{"paper":{"title":"ALMA Nutator Design and Preliminary Performance","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Academia Sinica, Arthur Symmes (b) ((a) Institute of Astronomy, Astrophysics, Chaoyang University of Technology, Chih-Wen Ni (c), Chin-Long Ong (e), Daya District, Green Bank, Inc., John Ford (b), Ming-Tang Chen (a), Patrick M. Koch (a), Paul T.P. Ho (a), Philippe Raffin (a), Pierre Martin-Cocher (a), Roosevelt Rd, Taichung, Taichung City, Taiwan), Taiwan. (b) National Radio Astronomy Observatory, Taiwan. (d) Department of Industrial Design, Taiwan. (e) COTECH, U.S.A. (c) Realscene Technology Corp, Wei-Long Chen (d), Wu Ci","submitted_at":"2013-07-20T07:57:55Z","abstract_excerpt":"We report the past two years of collaboration between the different actors on the ALMA nutator. Building on previous developments, the nutator has seen changes in much of the design. A high-modulus carbon fiber structure has been added on the back of the mirror in order to transfer the voice coils forces with less deformation, thus reducing delay problems due to flexing. The controller is now an off-the-shelf National Instrument NI-cRIO, and the amplifier a class D servo drive from Advanced Motion Controls, with high peak power able to drive the coils at 300 Volts DC. The stow mechanism has be"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5387","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}