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|a (TOE)ost1048374
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|a (TOE)1048374
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|a E 1.99:la-ur-12-23930
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|a E 1.99:la-ur-12-23930
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|a la-ur-12-23930
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|a Applications of high-speed dust injection to magnetic fusion
|h [electronic resource]
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|a Los Alamos, N.M. :
|b Los Alamos National Laboratory ;
|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2012.
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|a text
|b txt
|2 rdacontent.
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|a computer
|b c
|2 rdamedia.
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|a online resource
|b cr
|2 rdacarrier.
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|a Published through SciTech Connect.
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|a 08/08/2012.
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|a "la-ur-12-23930"
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|a Wang, Zhehui [Los Alamos National Laboratory]; Li, Yangfang [Max Planck Institute for Extraterrestrial Physics, Germany]
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|a It is now an established fact that a significant amount of dust is produced in magnetic fusion devices due to plasma-wall interactions. Dust inventory must be controlled, in particular for the next-generation steady-state fusion machines like ITER, as it can pose significant safety hazards and degrade performance. Safety concerns are due to tritium retention, dust radioactivity, toxicity, and flammability. Performance concerns include high-Z impurities carried by dust to the fusion core that can reduce plasma temperature and may even induce sudden termination of the plasma. We have recognized that dust transport, dust-plasma interactions in magnetic fusion devices can be effectively studied experimentally by injection of dust with known properties into fusion plasmas. Other applications of injected dust include diagnosis of fusion plasmas and edge localized mode (ELM)'s pacing. In diagnostic applications, dust can be regarded as a source of transient neutrals before complete ionization. ELM's pacing is a promising scheme to prevent disruptions and type I ELM's that can cause catastrophic damage to fusion machines. Different implementation schemes are available depending on applications of dust injection. One of the simplest dust injection schemes is through gravitational acceleration of dust in vacuum. Experiments at Los Alamos and Princeton will be described, both of which use piezoelectric shakers to deliver dust to plasma. In Princeton experiments, spherical particles (40 micron) have been dropped in a systematic and reproducible manner using a computer-controlled piezoelectric bending actuator operating at an acoustic (0,2) resonance. The circular actuator was constructed with a 2.5 mm diameter central hole. At resonance (≈ 2 kHz) an applied sinusoidal voltage has been used to control the flux of particles exiting the hole. A simple screw throttle located ≈1mm above the hole has been used to set the magnitude of the flux achieved for a given voltage. Particle fluxes ranging from a few tens of particle per second up to thousands of particles per second have been achieved using this simple device. To achieve higher dust injection speed, another key consideration is how to accelerate dust at controlled amount. In addition to gravity, other possible acceleration mechanisms include electrostatic, electromagnetic, gas-dragged, plasma-dragged, and laser-ablation-based acceleration. Features and limitations of the different acceleration methods will be discussed. We will also describe laboratory experiments on dust acceleration.
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|b AC52-06NA25396.
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|a Acceleration.
|2 local.
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|a Actuators.
|2 local.
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|a Dusts.
|2 local.
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|a Edge Localized Modes.
|2 local.
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|a Electron Temperature.
|2 local.
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|a Flammability.
|2 local.
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|a Implementation.
|2 local.
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|a Impurities.
|2 local.
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|a Ion Temperature.
|2 local.
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|a Bending.
|2 local.
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|a Plasma.
|2 local.
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|a Radioactivity.
|2 local.
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|a Resonance.
|2 local.
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|a Retention.
|2 local.
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|a Safety.
|2 local.
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|a Toxicity.
|2 local.
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|a Transients.
|2 local.
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|a Ionization.
|2 local.
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|a Tritium.
|2 local.
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|a Wall Effects.
|2 local.
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| 650 |
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|a Plasma Physics And Fusion Technology.
|2 edbsc.
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| 710 |
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|a Los Alamos National Laboratory.
|4 res.
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| 710 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 856 |
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|u http://www.osti.gov/scitech/biblio/1048374
|z Online Access (via OSTI)
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|a .b72744248
|b 03-09-23
|c 01-28-13
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|a web
|b 02-15-17
|c f
|d m
|e p
|f eng
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|h 0
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|a Information bridge
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|s 3b439163-2a15-5d48-971f-bea18227fb0d
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| 952 |
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:la-ur-12-23930
|h Superintendent of Documents classification
|i web
|n 1
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