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Choi, Jae-Hoon,Lee, Dong-Keun,Kim, Chang-Hwan,Jin, Jong-Kook,Han, Sang-Hee,Kong, Jong-Dae,Hong, Seong-Lok,Kim, Yang-Su,Kwon, Myeun,Ahn, Hyun-Sik,Jang, Gye-Yong,Yun, Min-Seong,Seong, Dae-Kyung,Shin, Hy The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7 pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and $2^{nd}$ plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the $2^{nd}$ plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.
Jae-Hoon Choi,Dong-Keun Lee,Chang-Hwan Kim,Jong-kook Jin,Sang-Hee Han,Jong-Dae Kong,Seong-Lok Hong,Yang-Su Kim,Myeun Kwon,Hyun-Sik Ahn,Gye-Yong Jang,Min-Seong Yun,Dae-Kyung Seong,Hyun-Seok Shin 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7 pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and 2<SUP>nd</SUP> plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the 2<SUP>nd</SUP> plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.
Superconducting Magnet Power Supply System for the KSTAR 2nd Plasma Experiment and Operation
JAE HOON CHOI,DONG KEUN LEE,CHANG HWAN KIM,Jong-kook Jin,Sang-Hee Han,JONG DAE KONG,SEONG LOK HONG,Yang-Su Kim,MYEUN KWON,Hyun-sik Ahn,Gye-yong Jang,Min-seong Yun,Dae-Kyung Seong,Hyun-seok Shin 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and 2nd plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the 2nd plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.
SOME RESULTS RELATED WITH POISSON-SZEGÄO KERNEL AND BEREZIN TRANSFORM
Gye Tak Yang,Ki Seong Choi 충청수학회 2011 충청수학회지 Vol.25 No.3
Let ¹ be a ¯nite positive Borel measure on the unit ball B ½ Cn and º be the Euclidean volume measure such that º(B) = 1. For the unit sphere S = fz : jzj = 1g, ¾ is the rotation-invariant measure on S such that ¾(S) = 1. Let P[f] be the Poisson-SzegÄo integral of f and ~¹ be the Berezin transform of ¹. R this paper, we show that if there is a constant M > 0 such that B jP[f](z)jpd¹(z) · M R B jP[f](z)jpdº(z) for all f 2 Lp(¾), then k ~¹ k1´ supz2B R j¹~(z)j < 1; and we show that if k ¹~ k1< 1; thenB jP[f](z)jpd¹(z) · C k ~¹ k1 RS jf(³)jpd¾(³) for some constantC.
INTEGRAL REPRESENTATION OF SOME BLOCH TYPE FUNCTIONS IN ℂ<SUP>n</SUP>
Choi, Ki Seong,Yang, Gye Tak 충청수학회 1997 충청수학회지 Vol.10 No.1
Let B be the open unit ball in the complex space $\mathbb{C}^n$. A holomorphic function $f:B{\rightarrow}C$ which satisfies sup{(1- <z, z> ${\parallel}\;{\nabla}_zf\;{\parallel}\;{\mid}z{\in}B$} < $+{\infty}$ is called Bloch type function. In this paper, we will find some integral representation of Bloch type functions.
NOTES ON ??-BLOCH SPACE AND Dp(¹)
Gye Tak Yang,Ki Seong Choi 충청수학회 2012 충청수학회지 Vol.25 No.3
In this paper, we will show that if ¹ is a Borel measure on the unit disk D such that R D d¹(z) (1¡jzj2)p?? < 1where 0 < ??; p < 1, then a bounded sequence of functions ffng in the ??-Bloch space B?? has a convergent subsequence in the space Dp(¹) of analytic functions f on D satisfying f0 2 Lp(D; ¹). Also, we will ¯nd some conditions such that RDd¹(z) (1¡jzj2)p < 1.
OPERATORS ON GENERALIZED BLOCH SPACE
CHOI, KI SEONG,YANG, GYE TAK 한국수학교육학회 1998 純粹 및 應用數學 Vol.5 No.1
In [5], Zhu introduces a bounded operator T from L^∞(D) into Bloch space B. In this paper, we will consider the generalized Bloch spaces B_q and find bounded operator from L^∞(D) into B_q.
Bochner Integrability Of Functions On a Product Space
Choi, Ki Seong,Yang, Gye Tak 建陽大學校 1997 建陽論叢 Vol.- No.5
Let H be a complex-valued measurable function on a product space. We will find some conditions of H such that [H(y, ·)] is Bochner integrable.
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.
THE EXISTENCE THEOREM OF THE GENERALIZED ANALYTIC OPERATOR-VALUED FEYNMAN INTEGRAL
Choi, Ki Seong,Yang, Gye Tak 충청수학회 1996 충청수학회지 Vol.9 No.1
We will investigate conditions of smooth measure ${\mu}$ for which analytic operator-valued Feynman integral associated with ${\mu}$ exist.