Balun Technology for Bipolar Pulsed Power Supply

  • A new type slotted pipe kicker with advantage of low coupling impedance is adopted for the major upgrading of the Beijing Electron Positron Collider (BEPCⅡ). A bipolar pulsed power supply is needed for the new type kicker. In order to avoid difficulties caused by the floating-thyratron scheme, a balun is introduced into the LC series resonance circuit with a grounded thyratron. The current balance degree between primary and secondary coils must be considered for the balun as a high-voltage fast-pulsed transformer for the special purpose. The unbalanced currents include magnetizing current and equivalent current of eddy-current loss in core. A nanocrystalline tape-wound toroid annealed in transverse magnetic field is chosen for the balun. To reduce leakage inductance, a simply parallel flat structure is adopted in design of transformer primary and secondary conductors. The test results on the prototype confirm the design theory and current balance degree of the balun reaches the design target of D<1%.
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  • [1] . KANG Wen, HAN Qian, HAO Yao-Dou. HEP NP, 2003,27(3): 263-267(in Chinese)(康文,韩谦,郝耀斗.高能物理与核物理,2003, 27(3): 263-267)2. Blokesch G, Negrazus M, Wille K. Nuclear Instruments andMethods in Physics Research, 1994, A338: 151-1553. WANG Rui-Hua. Pulsed Transformer Design. Beijing: Sci-ence Press, 1987(in Chinese)(王瑞华.脉冲变压器设计.北京:科学出版社,1987)4. DONG Chong. Transmission Line Type Pulsed ModulatorTheory Foundation and Special Circuit. Beijing: NationalDefence Industry Press, 1978(in Chinese)(东冲.线型脉冲调制器理论基础与专用电路.北京:国防上业出版社,1978)5. Калантаров ПЛ. Inductance Calculation Manual. Bei-jing: China Machine Press, 1992(in Chinese)(卡兰塔罗夫.电感训算手册.北京:机械上业出版社,1992)6. FENG Ci-Zhang. Engineering Electromagnetic Field Intro-ductory Theory. Beijing: Higher Education Press, 2000(in Chinese)(冯慈璋.工程电磁场导论.北京:高等教育出版社,2000)
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Get Citation
CHEN Jin-Hui, HAN Qian and KANG Wen. Balun Technology for Bipolar Pulsed Power Supply[J]. Chinese Physics C, 2006, 30(9): 896-901.
CHEN Jin-Hui, HAN Qian and KANG Wen. Balun Technology for Bipolar Pulsed Power Supply[J]. Chinese Physics C, 2006, 30(9): 896-901. shu
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Received: 2005-12-24
Revised: 2006-02-13
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Balun Technology for Bipolar Pulsed Power Supply

    Corresponding author: CHEN Jin-Hui,
  • Institute of High Energy Physics, CAS, Beijing 100049, China

Abstract: A new type slotted pipe kicker with advantage of low coupling impedance is adopted for the major upgrading of the Beijing Electron Positron Collider (BEPCⅡ). A bipolar pulsed power supply is needed for the new type kicker. In order to avoid difficulties caused by the floating-thyratron scheme, a balun is introduced into the LC series resonance circuit with a grounded thyratron. The current balance degree between primary and secondary coils must be considered for the balun as a high-voltage fast-pulsed transformer for the special purpose. The unbalanced currents include magnetizing current and equivalent current of eddy-current loss in core. A nanocrystalline tape-wound toroid annealed in transverse magnetic field is chosen for the balun. To reduce leakage inductance, a simply parallel flat structure is adopted in design of transformer primary and secondary conductors. The test results on the prototype confirm the design theory and current balance degree of the balun reaches the design target of D<1%.

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