D. Kinion

SQUID-Based Microwave Cavity Search for Dark-Matter Axions

Axions in the microeV mass range are a plausible cold dark-matter candidate and may be detected by their conversion into microwave photons in a resonant cavity immersed in a static magnetic field. We report the first result from such an axion search using a superconducting first-stage amplifier (SQUID) replacing a conventional GaAs field-effect transistor amplifier. This experiment excludes KSVZ dark-matter axions with masses between 3.3 microeV and 3.53 microeV and sets the stage for a definitive axion search utilizing near quantum-limited SQUID amplifiers.

High resolution search for dark-matter axions

We have performed a high resolution search for galactic halo axions in cold flows using a microwave cavity detector. The analysis procedure and other details of this search are described. No axion signal was found in the mass range 1.98-2.17 micro-eV. We place upper limits on the density of axions in local discrete flows based on this result.

An Improved RF Cavity Search for Halo Axions

The axion is a hypothetical elementary particle and cold dark matter candidate. In this RF cavity experiment, halo axions entering a resonant cavity immersed in a static magnetic field convert into microwave photons, with the resulting photons detected by a low-noise receiver. The ADMX Collaboration presents new limits on the axion-to-photon coupling and local axion dark matter halo mass density from a RF cavity axion search in the axion mass range 1.9-2.3 {micro}eV, broadening the search range to 1.9-3.3 {micro}eV. In addition, we report first results from an improved analysis technique.

Results from a High-Sensitivity Search for Cosmic Axions

We report the first results of a high-sensitivity

Experimental Constraints on the Axion Dark Matter Halo Density

(\ensuremath{\sim}{10}^{\ensuremath{-}23}\mathrm{W})

Search for Hidden Sector Photons with the ADMX Detector

search for light halo axions through their conversion to microwave photons. At the 90% confidence level, we exclude a Kim-Shifman-Vainshtein-Zakharov axion of mass

Search for nonvirialized axionic dark matter

2.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}

Results of a Search for Cold Flows of Dark Matter Axions

to

Design and performance of the ADMX SQUID-based microwave receiver

3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}\mathrm{eV}

Search for Chameleon Scalar Fields with the Axion Dark Matter Experiment

as the dark matter in the halo of our galaxy.