Plasma instability in ECR heated ion sources

Pu, Yanxu; Halverson, W.

doi:10.1109/plasma.1990.110711

Cited by 2 publications

(2 citation statements)

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“…The drift waves were also named as dissipative modes which seem to be arising at lower gas pressures. Strong low-frequency instabilities were also observed by Pu et al [28], who studied the behavior with radio frequency and rf power. They have given a theoretical model which concluded that the instability is also a drift wave type.…”

Section: Trends Of Instability Frequencysupporting

confidence: 54%

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Kumar

Sharma

et al. 2018

Phys. Rev. Accel. Beams

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The plasma instabilities play an important role in an electron cyclotron resonance (ECR) ion source for the production of intense heavy ion beams in high charge states for particle accelerators. The geometrical and operational constraints of ECR sources hinder the trapping of ions for a sufficient time to get fully ionized with maximum efficiency. This problem is looked at in detail by studying the plasma instabilities in ECR ion sources. The ECR environment is full of complex rearrangements of various electric and magnetic fields to define a sustainable trap for the ions. The maximum frequency of plasma instability has been observed to be of 122.5 kHz under a set of sustainable plasma parameters. However, this limit may be pushed further if the plasma is overdriven in terms of source parameters. The instabilities cover a full regime of few tens of Hz to few hundreds of kHz under various operating conditions of radio frequency (rf), negative bias voltage, rf power and injection gas pressure. The rigorous details of frequencies and amplitudes of plasma instabilities are being reported by studying the Fourier spectrum of extracted and analyzed beam intensity. The plasma instabilities are attributed as drift waves in an inhomogeneous ECR plasma generated by the application of radio-frequency fields.

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Section: Trends Of Instability Frequencysupporting

confidence: 54%

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Kumar

Sharma

et al. 2018

Phys. Rev. Accel. Beams

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“…Electrons present \uithin the magnetic bottle can easily acquire large kinetic energies perpendicular to the magnetic field and become trapped in the plasma (h and Halverson 1990). These trapped electrons create an electrostatic potential well for ions which in tum are confined long enough to undergo multiple ionizations through successive collisions with hot electrons (Geller et al 1987, Pu andHalverson 1990).…”

Section: Methodsmentioning

confidence: 99%

The elusive CH²⁺ion

Wetzel

Welton

Thomas

et al. 1993

J. Phys. B: At. Mol. Opt. Phys.

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Experiments with an electron cyclotron resonance ion source have been employed in a hunt for the elusive CH2+ ion. The authors' experiments do not find evidence for the existence of stable CH2+ ions. Different levels of ab initio molecular orbital theory have been employed to obtain potential energy curves for CH2+. Although SCF calculations show a small minimum in the potential, post-Hartree-Fock computations indicate CH2+ states to be repulsive.

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Plasma instability in ECR heated ion sources

Cited by 2 publications

References 0 publications

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

The elusive CH²⁺ion

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Plasma instability in ECR heated ion sources

Cited by 2 publications

References 0 publications

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

Experimental investigation of plasma instabilities by Fourier analysis in an electron cyclotron resonance ion source

The elusive CH2+ion

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The elusive CH²⁺ion