Paul Berceau

Photon regeneration experiment for axion search using x-rays.

In this Letter we describe our novel photon regeneration experiment for the axionlike particle search using an x-ray beam with a photon energy of 50.2 and 90.7 keV, two superconducting magnets of 3 T, and a Ge detector with a high quantum efficiency. A counting rate of regenerated photons compatible with zero has been measured. The corresponding limits on the pseudoscalar axionlike particle-two-photon coupling constant is obtained as a function of the particle mass. Our setup widens the energy window of purely terrestrial experiments devoted to the axionlike particle search by coupling to two photons. It also opens a new domain of experimental investigation of photon propagation in magnetic fields.

Vacuum magnetic linear birefringence using pulsed fields: status of the BMV experiment

We present the current status of the BMV experiment. Our apparatus is based on an up-to-date resonant optical cavity coupled to a transverse magnetic field. We detail our data acquisition and analysis procedure which takes into account the symmetry properties of the raw data with respect to the orientation of the magnetic field and the sign of the cavity birefringence. The measurement result of the vacuum magnetic linear birefringence kCM presented in this paper was obtained with about 200 magnetic pulses and a maximum field of 6.5 T, giving a noise floor of about 8 × 10-21 T-2 at 3σ confidence level.

Magnetic linear birefringence measurements using pulsed fields

In this paper we present the realization of further steps toward the measurement of the magnetic birefringence of a vacuum using pulsed fields. After describing our experiment, we report the calibration of our apparatus using nitrogen gas and discuss the precision of our measurement giving a detailed error budget. Our best present vacuum upper limit is

Vacuum magnetic linear birefringence using pulsed fields: the BMV experiment

\ensuremath{\Delta}n\phantom{\rule{0.16em}{0ex}}\ensuremath{\leqslant}\phantom{\rule{0.16em}{0ex}}5.0\phantom{\rule{0.16em}{0ex}}\ifmmode\times\else\texttimes\fi{}\phantom{\rule{0.16em}{0ex}}{10}^{\ensuremath{-}20}

Faraday and Cotton-Mouton Effects of Helium at

T

\lambda = 1064

{}^{\ensuremath{-}2}

nm

per 4 ms acquisition time. We finally discuss the improvements necessary to reach our final goal.

Dynamical behaviour of birefringent Fabry–Perot cavities

We present the current status of the BMV experiment. Our apparatus is based on an up-to-date resonant optical cavity coupled to a transverse magnetic field. We detail our data acquisition and analysis procedure which takes into account the symmetry properties of the raw data with respect to the orientation of the magnetic field and the sign of the cavity birefringence. The measurement result of the vacuum magnetic linear birefringence kCM presented in this paper was obtained with about 200 magnetic pulses and a maximum field of 6.5 T, giving a noise floor of about 8 × 10-21 T-2 at 3σ confidence level.

The vacuum magnetic birefringence experiment: a test for quantum electrodynamics 1

We present measurements of the Faraday and the Cotton-Mouton effects of helium gas at

Vacuum magnetic birefringence

\lambda~=~1064