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Development of a Dual-pulse RF Driver for an S-band (= 2856 MHz) RF Electron Linear Accelerator
Sungsu Cha,김유종,Byeong-No Lee,Byung Cheol Lee,Hyungki Cha,Jang Ho Ha,박형달,Seung Hyun Lee,Hui Su Kim,Pikad Buaphad 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.8
The radiation equipment research division of Korea Atomic Energy Research Institute has developed a Container Inspection System (CIS) using a Radio Frequency (RF) electron linear accelerator for port security. The primary purpose of the CIS is to detect nuclear materials and explosives, as well country-specific prohibited substances, e.g., smuggled. The CIS consists of a 9/6 MeV dualenergy electron linear accelerator for distinguishing between organic and inorganic materials. The accelerator consists of an electron gun, an RF accelerating structure, an RF driver, a modulator, electromagnets, a cooling system, a X-ray generating target, X-ray collimator, a detector, and a container moving system. The RF driver is an important part of the configuration because it is the RF power source: it supplies the RF power to the accelerating structure. A unique aspect of the RF driver is that it generates dual RF power to generate dual energy (9/6 MeV). The advantage of this RF driver is that it can allow the pulse width to vary and can be used to obtain a wide range of energy output, and pulse repetition rates up to 300 Hz. For this reason, 140 W (5 MW − 9 MeV) and 37 W (3.4 MW − 6 MeV) power outputs are available independently. A high power test for 20 minutes demonstrate that stable dual output powers can be generated. Moreover, the dual power can be applied to the accelerator which has stable accelerator operation. In this paper, the design, fabrication and high power test of the RF driver for the RF electron linear accelerator (linac) are presented.
Sungsu Cha,Yujong Kim,Jinsik Ju,Youngwoo Joo,Byeong-No Lee,Soo Min Lee,Jae Hyun Kim,Pikad Buaphad,Byung Cheol Lee,Hyungki Cha,Jang Ho Ha,Hyung Dal Park,Ki Beak Song,Seung Hyun Lee,Heesoo Kim 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
The Korea Atomic Energy Research Institute (KAERI) has been developing a Container Inspection System (CIS) by using a dual-energy (9/6 MeV) S-band (= 2856 MHz) electron linear accelerator. The key components of the CIS are the electron linear accelerator (including an electron gun, an accelerating structure, an RF power source, cooling chillers, vacuum pumps, magnet power supplies, and two solenoid magnets with beam focusing and shielding functions), a tungsten target for X-ray generation, an X-ray collimator, a detector array, and a container moving system. Generally, in accelerators, beam focusing is mainly done by solenoids operating in the region of a few MeV to keep the shape of transverse beam symmetrically round so as to reduce the loss of electrons, which increases the beam current and the beam power. In addition, a specially-designed component is needed to protect against the radiation due to the lost electrons. In this paper, we describe the design, fabrication, and optimization of two specially- designed solenoids with focusing and radiation shielding functions for a dual-energy S-band electron linear accelerator for a CIS.
에어백 폴딩 방법과 하우징 재질 변경에 따른 조수석 에어백과 주변 구조물의 해석적 방법에 의한 거동 비교
차현탁(Hyuntack Cha),한성수(Sungsu Han),정동훈(Donghun Chung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
지금까지의 에어백 관련 해석은 에어백과 더미(Dummy)사이의 접촉 후 발생하는 승객 상해치를 예측 내지 확인하는 작업이 주류를 이루었다. 본 논문에서는 기존의 문제 보다 선행하여 발생하는 에어백과 주변 구조물과의 접촉 및 그 영향을 평가하는 작업을 유한요소 모델을 이용한 수치 해석 작업을 수행하였다. 이를 위하여 총 세 가지의 각기 다른 방법으로 접힌 조수석 에어백(Passenger-side Airbag)모델을 제작하여 해석을 수행함으로써 폴딩 방법 변경에 따른 에어백과 에어백 하우징의 변형(Bell-mouth 문제)을 비교하였으며, 하우징 재질 변경에 따른 거동 변화도 확인하였다.