Review of the State-of-the-Art Development of the Spherical Theta Pinch Plasma Source

Loisch, Gregor; Xu, Genhui; Cistakov, K.; Fedjuschenko, A.; Iberler, M.; Liu, Ying; Rienecker, T.; Schönlein, A.; Senzel, Florian; Wiechula, J.; Jacoby, J.

doi:10.1109/tps.2014.2309976

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…The graph is similar to results of an argon plasma, published earlier. 1,3 Here, also an optimum voltage to pressure ratio was found and at some voltages ranges of nearly constant average density were observed. The formerly presented theory 1,3 of a pay-off between a pressure dependent plasma resistance and particle acceleration by the induction current rise rates, which is determined by the initial capacitor voltage, is believed to apply to the hydrogen plasma similarly.…”

Section: Electron Densitymentioning

confidence: 60%

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Hydrogen plasma dynamics in the spherical theta pinch plasma target for heavy ion stripping

Loisch

Blažević

et al. 2015

Phys. Plasmas

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Due to the superior ability of dense and highly ionised plasmas to ionise penetrating heavy ion beams to degrees beyond those reachable by common gas strippers, many experiments have been performed to find suitable plasma generators for this application. In the field of gas discharges, mainly z-pinch devices have been investigated so far, which are known to be limited by the nonlinear focusing effects of the plasma columns sustaining current and by electrode erosion. The spherical theta pinch has therefore been proposed as a substitution for the z-pinch, promising progress by inductive rather than capacitive coupling and displacement of the outer magnetic field by the dense, diamagnetic discharge plasma. As yet mainly experiments with argon/hydrogen mixture gas have been performed, which is not suitable for the application as a plasma stripper, this paper describes the first detailed analysis of the plasma parameters and dynamics of a hydrogen plasma created by the spherical theta pinch. These include the time integrated and time resolved electron density, the dynamics of the plasma in the discharge vessel, the comparison with the argon dominated plasma, and an outlook to reachable characteristics with similar devices. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Electron Densitymentioning

confidence: 60%

“…1,3 With the average, overall density regions of favourable voltage and pressure parameters can be identified, where the discharge can be investigated further with a focus on application specific criteria like maximum density, stability, etc.…”

Section: Electron Densitymentioning

confidence: 99%

Hydrogen plasma dynamics in the spherical theta pinch plasma target for heavy ion stripping

Loisch

Blažević

et al. 2015

Phys. Plasmas

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“…In such ICPs, the magnetic field produced by the primary current, is confined inside a magnetic path loop outside the plasma. An example of an opposite case with a strong AC magnetic field in plasma due to the primary current is a spherical theta pinch [21].…”

Section: Electromagneticsmentioning

confidence: 99%

Inductively coupled plasmas at low driving frequencies

Kolobov

Godyak

2017

Plasma Sources Sci. Technol.

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We discuss the peculiarities of inductively coupled plasma (ICP) at low driving frequencies. The ratio of electric to magnetic field, E cB , | ()| decreases with decreasing frequency according to Faraday's law-higher magnetic fields are required to induce the same electric field at lower frequencies. We point out that the ratio of E cB | ()| can be non-uniform in space depending on primary coil configuration and the presence of ferromagnetic materials. In this paper, we consider examples of low-frequency ICPs with negligibly small magnetic fields in plasma. The disparity of time scales for ion transport and the electron energy relaxation results in nonlinear plasma dynamics at low frequencies. Numerical simulations demonstrate that at low frequencies, the presence of plasma has very little effect on spatial distributions of the electric and magnetic fields, which are determined solely by the coil geometry and by the presence of ferromagnetic cores. Simulations of plasma dynamics in ICP over a wide range of driving frequencies and gas pressures illustrate high-frequency, quasi-static and dynamic regimes of discharge operation and explain some trends observed in experiments.

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“…The measurements for the electron density are supplemented by visual images taken with a fast gated camera in order to study the plasma dynamics of the propagation of the plasma sheaths, beginning with their ejection until their collision in the middle of a small vacuum chamber. The main attempt of the setup is to perform basic research of the collision process from the accelerated plasma sheaths in regard to use it as a plasma target [6][7][8] for the investigation of ion beam plasma interaction and to study the UV and VUV radiation from the collision zone. In order to develop the colliding plasma as an UV/VUV radiation source, a suitable ionization degree is required since only a few neutral argon appear in the VUV region.…”

Section: Introductionmentioning

confidence: 99%

Electron density and plasma dynamics of a colliding plasma experiment

et al. 2016

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We present experimental results of two head-on colliding plasma sheaths accelerated by pulsed-power-driven coaxial plasma accelerators. The measurements have been performed in a small vacuum chamber with a neutral-gas prefill of ArH2 at gas pressures between 17 Pa and 400 Pa and load voltages between 4 kV and 9 kV. As the plasma sheaths collide, the electron density is significantly increased. The electron density reaches maximum values of ≈8 ⋅ 1015 cm−3 for a single accelerated plasma and a maximum value of ≈2.6 ⋅ 1016 cm−3 for the plasma collision. Overall a raise of the plasma density by a factor of 1.3 to 3.8 has been achieved. A scaling behavior has been derived from the values of the electron density which shows a disproportionately high increase of the electron density of the collisional case for higher applied voltages in comparison to a single accelerated plasma. Sequences of the plasma collision have been taken, using a fast framing camera to study the plasma dynamics. These sequences indicate a maximum collision velocity of 34 km/s.

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Review of the State-of-the-Art Development of the Spherical Theta Pinch Plasma Source

Cited by 6 publications

References 20 publications

Hydrogen plasma dynamics in the spherical theta pinch plasma target for heavy ion stripping

Hydrogen plasma dynamics in the spherical theta pinch plasma target for heavy ion stripping

Inductively coupled plasmas at low driving frequencies

Electron density and plasma dynamics of a colliding plasma experiment

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