Overview of the ITER-FEAT LH system

Ph. Bibet, F. Mirizzi, P. Bosia, L. Doceul, S. Kuzikov, Karin Rantamäki, A. Tuccillo, Frej Wasastjerna

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific


LH is considered to be used in ITER FEAT steady-state scenario in order to drive the current in the plasma outer part, region where its current drive efficiency is the highest compared with other CD system. It can also be used to stabilise NTM mode and o control the current profile. For this purpose, the design of a LH system able to inject 20 MW at 5 GHz CW, radiated at a N// peak value of 2, has been done. It is composed of: · a transmitter with 24, 1 MW CW, sources, fed in group of 4 by HV DC power supply. · a transmission line, 60 m long. Its main components are: a recombiner network used to combine the power of 4 tubes and to transform the propagating mode from TE10 rectangular mode to TE01 circular mode, an oversized circular straight part, bends and m de filters. · a launcher based on Passive Active Multijunction (PAM) concept. It is made of 2 main parts: the Cryostat Part (CP) and the Vacuum Part (VP). On the flange of the CP there are 24 RF windows. Each of them is linked to one 3 dB hybrid coupler which then eeds the VP through two RF windows installed on the vacuum flange. Each RF window feeds one TE10 to TE30 mode converter connected to a 4.77 dB, H plane coupler, followed by multijunction made of 8 active waveguides. The VP is inserted in a casing simila to other RF system The following preliminary studies have been done: · the coupling and the power directivity of the launcher have been analysed with SWAN code as a function of the electron density, · acceleration of electrons in the antenna near field has been checked, · thermal analysis have been done with Castem 2000 code taking into account the neutron flux, the plasma radiated flux and the RF losses, · mechanical stress due to disruption has been analysed, · the level of activation in the different part of the antenna has been estimated, · RF computations have been performed [1]. After a general overview of the whole LH system, the results of the previous studies will be given. The general conclusion is that a reliable LH system in the ITER FEAT environment is totally feasible. [1] The main microwave components of the LHH&CD system for ITER. F. Mirizzi, Ph. Bibet, S. Kuzikov# , this Conference.
Original languageEnglish
Title of host publication22nd Symposium on Fusion Technology
Subtitle of host publicationBook of Abstracts
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
ISBN (Electronic)951-38-5731-X
ISBN (Print)951-38-5730-1
Publication statusPublished - 2002
MoE publication typeNot Eligible
Event22nd Symposium on Fusion Technology - Helsinki, Finland
Duration: 9 Sept 200213 Sept 2002
Conference number: 22

Publication series

SeriesVTT Symposium


Conference22nd Symposium on Fusion Technology
Abbreviated titleSOFTA


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