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Electron cyclotron current start-up as a scheme to initiate ohmic discharges has been investigated with two circuits of open and shorted primary windings of transformer. The experimental results indicate that we can achieve the saving of equivalent flux and the reduction of starting voltage in the initial phase for the two circuits in fundamental frequency resonance region. 相似文献
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用一米掠入射真空紫外光谱仪拍摄了CT-6B托卡马克等离子体的杂质光谱,波长区为1580—550?和460—43?。观察到限制器材料钼的谱线MoⅧ234.314?,235.510?和237.215?,以及低Z杂质C,N,O的谱线。它们的最高电离阶分别为MoⅧ,OⅦ,CⅣ和NⅤ。在这些杂质光谱中,OⅤ和OⅥ谱线出现得多而且强,说明氧是CT-6B等离子体的主要杂质,它的线辐射在CT-6B辐射损失中占主要部分。观察到的最短波长为OⅦ 21.6020?和21.804?的二级谱。由MoⅧ和OⅦ谱线的出现可以估计出CT-6B等离子体平均电子温度约为140eV。在所观察波长区内,未发现真空室壁材料Fe,Ni,Cr,Ti等杂质的谱线。
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The poloidal rotation velocity of neutral hydrogen atoms is measured using the Doppler shift of the Hα spectral line emitted in the CT-6B tokamak. The poloidal rotation of hydrogen atoms is generated through the collisions and charge-exchanges with main ions (protons). Therefore, the rotation direction of main ions can be deduced from that of neutral hydrogen atoms. The experimental results show that the main ions rotate in the electron diamagnetic drift direction, the same as the impurity ions, in the plasma core. The neutral hydrogen atoms rotate also in the electron diamagnetic drift direction in the edge region of the plasma. However, the rotation direction of main ions in the edge region cannot be judged from the experimental result due to the long mean free path of hydrogen atoms in the edge region. An inward diffusion flux of hydrogen atoms toward the torus inside with a velocity of the same order of magnitude as their poloidal rotation is also observed. 相似文献
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在CT-6B托卡马克装置上,用一米掠入射真空紫外单色仪测量了氧杂质各阶离子OII-OVI的谱线辐射的时间变化,用HCN远红外激光干涉仪测量了电子密度的时间变化。利用谱线时间史的方法,由谱线起始时间估算了放电初期电流上升阶段电子温度的时间变化。用数值计算分别考察了氧杂质进入通量和约束时间对谱线峰值强度和起始时间的影响。估算得到的电子温度在放电开始后0.36,0.56,0.66,0.90和1.4ms,分别为3.6,5.6,7.3,10.8和21eV,它们反映了放电初期等离子体中心区电子温度的变化。
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利用高分辨光谱测量系统,根据杂质离子谱线OⅡ464.2nm,CⅢ464.7nm和氢Hα谱线的多普勒位移,测量了CT-6B托卡马克等离子体角向转动速度的径向分布.结果表明:杂质离子的角向转动速度的方向在等离子体内部为电子逆磁漂移方向,其线速度在小半径约9cm处达到极大值3.5km/s;在接近孔阑r=10cm处,反转为离子逆磁漂移方向.由此导出等离子体内部的径向电场向里,其最大值为18V/cm.中性氢原子只存在其方向为电子逆磁漂移方向的角向转动分量,其数值较杂质离子谱线所得结果要低.最后对所得的结果作了初步的讨论
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