A plasma source is described, which produces a fully ionized, collision-free and magnetized initial plasma with a low content of contaminations and good homogeneity in linear geometry. The plasma is subjected to a high frequency field with frequencies near 2 ωci. Measurements show that the external field is coupled effectively to the compressional wave which transfers its energy to the plasma by some collisionless dissipation mechanism. The observed phenomenon show no resonance at multiples of the ion cyclotron frequency and the temperature is higher than expected from direct resonance of the particles at ω=2ωci; it is assumed that turbulent effects are responsible which are excited by electron-ion drifts smaller than the thermal velocity of the ions.