{'fraction_non_alphanumeric': 0.024958402662229616, 'fraction_numerical': 0.0066555740432612314, 'mean_word_length': 4.955445544554456, '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}}
Lobster-eye x-ray telescope prototype

Wide field x-ray telescopes based upon the 'lobster eye' geometry can play an important role in future astronomical investigations. Our approach is based upon the geometry of Schmidt, 1975 in which a telescope is composed of two similar orthogonal stacks, each made from equally spaced identical flats that reflect on both faces. Its advantages are compatibility with large aperture and large field of view. Construction of a mirror reduces to two tasks, (1) mass producing thin, smooth, two sided flats and (2) securing them along two edges by a method that preserves their flatness. We are investigating both tasks in parallel. To address the first problem we are attempting to improve the flatness and reflectivity of an inexpensive, thin, commercial glass by replicating a smoother, flatter, gold coated surface on both faces. To address the second task, a small, 1D mirror assembly covering a 5 degree field of view was constructed from inexpensive, thin commercial glass that was coated on two sides with nickel. X-ray testing indicated that its resolution was consistent with theory and the approximately two arcminute deviation from flatness of the glass.