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Plasma-Wall Interactions

Abstract

The problem of impurities in fusion plasmas has been recognized since the beginning of the fusion programme. Early experiments in glass vacuum vessels released gas from the wall to such an extent that the radiation from the impurities prevented the plasma from being heated above about 50 eV. The radiative power loss is principally due to line radiation from partially stripped ions, which is particularly a problem during the plasma startup phase. Another problem is fuel dilution, which arises because impurity atoms produce many electrons and, for a given plasma pressure, these electrons take the place of fuel particles. Impurities can also lead to disruptions, as a result of edge cooling and consequent current profile modification. The fractional impurity level which radiates 10% of the total thermonuclear power for a 10 keV plasma is 50% for helium, 7% for carbon, and less than 0.1% for molybdenum. Clearly, impurities of low atomic number are a much less serious problem than those of high atomic number. (author)
Authors:
Li, J; Chen, J L; [1]  Guo, H Y; [2]  Institute of Plasma Physics, Chinese Academy of Sciences (China)]; McCracken, G M [3] 
  1. Institute of Plasma Physics, Chinese Academy of Sciences (China)
  2. Tri Alpha Energy (United States)
  3. Culham Science Centre, UKAEA, Abingdon (United Kingdom)
Publication Date:
Sep 15, 2012
Product Type:
Book
Resource Relation:
Other Information: 36 figs., 3 tabs., 181 refs.; Related Information: In: Fusion Physics| by Kikuchi, Mitsuru; Lackner, Karl; Tran, Minh Quang (eds.)| 1158 p.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMIC NUMBER; CARBON; CONTAINERS; COOLING; DILUTION; ELECTRONS; EV RANGE; FUEL PARTICLES; HELIUM; IONS; KEV RANGE; MOLYBDENUM; PLASMA; PLASMA IMPURITIES; PLASMA PRESSURE; POWER LOSSES; WALL EFFECTS
OSTI ID:
22028537
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISBN 978-92-0-130410-0; TRN: XA12R0291116803
Availability:
Also available on-line: http://www-pub.iaea.org/MTCD/Publications/PDF/Pub1562_web.pdf; Enquiries should be addressed to IAEA, Marketing and Sales Unit, Publishing Section, E-mail: sales.publications@iaea.org; Web site: http://www.iaea.org/books
Submitting Site:
INIS
Size:
page(s) 756-846
Announcement Date:
Jan 18, 2013

Citation Formats

Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M. Plasma-Wall Interactions. IAEA: N. p., 2012. Web.
Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], & McCracken, G M. Plasma-Wall Interactions. IAEA.
Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M. 2012. "Plasma-Wall Interactions." IAEA.
@misc{etde_22028537,
title = {Plasma-Wall Interactions}
author = {Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M}
abstractNote = {The problem of impurities in fusion plasmas has been recognized since the beginning of the fusion programme. Early experiments in glass vacuum vessels released gas from the wall to such an extent that the radiation from the impurities prevented the plasma from being heated above about 50 eV. The radiative power loss is principally due to line radiation from partially stripped ions, which is particularly a problem during the plasma startup phase. Another problem is fuel dilution, which arises because impurity atoms produce many electrons and, for a given plasma pressure, these electrons take the place of fuel particles. Impurities can also lead to disruptions, as a result of edge cooling and consequent current profile modification. The fractional impurity level which radiates 10% of the total thermonuclear power for a 10 keV plasma is 50% for helium, 7% for carbon, and less than 0.1% for molybdenum. Clearly, impurities of low atomic number are a much less serious problem than those of high atomic number. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}