Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8141829 | Physics of the Dark Universe | 2018 | 9 Pages |
Abstract
The Cosmic Axion Spin Precession Experiment (CASPEr) seeks to measure oscillating torques on nuclear spins caused by axion or axion-like-particle (ALP) dark matter via nuclear magnetic resonance (NMR) techniques. A sample spin-polarized along a leading magnetic field experiences a resonance when the Larmor frequency matches the axion/ALP Compton frequency, generating precessing transverse nuclear magnetization. Here we demonstrate a Spin-Exchange Relaxation-Free (SERF) magnetometer with sensitivity â1fTâHz and an effective sensing volume of 0.1 cm3 that may be useful for NMR detection in CASPEr. A potential drawback of SERF-magnetometer-based NMR detection is the SERF's limited dynamic range. Use of a magnetic flux transformer to suppress the leading magnetic field is considered as a potential method to expand the SERF's dynamic range in order to probe higher axion/ALP Compton frequencies.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Tao Wang, Derek F. Jackson Kimball, Alexander O. Sushkov, Deniz Aybas, John W. Blanchard, Gary Centers, Sean R. O' Kelley, Arne Wickenbrock, Jiancheng Fang, Dmitry Budker,