Generation of Electromagnetic Bursts in the Plasma Cyclotron Maser

Viktorov, M. E.; Vodopyanov, A. V.; Golubev, S. V.; Izotov, I. V.; Mansfeld, D. A.

doi:10.1007/s11141-013-9412-6

Cited by 13 publications

(15 citation statements)

References 20 publications

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“…) may be expressed as (appendix A4) Accidentally, this value is close to the decay time of the hot electrons after ECRH switch-off, estimated from the hard X-ray signals ( figure 6). Note that hot electron losses, both during and after the ECRH stage, may also be related to development of stimulated electron cyclotron instabilities [38].…”

Section: (B)mentioning

confidence: 99%

Electron cyclotron plasma startup in the GDT experiment

et al. 2016

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The paper reports on a new plasma startup scenario in the Gas Dynamic Trap (GDT) magnetic mirror device. The primary 5 MW neutral beam injection (NBI) plasma heating system fires into a sufficiently dense plasma target ("seed plasma"), which is commonly supplied by an arc plasma generator. In the reported experiments, a different approach to seed plasma generation is explored. One of the channels of the electron cyclotron resonance (ECR) heating system is used to ionize the neutral gas and build up the density of plasma to a level suitable for NBI capture. After a short transition (about 1 ms) the discharge becomes essentially similar to a standard one initiated by the plasma gun. The paper presents the discharge scenario and experimental data on the seed plasma evolution during ECR heating, along with the dependencies on incident microwave power, magnetic configuration and pressure of a neutral gas. The characteristics of consequent high-power NBI discharge are studied and differences to the conventional scenario are discussed. A theoretical model describing the ECR breakdown and the seed plasma accumulation in a large scale mirror trap is developed on the basis of the GDT experiment.

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Section: (B)mentioning

confidence: 99%

Electron cyclotron plasma startup in the GDT experiment

et al. 2016

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“…5): the rapid falling tone is replaced by generation of narrow-banded emission. This regime is concerned with interaction of transverse z-mode with hot electrons located at the trap center and is quite typical for rarefied plasma [13,14] …”

Section: Discussionmentioning

confidence: 99%

“…Jovian decametric radiation [12]). Bursts of energetic electrons and electromagnetic emission related to cyclotron instabilities of extraordinary waves propagating in perpendicular direction to the magnetic field, were studied earlier in a decaying plasma of an ECR discharge confined in a mirror axisymmetric magnetic trap [13,14]. The nonlinear instability growth phase was explained in terms of a cyclotron maser model [15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic regimes of cyclotron instability in the afterglow mode of minimum-Belectron cyclotron resonance ion source plasma

Mansfeld¹,

Izotov²,

Skalyga³

et al. 2016

Plasma Phys. Control. Fusion

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Laulainen, J. (2016). Dynamic regimes of cyclotron instability in the afterglow mode of minimum-B electron cyclotron resonance ion source plasma. Plasma Physics and Controlled Fusion, 58 (4) AbstractThe paper is concerned with the dynamic regimes of cyclotron instabilities in nonequilibrium plasma of a minimum-B electron cyclotron resonance ion source operated in pulsed mode. The instability appears in decaying ion source plasma shortly (1 -10 ms) after switching off the microwave radiation of the klystron, and manifests itself in the form of powerful pulses of electromagnetic emission associated with precipitation of high energy electrons along the magnetic field lines. Recently it was shown that such plasma instability causes perturbations of the extracted ion current, which limit the performance of the ion source and generates strong bursts of bremsstrahlung emission. In this article we present time-resolved diagnostics of electromagnetic emission bursts related to cyclotron instability in the decaying plasma. The temporal resolution is sufficient to study the fine structure of the dynamic spectra of the electromagnetic emission at different operating regimes of the ion source. It was found that at different values of magnetic field and heating power the dynamic spectra demonstrate common features: decreasing frequency from burst to burst and always falling tone during a single burst of instability. The analysis has shown that the instability is driven by the resonant interaction of hot electrons, distributed between the ECR zone and the trap center, with slow extraordinary wave propagating quasi-parallel with respect to the external magnetic field. IntroductionMicrowave plasma discharges are extensively used in various branches of plasma technology, such as thin-film deposition, plasma etching, surface ion treatment and sputtering, sources of positive and negative ion beams, etc. A significant part of such discharges operate at low gas pressure with the plasma being heated through electron cyclotron resonance (ECR) and confined magnetically, e.g. in toroidal devices [1] and gasdynamic traps [2]. Electromagnetic emission from ECR-heated ITER-like high temperature plasmas, is used for imaging system with spatial resolution [3], for example.

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“…Recently, there has been some interest in such experi ments in the context of comparing laboratory results with space based observations to better understand the physics of the processes involved. These works revealed new effects, e.g., relaxation oscillations of CI in a decaying plasma (i.e., in the absence of a particle source) [29,30]. In this case an effective source is pro vided by the decrease of the collisional damping of waves during the decay of the background plasma [31].…”

Section: Self Consistent Theory Of Cyclotron Instabilitymentioning

confidence: 99%

Victor Trakhtengerts: His contribution to space plasma physics

Демехов

2015

Cosmic Res

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A brief overview is given of the works by Victor Trakhtengerts to show his contribution to the development of space plasma physics. The focus is on the following areas of his research: cyclotron inter action of waves and particles in the Earth's magnetosphere and related matters; resonance processes in mag netosphere-ionosphere interaction; nonlinear phenomena accompanying the impact of powerful HF radia tion on ionospheric plasma; and collective effects in atmospheric electricity.

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Generation of Electromagnetic Bursts in the Plasma Cyclotron Maser

Cited by 13 publications

References 20 publications

Electron cyclotron plasma startup in the GDT experiment

Electron cyclotron plasma startup in the GDT experiment

Dynamic regimes of cyclotron instability in the afterglow mode of minimum-Belectron cyclotron resonance ion source plasma

Victor Trakhtengerts: His contribution to space plasma physics

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