Energy storage in metal devices and the advantages of liquid hydrogen temperatures

Abstract

Peculiarities of low temperature charge transport and energy accumulation in aluminum devices are investigated by means of study of cylindrical conductors having a radial current flow between inner and outer concentric contracts. Azimuthal current and, connectedwith it, self magnetic field are investigated in a wide range of radial current density up to 6000 A/cm^2 under an external magnetic field up to 8 T. Electron scattering processes are investigated and it is shown that relaxation electron mechanisms are determined by strong temperature dependence on account of high susceptibility of scattering to anisotropy of electron dispersion law. The role of thermal phonons is investigated through an effective averaged conductivity tensor of polycrystal line medium. Using data of self magnetic self distribution on sample surface an energy density of self magnetic field is estimated. It is shown that at T=4.2 К average energy of self field may achieve at least 1 J/cm^3. Using data of relaxation processes at temperature of liquid hydrogen it is established that self magnetic field must be a third of helium magnitude with respective self magnetic energy density, spiral motion of carriers in this geometry being regarded as a current coils in usual inductive element.