KT-ST稳态马克装置建立及初步实验研究结果
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摘要
本文主要的工作是在中国科学技术大学等离子体物理专业的KT-ST稳态等离子体环形装置上进行的,包括KT-ST稳态磁面位形放电装置的建立以及在此放电位形下等离子体性质的初步实验研究。
首先,设计了在真空室小截面中心的金属内置导体环及相关的配套系统,包括去离子体冷却系统、稳流极向场及纵场供电电源、无油真空抽充气系统、自动化远程控制系统等。完成了整套系统的安装、调试,并实现了稳态等离子体放电的成功运行。新升级后的装置命名为KT-ST。KT-ST稳态马克的KT-ST意义是K表示科大,T表示类似托克马克的环形装置,ST表示稳态/仿星器,兼有仿星马克意思,因为本装置与仿星器一样有真空磁面。
这些工作让KT-ST装置具备了一种新的工程实验的基础条件,使得其可以长时间保持一个具有类托卡马克磁面结构的等离子体环境。装置的适应性和可实验研究范围得到了有效的扩展,有利于进行托卡马克边界等离子体物理可比的实验。
本论文所实现的具有类似托卡马克磁场位形且可以进行稳态环形磁约束等离子体放电的装置,迄今为止在国际上尚未见有其他报道。
其次,本论文在完成装置建立的基础上,对磁面位形稳态放电的等离子体的性质进行了初步诊断。本论文利用CST软件模拟了KT-ST装置的磁力线位形,并测量了真空磁场的空间分布,发现实际测量值与理论模拟吻合的很好,并给出了安全因子在径向的分布。本论文还利用静电探针组对等离子体的重要基本参数的空间分布进行了诊断,给出了等离子体的密度、温度、悬浮电位等物理量在不同纵场、极向场、气压等放电条件下在水平径向或者垂直径向上的分布,对分布进行了相关的比较,并给出了初步的讨论和物理解释。通过对极向剪切速度、径向输运损失等物理量的考查,给出了等离子体极向旋转的初步实验证据。
本论文还使用相机对等离子体发出的可见光进行了拍照,在10微秒量级的曝光时间下的等离子体照片表明,在此磁面放电位形下,等离子体确实有效的极向旋转了起来,为探针的数据提供了支持。
The work is performed in the steady state plasma torus device of KT-ST in the University of Science and Technology of China, This thesis presents the construction of the magnetic confinement plasma device KT-ST and the preliminary experiments of plasma basic properties with steady state discharge.
Firstly, we design the inner conductor torus in the center of the minor cross-section of the vacuum and the relevant auxiliary facilities, including an ion-free water device, power source providing power to the coils of toroidal and poloidal field, oil-free pumping system and the remote control system and so on. All devices were installed and tested on the site to be properly worked. KT-5D was named for KT-ST magnetic confinement device after upgrading. K means Keda, T means Tokamak-like Torus, ST means steadystate/stellarator and steady-mak.
The accomplishment mentioned above made it maintains the magnetic surfaces configuration similar to tokamak, the adaptability and flexibility of the device are remarkably improved. It is beneficial to research of the physics issues in tokamak magnetic configuration.
The set up of magnetic surfaces similar to tokamak with steady state plasma discharge was not reported yet elsewhere.
Secondly, the preliminary research of plasma properties in the magnetic surfaces configuration steadystate discharge is completed based on above work.we simulated the magnetic line of poloidal field by using CST software and measured the radial profiles of poloidal magnetic field in horizontal and vertical direction,theoretical value and experimental data is very consistent,meanwhile the profile of safety factor in radial direction is given. Some basic parameters of plasma with electrostatic probes movable horizontally and vertically along radial directions of the minor cross section of the vacuum were measured. The profile of basic parameters of plasma such as plasma density,electron temperature,floating voltage were provided with different discharge conditions(gas pressure,toroidal field,poloidal field) in the thesis,and we give preliminary discussion and physical explanations. the preliminary experimental evidence of plasma poloidal rotation is also given.
