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Design and Test Results of High-Power Pulse Generator System for Industrial Accelerator Application
S. D. Jang(장성덕),S. H. Kim(김상훈),H. Y. Yang(양해룡),M. H. Cho(조무현),I. S. Ko(고인수),W. Namkung(남궁원) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A conventional linear accelerator system requires a flat-topped pulse with less than ± 0.5% ripple to meet the beam energy spread requirements and to improve pulse efficiency of RF systems. A a line-type pulsed modulator is widely used in pulsed power circuits for applications such as accelerators, radar, medical radiation, or ionization systems. The high-voltage pulse generator system with an output voltage of 284 ㎸, a pulse width of 10 ㎲, and a rise time of 0.84 ㎲ has been designed and fabricated to drive a klystron which has 30-㎿ peak and 60-kW average RF output power. The high-voltage test was performed using the klystron load. This thesis describes the design and test results of high-power pulse generator system for industrial accelerator application. The experimental results were analyzed and compared with the design.
산업용 선형가속기 시스템 적용을 위한 30MW 클라이스트론용 고 평균전력 펄스 트랜스포머의 설계
장성덕(S. D. Jang),손윤규(Y. G. Son),권세진,오종석(J. S. Oh),문성익(S. I. Moon),김상호,조무현(M. H. Cho),남궁원(W. Namkung),Y. S. Bae,H. G. Lee 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
An L-band linear accelerator system for e-beam sterilization is under design for bio-technology application. The klystron-modulator system as RF microwave source has an important role as major components to offer the system reliability for long time steady state operation. A PFN line type pulse generator with a peak power of 71.5-㎿, 7 ㎲, 285 pps is required to drive a high-power klystron. The high power pulse transformer has a function of transferring pulse energy from a pulsed power source to a high power load. The pulse transformer producing a pulse with a peak voltage of 275 ㎸ is required to produce 30-㎿ peak and 60 ㎾ average RF output power at the frequency of 1.3-㎓. We have designed the high power pulse transformer with 1:13 step-up ratio. The peak and average power capability is 71.5-㎿ (275 ㎸, 260 A at load side with 7 ㎲ pulse width) and 130 ㎾, respectively. In this paper, we present a system overview and initial design results of the high power pulse transformer.
Pulsed Nonthermal Plasma Processing for Industrial DeNOx/DeSOx Control
장성덕(S. D. Jang),조무현(M. H. Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Pulsed corona induced plasma chemical process (PPCP) can be applied to the removal of pollutant gases from industrial plants such as power generation plants and incinerators. A PPCP unit, one of the world's largest scales of PPCP, has been tested for the simultaneous removal of NO<SUB>x</SUB> and SO₂ from the flue gas emission at an industrial incinerator with the gas flow rate of 42,000 N㎥/h. An average 120 ㎾ modulator using a magnetic-pulse-compression (MPC) switch is used to generate the nanopulse for corona induction. It was observed that the PPCP made significant NO<SUB>x</SUB> and SO₂ conversion with reasonable electric power consumption. NO removal efficiency was significantly improved by injecting a C₃H? additive. In this experiment, the removal efficiencies of SO₂ and NO<SUB>x</SUB> were analyzed by approximately 95% and 60%, respectively. The specific energy consumption during the normal operation was approximately 1.4 Wh/㎥ with the PPCP.
장성만(S. M. Jang),김석환(S. W. Kim),한송엽(S. Y. Hahn),정현교(H. K. Jung) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
This paper describes the energy and speed characteristics of an induction coil-gun. The coil-gun has some merits that it can be easily installed and repeatedly used many times, it does not damage mechanically in the course of launch and the force exerted on the projectile is distributed uniformly. An equivalent circuit is employed for modeling the coil-gun. The circuit equations and equation of motion are then derived based on the equivalent circuit. These equations are solved numerically by using Runge-Kutta method. Finally the energy transfer ratios are obtained according to the variations of the resonant frequency of driving circuit and charging voltage of capacitors. The muzzle velocities of projectile are also obtained according to the variations of electrical conductivity and initial position of projectile, firing angle of driving circuit, charging voltage of capacitor and resistance of driving coil, respectively.