Plasmadynamic hypervelocity dust injector for the National Spherical Torus Experiment

Ticoş, C. M.; Wang, ‪Zhehui; Dorf, L.; Wurden, G. A.

doi:10.1063/1.2219384

Cited by 23 publications

(10 citation statements)

References 12 publications

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“…A compact coaxial plasma gun was used to produce the high density plasma. 31 An example of electric characteristics of the gun is shown in Fig. 11; from top to bottom: voltage drop across the coaxial electrodes ͑V g ͒, electric current I g , and a photodiode signal.…”

Section: B Results From the Type II Experimentsmentioning

confidence: 99%

“…2͒, we produce higher density plasma of deuterium using a different compact coaxial gun described previously. 31 The compact coaxial gun is mounted to the side of the FMP vacuum tank, allowing us better viewing and diagnostic access ϳ1 m downstream of the plasma gun muzzle. There is no pre-existing plasma in the large vacuum tank for the type II experiment.…”

Section: Methodsmentioning

confidence: 99%

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Dust trajectories and diagnostic applications beyond strongly coupled dusty plasmas

2007

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Plasma interaction with dust is of growing interest for a number of reasons. On the one hand, dusty plasma research has become one of the most vibrant branches of plasma science. On the other hand, substantially less is known about dust dynamics outside the laboratory strongly coupled dusty-plasma regime, which typically corresponds to 1015m−3 electron density with ions at room temperature. Dust dynamics is also important to magnetic fusion because of concerns about safety and potential dust contamination of the fusion core. Dust trajectories are measured under two plasma conditions, both of which have larger densities and hotter ions than in typical dusty plasmas. Plasma-flow drag force, dominating over other forces in flowing plasmas, can explain the dust motion. In addition, quantitative understanding of dust trajectories is the basis for diagnostic applications using dust. Observation of hypervelocity dust in laboratory enables dust as diagnostic tool (hypervelocity dust injection) in magnetic fusion. In colder plasmas (∼10eV or less), dust with known physical and chemical properties can be used as microparticle tracers to measure both the magnitude and directions of flows in plasmas with good spatial resolution as the microparticle tracer velocimetry.

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Section: B Results From the Type II Experimentsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dust trajectories and diagnostic applications beyond strongly coupled dusty plasmas

2007

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“…is shown in Fig.1 [13]. The design of the coaxial gun is similar to models that have been previously described in the literature [4,8].…”

Section: Report Datementioning

confidence: 92%

Hypervelocity Dust Storm Launched With a Coaxial Plasma Gun

Ticoş

Wang

Wurden

2008

IEEE Trans. Plasma Sci.

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A dust storm consisting of carbon grains accelerated to speeds up to ~3 km/s has been launched by a plasma jet produced in a coaxial gun. Diamond and graphite powders with grain radii of 0.5 to 30 microns have been used. A distinctive feature of this plasma accelerator is that it can use different types of gases and can operate with microparticles having any shape and a large range of sizes. Deuterium gas and carbon dust is chosen to be compatible with fusion plasmas as a diagnostic tool. The operating voltages of the coaxial gun are between 5 and 10 kV and the maximum measured discharge current is ~250 kA. Imaging of the plasma jet exiting the gun with speeds of 25 to 60 km/s and accelerated by the B J × force shows a good collimation of the flow for about 1.5 m, before it diffuses into a large a vacuum tank.

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“…2012), a plasma-drag accelerator (Ticos et al. 2006 b ) and a mechanical lithium propeller (Mansfield et al. 2013).…”

Section: Experimental Aspects Of Mpimentioning

confidence: 99%

Existing and new applications of micropellet injection (MPI) in magnetic fusion

et al. 2016

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The intense heat and energetic particle fluxes expected in ITER and future magnetic fusion reactors pose prohibitive problems to the design, selection and maintenance of the first wall and divertor. Micropellet injection (MPI) technologies can offer some innovative solutions to the material and extreme heat challenges. Basic physics of micropellet motion, ablation and interactions with high-temperature plasmas and energetic particles are presented first. We then discuss MPI technology options and applications. In addition to plasma diagnostic applications, controlled injection of micropellets of different sizes, velocities and injection frequencies will offer several possibilities: (1) better assessment of the core plasma cooling due to dust produced in situ; (2) better understanding of the plasma–material interaction physics near the wall; (3) new methods for plasma fuelling and impurity control; and (4) techniques for edge cooling with minimal impact on the plasma core. Dedicated small-scale laboratory experiments will complement major fusion experiments in development and applications of MPI.

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Plasmadynamic hypervelocity dust injector for the National Spherical Torus Experiment

Cited by 23 publications

References 12 publications

Dust trajectories and diagnostic applications beyond strongly coupled dusty plasmas

Dust trajectories and diagnostic applications beyond strongly coupled dusty plasmas

Hypervelocity Dust Storm Launched With a Coaxial Plasma Gun

Existing and new applications of micropellet injection (MPI) in magnetic fusion

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