Investigation of electromagnetic radiation from a straight high-current discharge

Anomalous resistance of plasmas in sub-critical electric fields

“…The effective collision frequency v & ^ = y s determining variations in the momentum of electrons when scattered by ion-acoustic oscillations with energy (1.1) is of the order 2m, (1.3) The plasma conductivity determined with allowance for expression (1.3), a = Up e /4n v s , coincides to within a factor of the order of unity with measured values for the conductivity of a currentcarrying plasma [9][10][11][12][13], in which there must be ion-acoustic instability. Estimates of the velocity pulsation amplitudes of the electron and ion plasma components and of the depth of the skin layer of a low-frequency electromagnetic wave of high amplitude also coincide with measured values [15][16][17].…”

“…V.A. Suprunenko has informed us that the expected density values were more than an order ofmagnitude less than those mentioned in Ref [9]…”

“…(a) The anomalous resistance of a plasma in sub-critical fields was first discovered in a straight-line discharge in hydrogen (Grom-1 apparatus) by Suprunenko et al [9] in 1959. They found a decrease in plasma conductivity with increasing electric field strength which could not be attributed to pair collisions (with increasing E the plasma temperature rises and the Coulomb collision frequency decreases, so that the plasma conductivity would also have to increase if it were determined by Coulomb collisions; the frequency of electron collisions with neutral particles was small comparediwith v exp = Up e / 47ro exp)-I n their experiments 4 (n o ~4X 10 14 cm" 3 , T e -1 0 eV, E = 1 -10 V/cm) they found that the section of the curve a(E) at E~E S (E >E b , but E « E c r ) levelled out to a plateau a=a M (see Fig.…”

Electron radiation in a plasma-magnetic-field boundary layer

“…The electric field component parallel to the plasma boundary satisfies the equation 6. (7) where is the dielectric permeability of the plasma, is the collision rate, .... is the Coulomb logarithm (assuming that . .…”