{'fraction_non_alphanumeric': 0.047619047619047616, 'fraction_numerical': 0.00744047619047619, 'mean_word_length': 4.299212598425197, 'pattern_counts': {'":': 0, '<': 1, '<?xml version=': 0, '>': 1, '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}}
Modulational instability and its consequences for the beat-wave accelerator.

The modulational instability caused by the coupling of a Langmuir wave to the ion motion is investigated in the domain of large v/sub L//V/sub te/>1 ratios, where v/sub L/ and v/sub t//sub e/ denote the pump Langmuir-wave quiver velocity and the electron thermal velocity, respectively. A convenient approximate expression for the growth rate is given for v/sub L//v/sub te/<50(A/Z)/sup 1/6/. The limitation of the beat plasmon growth due to the modulational instability is studied in the context of plasma beat wave experiments and the maximum beat plasmon amplitude is determined numerically.