Measurements of ICRF (ion cyclotron range of frequencies) loading with a ridged waveguide coupler on PLT [electronic resource].
- Published
- Princeton, N.J. : Princeton University, 1987.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- Pages: 34 : digital, PDF file
- Additional Creators
- Princeton University and United States. Department of Energy. Office of Scientific and Technical Information
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- Summary
- An ICRF ridged waveguide coupler has been installed on PLT for measurements of plasma loading. The coupler was partially filled with TiO/sub 2/ dielectric in order to sufficiently lower the cutoff frequency and utilized a tapered ridge for improved matching. Vacuum field measurements indicated a single propagating mode in the coupler and emphasized the importance of considering the fringing fields at the mouth of the waveguide. Low power experiments were carried out at 72.6 and 95.0 MHz without any external impedance matching network. Plasma loading increased rapidly as the face of the coupler approached the plasma, and, at fixed position, increased with line-averaged plasma density. At the lower frequency, the reflection coefficient exhibited a minimum (<8%) at a particular coupler position. At both frequencies, measurements indicated efficient power coupling to the plasma. Magnetic probe signals showed evidence of dense eigenmodes suggesting excitation of the fast wave. 24 refs., 13 figs.
- Report Numbers
- E 1.99:pppl-2434
pppl-2434 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
11/01/1987.
"pppl-2434"
"DE88009347"
Colestock, P.L.; Hwang, D.Q.; Wilson, J.R.; Nagy, A.; Greene, G.J.; Fortgang, C.M.; Hosea, J.C. - Funding Information
- AC02-76CH03073
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