Abstract
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 language | English |
|---|---|
| Title of host publication | 22nd Symposium on Fusion Technology |
| Subtitle of host publication | Book of Abstracts |
| Place of Publication | Espoo |
| Publisher | VTT Technical Research Centre of Finland |
| Pages | 190-190 |
| ISBN (Electronic) | 951-38-5731-X |
| ISBN (Print) | 951-38-5730-1 |
| Publication status | Published - 2002 |
| MoE publication type | Not Eligible |
| Event | 22nd Symposium on Fusion Technology - Helsinki, Finland Duration: 9 Sept 2002 → 13 Sept 2002 Conference number: 22 |
Publication series
| Series | VTT Symposium |
|---|---|
| Number | 220 |
| ISSN | 0357-9387 |
Conference
| Conference | 22nd Symposium on Fusion Technology |
|---|---|
| Abbreviated title | SOFTA |
| Country/Territory | Finland |
| City | Helsinki |
| Period | 9/09/02 → 13/09/02 |
