A method of determining radial impurity emission profiles is outlined. The method uses correlations between line integrated signals and is based on the assumption of cylindrically symmetric fluctuations. Measurements at the reversed field pinch EXTRAP T2R show that emission from impurities expected to be close to the edge is clearly different in raw as well as analyzed data to impurities expected to be more central. Best fitting of experimental data to simulated correlation coefficients yields emission profiles that are remarkably close to emission profiles determined using more conventional techniques. The radial extension of the fluctuations is small enough for the method to be used and bandpass filtered signals indicate that fluctuations below are cylindrically symmetric. The novel method is not sensitive to vessel window attenuation or wall reflections and can therefore complement the standard methods in the impurity emission reconstruction procedure.
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April 2006
Research Article|
April 28 2006
Method for measuring radial impurity emission profiles using correlations of line integrated signals
M. Kuldkepp;
M. Kuldkepp
a)
Department of Physics,
KTH
, EURATOM-VR Association, SE-10691 Stockholm, Sweden
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P. R. Brunsell;
P. R. Brunsell
Alfvén Laboratory,
KTH
, EURATOM-VR Association, SE-10044 Stockholm, Sweden
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J. Drake;
J. Drake
Alfvén Laboratory,
KTH
, EURATOM-VR Association, SE-10044 Stockholm, Sweden
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S. Menmuir;
S. Menmuir
Department of Physics,
KTH
, EURATOM -VR Association, SE-10691 Stockholm, Sweden
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E. Rachlew
E. Rachlew
Department of Physics,
KTH
, EURATOM -VR Association, SE-10691 Stockholm, Sweden
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a)
Electronic mail: kuldkepp@atom.kth.se
Rev. Sci. Instrum. 77, 043508 (2006)
Article history
Received:
December 21 2005
Accepted:
March 20 2006
Citation
M. Kuldkepp, P. R. Brunsell, J. Drake, S. Menmuir, E. Rachlew; Method for measuring radial impurity emission profiles using correlations of line integrated signals. Rev. Sci. Instrum. 1 April 2006; 77 (4): 043508. https://doi.org/10.1063/1.2195122
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