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Talk
Title	Cavity Microwave Searches for Cosmological Axions
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Author(s)	Karl van Bibber (speaker) (LLNL)
Corporate author(s)	CERN. Geneva
Imprint	2005-12-02. - Streaming video, 01:38:40:00.
Series	(Special Lecture Series) (1<sup>st</sup> Joint ILIAS-CAST-CERN Axion Training)
Lecture note	on 2005-12-02T09:00:00
Subject category	Special Lecture Series
Abstract	Outline of the lecture: The lecture will cover the searches for dark matter axions based on the microwave cavity experiment of Sikivie. The topics will begin with a brief overview of halo dark matter, and the axion as a candidate. The principle of resonant conversion of axions in an external magnetic field will be described, and practical considerations in optimizing the experiment as a signal-to-noise problem. A major focus of the lecture will be the two complementary strategies for ultra-low noise detection of the microwave photons - the "photon-as-wave" approach (i.e. conventional heterojunction amplifiers and soon quantum-limited SQUID devices), and "photon-as-particle" (i.e. Rydberg-atom single-quantum detection). Experimental results will be presented; these experiments have already reached well into the range of sensitivity to exclude plausible axion models, for limited ranges of mass. The lecture will conclude with a discussion of future plans and challenges for the microwave cavity experiment.
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