{"paper":{"title":"Pointing control for the SPIDER balloon-borne telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Alexandra S. Rahlin, Alexis C. Weber, Amy Trangsrud, Anne E. Gambrel, Anthony D. Turner, Aurelien A. Fraisse, Brendan P. Crill, Carl D. Reintsema, Carlo R. Contaldi, Carole E. Tucker, Carolyn J. MacTavish, C. Barth Netterfield, Chao-Lin Kuo, Donald V. Wiebe, Edward Y. Young, Gene C. Hilton, H. Cynthia Chiang, Jamie J. Bock, Jamil A. Shariff, Jeffrey P. Filippini, Johanna M. Nagy, John E. Ruhl, Jon E. Gudmundsson, J. Richard Bond, Juan D. Soler, Kent D. Irwin, Krikor G. Megerian, Laura M. Fissel, Lorenzo Moncelsi, Mandana Amiri, Marcus C. Runyan, Mark Halpern, Marzieh Farhang, Matthew Hasselfield, Natalie N. Gandilo, Olivier P. Dor\\'e, Peter A. R. Ade, Peter V. Mason, Rebecca S. Tucker, Roger O'Brient, Sean A. Bryan, Steven J. Benton, Sunil R. Golwala, Tracy A. Morford, Viktor V. Hristov, Warren A. Holmes, William C. Jones, Zigmund D. Kermish","submitted_at":"2014-07-07T20:55:02Z","abstract_excerpt":"We present the technology and control methods developed for the pointing system of the SPIDER experiment. SPIDER is a balloon-borne polarimeter designed to detect the imprint of primordial gravitational waves in the polarization of the Cosmic Microwave Background radiation. We describe the two main components of the telescope's azimuth drive: the reaction wheel and the motorized pivot. A 13 kHz PI control loop runs on a digital signal processor, with feedback from fibre optic rate gyroscopes. This system can control azimuthal speed with < 0.02 deg/s RMS error. To control elevation, SPIDER uses"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1880","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"}