Electrostatic ion cyclotron waves in a low magnetized plasma

Abstract

AbStiiCt-Elect~ostatic wave propagation transverse to a magnetic field B is analyzed in the range of the ion cyclotron frequency in a toroidal device. The clmtrostatic ion cyclotron waves are excited by means of an electromagnetic signal injected through an antenna system located in the centre of the plasma. For the first time the backward mode is detected in hydrogen and deuterium plasmas. A comparison between the theoretical dispersion relation and the experimental results permits an indirect accurate estimate of the ion temperature, typically in the range 0.054.3 eV.

RF-induced electric field and transport: experiments in non-fusion plasmas

“…For Thorello plasma conditions, the damping rate can be evaluated by considering the charge exchange rate σ cx v th = 2.6 × 10 −9 cm 3 s −1 for an ion temperature of 0.1 eV, and estimating the neutral density by measuring the neutral gas pressure P r . The dRS/dr and the damping term −µ v θ have been plotted for a given neutral gas pressure P r = 1.5 × 10 −4 mbar, for which µ = 3.8 × 10 4 s −1 [21] (T i = 0.1 eV) in figure 8. The order of magnitude of the two terms is similar, as well as the trend of their radial profiles.…”

Electrostatic ion-Bernstein waves in the Blaamann device

“…Attempts to find these waves and, in particular, the NIBW, in neon and argon plasmas were not successful. Alba er al [14], who made theoretical predictions for plasma parameters similar to those obtainable in Blaamann. argues that the backward NIBW mode is only detectable in hydrogen and deuterium.…”

Plasma diagnostic through ion bernstein waves

“…In the range of parallel k,, wave vector values between t]d/vt~ and D~i/vti, the dispersion relation describes Neutralised Ion Bernstein Waves [1,2] (NIBW); these are characterised by two different branches having propagatory nature, the backward and the forward modes, as shown in fig. 1.…”