Characteristics of a multilayer mirror polarimeter for measurements at extreme ultraviolet wavelengths : Proceedings of the eleventh topical conference on high temperature plasma diagnostics
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1089-7623
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
Electrical Engineering, Measurement and Control Technology
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| Notes: |
We have developed and tested a multilayer mirror (MLM) polarimeter optimized for λ=304 Å using electron impact on helium. Specifically we present the first experimental results of the polarization of the extreme ultraviolet Lyman-α emission from He+ [He II (2p)2P°→(1s)2S] as a function of the electron impact energy for impact energies ranging from 150 to 980 eV. A major challenge to performing this measurement is the suppression of the dominant He I (1snp)1P°→(1s2)1S radiation originating from the excitation of helium. Excellent spectral selectivity has been achieved with a VYNS copolymer filter whose transmission ratio of He II to He I emission has been measured to be greater than 1200:1. Additionally, we have measured the instrumental polarization using two identical MLMs in a crossed polarizer configuration. © 1997 American Institute of Physics.
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| Type of Medium: |
Electronic Resource
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| URL: |