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Title Convective and nonconvective ion beam filamentation instabilities
Creator/Author Hubbard, R.F.
Publication Date1980 Jan 01
OSTI IdentifierOSTI ID: 5507835
Report Number(s)CONF-7910122-11
DOE Contract NumberAC08-79DP40101
Resource TypeConference
Specific TypeTechnical Report
Resource RelationConference: Heavy ion fusion workshop, Berkeley, CA, USA, 29 Oct 1979
Research OrgJAYCOR, Alexandria, VA (USA)
Subject70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM-PLASMA SYSTEMS; CONVECTIVE INSTABILITIES; I-BEAM TYPE REACTORS; FOCUSING; ION BEAM TARGETS; PLASMA FILAMENT; INSTABILITY; PLASMA INSTABILITY; TARGETS; THERMONUCLEAR REACTORS
Description/Abstract The electromagnetic filamentation instability is expected to occur in heavy ion beam fusion target chambers. For a converging beam, the instability is expected to be convective with group velocity V/sub g/ approaching the beam velocity V/sub b/ until the beam is approx. 10-50 cm from the target. The number of e-foldings N/sub ..gamma../ is estimated by integrating the local growth rate along the beam trajectory. For a cold beam, the result agrees with the initial value problem solution of Lee, et al. Detailed numerical solutions to the full dispersion region predict somewhat lower values for N/sub ..gamma../. Close to the target, v/sub g/ ..-->.. 0, and the instability is effectively nonconvective, with N/sub ..gamma../ proportional to the pulse length. If a realistic conductivity model is used (sigma approx. (Z/sub b//R)/sup 2/), the number of e-foldings in the nonconvective region is generally smaller than N/sub ..gamma../ in the convective region. Thus, any appreciable deterioration in beam quality is more likely to occur while the beam is in the convective region.
Country of PublicationUnited States
LanguageEnglish
FormatSize: Pages: 25
AvailabilityDep. NTIS, PC A02/MF A01.
System Entry Date2008 Sep 04

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