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research article

Overview of ASDEX upgrade results

Zohm, H.
•
Angioni, C.  
•
Arslanbekov, R.
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2003
Nuclear Fusion

Recent results from the ASDEX Upgrade experimental campaigns 2001 and 2002 are presented. An improved understanding of energy and particle transport emerges in terms of a 'critical gradient' model for the temperature gradients. Coupling this to particle diffusion explains most of the observed behaviour of the density profiles, in particular, the finding that strong central heating reduces the tendency for density profile peaking. Internal transport barriers (ITBs) with electron and ion temperatures in excess of 20 keV (but not simultaneously) have been achieved. By shaping the plasma, a regime with small type 11 edge localized modes (ELMs) has been established. Here, the maximum power deposited on the target plates was greatly reduced at constant average power. Also, an increase of the ELM frequency by injection of shallow pellets was demonstrated., ELM free operation is possible in the quiescent H-mode regime previously found in DIII-D which has also been established on ASDEX Upgrade. Regarding stability, a regime with benign neoclassical tearing modes (NTMs) was found. During electron cyclotron current drive (ECCD) stabilization of NTMs, beta(N) could be increased well above the usual onset level without a reappearance of the NTM. Electron cyclotron resonance heating and ECCD have also been used to control the sawtooth repetition frequency at a moderate fraction of the total heating power. The inner wall of the ASDEX Upgrade vessel has increasingly been covered with tungsten without causing detrimental effects on the plasma performance. Regarding scenario integration, a scenario with a large fraction of noninductively driven current (greater than or equal to50%), but without ITB has been established. It combines improved confinement (tau(E)/tau(ITER98) approximate to 1.2) and stability (beta(N) less than or equal to 3.5) at high Greenwald fraction (n(e)/n(GW) approximate to 0.85) in steady state and with type 11 ELMy edge and would offer the possibility for long pulses with high fusion power at reduced current in ITER.

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Type
research article
DOI
10.1088/0029-5515/43/12/004
Web of Science ID

WOS:000187838300005

Author(s)
Zohm, H.
•
Angioni, C.  
•
Arslanbekov, R.
•
Atanasiu, C.
•
Becker, G.
•
Becker, W.
•
Behler, K.
•
Behringer, K.
•
Bergmann, A.
•
Bilato, R.
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Date Issued

2003

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

43

Issue

12

Start page

1570

End page

1582

Subjects

ITER

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
April 16, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/21896
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