Study on Fluctuations during the RF Current Ramp-up Phase in 射频电流斜坡阶段期间波动研究.ppt
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1、Study on Fluctuations during the RF Current Ramp-up Phase in the CPD Spherical Tokamak,H. Zushi1), T. Ryoukai2), K. Kikukawa2), T. Morisaki3), R. Bhattacharyay2), T. Yoshinaga1,3), K. Hanada1), T.Sakimura2), H. Idei1), K. Dono 2), N. Nishino4), H. Honma2), S. Tashima2), T. Mutoh3), S. Kubo3), K. Nag
2、asaki5), M. Sakamoto1), Y. Nakashima6), Y. Higashizono1), K. N. Sato1), K. Nakamura1), M. Hasegawa1), S. Kawasaki1) H. Nakashima1), A. Higashijima1) RIAM, Kyushu University, Kasuga, Fukuoka, Japan, 816-8580, 2) IGSES, Kyushu University, Kasuga, Fukuoka, Japan, 816-8580, 3) National Institute for Fus
3、ion Science, 4) Hiroshima University, 5) Kyoto University, 6) University of Tsukuba, zushitriam.kyushu-u.ac.jp,4th IAEA TCM on Spherical tori and 14th International workshop on Spherical Torus ENEA Frascati, October 7-10, 2008,1,Motivation,Why steady Bz is required for The initial condition ?,Forres
4、t PRL 1992,Confine the trapped electrons = toroidal precession current Pressure driven/ Uni-directional PS current = seed toroidal current,Motivation (Role of Bz),Slab-Annulus plasma is unstable because of bad curvature,QUEST,CPD,Fast camera image shows vertically moving modes,Slab plasma in simple
5、torus,Fluctuations & Conversion efficiency,TOX v.s. Ln at f=8.2 GHz. Fluctuation level= 1% (solid-circle), 10% (dot-dashed), and 20% (dotted), and 40 % (solid-square). lpol =20 mm, and parallel refractive index N|=0.7.,According to Laqua PRL 1997,Open to Closed flux surfaces during the current ramp,
6、#507034,External Bv Field,Closed Flux Surface on the Flattop,Ip increases slowly with the slow increase of Pinj (60kW for Ip 1.7kA).Less effective than current jump(Pinj 30kW for Ip 2kA).,Center Post,Vertical shift is suppressed under Bv field with higher decay index.,t = 0.146 s,Yoshinaga ICPP2008,
7、OUTLINE,Diagnostics of fluctuations Results during the current ramp-up 2-1) fluctuations in slab-annulus plasma role of Bz 2-2) fluctuations during the current jump 3. Summary,7,RF antenna,HX(CdTe-PHA),VUV spectrometer,SX array,Visible monitor,Li-CCD,Fast camera (10ms),Rotating Pump limiter,Pump(TMP
8、,Cryo),Probe,Ha filter,Li-BES (50 PMTs),Rogowskii coil,Medium speed camera(1ms),AM-reflectometer,Stray rf power,Stray rf power,IR-TV camera,IR spectroscopy,Visible spectroscopy,(Hyougo Univ),CT injector,(NIFS),(NIFS),(NIFS),(NIFS),(Hirosima Univ.),(Tsukuba Univ.),CS,I.,45 Flux loop coils,8,Ex.,Ex.,2
9、fce,fce,fce,Open,Closed+Open,Bt=0.29T, Bv=40G, Ip3kA,Rf 8.2GHz, 60kW,I. CPD Li-imaging (CCD & LBFS),4 TFcoils,Typical discharge,Fluctuations in Annulus Plasma w/o Bz,1 kW,Rres=164 mm,LF mode with Long correlation length,lR 5 cm lz 2.5 cm,Bz suppresses density fluctuations,Density profile is not sign
10、ificantly affected by Bz ( 50G) However, the fluctuation level is much reduced.,Bt=0.29T,Bz 50 G,Power spectrum and coherency are much reduced,Square coherency at 2kHz,Low frequency components are reduced as Bz increases. Correlation length is drastically reduced.,Better conversion,Bz is desirable t
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