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  4. Beam propagation and stray radiation in the ITER EC H&CD Upper Launcher
 
conference paper

Beam propagation and stray radiation in the ITER EC H&CD Upper Launcher

Platania, P
•
Bruschi, A
•
Farina, D
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Kubo, S.
2015
EPJ Web of Conferences
18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-18)

The four ITER Electron Cyclotron Upper Launchers (UL) are designed to control Magneto-Hydrodynamic instabilities with the deposition of Electron Cyclotron power. According to the present design, each launcher comprises two rows of four input waveguides, whose output beam is focused and driven towards the plasma by four sets of mirrors. In order to study the beam-launcher interaction throughout quasi-optical propagation, with particular attention to straylight behaviour, and to verify analytical calculations, a 3D model of the UL optical system has been implemented with the electromagnetic code GRASP (R) and the Physical Optics method. Detailed description of the components are introduced: pure hybrid mode HE11 from cylindrical waveguide as input beams, real shapes of the mirror contours, semi-analytical description of the ellipsoidal surfaces of focussing mirrors. A conceptual calculation scheme has been developed in order to take into account not only the direct contribution of the single source on its next scatterer but also the first order indirect effects: crosstalk from different lines of the same row and crosstalk from different rows have been evaluated after reflection on the first and third set of mirrors. The evaluations presented have been performed on the preliminary UL design, the last major milestone before finalization; however, the numerical model is suitable to be applied to future evolutions of the setup and/or other configurations.

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Type
conference paper
DOI
10.1051/epjconf/20158702018
Web of Science ID

WOS:000358327700029

Author(s)
Platania, P
Bruschi, A
Farina, D
Figini, L
Goodman, T P
Krause, A
Henderson, M A
Moro, A
Saibene, G
Toussaint, M
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Editors
Kubo, S.
Date Issued

2015

Publisher

EDP Sciences

Published in
EPJ Web of Conferences
Volume

87

Start page

02018

Subjects

ECH

•

ECCD

•

ITER

•

Upper Launcher

•

Stray radiation

URL

URL

http://ec18.nifs.ac.jp/

URL

https://crpplocal.epfl.ch/pinboard/papers/143111801.pdf
Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
SPC  
Event nameEvent placeEvent date
18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-18)

Nara, Japan

22-25 April 2014

Available on Infoscience
March 25, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/112741
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