted that will form a. Keywords: lower hybrid, current drive, parametric decay instability PACS: INTRODUCTION The main motivation of lower hybrid current drive (LHCD) experiments on Alcator C-Mod [1] is to actively control the current density profile to develop ITER relevant steady state regimes.

Lower hybrid (LH) waves can transfer. 4/10 2 PDI can redistribute pump power to decay waves, resulting in lower current drive efficiency. E.g., decay of pump LH wave into two decay waves1 Pump (0): LH wave Decay wave (1): LH wave with higher n Another decay wave: ion sound quasi-mode2,3 - ion cyclotron quasi-mode1,4 𝜔0≈𝜔+𝜔1 Loss of current drive efficiency due to PDI.

Resonant decay instabilities of a pump wave with frequency ω 0 near the lower‐hybrid frequency ϑ lh are analyzed with respect to the wavenumber k of the decay waves and the ratio ω 0 /ω lh to determine the decay process with the minimum threshold.

It was found that the lowest thresholds are for decay into an electron plasma (lower‐hybrid) wave plus Cited by: Vol,No.7() Nonlinear Evolution of Lower-Hybrid Drift Instability in Harris Current Sheet ⁄ GUO Fan(郭帆)1;2, LU Quan-Ming(陆全明)1;2⁄⁄, GUO Jun(郭俊)3, WANG Shui(王水)1 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei 2Key Laboratory of Space Weather, Center for Space Science and.

Parametric excitation of ion-ion hybrid mode by a large amplitude lower hybrid wave in a two ion species D-T plasma is investigated. The sideband lower hybrid wave, generated in the nonlinear coupling process, beats with the pump to exert a parallel ponderomotive force on electrons driving the low frequency mode.

The density perturbation associated with the latter Author: Nafis Ahmad. In present-day tokamaks, a large fraction of the plasma heating is often applied via neutral-beam injection (NBI).

Since the neutral beams are directed, they impart not only energy but also angular momentum to the plasma. This beam torque tends to drive strong toroidal rotation in the direction of the beam, as seen in the Nm profile in. Unfortunately, this book can't be printed from the OpenBook.

If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF. This book provides a concise introduction to the basic physics of radiofrequency heating. Most existing literature on the subject is at the research level, aimed at specialists in the field.

It provides a survey of theoretical and experimental results with a large number of references to help the reader wishing for more detail. A linear dispersion relation is derived. The effect of the electron beam on the pulse after the occurrence of axial bunching is examined.

Injection of axially modulated electron beams is also explored. In particular, we find that a properly phased electron beam can transfer energy to the laser pulse as an inverse process to acceleration. Full text of "DTIC ADA Naval Research Laboratory Review." See other formats. Publications Resulting from the Use of NERSC Resources On their Allocation Year ERCAP Request Forms Principal Investigators reported 2, refereed publications (published or in press) for the preceding 12 months, based on using, at least in part, NERSC resources.

Yi-Min Huang and A. Bhattacharjee, âTurbulent Magnetohydrodynamic Reconnection Mediated by the Plasmoid Instability,â Astrophys. 20 (). Ebrahimi and R. Raman, âLarge-volume flux closure during plasmoid-mediated reconnection in coaxial helicity injection,â Nuclear Fusion Lett.

56, (). If a total disconnection of the electron transport through the double layer is considered because fo the return current of the electrons, only the ions can transport the heat. The thermal conductivity K is then that of the ions, K_given by that of the electrons Ke, K = _:i = _e(m/mi) ½, (13) where m is the electron mass and m i is the ion mass.

How electron two-stream instability drives cyclic Langmuir collapse and continuous coherent emission. Proceedings of the National Academy of Sciences of the United States of America(7), Gabe Podcast Sakthi Monk Media Gentleman and Lady's Book of Politeness and Propriety of Deportment, The by CELNART, Élisabeth Olivier I LOVE PACA Podcast Mr.J Featured software All software latest This Just In Old School Emulation MS-DOS Games Historical Software Classic PC Games Software Library.In both cases, an ambipolar electric field traps ionospheric electrons.

For downward currents, an energetic ionospheric electron beam emerges into the magnetosphere where it is accelerated around the B/n peak at altitudes of - km to carry the current.

The electric field maximises just Earthward of the B/n peak.