Ly-alpha polarimeter design for CLASP rocket experiment
H. Watanabe, N. Narukage, M. Kubo, R. Ishikawa, T. Bando, R. Kano, S., Tsuneta, K. Kobayashi, K. Ichimoto, J. Trujillo-Bueno
TL;DR
The paper presents the design of a Ly-alpha polarimeter for the CLASP rocket experiment, aiming to measure solar chromosphere polarization signals in ultraviolet light for the first time.
Contribution
It introduces a novel polarimeter design using MgF2 optical components optimized for ultraviolet Ly-alpha observations in a sounding-rocket experiment.
Findings
Design specifications for the polarimeter are established.
Optical components using MgF2 are suitable for ultraviolet polarization measurements.
The system aims to detect scattering and Hanle effect signals in the solar chromosphere.
Abstract
A sounding-rocket program called the Chromospheric Lyman-Alpha Spectro-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 to detect the linear polarization signal produced by scattering processes and the Hanle effect for the first time. The polarimeter of CLASP consists of a rotating half-waveplate, a beam splitter, and a polarization analyzer. Magnesium Fluoride (MgF2) is used for these optical components, because MgF2 exhibits birefringent property and high transparency at ultraviolet wavelength.
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