Development of high-order harmonic light spectrometer for observation of strong magnetic field generated by fast electrons in laser-plasma interactions

Measurement of magnetic field is one of critical parameters for Fast ignition in inertial confinement fusion research. Not only that the field inside plasma affects the transport of fast electrons generated in intense laser pulse-plasma interactions, but also that measurement of the field is one of good tools for investigation the current of fast electrons, resulting in estimation of conversion efficiency from laser light to nuclear energy. In order to measure the magnetic field, we developed a 2-dimensional and VUV spectrometers to measure sideband of high-order harmonics created via cyclotron motion of bulk electrons. The preliminary experimental results will be also discussed. (author)