TY - JOUR
T1 - Evaluation of particle source rate and its influence on particle transport in fusion plasma
AU - Goto, M.
AU - Sawada, K.
AU - Fujii, K.
AU - Hasuo, M.
AU - Morita, S.
PY - 2012
Y1 - 2012
N2 - We have carried out numerical inversion of the Laplace transform for the observed line profile, and have derived the intensity distribution function against the atom temperature. The temperature dependence is interpreted to the spatial dependence, where other diagnostic results are used, so that the radial profile of photon emission rate is derived. The photon emission rate is then interpreted to the ionization rate with the help of collisional-radiative model calculation. From the ionization rate derived we have evaluated the particle confinement time τp as a function of the average minor radius, reff, for two discharges characterized by the different magnetic field strength. In the strong field case, a turning point is clearly seen in the τp profile at around reff = 0.6, which corresponds to the last closed magnetic flux surface. In the weak field case, the absolute confinement time is approximately one-order smaller than that in the strong field case.
AB - We have carried out numerical inversion of the Laplace transform for the observed line profile, and have derived the intensity distribution function against the atom temperature. The temperature dependence is interpreted to the spatial dependence, where other diagnostic results are used, so that the radial profile of photon emission rate is derived. The photon emission rate is then interpreted to the ionization rate with the help of collisional-radiative model calculation. From the ionization rate derived we have evaluated the particle confinement time τp as a function of the average minor radius, reff, for two discharges characterized by the different magnetic field strength. In the strong field case, a turning point is clearly seen in the τp profile at around reff = 0.6, which corresponds to the last closed magnetic flux surface. In the weak field case, the absolute confinement time is approximately one-order smaller than that in the strong field case.
UR - http://www.scopus.com/inward/record.url?scp=84873671629&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/397/1/012023
DO - 10.1088/1742-6596/397/1/012023
M3 - Conference article
AN - SCOPUS:84873671629
SN - 1742-6588
VL - 397
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012023
T2 - 21st International Conference on Spectral Line Shapes, ICSLS 2012
Y2 - 3 June 2012 through 9 June 2012
ER -