{'fraction_non_alphanumeric': 0.06666666666666667, 'fraction_numerical': 0.00425531914893617, 'mean_word_length': 4.8347107438016526, 'pattern_counts': {'":': 0, '<': 10, '<?xml version=': 0, '>': 9, '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}}
Simulation Analysis of Head-Tail Motion Caused by Electron Cloud

Synchro-beta side band signal caused by electron cloud instability has been observed at KEK-B factory. The side-band appears above the threshold of beam size blow-up and disappears by exciting solenoid magnets which covers whole ring. The side-band is an evidence of strong head-tail instability caused by electron cloud. The side-band appears in tune spectrum with positive shift ν<inf>β</inf>+ aν<inf>s</inf>(1 < a < 2), while general strong head-tail instability shows a negative shift ν<inf>β</inf>− aν<inf>s</inf>(a > 0). We study the synchro-beta spectrum using a code, PEHTS, which simulates single bunch electron cloud instability.