Electron cyclotron radiative transfer in fusion plasmas

Albajar, F.; Bornatici, M.; Engelmann, F.

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Electron cyclotron radiative transfer in fusion plasmas

Albajar, F., Bornatici, M., & Engelmann, F. (2003). Electron cyclotron radiative transfer in fusion plasmas. In G. Giruzzi (Ed.), Proceedings of the 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Heating (pp. 7-16). New Jersey, NJ: World Scientific Publ.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-2335-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-2336-3

Genre: Conference Paper

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Creators:
Albajar, F.¹, Author
Bornatici, M.¹, Author
Engelmann, F.², Author

Affiliations:
1DFEN, Universitat Polit' ecnica de Catalunya, Barcelona, Spain; INFM, Dipartimento di Fisica "A.Volta", Universit' a di Pavia, Pavia, Italy, ou_persistent22
2Office of the Director (DI), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856325

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Abstract: The approaches developed to describe radiative transfer of electron cyclotron (EC) radiation in a plasma in local thermodynamic equilibrium, taking due account of the nonlocal nature of the process owing to reabsorption and wall reflection, are reviewed. As for a cylindrical plasma with specularly reflecting walls an analytical solution of the equation of radiative transfer can be derived, an exact formula for the net power density radiated locally can be given in this case. Making use of an improved expression for the EC absorption coefficient, a detailed numerical analysis can be carried out varying both the wall reflection coefficient and the radial profile of the plasma temperature, which reveals that a reversal of the net power density profile can occur on the plasma out-board for sufficiently high wall reflectivity. A comparison with bremsstrahlung radiation profiles as well as approximate EC net power density profiles as calculated with the CYTRAN code developed by Tamor is performed. The total EC radiated power is also evaluated; its scaling with the reflection coefficient is found to be very well described by a scaling following from a recently established global model for the EC radiation, which improves the well-known Trubnikov scaling. The results obtained are discussed in view of their possible relevance to affecting the plasma temperature profile.

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Language(s): eng - English

Dates: Date issued: 2003

Publication Status: Issued

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Rev. Type: Internal

Identifiers: eDoc: 53040

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Title: Electron Cyclotron Emission and Electron Cyclotron Heating (EC-12)

Place of Event: Aix-en-Provence

Start-/End Date: 2002-05-13 - 2002-05-16

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Title: Proceedings of the 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Heating

Source Genre: Proceedings

Creator(s):
Giruzzi, G., Editor

Affiliations:
-

Publ. Info: New Jersey, NJ : World Scientific Publ.

Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 7 - 16 Identifier: ISBN: 981-238-189-9