A compact and continuously driven supersonic plasma and neutral source

Asai, Tomohiko; Itagaki, Hideyuki; Numasawa, H.; Terashima, Yuki; Hirano, Y.; Hirose, Akira

doi:10.1063/1.3483213

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…The velocity of the CT and tracer ions at the drift tube are inferred by the time-of-flight (TOF) method [7] using collimated fibers and photomultiplier tubes (PMTs) with optical filters (Fibers 1, 2, 3, and 4 in Fig. 4).…”

Section: Methodsmentioning

confidence: 99%

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Seki

Kobayashi

Sasaki

et al. 2020

Plasma and Fusion Research

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Studying impurity behavior in a magnetically confined plasma is essential for fusion reactor developments. A tracer-containing compact toroid (TCCT) injection have been developed as a new tracer injection technique for studying impurity accumulation and behavior in magnetically confined fusion plasmas. We generated and ejected the TCCT using a compact toroid (CT) injector that had successfully demonstrated CT injection fueling into a large field-reversed configuration (FRC). Tracer ions, e.g., tungsten, copper, and aluminum, are supplied by an independently controlled tracer source attached to the CT injector. The plasma containing tracer ions is accelerated and ejected by Lorentz self-force as the TCCT. To investigate whether tracer ions can be injected into the plasma without separation from the TCCT, we experiment by injecting the TCCT injection into a transverse magnetic field, emulating a confinement magnetic field of the FRC plasma.

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Section: Methodsmentioning

confidence: 99%

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Seki

Kobayashi

Sasaki

et al. 2020

Plasma and Fusion Research

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“…A miniature gun [4] has been developed as a new PI system to reduce excess neutral gas. Figure 3 shows the diagram of the experimental setup of the miniature gun with the discharge circuit.…”

Section: Pre-ionization System (Miniature Gun)mentioning

confidence: 99%

“…Figure 1 shows a schematic drawing of the developed MCPG. It consists of a set of coaxial cylindrical electrodes, iron-core bias coil, gas injection ports, and a miniature gun [4] as a PI system. The outer diameter of the inner electrode is ϕ 54.0 mm, and the inner diameter of the outer electrode is ϕ 83.1 mm.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of a Magnetized Coaxial Plasma Gun by Adopting Iron-Core Bias Coil and Pre-Ionization Systems

Edo

Asai

Tanaka

et al. 2018

Plasma and Fusion Research

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A magnetized coaxial plasma gun (MCPG) is utilized to generate a compact toroid (CT). An MCPG-type CT injector had been developed as a particle refueling system for C-2/C-2U field-reversed configuration (FRC) plasmas. To inject CTs repetitively for a long-lived plasma, the injector has been upgraded. Iron-core bias coil system has been adopted to generate stationary bias magnetic field. Typical MCPG systems use excess neutral gas to produce a breakdown; therefore, the excess gas tends to flow into the confinement vessel and cool off the edge plasma as well as the target plasma. This negative effect is more serious for repetitive CT injection so that a pre-ionization (PI) system is required to reduce initial gas amount. By injecting the initial plasma using the PI system, amount of the neutral gas for the injector can be reduced. The combination of these systems also expands operating range of the injector. By moving the iron-core bias coil, the radial magnetic field can be controlled. The PI system can easily produce breakdown; therefore, the MCPG can be operated at lower gas pressure, reduced by approximately 40 %. The optimum CT has higher velocity (>100 km/s) and ion temperature (>70 eV), increased by more than 40 %.

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“…There is a long history about the research on plasma produced by plasma guns. [1][2][3][4][5][6][7][8][9][10][11][12][13] Plasma guns have a wide range of applications in plasma physics, controlled fusion research and astrophysics. They can be used as a source of target plasma, in mirror experiments [14], trigger toroidal discharges [15], provide high density plasma for ion extraction [16], can be used to accelerate pellets for fuelling fusion devices [17] and to simulate astrophysical phenomena [2,18].…”

Section: Introductionmentioning

confidence: 99%

A Compact Plasma System for Experimental Study

Sahoo

Paikaray

Samantaray

et al. 2013

AMM

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A compact plasma system is set up at Ravenshaw University, India. The plasma system consists of a curved vacuum chamber which is nothing but a part of a toroid (θ=700) having minor radius, r= 0.3 m and major radius, R= 0.5 m, vacuum system, electromagnet, gas injected washer stacked plasma gun to produce plasma blobs/filaments, pulse forming network to energise plasma gun, diagnostic tools like electric probes, magnetic probes, spectrometer, high speed CCD camera, digital pulse/delay generator to synchronise the diagnostic tools. A pair of copper coil is wound over the chamber and capacitive pulse is fed to the coil to produce non-uniform magnetic field inside the chamber. The gas injected washer stacked plasma gun is a mono-anode - multi cathode system having five cathodes made up of brass and an anode made up of copper. The gun impedance is ~ 15 Ω. The pulse forming network (PFN) is Guillemin E type which consists of capacitors having equal capacitance 5.5 μF and inductors having equal inductances 1.5 μH. The pulse width of the PFN is ~ 7.6 μs for a seven stage network, as tested with known resistive circuit. Magnetic probes are designed and calibrated using a Helmholtz coil to map the radial magnetic field profile of the plasma chamber. Electric probes like Langmuir triple probe, velocity probes are designed to measure plasma parameters like blob velocity, density, temperature etc. Emission spectroscopy method is used to identify charged species inside the plasma. High speed CCD camera is used to interpret the structure of the plasma. A digital pulse/trigger generator is used to synchronise the CCD, spectrometer and switching thyristor etc. Preliminary results are also reported.

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A compact and continuously driven supersonic plasma and neutral source

Cited by 8 publications

References 8 publications

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Behavior of a Tracer-Containing Compact Toroid in a Transverse Magnetic Field

Performance Improvement of a Magnetized Coaxial Plasma Gun by Adopting Iron-Core Bias Coil and Pre-Ionization Systems

A Compact Plasma System for Experimental Study

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