Center for Axion and Precision Physics Research
CAPP's Laser Research Image in The Korea Economic Daily (November 9, 2015)
Title : Optical setup for eddy current B field measurement in the Kicker
Author : Mr. Seung-Pyo Chang (Graduate student), Mr. Doyu Lee (Graduate student), Dr. Young-Im Kim (Research fellow)
Description : This picture is the
photograph of optical setup for eddy current B field measurement in the kicker
which does important role in the muon g-2 experiment. This setup is based on
the Faraday effect. The Faraday effect is magneto optical phenomenon which is
about the interaction between the magnetic field and the polarized light. The
magnetic field can be measured by measuring the rotated angle of polarized
light. The 633 nm wavelength laser beam goes through the Galilean Telescope.
Then it goes through the polarizer and two lenses which are for polarizing and controlling
the beam size respectively. After the two lenses, the beam goes into the TGG (Terbium
Gallium Garnet) crystal which is in the magnetic field we want to measure. The
beam is reflected at the mirror behind the TGG crystal. Finally it arrives at
the detector after another polarizer.