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  Dynamic laser alignment control for Thomson scattering on ASDEX Upgrade

Murmann, H., Jakobi, M., Kurzan, B., & Schilling, H. B. (2003). Dynamic laser alignment control for Thomson scattering on ASDEX Upgrade. Review of Scientific Instruments, 74, 4310-4313. doi:10.1063/1.1612000.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3C6B-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3C6C-0
Genre: Journal Article

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 Creators:
Murmann, H.1, Author              
Jakobi, M.2, Author              
Kurzan, B.2, Author              
Schilling, H. B.3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
3Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              

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 Abstract: Thomson scattering, as a very direct diagnostic method to measure electron density ne and temperature Te of a plasma, has become a standard tool in plasma physics. Reliable Nd:YAG lasers have been developed for industrial applications, the accuracy of scattering measurements is sufficiently high to measure profile gradients of Te and ne with millimeter spatial resolution down to electron densities of 1018 m–3 with reasonable error bars. As the accuracy of the measurement increased steadily, a new category of errors has been revealed, which is not very likely to be detected when only one laser is used. Inhomogeneities of the scattered power density within the entrance slit of a polychromator cause systematic errors, thus the precise alignment of the scattering lasers is critical. Such an alignment is now continuously maintained during diagnostic operation by a new closed-loop control system implemented with a simple and effective optoelectronic balance technique.

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 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 60368
DOI: 10.1063/1.1612000
 Degree: -

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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sc. Instrum.
Source Genre: Journal
 Creator(s):
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Publ. Info: ©2003 American Institute of Physics
Pages: - Volume / Issue: 74 Sequence Number: - Start / End Page: 4310 - 4313 Identifier: -