TY - JOUR
T1 - Galactic Axions search with a superconducting resonant cavity
AU - Alesini, D
AU - Speake, Clive
PY - 2019/5/1
Y1 - 2019/5/1
N2 - To account for the dark-matter content in our Universe, postinflationary scenarios predict for the QCD
axion a mass in the range ð10–103Þ μeV. Searches with haloscope experiments in this mass range require
the monitoring of resonant cavity modes with frequency above 5 GHz, where several experimental
limitations occur due to linear amplifiers, small volumes, and low quality factors of copper resonant
cavities. In this paper, we deal with the last issue, presenting the result of a search for galactic axions using a
haloscope based on a 36 cm3 NbTi superconducting cavity. The cavity worked at T ¼ 4 K in a 2 T
magnetic field and exhibited a quality factor Q0 ¼ 4.5 × 105 for the TM010 mode at 9 GHz. With such
values of Q, the axion signal is significantly increased with respect to copper cavity haloscopes. Operating
this setup, we set the limit gaγγ < 1.03 × 10−12 GeV−1 on the axion photon coupling for a mass of about
37 μeV. A comprehensive study of the NbTi cavity at different magnetic fields, temperatures, and
frequencies is also presented.
AB - To account for the dark-matter content in our Universe, postinflationary scenarios predict for the QCD
axion a mass in the range ð10–103Þ μeV. Searches with haloscope experiments in this mass range require
the monitoring of resonant cavity modes with frequency above 5 GHz, where several experimental
limitations occur due to linear amplifiers, small volumes, and low quality factors of copper resonant
cavities. In this paper, we deal with the last issue, presenting the result of a search for galactic axions using a
haloscope based on a 36 cm3 NbTi superconducting cavity. The cavity worked at T ¼ 4 K in a 2 T
magnetic field and exhibited a quality factor Q0 ¼ 4.5 × 105 for the TM010 mode at 9 GHz. With such
values of Q, the axion signal is significantly increased with respect to copper cavity haloscopes. Operating
this setup, we set the limit gaγγ < 1.03 × 10−12 GeV−1 on the axion photon coupling for a mass of about
37 μeV. A comprehensive study of the NbTi cavity at different magnetic fields, temperatures, and
frequencies is also presented.
UR - https://arxiv.org/abs/1903.06547
U2 - 10.1103/PhysRevD.99.101101
DO - 10.1103/PhysRevD.99.101101
M3 - Article
SN - 1550-7998
VL - 99
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 10
M1 - 101101(R)
ER -