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Source mass characterization in the ARIADNE axion experiment

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arxiv 2011.10141 v1 pith:AISTCWI5 submitted 2020-11-19 physics.ins-det hep-ex

Source mass characterization in the ARIADNE axion experiment

classification physics.ins-det hep-ex
keywords noiseaxionmagneticsourceexperimentmassariadnecharacterization
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Axion Resonant InterAction Detection Experiment (ARIADNE) is a collaborative effort to search for the QCD axion using nuclear magnetic resonance (NMR), where the axion acts as a mediator of spin-dependent forces between an unpolarized tungsten source mass and a sample of polarized helium-3 gas. Since the experiment involves precision measurement of a small magnetization, it relies on limiting ordinary magnetic noise with superconducting magnetic shielding. In addition to the shielding, proper characterization of the noise level from other sources is crucial. We investigate one such noise source in detail: the magnetic noise due to impurities and Johnson noise in the tungsten source mass.

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