Bibliographic Citation
Document | |
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Title | Convective and nonconvective ion beam filamentation instabilities |
Creator/Author | Hubbard, R.F. |
Publication Date | 1980 Jan 01 |
OSTI Identifier | OSTI ID: 5507835 |
Report Number(s) | CONF-7910122-11 |
DOE Contract Number | AC08-79DP40101 |
Resource Type | Conference |
Specific Type | Technical Report |
Resource Relation | Conference: Heavy ion fusion workshop, Berkeley, CA, USA, 29 Oct 1979 |
Research Org | JAYCOR, Alexandria, VA (USA) |
Subject | 70 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 Publication | United States |
Language | English |
Format | Size: Pages: 25 |
Availability | Dep. NTIS, PC A02/MF A01. |
System Entry Date | 2008 Sep 04 |
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