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@ARTICLE{Puglia:820495,
author = {Puglia, P. and Pires de Sa, W. and Blanchard, P. and
Dorling, S. and Dowson, S. and Fasoli, A. and Figueiredo, J.
and Galvão, R. and Graham, M. and Jones, G. and Perez von
Thun, C. and Porkolab, M. and Ruchko, L. and Testa, D. and
Woskov, P. and Albarracin-Manrique, M. A.},
title = {{T}he upgraded {JET} toroidal {A}lfvén eigenmode
diagnostic system},
journal = {Nuclear fusion},
volume = {56},
number = {11},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2016-05789},
pages = {112020 -},
year = {2016},
abstract = {The main characteristics of toroidal Alfvén eigenmodes
(TAEs) have been successfully investigated in JET (Joint
European Torus) using the scheme of sweeping-frequency
external excitation with tracking of the
synchronously-detected resonances. However, due to technical
limitations, only modes with low values of the toroidal mode
number $n\leqslant 7$ could be effectively excited and
unambiguously identified by the Alfvén Eigenmode Active
Diagnostic (AEAD) system. This represents a serious
restriction because theoretical models indicate that
medium-n Alfvén eigenmodes (AEs) are the most prone to be
destabilized by energetic particles in ignited plasmas and,
therefore, reliable measurement of their damping rates
remains a relevant issue to properly access their effect in
ignited plasmas. For this reason, a major upgrade of the
AEAD system has been carried out aiming at providing a
state-of-the-art excitation and real-time detection system
for the planned DT campaign in JET. This required the
development of a new type of radio frequency amplifier and
filter, not commercially available, and also a control
system. In this paper, details of the concepts that are
relevant to understand the operation of the new system in
the next experimental campaigns are presented, as are the
results of numerical simulations to model its performance.},
cin = {IEK-4 / PTJ-MGS},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)PTJ-MGS-20090406},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000391393900020},
doi = {10.1088/0029-5515/56/11/112020},
url = {https://juser.fz-juelich.de/record/820495},
}