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  ECRH power deposition studies in ASDEX Upgrade

Kirov, K. K., Leuterer, F., Pereverzev, G. V., Ryter, F., & Suttrop, W. (2002). ECRH power deposition studies in ASDEX Upgrade. Plasma Physics and Controlled Fusion, 44, 2583-2602.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-4205-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-4206-0
Genre: Journal Article

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 Creators:
Kirov, K. K.1, 2, Author              
Leuterer, F.3, Author              
Pereverzev, G. V.4, Author              
Ryter, F.5, Author              
Suttrop, W.2, Author              
Affiliations:
1Tokamak: Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856308              
2Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
3Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
4Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
5Tokamak Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856308              

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 Abstract: In this paper the calculated ECRH power deposition profiles pECRH(rho) are compared with the experimentally derived ones in ASDEX Upgrade. ECRH power deposition is calculated by the beamtracing code and with its help the pECRH(rho) behaviour at different ECRH scenarios is investigated. Experimentally, power deposition can be obtained from electron temperature differences dT(e) after switching on/off ECRH or from the perturbed electron temperature (T) over tilde (e) when modulated ECRH is applied. The complete experimental recovery of the pECRH(rho) requires the determination of its maximum, centre rho(0) and width w(0). The centre of the deposition rho(0) is determined experimentally from the temperature response, from dT(e) after switching on/off ECRH or alternatively from (T) over tilde (e) in modulated ECRH experiments. The measured width is broadened quickly by perpendicular heat transport, which makes the experimental determination of w(0) very difficult. A scheme in which off- axis cw ECRH is applied in order to reduce the transport in the core plasma, where the modulated ECRH is deposited, is used in the determination of w(0). We estimate the ECRH deposition width w(0) in an indirect way, in which (T) over tilde (e)(rho) profiles determined experimentally from FFT are compared to those calculated with the transport code ASTRA. Finally, the total absorbed ECRH power is obtained experimentally by using a self-consistent power balance scheme.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 20675
ISI: 000180724300007
 Degree: -

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Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 44 Sequence Number: - Start / End Page: 2583 - 2602 Identifier: ISSN: 0741-3335