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Conventional Fusion FAQ Glossary Part 21/26 (U)


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Archive-name: fusion-faq/glossary/u
Last-modified: 25-Feb-1995
Posting-frequency: More-or-less-quarterly
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!!!).

See reader questions & answers on this topic! - Help others by sharing your knowledge
===============================================================
Glossary Part 21:  Terms beginning with "U"

FREQUENTLY USED TERMS IN CONVENTIONAL FUSION RESEARCH 
AND PLASMA PHYSICS

Edited by Robert F. Heeter, rfheeter@pppl.gov

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.


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