Self-neutralized ion beam

Salvadori, M. C.; Teixeira, F. S.; Nikolaev, A. G.; Savkin, K. P.; Окс, Е. М.; Spädtke, P.; Yu, K. M.; Brown, I.G.

doi:10.1063/1.3638714

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The scenario of FPF at 250 V has the oscillation block-like 1 5 1 1 along with oscillation 1 5 1 0 and so on. The FPF at 260 V is also an irregular MMO and its oscillation blocks are initiated with the pattern 1 4 1 1 then 1 5 1 1 in a random manner. Further increasing the discharge voltage to 270 V, an order blocks as 1 6 1 1 1 1 and its recurrences can be understood in the entire time series, as shown in figure 2(d 1 ), which transform into regular MMOs from irregular MMOs.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…Initially, a plasma sheath was originated for plane geometries [1] and later on expanded to various geometries such as cylindrical [2] and spherical [3]. The importance of introducing a grid is of great interest for ion beam sources [4], velocity analyzers [5], electrostatic confinement schemes [6] and antennas for electrostatic waves. In a double plasma device, low-frequency waves are impulsively excited in a double layer generated by ion injection into the target chamber [7].…”

Section: Introductionmentioning

confidence: 99%

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Occurrence of ionization instability associated with plasma bubble in glow discharge magnetized plasma

Megalingam

Sarma

2019

Plasma Sci. Technol.

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Floating potential fluctuations of glow discharge magnetized plasma are found to expose mixed mode oscillations (MMOs) in the existence of plasma bubble. Plasma bubble has been formed by emerging density gradient in the form of a sheath around a cylindrical and spherical grid to a critical value of applied potential. Two Langmuir probes, LP 1 and LP 2 , are retained in the ambient plasma to collect the plasma floating potential fluctuations at two different locations of the plasma system. The perceived instability pattern shows regular-irregular-regular MMOs under various imposed conditions. Furthermore, various nonlinear techniques such as phase space plot, recurrence plot and Hurst exponent have been executed to understand the underlying dynamical behavior of the system. Low-frequency (∼200-1200 Hz) oscillations are also supposed and are inferred as ion-acoustic waves excited by ionization instability. The observed results are then validated with the theory of the instability based on a fluid hydrodynamic approach.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Occurrence of ionization instability associated with plasma bubble in glow discharge magnetized plasma

Megalingam

Sarma

2019

Plasma Sci. Technol.

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“…In a number of studies, the explanation is used that the compensation of the surface charge of the ion beam target can have a direct influence on the compensation of the space charge of the ion beam [26,27]. However, there are objective reasons showing that this is not enough.…”

Section: Introductionmentioning

confidence: 99%

Neutralization of the Surface Charge of an Insulated Target under the Interaction of High-Energy Metal Ion Beams

Savkin

Окс

Nikolaev

et al. 2023

QuBS

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The interaction of ion beams with dielectric materials is an urgent problem, both from the point of view of practical application in ion implantation processes and for understanding the fundamental processes of charge compensation and the effective interaction of beam ions with a target surface. This paper presents the results of studies of the processes of compensation of the surface charge of an insulated collector upon interaction with a beam of metal ions with energies up to 50–150 keV. At low pressure (about 10−6 torr), removing the collector from the region of extraction and beam formation makes it possible to reduce the floating potential to a value of 5–10% of the total accelerating voltage. This phenomenon allows for the efficient implantation of metal ions onto the surface of alumina ceramics. We have shown that the sheet resistance of dielectric targets depends on the material of the implanted metal ions and decreases with an increase in the implantation dose by 3–4 orders of magnitude compared with the initial value at the level of 1012 Ω per square.

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Oscillating plasma bubbles. III. Internal electron sources and sinks

Stenzel

Urrutia

2012

Physics of Plasmas

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An internal electron source has been used to neutralize ions injected from an ambient plasma into a spherical grid. The resultant plasma is termed a plasma “bubble.” When the electron supply from the filament is reduced, the sheath inside the bubble becomes unstable. The plasma potential of the bubble oscillates near but below the ion plasma frequency. Different modes of oscillations have been observed as well as a subharmonic and multiple harmonics. The frequency increases with ion density and decreases with electron density. The peak amplitude occurs for an optimum current and the instability is quenched at large electron densities. The frequency also increases if Langmuir probes inside the bubble draw electrons. Allowing electrons from the ambient plasma to enter, the bubble changes the frequency dependence on grid voltage. It is concluded that the net space charge density in the sheath determines the oscillation frequency. It is suggested that the sheath instability is caused by ion inertia in an oscillating sheath electric field which is created by ion bunching.

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Self-neutralized ion beam

Cited by 8 publications

References 21 publications

Occurrence of ionization instability associated with plasma bubble in glow discharge magnetized plasma

Occurrence of ionization instability associated with plasma bubble in glow discharge magnetized plasma

Neutralization of the Surface Charge of an Insulated Target under the Interaction of High-Energy Metal Ion Beams

Oscillating plasma bubbles. III. Internal electron sources and sinks

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