AXION SEARCH WITH Q & A EXPERIMENT

作者：Mei Hsien Hao^*; Ni Wei Tou; Chen Sheng Jui; Pan Sheau Shi

来源：Modern Physics Letters A, 2010, 25(11-12): 983-993.

DOI：10.1142/S0217732310000149

• Dark matter
• pseudoscalar-photon interaction
• axion
• vacuum dichroism
• vacuum birefringence
• Q &amp
• A experiment

Dark matter is a focused issue in galactic evolution and cosmology. Axion is a viable particle candidate for dark matter. Its interaction with photon is an effective way to detect it, e.g., pseudoscalar-photon interaction will generate vacuum dichroism in a magnetic field. Motivated to measure the QED vacuum birefringence and to detect pseudoscalar-photon interaction, we started to build up the Q & A experiment (QED [Quantum Electrodynamics] and Axion experiment) in 1994. In this talk, we first give a brief historical account of planet hunting and dark matter evidence. We then review our 3.5 m Fabry-Perot interferometer together with our results of measuring vacuum dichroism and gaseousCotton-Moutoneffects.Our first results give (-0.2 +/- 2.8) x 10(-13) rad/pass, at 2.3 T with 18,700 passes through a 0.6 m long magnet, for vacuum dichroism measurement. We are upgrading our interferometer to 7m arm-length with a new 1.8 m 2.3 T permanent magnet capable of rotation upto 13 cycles per second. We aim at 10 nrad/root Hz optical sensitivity with 532 nm cavity finesse around 100,000. When achieved, vacuum dichroism would be measured to 8.6 x 10(-1)7 rad/pass in about 50 days, and QED birefringence would be measured to 28%.

• 出版日期2010-4-20
• 单位清华大学