TY - JOUR
T1 - Density control by second harmonic X-mode ECRH in LHD
AU - LHD Experimental Group
AU - Kubo, Shin
AU - Shimozuma, Takashi
AU - Tanaka, Kenji
AU - Saito, Teruo
AU - Tatematsu, Yoshinori
AU - Yoshimura, Yasuo
AU - Igami, Hiroe
AU - Notake, Takashi
AU - Inagaki, Shigeru
AU - Tamura, Naoki
N1 - Publisher Copyright:
© 2008 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2008
Y1 - 2008
N2 - Density clamping or pump-out phenomena is observed both in tokamaks and helical systems during additional heating, particularly high power density heating as electron cyclotron resonance heating (ECRH). Enhanced electron convective flux induced by a perpendicular acceleration of electrons is one of the candidates of the mechanism of these phenomena. The mechanism of the enhancement of the electron flux is investigated experimentally by comparing the density profile evolutions due to second harmonic X (X2) mode ECRH at the ripple top and bottom. The result suggests that ECRH-induced electron flux is one of the dominant mechanisms of density clamping, which can be used as a powerful tool for controlling the particles and the heat transport.
AB - Density clamping or pump-out phenomena is observed both in tokamaks and helical systems during additional heating, particularly high power density heating as electron cyclotron resonance heating (ECRH). Enhanced electron convective flux induced by a perpendicular acceleration of electrons is one of the candidates of the mechanism of these phenomena. The mechanism of the enhancement of the electron flux is investigated experimentally by comparing the density profile evolutions due to second harmonic X (X2) mode ECRH at the ripple top and bottom. The result suggests that ECRH-induced electron flux is one of the dominant mechanisms of density clamping, which can be used as a powerful tool for controlling the particles and the heat transport.
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U2 - 10.1585/pfr.3.S1028
DO - 10.1585/pfr.3.S1028
M3 - Article
AN - SCOPUS:85026338515
SN - 1880-6821
VL - 3
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
M1 - S1028
ER -