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- Path: senator-bedfellow.mit.edu!faqserv
- From: Robert F. Heeter <rfheeter@princeton.edu>
- Newsgroups: sci.physics.fusion,sci.answers,news.answers
- Subject: Conventional Fusion FAQ Glossary Part 24/26 (X)
- Supersedes: <fusion-faq/glossary/x_934543711@rtfm.mit.edu>
- Followup-To: sci.physics.fusion
- Date: 11 Nov 1999 12:26:39 GMT
- Organization: Princeton University
- Lines: 55
- Approved: news-answers-request@MIT.EDU
- Distribution: world
- Expires: 23 Feb 2000 12:24:17 GMT
- Message-ID: <fusion-faq/glossary/x_942323057@rtfm.mit.edu>
- References: <fusion-faq/glossary/intro_942323057@rtfm.mit.edu>
- Reply-To: rfheeter@pppl.gov
- NNTP-Posting-Host: penguin-lust.mit.edu
- Summary: Fusion energy represents a promising alternative to
- fossil fuels and nuclear fission for world energy
- production. This Glossary is a compendium of Frequently Used
- Terms in Plasma Physics and Fusion Energy Research. Refer
- to the FAQ on Conventional Fusion for more detailed info
- about topics in fusion research. This Glossary does NOT
- discuss unconventional forms of fusion (like Cold Fusion).
- X-Last-Updated: 1995/02/26
- Originator: faqserv@penguin-lust.MIT.EDU
- Xref: senator-bedfellow.mit.edu sci.physics.fusion:44272 sci.answers:10869 news.answers:170855
-
- Archive-name: fusion-faq/glossary/x
- 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!!!).
-
- ===============================================================
- Glossary Part 24: Terms beginning with "X"
-
- 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).
- ==================================================================
-
- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-
- # Xe: Chemical symbol for the element Xenon.
-
- * X-Point: Place where the poloidal magnetic field vanishes in such
- a way that two flux surfaces appear to cross, e.g. where the main
- plasma joins the divertor (see entry) or between magnetic islands.
- Location where magnetic reconnection takes place. (See magnetic
- reconnection; see also divertors and O-point.)
-
- & X Ray: A penetrating form of electromagnetic radiation emitted
- either when the inner orbital electrons of an excited atom
- return to their normal state (characteristic x-rays), or when a
- high speed electron collides sharply with an ion or atomic target
- (bremsstrahlung). X-rays have energies from roughly 100 eV to
- roughly 100 keV. (Below X-rays are ultraviolet rays, and above
- X-rays in energy are gamma rays.) X-rays are (basically by
- definition) non-nuclear in origin. (Nuclear electromagnetic
- radiation termed gamma radiation.) See also ultraviolet, gamma
- rays, bremsstrahlung.
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