The superconducting electron cyclotron resonance 6.4 GHz high-<i>B</i> mode and frequency scaling in electron cyclotron resonance ion sourcesa)

Antaya, T. A.; Gammino, S.

doi:10.1063/1.1144866

Cited by 58 publications

(29 citation statements)

References 2 publications

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“…The magnetic field configuration serves for three purposes: (i) it provides a closed surface with constant magnetic flux density satisfying the condition for resonant energy transfer from the microwave radiation to the plasma electrons, i.e., ω RF = eB ECR /m e , (ii) enables sufficient plasma confinement for the production of highly charged ions through electron impact ionization, and (iii) suppresses magnetohydrodynamic (MHD) instabilities 1 by satisfying the conditions ∂B/∂r > 0 and β ≪ 1 and where β is the ratio of particle pressure n e kT e and magnetic pressure B 2 /2µ 0 .…”

Section: Introductionmentioning

confidence: 99%

Limitation of the ECRIS performance by kinetic plasma instabilities (invited)

Tarvainen

Kalvas

Koivisto

et al. 2015

Review of Scientific Instruments

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Limitation of the ECRIS performance by kinetic plasma instabilities (invited)Tarvainen, Olli; Kalvas, Taneli; Koivisto, Hannu; Komppula, Jani; Kronholm, Risto; Laulainen, Janne; Izotov, I.; Mansfeld, D.; Skalyga, V.; Toivanen, V.; Machicoane, G.Tarvainen, O., Kalvas, T., Koivisto, H., Komppula, J., Kronholm, R., Laulainen, J., . . . Machicoane, G. (2016 Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due to anisotropic electron velocity distribution. The instabilities are associated with strong microwave emission and periodic bursts of energetic electrons escaping the magnetic confinement. The instabilities explain the periodic ms-scale oscillation of the extracted beam current observed with several high performance ECRISs and restrict the parameter space available for the optimization of extracted beam currents of highly charged ions. Experiments with the JYFL 14 GHz ECRIS have demonstrated that due to the instabilities the optimum B min -field is less than 0.8B ECR , which is the value suggested by the semiempirical scaling laws guiding the design of ECRISs. C 2015 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Limitation of the ECRIS performance by kinetic plasma instabilities (invited)

Tarvainen

Kalvas

Koivisto

et al. 2015

Review of Scientific Instruments

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“…Based on vacuum evaporation method, a suitable demountable set-up has been fabricated for periodically applying a coating on the inner wall of the chamber. The coated chamber is then exposed to pure oxygen for a few hours to develop layers of Al 2 O 3 After the above process, beams of different gases were tried systematically. A drastic improvement in intensity and stability was observed in all the cases.…”

Section: P ∝ V N E T E τ Ementioning

confidence: 99%

“…It has undergone several modifications based on magnetic topology [2,3], external supply of cold electrons [4,5] and microwave feed to improve the performance. Initially, 6.4 GHz ECR ion source was designed for two-stage operation to study different aspects of firststage discharge, related to methods of microwave power feed and overall ion production performance.…”

Section: Introductionmentioning

confidence: 99%

6.4 GHz ECR ion source at VECC

2002

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The 6.4 GHz ECR ion source that was indigenously developed a few years ago has been operating continuously for injecting oxygen and neon beams to the cyclotron since 1997. VEC-ECR is a single stage high magnetic field ion source provided with a negatively biased electron repeller placed on the axis, near the injection mirror point. The supply of cold electrons and use of low mass mixing gas improve the stability of ECR plasma. Very recently, the effect of aluminum oxide coating on the copper plasma chamber wall has been studied. The plasma chamber wall was coated with aluminum by vacuum evaporation method and then exposed to oxygen gas to form aluminum oxide. It was noticed that the process substantially shifts the charge state distribution to the higher charge state with an enhancement of ion current by an order of magnitude. With the aluminized plasma chamber, the VEC-ECR can now produce 12 µA of O 7· , 6.5 µA of Ar 12· , 1.5 µA of Kr 20· and 1.0 µA of Xe 31· .

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“…The advent of electron cyclotron resonance (ECR) ion sources [1,2] has created a tremendous impact on the production of high intensity beams of multiply charged positive ions. A low energy ion beam facility based on an ECR ion source was set up at Nuclear Science Centre to provide research facilities in the field of materials sciences, atomic and molecular physics.…”

Section: Introductionmentioning

confidence: 99%

ECR ion source based low energy ion beam facility

et al. 2002

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Mass analyzed highly charged ion beams of energy ranging from a few keV to a few MeV plays an important role in various aspects of research in modern physics. In this paper a unique low energy ion beam facility (LEIBF) set up at Nuclear Science Centre (NSC) for providing low and medium energy multiply charged ion beams ranging from a few keV to a few MeV for research in materials sciences, atomic and molecular physics is described. One of the important features of this facility is the availability of relatively large currents of multiply charged positive ions from an electron cyclotron resonance (ECR) source placed entirely on a high voltage platform. All the electronic and vacuum systems related to the ECR source including 10 GHz ultra high frequency (UHF) transmitter, high voltage power supplies for extractor and Einzel lens are placed on a high voltage platform. All the equipments are controlled using a personal computer at ground potential through optical fibers for high voltage isolation. Some of the experimental facilities available are also described.

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The superconducting electron cyclotron resonance 6.4 GHz high-B mode and frequency scaling in electron cyclotron resonance ion sourcesa)

Cited by 58 publications

References 2 publications

Limitation of the ECRIS performance by kinetic plasma instabilities (invited)

Limitation of the ECRIS performance by kinetic plasma instabilities (invited)

6.4 GHz ECR ion source at VECC

ECR ion source based low energy ion beam facility

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