| Autor: |
Wang, Tao, Kimball, Derek F. Jackson, Sushkov, Alexander O., Aybas, Deniz, Blanchard, John W., Centers, Gary, Kelley, Sean R. O’, Wickenbrock, Arne, Fang, Jiancheng, Budker, Dmitry |
| Zdroj: |
Physics of the Dark Universe; Mar2018, Vol. 19, p27-35, 9p |
| Abstrakt: |
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 ≈ 1 fT ∕ Hz and an effective sensing volume of 0.1 cm 3 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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