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The data acquisition and control system for the operation of ASDEX pressure gauge for the measurement of neutral pressure in ADITYA Tokamak

机译:ASDEX压力表操作数据采集和控制系统,用于测量ADITYA Tokamak中的中性压力

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Bayard-Alpert (BA) type hot cathode ionisation gauge is widely used to measure neutral pressure precisely in vacuum system below 10(-3) Torr pressure. Neutral pressure measurement in magnetic confinement fusion experiments is quite challenging for standard BA type gauge due to higher pressure limitation and its ionisation is affected by strong magnetic and electrical fields. To overcome the above limitations, a special hot cathode ionisation gauge, named ASDEX Pressure Gauge (APG) system was developed by G. Haas at the Max-Planck-Institute, Germany. The APG system can work in high magnetic field up to 6 T and high temperature plasma environment with broad pressure measurement range from 10(-1) to 10(-6) mbar with fast response (< 10 msec) and good noise immunity.In the present work, we report the design and development of control and data acquisition of ASDEX Pressure Gauge (APG) for ADITYA Tokamak to measure real time neutral pressure during the high temperature plasma. The developed system can achieve synchronous control of gauge controller using General Purpose Interface Bus (GPIB) and data acquisition of ion emission current of gauge head using Peripheral Component Interconnect (PCI) based data acquisition module. Initially, the APG calibration with standard BA type hot cathode ionization gauge had been carried out using the test set-up of low magnetic field and ultrahigh vacuum system with gases like H-2, Ar, He. For APG calibration for various pressure ranges of these gases, precise gas feed control system has been developed using controller based hardware and LabVIEW based software. After testing and calibration, the APG was installed on ADITYA tokamak and calibrated under high magnetic field of ADITYA. The developed APG control system is configurable for presenting the gauge parameters before the plasma discharge. During plasma discharge, the analog signal equivalent to neutral pressure is acquired in real-time using simultaneous sampling analog to digital converter (ADC) module. The acquired raw data and processed real time pressure can provide valuable neutral pressure/density information of Tokamak plasma.
机译:Bayard-Alpert(BA)型热阴极电离计广泛用于在真空系统中精确测量低于10(-3)Torr压力的中性压力。对于标准的BA型压力表,由于较高的压力限制,在磁约束聚变实验中进行中性压力测量非常具有挑战性,并且其电离会受到强磁场和电场的影响。为了克服上述限制,德国马克斯普朗克研究所的G. Haas开发了一种特殊的热阴极电离计,称为ASDEX压力计(APG)系统。 APG系统可以在高达6 T的强磁场和高温等离子体环境中工作,压力测量范围从10(-1)到10(-6)mbar,响应速度快(<10毫秒),并且具有良好的抗噪性。在目前的工作中,我们报告了ADITYA Tokamak用来测量高温等离子体实时中性压力的ASDEX压力计(APG)的控制和数据采集的设计与开发。所开发的系统可以使用通用接口总线(GPIB)来实现对仪表控制器的同步控制,并且可以使用基于外围组件互连(PCI)的数据采集模块来实现仪表头离子发射电流的数据采集。最初,使用低磁场和超高真空系统(如H-2,Ar,He等气体)的测试装置,使用标准BA型热阴极电离规对APG进行了校准。为了对这些气体的各种压力范围进行APG校准,已经使用基于控制器的硬件和基于LabVIEW的软件开发了精确的气体进料控制系统。经过测试和校准后,将APG安装在ADITYA托卡马克上,并在ADITYA的强磁场下进行校准。可开发的APG控制系统可配置为在等离子放电之前显示仪表参数。在等离子放电期间,使用同时采样的模数转换器(ADC)模块实时获取相当于中性压力的模拟信号。所获取的原始数据和处理后的实时压力可以提供托卡马克等离子体的有价值的中性压力/密度信息。

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