The investigation of the fast electrons energy distribution in the positive column and negative glow of the low pressure helium discharge

The variation in the rapid electron energy distribution function vs the location of the observation point in a low-pressure discharge in helium is investigated. The helium pressures were 2.5 * $10^{-2}$,5 * $10^{-2}$, 0.3 and 0.1 mm Hg, $i_{dis}$ = 25 mA. The distribution function was calculated from dis measured spectral line intensities by solving the invesrse problem using the regularization method.