The camera was used to take pictures of the visible light emission of the plasma, the pictures of the exposure time of ten microseconds show plasma poloidal rotation is formed in magnetic surfaces configuration, which provides the support for the probe data.
首先,设计了在真空室小截面中心的金属内置导体环及相关的配套系统,包括去离子体冷却系统、稳流极向场及纵场供电电源、无油真空抽充气系统、自动化远程控制系统等。完成了整套系统的安装、调试,并实现了稳态等离子体放电的成功运行。新升级后的装置命名为KT-ST。KT-ST稳态马克的KT-ST意义是K表示科大,T表示类似托克马克的环形装置,ST表示稳态/仿星器,兼有仿星马克意思,因为本装置与仿星器一样有真空磁面。
这些工作让KT-ST装置具备了一种新的工程实验的基础条件,使得其可以长时间保持一个具有类托卡马克磁面结构的等离子体环境。装置的适应性和可实验研究范围得到了有效的扩展,有利于进行托卡马克边界等离子体物理可比的实验。
本论文所实现的具有类似托卡马克磁场位形且可以进行稳态环形磁约束等离子体放电的装置,迄今为止在国际上尚未见有其他报道。
其次,本论文在完成装置建立的基础上,对磁面位形稳态放电的等离子体的性质进行了初步诊断。本论文利用CST软件模拟了KT-ST装置的磁力线位形,并测量了真空磁场的空间分布,发现实际测量值与理论模拟吻合的很好,并给出了安全因子在径向的分布。本论文还利用静电探针组对等离子体的重要基本参数的空间分布进行了诊断,给出了等离子体的密度、温度、悬浮电位等物理量在不同纵场、极向场、气压等放电条件下在水平径向或者垂直径向上的分布,对分布进行了相关的比较,并给出了初步的讨论和物理解释。通过对极向剪切速度、径向输运损失等物理量的考查,给出了等离子体极向旋转的初步实验证据。
本论文还使用相机对等离子体发出的可见光进行了拍照,在10微秒量级的曝光时间下的等离子体照片表明,在此磁面放电位形下,等离子体确实有效的极向旋转了起来,为探针的数据提供了支持。
The work is performed in the steady state plasma torus device of KT-ST in the University of Science and Technology of China, This thesis presents the construction of the magnetic confinement plasma device KT-ST and the preliminary experiments of plasma basic properties with steady state discharge.
Firstly, we design the inner conductor torus in the center of the minor cross-section of the vacuum and the relevant auxiliary facilities, including an ion-free water device, power source providing power to the coils of toroidal and poloidal field, oil-free pumping system and the remote control system and so on. All devices were installed and tested on the site to be properly worked. KT-5D was named for KT-ST magnetic confinement device after upgrading. K means Keda, T means Tokamak-like Torus, ST means steadystate/stellarator and steady-mak.
The accomplishment mentioned above made it maintains the magnetic surfaces configuration similar to tokamak, the adaptability and flexibility of the device are remarkably improved. It is beneficial to research of the physics issues in tokamak magnetic configuration.
The set up of magnetic surfaces similar to tokamak with steady state plasma discharge was not reported yet elsewhere.
Secondly, the preliminary research of plasma properties in the magnetic surfaces configuration steadystate discharge is completed based on above work.we simulated the magnetic line of poloidal field by using CST software and measured the radial profiles of poloidal magnetic field in horizontal and vertical direction,theoretical value and experimental data is very consistent,meanwhile the profile of safety factor in radial direction is given. Some basic parameters of plasma with electrostatic probes movable horizontally and vertically along radial directions of the minor cross section of the vacuum were measured. The profile of basic parameters of plasma such as plasma density,electron temperature,floating voltage were provided with different discharge conditions(gas pressure,toroidal field,poloidal field) in the thesis,and we give preliminary discussion and physical explanations. the preliminary experimental evidence of plasma poloidal rotation is also given.
The camera was used to take pictures of the visible light emission of the plasma, the pictures of the exposure time of ten microseconds show plasma poloidal rotation is formed in magnetic surfaces configuration, which provides the support for the probe data.
引文
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