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  An integrated system to measure the effective charge of fusion plasmas in the ASDEX Upgrade tokamak

Meister, H., Dux, R., Horton, L. D., Kurzan, B., McCarthy, P. J., Zohm, H., et al. (2003). An integrated system to measure the effective charge of fusion plasmas in the ASDEX Upgrade tokamak. Review of Scientific Instruments, 74, 4625-4633. doi:10.1063/1.1605265.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-3C6D-E Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-3C6E-C
Genre: Journal Article

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 Creators:
Meister, H.1, Author           
Dux, R.2, Author           
Horton, L. D.3, Author           
Kurzan, B.1, Author           
McCarthy, P. J.4, Author           
Zohm, H.1, Author           
ASDEX Upgrade Team5, Author
Affiliations:
1Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
2Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
3Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
4Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
5Department of Physics, University College Cork, Association EURATOM-DCU, Cork, Ireland, ou_persistent22              

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 Abstract: At the ASDEX Upgrade tokamak a new approach has been developed to determine the profiles of the effective charge (Zeff) from bremsstrahlung emission in hot fusion plasmas. The signals of all diagnostics measuring bremsstrahlung have been incorporated into one evaluation algorithm, resulting in the possibility to check whether or not signals are disturbed during each discharge. Especially helpful to this aim is a recently installed diagnostic measuring the bremsstrahlung spectrally resolved by using a spectrometer and a charge-coupled-device (CCD) camera as a detector. The experimental results are verified qualitatively and quantitatively using a discharge with silicon laser blow-off. Modeling of the bremsstrahlung as measured with the CCD camera using the routines and data of the ADAS package reveals that the background of the spectra is dominated by bremsstrahlung for most sight lines. Only those passing mainly outside the last closed flux surface measure a considerable amount of line and molecular band radiation. This edge emission can be considered as a radiative mantle. Subtracting it from all other signals results in reduced statistical errors of the deduced Zeff profiles while not changing the profile shape inside a normalized minor radius of 0.8.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 60370
DOI: 10.1063/1.1605265
 Degree: -

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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sc. Instrum.
Source Genre: Journal
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Publ. Info: ©2003 American Institute of Physics
Pages: - Volume / Issue: 74 Sequence Number: - Start / End Page: 4625 - 4633 Identifier: -