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Tao LAN, Chen CHEN, Chijin XIAO, Weixing DING, Jie WU, Wenzhe MAO, Sen ZHANG, Defeng KONG, Shoubiao ZHANG, Zhengwei WU, Qilong DONG, Yongkang ZHOU, Hangqi XU, Jiaren WU, Zian WEI, Xiaohui WEN, Hai WANG, Chu ZHOU, Adi LIU, Hong LI, Jinlin XIE, Wandong LIU, Ge ZHUANG. Preliminary compact torus injection experiments on the Keda Torus eXperiment reversed field pinch[J]. Plasma Science and Technology, 2024, 26(10): 105102. DOI: 10.1088/2058-6272/ad60f4
Citation: Tao LAN, Chen CHEN, Chijin XIAO, Weixing DING, Jie WU, Wenzhe MAO, Sen ZHANG, Defeng KONG, Shoubiao ZHANG, Zhengwei WU, Qilong DONG, Yongkang ZHOU, Hangqi XU, Jiaren WU, Zian WEI, Xiaohui WEN, Hai WANG, Chu ZHOU, Adi LIU, Hong LI, Jinlin XIE, Wandong LIU, Ge ZHUANG. Preliminary compact torus injection experiments on the Keda Torus eXperiment reversed field pinch[J]. Plasma Science and Technology, 2024, 26(10): 105102. DOI: 10.1088/2058-6272/ad60f4

Preliminary compact torus injection experiments on the Keda Torus eXperiment reversed field pinch

  • A new compact torus injector (KTX-CTI) has been built for injection experiments on the Keda Torus eXperiment (KTX) reversed field pinch (RFP). The aim is to study the fundamental physics governing the compact torus (CT) central fueling processes. In experiments conducted under the sole influence of a 0.1 T toroidal magnetic field, the injected CT successfully penetrated the entire toroidal magnetic field, reaching the inner wall of the KTX vacuum vessel. Upon reaching the inner wall, the CT diffused both radially outward and toroidally within the vessel at a discernible diffusion speed. Moreover, the inherent helicity within the CT induced a modest KTX plasma current of 200 A, consistent with predictions based on helicity conservation. CT injection demonstrated the capability to initiate KTX discharges at low loop voltages, suggesting its potential as a pre-ionization and current startup technique. During RFP discharges featuring CT injection, the central plasma density was found to exceed the Greenwald density limit, with more peaked density profiles, indicating the predominant confinement of CT plasma within the core region of the KTX bulk plasma.
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