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Subject: Conventional Fusion FAQ Glossary Part 21/26 (U)
This article was archived around: 11 Nov 1999 12:26:27 GMT
Disclaimer: While this section is still evolving, it should
be useful to many people, and I encourage you to distribute
it to anyone who might be interested (and willing to help!!!).
Glossary Part 21: Terms beginning with "U"
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).
# 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.