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.
Asztalos
S J
SJ
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Carosi
G
G
Hagmann
C
C
Kinion
D
D
van Bibber
K
K
Hotz
M
M
Rosenberg
L J
LJ
Rybka
G
G
Hoskins
J
J
Hwang
J
J
Sikivie
P
P
Tanner
D B
DB
Bradley
R
R
Clarke
J
J