Plasma current start-up and pre-ionization is an important motivation in Taban tokamak. The plasma current start-up has been successfully achieved using a central solenoid and a pre-ionization system and the experimental conditions have been optimized. Two distinct schemes were used to start-up the plasma current. Hot cathode emitter and electron cyclotron resonance (ECR) was used as the pre-ionization system. ECR pre-ionization circuit of 2.45 GHz magnetron was modified for long duration pulse mode. The transient plasma parameters were measured during discharge as a function of time in different conditions, while a toroidal field of 0.1 T with 4 ms flat-top was being applied. The experimental results showed that the plasma current could be started up by both ECR and hot cathode emitter. In the optimum conditions, a plasma current of 7.5 kA has been achieved with pulse duration of ~ 0.7 ms using the electron cyclotron pre-ionization system. Under such circumstances, the X-ray emission, as well as, the impurity level was minimized.

中文翻译：

---

塔班托卡马克的初步结果和等离子体电流启动

等离子体电流的启动和预电离是塔班托卡马克的重要动机。使用中央螺线管和预电离系统成功实现了等离子体电流启动，并优化了实验条件。使用两种不同的方案来启动等离子体电流。热阴极发射器和电子回旋共振（ECR）被用作预电离系统。2.45 GHz磁控管的ECR预电离电路被修改为长持续时间脉冲模式。在不同条件下，在放电期间测量瞬态等离子体参数作为时间的函数，同时应用 0.1 T 环形场和 4 ms 平顶。实验结果表明，ECR和热阴极发射器都可以启动等离子体电流。在最佳条件下，等离子体电流为 7。使用电子回旋加速器预电离系统以 ~ 0.7 ms 的脉冲持续时间实现了 5 kA。在这种情况下，X 射线发射以及杂质水平被最小化。