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=============================================================== Glossary Part 22: Terms beginning with "V" FREQUENTLY USED TERMS IN CONVENTIONAL FUSION RESEARCH AND PLASMA PHYSICS Edited by Robert F. Heeter, firstname.lastname@example.org Guide to Categories: * = plasma/fusion/energy vocabulary & = basic physics vocabulary > = device type or machine name # = name of a constant or variable ! = scientists @ = acronym % = labs & political organizations $ = unit of measurement The list of Acknowledgements is in Part 0 (intro). ================================================================== VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV # v: variable typically used for velocity # V: variable typically used for electrical potential (Voltage) $ V: abbreviation for Volts; see entry @ VDE: Vertical Displacement Event & Vector: & Vector Notation: & Velocity: The rate of change of position with time for a given object. & Velocity Space: Mathematical space where each point corresponds not to a certain location in reality, but to a certain velocity. Distribution functions typically involve mixes of both position and velocity spaces. (See distribution function.) Contrast with "position space" where each point corresponds to a given location. & Velocity Space Instability: A class of instabilities driven by particle distributions (in velocity space) which are not in thermal equilibrium. * Vertical Field, Vertical Field Coils: See Poloidal Field / Coils. * Vertical Instability: [mostly by James Crotinger] A type of MHD (n=0) instability where the plasma drifts vertically upward. Nearly all tokamaks are vertically unstable (all highly shaped ones are). Controlling this instability is possible in many cases, and is an important facet of machine design. Vertical instabilities give rise to halo effects (see entry for halo). & Viscosity: * Vlasov Equation: * Voltage Loop: A wire which encircles the main axis of a tokamak in the vicinity of the vacuum vessel. The voltage induced in this loop during the shot is a measure of the ohmic heating voltage induced by transformer action and applied to the plasma. $ Volt: Unit of electrical potential.