Low-frequency wave excitation by weak nonlinear interaction of two high-frequency pump waves: part II-experiments
This paper presents an experimental study of the characteristics of the LF wave excited in a hot magnetized plasma column by weak nonlinear interaction of two HF pump waves. These experimental features are systematically compared with theoretical ones which have been established in a previous theoretical paper.
Paramagnetic coupling between electron and ion waves in a self resonant plasma
Experimental results in a low-pressure r.f. self-sustained plasma discharge are discussed. A parametric coupling between several electronic modes with different azimuthal wavenumbers and an ionic mode explain one of the emissions with frequency close to the ionic plasma frequency. This oscillation is also observed when the exciting frequency lies close to the thermal Tonks-Dattner resonances (secondary resonances) frequencies in a low pressure glow discharge; in this case, by reducing the microwave pump power below the threshold required for the instability, a c.w. input signal whose frequency is in the vicinity of one of the parametric resonances, is amplified when this signal is excited with an azimuthal wavenumber differing from the exciting one.
Normalisation of the (t, d) reaction
Abstract From a study of the 208 Pb(t, d) 209 Pb reaction at E t = 8.85 MeV, the coefficient required to normalise the zero range DWBA cross section for the (t, d) reaction is determined to be (5.60 ± 0.65) × 10 4 MeV 2 fm 3 .