{"paper":{"title":"Cryogenic Sapphire Oscillator using a low-vibration design pulse-tube cryocooler: First results","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Chao Wang, Jean-Michel le Floch, John G. Hartnett, Nitin R. Nand","submitted_at":"2010-04-04T06:35:17Z","abstract_excerpt":"A Cryogenic Sapphire Oscillator has been implemented at 11.2 GHz using a low-vibration design pulse-tube cryocooler.  Compared with a state-of-the-art liquid helium cooled CSO in the same laboratory, the square root Allan variance of their combined fractional frequency instability is $\\sigma_y = 1.4 \\times  10^{-15}\\tau^{-1/2}$ for integration times $1 < \\tau < 10$ s, dominated by white frequency noise. The minimum $\\sigma_y = 5.3 \\times 10^{-16}$ for the two oscillators was reached at $\\tau = 20$ s. Assuming equal contributions from both CSOs, the single oscillator phase noise $S_{\\phi} \\appr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.0488","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"}