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| Home » Plasma Dictionary - T » Transport, In Plasmas |
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| Plasma Dictionary |
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| Plasma Dictionary - Terms Started With Alphabet T |
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Term : Transport, in Plasmas
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Definition : The problem of understanding the motions of particles in a plasma (and the related flows of energy, momentum, and other physical quantities) is extremely important in many if not all areas of plasma research. The theory of transport in plasmas is highly complex, but an understanding of transport is vital to controlled fusion research (where insufficient energy confinement is a major obstacle to producing fusion energy), plasma astrophysics (where radiation transport through plasmas often plays a dominant role), and many other areas including high energy-density plasmas, plasma processing of materials, space plasmas, and more. Since plasmas are many-body systems, it is not possible to follow all 6 degrees of freedom of each particle in the plasma, and consequently statistical methods and fluid theories must be employed, though even these often prove barely tractable for realistic situations. The wide variety of possible plasma conditions (spanning over 30 orders of magnitude in density and over 6 orders of magnitude in temperature) leads to a wide range of phenomena, including flows, turbulence, waves and nonlinear wave-particle interactions, and shocks. Specific approximations are generally needed to treat specific classes of plasma conditions over specific time and distance scales. Some key topics in plasma transport research include the determination of transport coefficients such as viscosity and diffusivity, and related parameters such as electrical conductivity and particle and energy confinement times.
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A planet (from the Greek planete means "wanderer" or
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