arXiv subjects

Jeah-Sheng Wu

Publications and source records attributed to Jeah-Sheng Wu.

2 recordsLinked to original sources

arXiv2003

Improving ellipticity detection sensitivity for the Q & A vacuum birefringence experiment

Q & A (quantum electrodynamics test and search for axion) experiment was first proposed in 1994 and a 3.5 m high-finesse Fabry-Perot prototype detector extendable to 7 m has been built and tested. We now enter into the 2nd phase of improving the ellipticity detection sensitivity. We present our scheme, compare with other ongoing experiments, analyze the displacement spectra of our suspension system, and use them for designing automatic alignment control to improve the ellipticicy detection sensitivity. To improve ellipsometry resolution, we use new polarizers of extinction ratio smaller than 10^{-8}.

hep-ex↗

arXiv2003

Building a 3.5 m prototype interferometer for the Q & A vacuum birefringence experiment and high precision ellipsometry

We have built and tested a 3.5 m high-finesse Fabry-Perot prototype inteferometer with a precision ellipsometer for the QED test and axion search (Q & A) experiment. We use X-pendulum-double-pendulum suspension designs and automatic control schemes developed by the gravitational-wave detection community. Verdet constant and Cotton-Mouton constant of the air are measured as a test. Double modulation with polarization modulation 100 Hz and magnetic-field modulation 0.05 Hz gives 10^{-7} rad phase noise for a 44-minute integration.

physics.ins-det↗