Parameter Analysis for Arc Snubber of EAST Neutral Beam Injector

• 作 者: 王海田 李格 曹亮 党晓强 傅鹏
• 机 构: Department of Electrical Engineering, Shanghai Jiaotong University,Department of Electronic and Info
• 出 处: Plasma Science and Technology
• 发表日期: 2004年期
• 关键词: EAST saturated exponential breakdown dimensions capacitance inductive magnetizat

According to the B-H curve and structural dimensions of the snubber by the Fink-BakerMethod, the inductive voltage and the eddy current of any core tape with the thicknessof the saturated regions are derived when the accelerator breakdown occurs. Using the Ampere'slaw, in each core tape, the eddy current of the core lamination is equal to the arc current, andthe relation of the thickness of the saturated regions for different laminations can be deduced.The total equivalent resistance of the snubber can be obtained. The transient eddy current modelbased on the stray capacitance and the equivalent resistance is analyzed, and the solving processis given in detail. The exponential time constant and the arc current are obtained. Then, themaximum width of the lamination and the minimum thickness of the core tape are determined.The experimental time constant of the eddy current obtained, with or without the bias current,is approximately the same as that by the analytical method, which proves the accuracy of theadopted assumptions and the analysis method.

According to the BH curve and structural dimensions of the snubber by the Fink-Baker Method, the inductive voltage and the eddy current of any core tape with the thickness of the saturated regions are derived when the accelerator breakdown occurs. Using the Ampere'slaw, in each core tape, the eddy current of the core lamination is equal to the arc current, and the relation of the thickness of the saturated regions for different laminations can be deduced. The total equivalent resistance of the snubber can be obtained. The transient eddy current model based on the stray capacitance and the equivalent resistance are analyzed, and the solving process is given in detail. Then, the maximum width of the lamination and the minimum thickness of the core tape are determined. experimental time constant of the eddy current obtained, with or without the bias current, is approximately the same as that that by the analytical method, which proves the accuracy of theadopted assumptions and the analysis method.