skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 250 kV 6 mA compact Cockcroft-Walton high-voltage power supply

Abstract

A compact power supply system for a compact neutron generator has been developed. A 4-stage symmetrical Cockcroft-Walton circuit is adopted to produce 250 kV direct current high-voltage. A 2-stage 280 kV isolation transformer system is used to drive the ion source power supply. For a compact structure, safety, and reliability during the operation, the Cockcroft-Walton circuit and the isolation transformer system are enclosed in an epoxy vessel containing the transformer oil whose size is about ∅350 mm × 766 mm. Test results indicate that the maximum output voltage of the power supply is 282 kV, and the stability of the output voltage is better than 0.63% when the high voltage power supply is operated at 250 kV, 6.9 mA with the input voltage varying ±10%.

Authors:
; ; ; ; ;  [1]; ; ;  [1];  [2]
  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22597655
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AVAILABILITY; COMPACTS; DIRECT CURRENT; ELECTRIC POTENTIAL; EPOXIDES; INSULATING OILS; ION SOURCES; NEUTRON GENERATORS; NEUTRONS; RELIABILITY; SAFETY; STABILITY; TRANSFORMERS

Citation Formats

Ma, Zhan-Wen, Su, Xiao-Dong, Wei, Zhen, Huang, Zhi-Wu, Miao, Tian-You, Su, Tong-Ling, Lu, Xiao-Long, Wang, Jun-Run, Yao, Ze-En, E-mail: zeyao@lzu.edu.cn, and Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, Lanzhou 730000. 250 kV 6 mA compact Cockcroft-Walton high-voltage power supply. United States: N. p., 2016. Web. doi:10.1063/1.4961475.
Ma, Zhan-Wen, Su, Xiao-Dong, Wei, Zhen, Huang, Zhi-Wu, Miao, Tian-You, Su, Tong-Ling, Lu, Xiao-Long, Wang, Jun-Run, Yao, Ze-En, E-mail: zeyao@lzu.edu.cn, & Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, Lanzhou 730000. 250 kV 6 mA compact Cockcroft-Walton high-voltage power supply. United States. doi:10.1063/1.4961475.
Ma, Zhan-Wen, Su, Xiao-Dong, Wei, Zhen, Huang, Zhi-Wu, Miao, Tian-You, Su, Tong-Ling, Lu, Xiao-Long, Wang, Jun-Run, Yao, Ze-En, E-mail: zeyao@lzu.edu.cn, and Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, Lanzhou 730000. Mon . "250 kV 6 mA compact Cockcroft-Walton high-voltage power supply". United States. doi:10.1063/1.4961475.
@article{osti_22597655,
title = {250 kV 6 mA compact Cockcroft-Walton high-voltage power supply},
author = {Ma, Zhan-Wen and Su, Xiao-Dong and Wei, Zhen and Huang, Zhi-Wu and Miao, Tian-You and Su, Tong-Ling and Lu, Xiao-Long and Wang, Jun-Run and Yao, Ze-En, E-mail: zeyao@lzu.edu.cn and Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, Lanzhou 730000},
abstractNote = {A compact power supply system for a compact neutron generator has been developed. A 4-stage symmetrical Cockcroft-Walton circuit is adopted to produce 250 kV direct current high-voltage. A 2-stage 280 kV isolation transformer system is used to drive the ion source power supply. For a compact structure, safety, and reliability during the operation, the Cockcroft-Walton circuit and the isolation transformer system are enclosed in an epoxy vessel containing the transformer oil whose size is about ∅350 mm × 766 mm. Test results indicate that the maximum output voltage of the power supply is 282 kV, and the stability of the output voltage is better than 0.63% when the high voltage power supply is operated at 250 kV, 6.9 mA with the input voltage varying ±10%.},
doi = {10.1063/1.4961475},
journal = {Review of Scientific Instruments},
number = 8,
volume = 87,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}
  • A 1.2 MV/50 mA symmetrical Cockcroft-Walton (SCW) power supply of over 83% power efficiency, driven by 50 Hz frequency, was developed for an industrial electron beam irradiator. It is constructed by capacitors of 45 nF and 28.13 nF in the coupling column and capacitors of 18.75 nF in the smoothing column. Working status of the rectifier in high power output condition was analyzed, and the conduction angle of the rectifier was calculated. The power factor (PF) of the SCW circuit has been studied, and the equivalent condensance of the circuit has been derived. Measurements were done for the PF compensation.more » The surge impact during the short circuit transient process was considered in choosing the protection resistance. Test results showed that design specifications of the power supply were achieved, with the non-load voltage being up to 1.32 MV and the ratio of ripple voltage to output voltage as 9.4%.« less
  • Purpose: Non-ionizing radiation therapy for cancer using pulsed electric field with high intensity field has become an interesting field new research topic. A new method using nanosecond pulsed electric fields (nsPEFs) offers a novel means to treat cancer. Not like the conventional electroporation, nsPEFs able to create nanopores in all membranes of the cell, including membrane in cell organelles, like mitochondria and nucleus. NsPEFs will promote cell death in several cell types, including cancer cell by apoptosis mechanism. NsPEFs will use pulse with intensity of electric field higher than conventional electroporation, between 20–100 kV/cm and with shorter duration of pulsemore » than conventional electroporation. NsPEFs requires a generator to produce high voltage pulse and to achieve high intensity electric field with proper pulse width. However, manufacturing cost for creating generator that generates a high voltage with short duration for nsPEFs purposes is highly expensive. Hence, the aim of this research is to obtain the low cost generator design that is able to produce a high voltage pulse with nanosecond width and will be used for nsPEFs purposes. Method: Cockcroft-Walton multiplier circuit will boost the input of 220 volt AC into high voltage DC around 1500 volt and it will be combined by a series of power MOSFET as a fast switch to obtain a high voltage with nanosecond pulse width. The motivation using Cockcroft-Walton multiplier is to acquire a low-cost high voltage DC generator; it will use capacitors and diodes arranged like a step. Power MOSFET connected in series is used as voltage divider to share the high voltage in order not to damage them. Results: This design is expected to acquire a low-cost generator that can achieve the high voltage pulse in amount of −1.5 kV with falltime 3 ns and risetime 15 ns into a 50Ω load that will be used for nsPEFs purposes. Further detailed on the circuit design will be explained at presentation.« less
  • S>Monoenergetic neutrons at 2.5 Mev were produced by bombarding a target of frozen D/sub 2/O with high energy deuterons from a 250 kv Cockcroft-Walton accelerator. At a deuteron energy of 190 kv and a deuteron current of 250 mu A, a neutron source equivalent to 8.2 g Ra--Be was obtarned. The average yield was 0.52 x 10/sup 6/ neutrons/sec/ mu A. The setup is described in detail with the aid of diagrams. A graph showing the relation between neutron production and its equivalence to Ra-- Be in gas a function of deuteron energy is given. (TTT)