Ly-alpha polarimeter design for CLASP rocket experiment

摘要

A sounding-rocket program called the Chromospheric Lyman-AlphaSpectro-Polarimeter (CLASP) is proposed to be launched in the summer of 2014.CLASP will observe the solar chromosphere in Ly-alpha (121.567 nm), aiming todetect the linear polarization signal produced by scattering processes and theHanle effect for the first time. The polarimeter of CLASP consists of arotating half-waveplate, a beam splitter, and a polarization analyzer.Magnesium Fluoride (MgF2) is used for these optical components, because MgF2exhibits birefringent property and high transparency at ultraviolet wavelength.