{'fraction_non_alphanumeric': 0.017543859649122806, 'fraction_numerical': 0.0, 'mean_word_length': 4.980952380952381, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Influence of particle distribution function on plasma expansion into vacuum

Influence of velocity distribution of plasma particles in its expansion into the vacuum is studied. For this purpose, the one-dimensional Vlasov-Poisson system of equations is solved in planner geometry for both electrons and ions. Real value of electron-to-ion mass ratio is considered and electron and ion temperatures are assumed to be equal. It is shown that, a part of the initial internal energy is devoted to the particle arrangement in the velocity space and therefore, the expansion rate and the electric field of charge separation decrease.