High sensitivity imaging Thomson scattering for low temperature plasma
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Author | |
Abstract |
A highly sensitive imaging Thomson scattering system was developed for low temperature (0.1-10 eV) plasma applications at the Pilot-PSI linear plasma generator. The essential parts of the diagnostic are a neodymium doped yttrium aluminum garnet laser operating at the second harmonic (532 nm), a laser beam line with a unique stray light suppression system and a detection branch consisting of a Littrow spectrometer equipped with an efficient detector based on a "Generation III" image intensifier combined with an intensified charged coupled device camera. The system is capable of measuring electron density and temperature profiles of a plasma column of 30 mm in diameter with a spatial resolution of 0.6 mm and an observational error of 3% in the electron density (n(e)) and 6% in the electron temperature (T-e) at n(e)=4 x 10(19) m(-3). This is achievable at an accumulated laser input energy of 11 J (from 30 laser pulses at 10 Hz repetition frequency). The stray light contribution is below 9 x 10(17) m(-3) in electron density equivalents by the application of a unique stray light suppression system. The amount of laser energy that is required for a n(e) and T-e measurement is 7 x 10(20)/n(e) J, which means that single shot measurements are possible for n(e)>2 x 10(21) m(-3). (C) 2008 American Institute of Physics. |
Year of Publication |
2008
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Journal |
Review of Scientific Instruments
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Volume |
79
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Number |
1
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Number of Pages |
8
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Date Published |
Jan
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Type of Article |
Article
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ISBN Number |
0034-6748
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Accession Number |
ISI:000252821800018
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URL | |
PId |
bf82a46b9fdf9002cb1c95346b322ef3
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Alternate Journal |
Rev. Sci. Instrum.
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Journal Article
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