Abstract
4.6GHz/6MW Lower Hybrid Current Drive (LHCD) is one of plasma current heating methods for Experimental Advanced Superconducting Tokamak (EAST). High Voltage Power Supply (HVPS) is the power supply subsystem of 4.6GHz/6MW LHCD system, which was designed, built and accepted successfully by Chinese National Development and Reform Commission in 2015. Then the new system has been in use for the 2015 EAST campaign. This paper presents the structure of 4.6GHz/6MW LHCD-HVPS and its transient operation state when its klystron load has short circuit fault. In order to protect the klystron and HVPS itself, the short-circuit fault and its transient process are analyzed and calculated in detail. And a three-electrode gas switch has been built to eliminate the short-circuit fault in microseconds. In addition, the effectiveness of the three-electrode gas switch has been verified by simulation and experiment result. The HVPS has been used in 4.6GHz/6MW LHCD system and it has good performance for the entire 2015 EAST campaign.
Highlights
The Experimental Advanced Superconducting Tokamak (EAST) [1] is the first non-circular section and fully superconducting tokamak
In order to satisfy the property of Lower Hybrid Wave (LHW) [5], [6] from 4.6GHz lower hybrid current drive (LHCD), the 4.6GHz/6MW LHCD High Voltage Power Supply (HVPS) based on Pulse Step Modulation (PSM) switching technology [7], [8], [9] has been built in the meantime
4.6GHz/6MW LHCD system is successfully used in 2015 EAST campaign
Summary
The Experimental Advanced Superconducting Tokamak (EAST) [1] is the first non-circular section and fully superconducting tokamak. In order to achieve steady state and high performance plasma current, a new lower hybrid current drive (LHCD) [2], [3], [4] system at a frequency of 4.6 GHz with 6MW power has been built in 2014 and been accepted successfully by Chinese National Development and Reform Commission in 2015. In order to satisfy the property of Lower Hybrid Wave (LHW) [5], [6] from 4.6GHz LHCD, the 4.6GHz/6MW LHCD High Voltage Power Supply (HVPS) based on Pulse Step Modulation (PSM) switching technology [7], [8], [9] has been built in the meantime. In order to avoid damage the klystron loads and HVPS itself, the power energy absorbed by one klystron must be no more than 10J [10], [11] from start of short-circuit fault to action of protection switch. The experimental results with 4.6GHz/6MW LHCD system is presented in 2015 EAST campaign, demonstrating the capability of system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
