Polarization spectroscopy of x-ray transitions from beam-excited highly charged ions
作者:
P. Beiersdorfer,
J. Crespo Lo´pez-Urrutia,
V. Decaux,
K. Widmann,
P. Neill,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 1
页码: 1073-1076
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148222
出版商: AIP
数据来源: AIP
摘要:
Polarization spectroscopy of x-ray lines represents a diagnostic tool to ascertain the presence of electron beams in high-temperature plasmas. Making use of the Livermore electron beam ion trap, which optimizes the linear x-ray line polarization by exciting highly charged ions with a monoenergetic electron beam, we have begun to develop polarization diagnostics and test theoretical models. Our measurement relies on the sensitivity of crystal spectrometers to the linear polarization of x-ray lines which depends on the value of the Bragg angle. We employed two spectrometers with differing analyzing crystals and simultaneously recorded theK-shell emission from heliumlike Fe24+and lithiumlike Fe23+ions at two different Bragg angles. A clear difference in the relative intensities of the dominant transitions is observed, which is attributed to the amount of linear polarization of the individual lines. ©1997 American Institute of Physics.
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