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  4. 'Profile consistency' features in shaped sawtoothing ohmic TCV plasmas
 
research article

'Profile consistency' features in shaped sawtoothing ohmic TCV plasmas

Weisen, H.  
•
Behn, R.  
•
Furno, I.  
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1998
Plasma Physics and Controlled Fusion

A large variety of plasma conditions has been created in TCV (Tokamak a Configuration Variable, B-T < 1.5 T, R-0 = 0.88 m, a < 0.25 m). They include limited and diverted discharges with elongations in the range 1-2.58, triangularities between -0.7 and 1 as well as 'square' shapes with plasma currents in the range 0.1-1 MA. Over the entire range of quasi-stationary ohmic conditions investigated we observe a correlation between electron pressure profiles and conductivity profiles, suggesting that [p]/p(0) approximate to (j)/j(0), where [] refers to an average over the volume or respectively, the cross sectional area of the plasma. The profiles become broader as the average current density is increased. These 'profile consistency' features are in apparent agreement with theoretical considerations based on minimum energy states of the plasma or on stationary entropy. Further analysis of the experimental evidence, together with a model of the current profile consistent with neoclassical conductivity in the confinement zone and corresponding to a safety factor 0.8 less than or equal to q less than or equal to 1 inside the sawtoothing core, however, shows that the observations can be accounted for by the effects of sawtooth activity.

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Type
research article
DOI
10.1088/0741-3335/40/10/010
Web of Science ID

WOS:000076765500010

Author(s)
Weisen, H.  
Behn, R.  
Furno, I.  
Moret, J. M.  
Sauter, O.  orcid-logo
Date Issued

1998

Published in
Plasma Physics and Controlled Fusion
Volume

40

Issue

10

Start page

1803

End page

1818

Editorial or 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/20.500.14299/21482
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