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=============================================================== Glossary Part 21: Terms beginning with "U" FREQUENTLY USED TERMS IN CONVENTIONAL FUSION RESEARCH AND PLASMA PHYSICS Edited by Robert F. Heeter, email@example.com 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). ================================================================== UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU # u: variable commonly used for energy density of electric or magnetic fields; also sometimes used for velocity. @ UT, UTA: University of Texas at Austin; see entry @ UV: Ultraviolet (range of the electromagnetic spectrum) @ UW, UWM: University of Wisconsin at Madsion; see entry & Ultraviolet: Region of the electromagnetic spectrum intermediate between the visible and the x-ray portions. UV photons have energies greater than a few eV, but less than (roughly) 100 ev to 1 keV. * Unipolar Arc: Arc between a metal surface and a plasma in contact with it. Such an arc requires only one electrode and is maintained by the thermal energy of the electrons. & Universal gas constant: R = 8.314 x 10^7 ergs per degree C per mole. * Universal Instability: Low-frequency instability resulting from the presence of density gradients perpendicular to the magnetic field lines. An instability of this type is generally localized and usually has a small rate of growth. % University of Texas at Austin (UT): Among other things, UT has a large theoretical plasma physcs research center. (info, anyone?) The TEXT experimental tokamak is also located here. % University of Wisconsin at Madison: Among other facilities, "Wisconsin" has a large research program in both plasma physics and fusion engineering. * Upper Hybrid Waves: Similar to lower hybrid waves, but at a higher frequency. (more description?) Not truly propagating waves, but plasma oscillations. (?) & Uranium: (from Herman) A radioactive metallic element whose isotope, uranium-235, is a nuclear fission fuel. Plutonium, another fission fuel, can be produced from the more plentiful isotope uranium-238.