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CONSTRUCTION, ASSEMBLY AND COMMISSIONING OF KSTAR MAIN STRUCTURES
HYUNG-LYEOL YANG,JOO-SHIK BAKa,BYUNG-CHUL KIM,CHANG-HO CHOI,WOONG-CHAE KIM,NAM-IL HER,KWON-HEE HONG,GEUNG-HONG KIM,HAK-KUN KIM,JEONG-WOO SA,HONG-TACK KIM,KYUNG-MIN KIM,SANG-TAE KIM,DONG-JIN KIM,KWANG- 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.6
The KSTAR device succeeded in first plasma generation on 13th June of 2008 through comprehensive system test and commissioning. Among various kinds of the key factors that decisively affected the project, success in the construction and assembly of the major tokamak structure was most important one. Every engineering aspects of each structure were finally confirmed in the integrated commissioning period, and there were no severe troubles and failures prevented the KSTAR device from operating during the commissioning and the first plasma experiments. As a result, all of the experiences and technologies achieved through the KSTAR construction process are expected to be important fundamentals for future construction projects of superconducting fusion devices. This paper summarizes key engineering features of the major structures and of the machine assembly.
CONSTRUCTION, ASSEMBLY AND COMMISSIONING OF KSTAR MAIN STRUCTURES
Yang, Hyung-Lyeol,Bak, Joo-Shik,Kim, Byung-Chul,Choi, Chang-Ho,Kim, Woong-Chae,Her, Nam-Il,Hong, Kwon-Hee,Kim, Geung-Hong,Kim, Hak-Kun,Sa, Jeong-Woo,Kim, Hong-Tack,Kim, Kyung-Min,Kim, Sang-Tae Korean Nuclear Society 2008 Nuclear Engineering and Technology Vol.40 No.6
The KSTAR device succeeded in first plasma generation on $13^{th}$ June of 2008 through comprehensive system test and commissioning. Among various kinds of the key factors that decisively affected the project, success in the construction and assembly of the major tokamak structure was most important one. Every engineering aspects of each structure were finally confirmed in the integrated commissioning period, and there were no severe troubles and failures prevented the KSTAR device from operating during the commissioning and the first plasma experiments. As a result, all of the experiences and technologies achieved through the KSTAR construction process are expected to be important fundamentals for future construction projects of superconducting fusion devices. This paper summarizes key engineering features of the major structures and of the machine assembly.
OVERVIEW OF SUPERCONDUCTING MAGNET POWER SUPPLY SYSTEM FOR THE KSTAR 1ST PLASMA EXPERIMENT
JAE HOON CHOI,HYUNG LYEOL YANG,HYUN SIK AHN,GYEYONG JANG,DONG KEUN LEE,KUK HEE KIM,SANG HEE HAHN,CHANG HWAN KIM,JAE SIC HONG,YONG CHU,JONG DAE KONG,SEONG LOK HONG,IN SUNG HWANG,MIN SEONG YUN,DAE KYUNG 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.6
The KSTAR Magnet Power Supply (MPS) was dedicated to the SC coil commissioning and 1st plasma experiment as a part of the system commissioning. Although many efforts to develop large-current power supplies that are useful for high power electronic devices have been made in various application fields, such as for large metal-plating devices, there were clear discrepancies between conventional power supply technologies and that for the SC coils due to the special SC coil load conditions. Therefore, most of the power supply technologies for the SC coils were a challenge in the domestic research area due to their limited application. However, the MPS commissioning result showed that all of the hardware and controlling software operated well, and this result finally led to the success of SC coil commissioning and the KSTAR 1st plasma experiment. This paper will describe key features of KSTAR MPS for the 1st plasma experiment, and will also report the commissioning results of the magnet power supplies.
Choi, Jae-Hoon,Yang, Hyung-Lyeol,Ahn, Hyun-Sik,Jang, Gye-Yong,Lee, Dong-Keun,Kim, Kuk-Hee,Hahn, Sang-Hee,Kim, Chang-Hwan,Hong, Jae-Sic,Chu, Yong,Kong, Jong-Dae,Hong, Seong-Lok,Hwang, In-Sung Korean Nuclear Society 2008 Nuclear Engineering and Technology Vol.40 No.6
The KSTAR Magnet Power Supply (MPS) was dedicated to the SC coil commissioning and $1^{st}$ plasma experiment as a part of the system commissioning. Although many efforts to develop large-current power supplies that are useful for high power electronic devices have been made in various application fields, such as for large metal-plating devices, there were clear discrepancies between conventional power supply technologies and that for the SC coils due to the special SC coil load conditions. Therefore, most of the power supply technologies for the SC coils were a challenge in the domestic research area due to their limited application. However, the MPS commissioning result showed that all of the hardware and controlling software operated well, and this result finally led to the success of SC coil commissioning and the KSTAR $1^{st}$ plasma experiment. This paper will describe key features of KSTAR MPS for the $1^{st}$ plasma experiment, and will also report the commissioning results of the magnet power supplies.
