TY - JOUR
T1 - Computer tomography of M=1 mode during sawtooth oscillation with three soft x-ray detector arrays on the WT-3 tokamak
AU - Hanada, K.
AU - Ogura, K.
AU - Ide, S.
AU - Tanaka, H.
AU - Iida, M.
AU - Ito, T.
AU - Iwamasa, M.
AU - Yoshida, M.
AU - Minami, T.
AU - Nakamura, M.
AU - Maekawa, T.
AU - Terumichi, Y.
AU - Tanaka, S.
PY - 1990
Y1 - 1990
N2 - Soft X-rays (SXRs) emitted from plasma in the WT-3 tokamak were measured by three SXR detector arrays, viewing the plasma from three different angles. From these experimental data, the authors reconstructed the two dimensional (2-D) contour of constant SXR emissivity as a function of time, using the technique of computer tomography (CT). Computer simulation results show that data from three or more sets of detector arrays are required to reconstruct the 2-D emissivity structure with sufficient accuracy to distinguish Kadomtsev's model from the quasi-interchange (Wesson's) model of sawtooth crash. Further, it is shown that if the noise amplitude is more than 1.5%, reconstruction of the real 2-D SXR emissivity structure is difficult.
AB - Soft X-rays (SXRs) emitted from plasma in the WT-3 tokamak were measured by three SXR detector arrays, viewing the plasma from three different angles. From these experimental data, the authors reconstructed the two dimensional (2-D) contour of constant SXR emissivity as a function of time, using the technique of computer tomography (CT). Computer simulation results show that data from three or more sets of detector arrays are required to reconstruct the 2-D emissivity structure with sufficient accuracy to distinguish Kadomtsev's model from the quasi-interchange (Wesson's) model of sawtooth crash. Further, it is shown that if the noise amplitude is more than 1.5%, reconstruction of the real 2-D SXR emissivity structure is difficult.
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U2 - 10.1088/0741-3335/32/14/003
DO - 10.1088/0741-3335/32/14/003
M3 - Article
AN - SCOPUS:0009974349
SN - 0741-3335
VL - 32
SP - 1289
EP - 1299
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 14
M1 - 003
ER -