11 research outputs found
Vacuum magnetic linear birefringence using pulsed fields: 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 k_\mathrm{CM}8 \times 10^{-21}^{-2}3\sigma$ confidence level
Towards a first observation of magneto-electric directional anisotropy and linear birefringence in gases
In this contribution to PSAS'2010 we report on recent progress on an
experiment aimed at measuring small optical directional anisotropies by
frequency metrology in a high finesse ring cavity. We focus on our first
experimental goal, the measurement of magneto-electric effects in gases. After
a review of the expected effects in our set-up, we present the apparatus and
the measurement procedure, showing that we already have the necessary
sensitivity to start novel experiments.Comment: Proceedings of PSAS'2010, to be published in Canadian Journal of
Physics, 2011 Ja
Magnetic Linear Birefringence Measurements Using Pulsed Fields
In this paper we present the realization of further steps towards the
measurement of the magnetic birefringence of the vacuum using pulsed fields.
After describing our experiment, we report the calibration of our apparatus
using nitrogen gas and we discuss the precision of our measurement giving a
detailed error budget. Our best present vacuum upper limit is Dn < 5.0x10^(-20)
T^-2 per 4 ms acquisition time. We finally discuss the improvements necessary
to reach our final goal.Comment: submitted to Phys. Rev.
A Photon Regeneration Experiment for Axionlike Particle Search using X-rays
In this letter we describe our novel photon regeneration experiment for the axionlike particle search using a x-ray beam with a photon energy of 50.2 keV 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