HT—7托卡马克ECRH系统传输线设计

给出了用于HT-7超导托卡马克聚变实验装置的电子回旋共振加热（ECRH）系统大功率毫米波传输线的设计，该传输线将回旋管输出的频率为60GHZ，峰值功率200KW，脉冲宽度不大于100ms的毫米波传输数十米，在传输过程中将最初的TE02波转换为TE01波，再进一步转换至准线性TE11波，最终通过准光学天线将该毫米波以一定的角度发射到托卡马克等离子体中。     

The Design of an Elliptical Reflector in the Gaussianlike Antenna Used in HT-7 ECRH System

The structure of the antenna which will be used in HT-7 tokamak electron cyclotron resonance heating (ECRH) experiment and the desgn of its key component (the elliptical reflector) were introduced ,A quasi-Gaussian TE11 wave sent from the TE01-TE11 mode converter was reflected by two mirrors from the waveguide aperture to the plasma center area.One of the two mirrors is a plane mirror and the ather is an elliptical mirror,In this process,the wave beam will be converged by the two reflecting mirrors and the emissive direction of the wave is also controlled by bhem .As requested physically for ECRH experiment the arrangenent of the two mirrors can ensure the wave to be launced from the low-field side of the toure.     

Tokamak Start-up under Assistance of RF Waves

To improve the start-up behavior of tokamak discharges and realize the low loop voltage start-up is required by performance of large scale, full superconductor tokamaks. In recent years, some kinds of RF wave have been used to assist the start-up and some exciting results have been gained. This paper introduce the investigation on both in physical principle and experimental research of the start-up process, in which high frequency RF waves were used to assist it.     

在低混杂波频率范围大功率微波辅助下实现HT-7托卡马克低环电压启动

在HT－7托卡马克放电实验中，使用N∥谱实时可调，频率在等离子体低混杂波频率范围，功率达150－200kW的大功率微波，辅助托卡马克装置的加热场进行了等离子体放电。在低环电压下实现了托卡马克的成功启动。使用这种方法使HT－7装置的启动环电压由通常的20V左右下降到5V以下。这相当于实现了放电启动的最大加热场副边场强由2.5-3V/m降低到0.6V/m左右。实验还观察到，在这种微波辅助低环电压启动条件下，气体电离过程和等离子体电流建立过程中的伏秒数的消耗，初始等离子体的辐射等一系列不同于单纯欧姆放电过程的物理现象。     

Technology & Experiments of the Phase Adjustment of a Lower Hybrid Wave

1.IlltroductionLowerhybridwave(LHW)isakindofquasi-electrostaticwaveswhichcanpropagatewithlowerhybridmodeinmagneticallyconfinedplasma.Itcanbeusedintokamakplasmapre--ionization'heatingandcurrentdrive.Lowerhybridwavesystemmainlyincludesthefollowingseveralparts:awavesourcewhichcanproducemicrowaveofhighpowerandlongpulse;adirect-currenthigh-voltagepowersupplywhichsupplieselectricpowertowavesource,afeederandantennasystemwhichdeliversthewavetotokamakplasma;acontrollingsystemwhichcontrolseachchannel's…     

The Realization of Low Loop Voltage Start-up of HT-7 Tokamak Discharge with the Assistance of Lower Hybrid Wave

1. IntroductiollHT--7 tokamak [1] is a mlddle--scale superconduct-ing tokamak device including a varuum vessel witha najor radius of 1.22 m and a mlnor radius of0.3 m. Its toroidal field can reach 2.5 tesla andthe magnetic flux supplied by its heating field isabout l.7 volt-second(Vs). In general Ohmic dis-charge condltions, the main plasma parameters canreach ne ~ (1 -- 5) x 10"/cm', Te ~ l keV andL ~ 0.8 keV. The conventional method for tokamakstart-up ls to lonize the working gas and sus…