김근홍(Geun-Hong Kim),이영신(Young-Shin Lee),양형렬(Hyung-Lyeol Yang) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.4
금속씰의 탄성복원력은 기밀성능을 결정하는 매우 중요한 요소이다. 본 연구는 장시간 운전조건에서 기밀성능을 유지할 수 있는 금속오링씰의 구조, 즉 탄성복원력이 우수한 구조를 얻기 위하여 컴플라이언트 메커니즘 위상최적화법을 도입하였다. 진화구조최적화법의 위상최적화 알고리듬이 사용되었으며, 강성 및 유연성을 동시에 고려하는 두 가지 종류의 목적함수가 사용되었다. 금속오링씰의 외형을 고려하여 원형의 최적화 설계영역이 고려되었으며 최적화 결과로 나타난 위상의 탄성복원력은 상용품의 탄성복원력과 비교되었다. The elastic recovery of a metal seal is a factor that can be used to assess its sealing performance. In this study, a compliant mechanism topology optimization has been performed to find a structure of a metal O-ring seal that can maintain excellent sealing performance with a maximized elastic recovery over extended operation. An evolutionary structural optimization (ESO) was used as a topology optimization algorithm with two different types of objective functions considering both flexibility and stiffness. In particular, a circular design domain was adopted to consider the outer shape of the metal O-ring seal. The elastic recovery of the optimal topology was calculated and compared to that of a commercial product.
Arc Discharge Characteristics of a Long Pulse Ion Source for the KSTAR Neutral Beam Injector
장두희,정승호,진정태,Dae-Sik Chang,김태성,이광원,인상렬,오병훈,배영순,김종수,박영민,Hyung-Lyeol Yang 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
A long pulse ion source (LPIS) for the neutral beam injector (NBI) has been developed for the Korea Superconducting Tokamak Advanced Research (KSTAR) superconducting tokamak. The arc discharge characteristics of the ion source were investigated on the first KSTAR neutral beam injector (NBI-1). The ion source consists of a magnetic bucket plasma generator with multi-pole cusp fields and a set of prototype tetrode accelerators with circular apertures. The inner volume of the plasma generator in the LPIS ion source is approximately 47.2 liters. Design requirements for the ion source were a 120 kV/65A deuterium beam and a 300 s pulse length. Arc discharges of the plasma generator with deuterium gases have been controlled by using the space charge-limited mode and have been operated by using a sufficient heating voltage on the cathode filaments. Stable and efficient arc plasmas up to an arc power of 70 kW have been produced by using a constantpower-mode operation of the arc power supply. The reliable operation region of the arc discharges has been investigated for various filament heating voltages, arc powers, and amounts of injected deuterium gas in the LPIS.
Performance of 300 s-beam extraction in the KSTAR neutral beam injector
Chang, Doo-Hee,Jeong, Seung Ho,Kim, Tae-Seong,Lee, Kwang Won,In, Sang Ryul,Bae, Young-Soon,Kim, Jong-Su,Park, Hyun-Taek,Kim, Dong-Hyun,Yang, Hyung-Lyeol Elsevier 2012 Current Applied Physics Vol.12 No.4
<P><B>Abstract</B></P><P>The first neutral beam injector (NBI-1) has been developed for the Korea Superconducting Tokamak Advanced Research (KSTAR) tokamak. The first long pulse ion source (LPIS-1) has been installed in the NBI-1 for an auxiliary heating and current drive of KSTAR plasmas. The performance of 300 s ion beam extraction in the LPIS-1 was investigated on the KSTAR NBI-1 system, prior to the neutral beam injection for long pulse operation. The ion source consists of a magnetic bucket plasma generator with multi-pole cusp fields and a set of prototype tetrode accelerators with circular-type apertures. The inner volume of the plasma generator and accelerator column in the LPIS-1 is approximately 123 L. The nominal operation requirements for the ion source (IS) were a 100 kV/50 A deuterium beam and a 300 s pulse length. The extraction of ion beams was initiated by the formation of arc plasmas in the LPIS-1, called an arc-beam extraction method. A stable ion beam extraction of the LPIS-1 was achieved with 80 kV/27 A and a beam perveance of 1.19 microperv for a 300 s pulse length. Beam power deposition along the NBI-1 has been measured using water-flow calorimetry (WFC), and the sum of the deposited power on the ion source and beamline components was about 93% of the drained acceleration power (V<SUB>acc</SUB>•I<SUB>acc</SUB>). The beam power deposition was compared to the calculated results of the beam transport with re-ionization (BTR) code.</P>
CURRENT STATUS OF NUCLEAR FUSION ENERGY RESEARCH IN KOREA
MYEUN KWON,YOUNG SOON BAE,SEUNGYON CHO,최원호,홍봉근,황용석,JIN YONG KIM,KEEMAN KIM,YAUNG-SOO KIM,JONG-GU KWAK,HYEON GON LEE,SANGIL LEE1,나용수,BYUNG-HOON OH,YEONG-KOOK OH,박지연,HYUNG LYEOL YANG,IN KEUN YU 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.4
The history of nuclear fusion research in Korea is rather short compared to that of advanced countries. However, since the mid- 1990s, at which time the construction of KSTAR was about to commence, fusion research in Korea has been actively carried out in a wide range of areas, from basic plasma physics to fusion reactor design. The flourishing of fusion research partly owes to the fact that industrial technologies in Korea including those related to the nuclear field have been fully matured, with their quality being highly ranked in the world. Successive pivotal programs such as KSTAR and ITER have provided diverse opportunities to address new scientific and technological problems in fusion as well as to draw young researchers into related fields. The frame of the Korean nuclear fusion program is now changing from a small laboratory scale to a large national agenda. Coordinated strategies from different views and a holistic approach are necessary in order to achieve optimal efficiency and effectiveness. Upon this background, the present paper reflects upon the road taken to arrive at this point and looks ahead at the coming future in nuclear fusion research activities in Korea.