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RISS 인기검색어
- 검색키워드
- 저자 : Vinyar, Igor (검색결과 2 건)
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Pellet injectors for EAST and KSTAR tokamaks
Vinyar, Igor,Hu, Jiansheng,Park, Soo-Hwan,Lukin, Alexander,Yao, Xinjia,Li, Changzheng,Chen, Yue,Reznichenko, Pavel,Kim, Hong-Tack Elsevier 2017 Fusion engineering and design Vol.124 No.-
<P><B>Abstract</B></P> <P>The paper presents high frequency pellet injectors developed for edge localized mode mitigation and plasma fuelling of the EAST and KSTAR tokamaks. Each pellet injector is able to inject solid deuterium or hydrogen pellets at steady state mode. Injectors consist of modules including screw extruder cooled by liquid helium and pneumatic punchers for pellet fabrication and acceleration which are optimized to reach maximal injection frequency for specified pellet parameters.</P> <P>The EAST pellet injector is capable of injecting 1.5mm diameter and 1.2–1.8mm length pellets at frequency up to 50Hz with velocities 200–250m/s using two injection modules working in an alternating mode at 25Hz each. Injection reliability over 90% has been confirmed during several cycles of continuous D2 pellet injection at 50Hz. The KSTAR pellet injector has been designed to inject 2mm size pellets at frequency up to 20Hz and velocity 200m/s. Due to improved design of pellet fabrication and acceleration system the world record in continuous injection of 20,164 deuterium pellets (Ø2.0×1.5mm) for 1039s at 20Hz with reliability 97% has been achieved.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 50Hz and 20Hz pellet injectors have been developed for edge localized mode mitigation and steady state plasma fuelling of the EAST and KSTAR tokamaks. </LI> <LI> Innovative pellet fabrication systems have been designed to achieve world record in continuous pellet injection during 1039s at 20Hz with reliability 97%. </LI> <LI> Both pellet injectors have achieved ITER relevant characteristics of plasma fuelling and ELM control. </LI> </UL> </P>
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Development of pellet injection system for KSTAR
Park, Soo-Hwan,Kim, Hong-Tack,Vinyar, Igor,Lee, Juhyoung,Lukin, Alexander,Kim, Kyungmin,Park, Hyun-Ki,Ahn, Hee-Jae,Lee, Jonghwa Elsevier 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>KSTAR (Korea Superconducting Tokamak Advanced Research) has used a gas puffing system as a main fueling method since 2008. Up to date total fueling efficiency of the gas puff is less than 30%. A pellet injection is a more effective technique to control a plasma density than the gas puffing system and a supersonic molecular beam injection. Therefore, we have developed the pellet injection system for KSTAR. The pellet injection system for KSTAR consists of a pellet injector which injects pellets of a deuterium (diameter of 2mm, length of 1.5–2mm) at a velocity above 200m/s with an injection frequency of 1–20Hz, a 2-stage differential pumping system, a guide tube, a control system and so on. It is planned to inject pellets through a high field side and increase the plasma performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Development of the pellet injection system for KSTAR is carried out successfully. </LI> <LI> The performance of pellet injector meets requirements and our expectation during commissioning. </LI> <LI> Modification of guide tube, optimization of cooling facility and so on will be done. </LI> </UL> </P>
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