Design of the ECRH/ECCD Launcher System for HL-2A Tokamak

An ECRH/ECCD system with two 68GHz/500kW/1S gyrotrons will be built up in HL-2A tokamak. The location of the Gaussian beam waist is 580 mm away from the center of the plasmas and the beam radius is 37 mm at the center of the plasmas. Compared to the minor plasma radius （420 mm）, it is small enough for localized control. The launcher system covers a wide toroidal and poloidal steering range by the two steering plane mirrors. Therefore it is possible to explore the on- and off-axis heating over half of the plasma minor cross section and the co-current drive.     

EAST 装置电子回旋共振加热系统波纹圆波导研究*

在EAST装置上正在建设140GHz/4MW/1000s电子回旋共振加热(ECRH)系统,单个回旋管输出的1MW功率通过波纹圆波导传输到天线聚焦镜上,然后经天线反射镜进入等离子体。运用表面阻抗法对波纹圆波导进行了理论分析,针对EAST装置ECRH系统需求的140GHz波纹圆波导进行了设计研究,所设计的波导传输模式为HE11模,具备1MW连续波运行能力且欧姆损耗低于0.02d B/100m,同时分析了HE11模在波导口外辐射模式及其与TEM00模耦合特性。     

Design of the Eelectron Cyclotron Resonance Heating Transmission System for HL-2A

HL-2A will be equipped with a 75 GHz/1 MW/ls electron cyclotron resonance heating (ECRH) system. The paper describes the design of the transmission system, which is made up of a transmission line, an equatorial launcher and a measureing system. The paper describes in detail the design of main components of the system such as, waveguides, ellipsoidal surface mirrors, chemical vapor (CVD) diamond window, steering mirror, and new directional coupler with a k-spectrometer. The newly-designed launcher can make the beam steer poloidally to deposit energy in different locations.     

ECRH Launcher for Four-Beam Injection on HL-2A Tokamak

An Electron Cyclotron Resonance Heating (ECRH) launcher for four-beam injection has been installed on the HL-2A tokamak and used in plasma heating experiments. By the launcher, four EC wave beams can be injected into the tokamak through a φ350 mm port, which are generated from 2 sets of 68 GHz/1 s and 2 sets of 68 GHz/1.5 s gyrotron tubes manufactured by GYCOM, with maximum output power of 500 kW for each. In this paper, the properties of the EC beam in the launcher and plasma are presented: at the centre of the cross section of the tokamak, the beam radius is 31.7 mm; thermal analysis of a 3D model indicates that the peak temperature increase would be only 30 o C at the mirror surface for a 500 kW/1 s pulse; ray-tracing calculation predicts satisfactory power deposition. In the plasma experiment, six beams including four beams from this launcher and two from another launcher have been injected simultaneously. Besides, obtaining ELM-y H-mode discharges, the ECRH system shows reliability and stability of the launcher functions.     

Structure Design and Analysis of High-Voltage Power Supply for ECRH

In order to develop a high-voltage power supply （HVPS） with high quality parame- ters, not only its electrical circuit but also its structure should be studied in detail. In this paper, the structure design of the collector power supply for gyrotron is discussed first. Then the electri- cal field and potential simulations of its inain devices are analyzed. Finally, relevant calculations and conclusions are given.     

ECRH系统中MOD控制系统的研究

负高压电源系统是电子回旋共振加热（ECRH）系统的重要组成部分,而MOD控制系统则是负高压电源系统乃至整个ECRH系统运行的关键。介绍了系统的理论背景和工作原理,并详细阐述了该控制系统的硬件结构和软件流程。实验运行表明,该系统运行稳定、控制正确、保护迅速可靠。     

基于单片机的脉冲发生器的设计与应用

本文介绍了我所电子回旋共振加热(ECRH)系统中所用到的基于单片机的脉冲发生器，给出脉冲发生器硬软件的具体设计。     

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.     

Development and Preliminary Commissioning Results of a Long Pulse 140 GHz ECRH System on EAST Tokamak(Invited)

A long pulse electron cyclotron resonance heating(ECRH)system has been developed to meet the requirements of steady-state operation for the EAST superconducting tokamak,and the first EC wave was successfully injected into plasma during the 2015 spring campaign.The system is mainly composed of four 140 GHz gyrotron systems,4 ITER-Like transmission lines,4 independent channel launchers and corresponding power supplies,a water cooling,control &inter-lock system etc.Each gyrotron is expected to deliver a maximum power of 1 MW and be operated at 100-1000 s pulse lengths.The No.1 and No.2 gyrotron systems have been installed.In the initial commissioning,a series of parameters of 1 MW 1 s,900 k W 10 s,800 k W 95 s and650 k W 753 s have been demonstrated successfully on the No.1 gyrotron system based on calorimetric dummy load measurements.Significant plasma heating and MHD instability suppression effects were observed in EAST experiments.In addition,high confinement(H-mode)discharges triggered by ECRH were obtained.