Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-01-13
Lect.Notes.Phys.741:135-156,2008
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, prepared for the Lecture Notes on Physics (Springer Verlag) volume on Axions, edited by M. Kuster
Scientific paper
This chapter will cover the search for dark matter axions based on microwave cavity experiments proposed by Pierre Sikivie. The topic begins 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 as well as 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 to be 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 section will conclude with a discussion of future plans and challenges for the microwave cavity experiment.
Bibber Karl van
Carosi Gianpaolo
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