Electromagnetic loads on the KSTAR magnet system

Choi, Changho; Lee, D.K.; Sa, J.W.; Ahn, Hyun-Joo; Oh, Y.K.; You, K.-I.; Kim, J.Y.; Cho, S.

doi:10.1109/tasc.2002.1018460

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…The major functions of the CS structure are both a mechanical support and the pre-compression of ~15 MN 18) . The peak stress including pre-compression is ~500 MPa at the neck part of the inner shell during operation.…”

Section: Magnet Structurementioning

confidence: 99%

Status of the KSTAR Project

KIM

Bak

et al. 2006

TEION KOGAKU

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Project is to develop a steady-state-capable advanced superconducting tokamak for establishing a scientific and technological basis for an attractive fusion reactor. Since the KSTAR mission includes the achievement of a steady-state-capable operation, the use of superconducting coils is an obvious choice for the magnet system and the long pulse current drive and heating systems are also the important aspect of the KSTAR design features. The advanced tokamak aspect of the mission is incorporated in the design features associated with flexible plasma shaping, double-null divertor and passive stabilizer, internal control coils. All the major components are in the stage of the fabrication and assembly for the completion of the KSTAR construction in the year 2007.

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Section: Magnet Structurementioning

confidence: 99%

Status of the KSTAR Project

KIM

Bak

et al. 2006

TEION KOGAKU

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“…However, the peak separation force of 12 MN occurs between PF1 and PF2 coils under several operation conditions. The condition is called as maximum repulsive force (MRF) condition [7], [8]. The designed axial compression of 15 MN at 5 K will be applied partly by assembling the preload structure at room temperature with preload of about 13.4 MN and partly by the thermal contraction difference between CS coils and preload structure during cool down [9].…”

Section: Cs Structurementioning

confidence: 99%

“…The support lug, which is beam-shaped and segmented with insulation, transfers the gravity weight of 21 tons and vertical magnetic force of the CS coils to the TF structure. The peak vertical launching force of the CS magnet system is calculated to be about 2.3 MN at plasma vertical disruption condition [7]. There are eight flexible joints to accommodate the relative radial displacement between the CS and TF magnet systems, which comes from system cool-down and from TF magnet system deformation by in-plane and out-of-plane magnetic forces [11].…”

Section: Cs Structurementioning

confidence: 99%

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Engineering design status of the KSTAR central solenoid structure

Choi

et al. 2002

IEEE Trans. Appl. Supercond.

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The central solenoid (CS) magnet system of the Korea Superconducting Tokamak Advanced Research (KSTAR) device consists of four pairs of segmented CS coils and a CS coil structure. The maximum repulsive force between CS coils is about 12 MN. The functions of the CS structure are to apply preload on the CS coils and to support the repulsive force between CS coils during operation. The designed axial compression of 15 MN at 4.5 K will be applied partly by assembling the preload structure at room temperature with preload of about 13.4 MN and partly by the thermal contraction difference between the CS coils and the structure during cool down. Additional preload will be given by minute adjustment of wedges. The structural analysis of the CS magnet system has been performed to verify the CS structure design reliability.

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“…The most important function of CS structures is to protect CS coils from electromagnetic and thermal loads. Specifically, the structures should sustain the high magnetic forces such as hoop forces, vertical attractive and repulsive forces, and lateral forces [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of the KSTAR Central Solenoid Coil Structure During Thermal Cycles

Kim

et al. 2012

IEEE Trans. Appl. Supercond.

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The central solenoid (CS) coil system of the KSTAR device consists of four pairs of coils with up-down symmetry and a set of support structure. The CS coil system should endure various loads including thermal and electromagnetic load during operation. One of the most important roles of support structure is to preserve the structural stability of coil system from vertical forces by applying the pre-compression on the coil stack. The main assembly procedure of the coil stack is as follows: 1) coil subassembly and stacking, 2) structure assembly, 3) preloading process by heating shells in the support structure, and 4) measurement on the final dimension. The special jigs and heating system for the preloading were designed to apply pre-compression on the coil stack during the assembly at room temperature. Moreover, a few tens of thermocouples and strain gauges were installed for measuring temperature and thermal expansion of preloading structures. Since the final assembly of the CS coil was successfully completed with about 7.3 MN of preloading in 2006, the CS coil system has been experienced four thermal cycles from 300 K to 5 K until 2011. This paper describes the main results of applying the pre-compression on the coil stack and mechanical behaviors of preloading structures during thermal cycles.

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Electromagnetic loads on the KSTAR magnet system

Cited by 16 publications

References 9 publications

Status of the KSTAR Project

Status of the KSTAR Project

Engineering design status of the KSTAR central solenoid structure

Mechanical Behavior of the KSTAR Central Solenoid Coil Structure During Thermal Cycles

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