Abstract
The penetration of low frequency sound wave into the fuel deuterium is discussed as for laser fusion. The sound velocity and the attenuation constant due to viscosity are calculated for high density (n=1024-1027 cm-3, T=10-1-104 eV) deuterium. The shear viscosity of free electron gas and the bulk viscosity due to ion-ion interaction mainly contribute to the attenuation of sound wave. The sound wave of the frequency below 1010Hz can easily penetrate through the compressed fuel deuterium of diameter 1-103μm
