Current status of the KSTAR construction

An assessment of axial pre-compression for the KSTAR central solenoid

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.

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

The central solenoid (CS) magnet system of the KSTAR consists of four pairs of superconducting coils which are stacked with up-down symmetry and supporting structures which can give pre-compression in a vertical direction on the coil stack to sustain the contact between coils. The CS system of the KSTAR was mechanically preloaded with about 7.3 MN at room temperature by preloading structure in order to preserve the structural stability from thermal and electromagnetic loads which can make coil stack misaligned. It has been shown that the CS system stably operated in terms of mechanical behavior during seven thermal cycles from 300 K to 4.5 K and its peak coil current of 9 kA per turn for plasma operation until 2014. However, the performance test of the CS coils at a higher coil current was required for a long pulse operation. In 2014, the CS coils were successfully charged up to its current of 15 kA per turn step by step during the comprehensive commissioning of the KSTAR Motor Generator (MG) system whose peak power is 200 MVA compared with 100 MVA of available grid power. The adverse effect on the structural stability of the CS system was not found although the axial compressive force preloaded on the CS system was gradually released due to the attractive force between the coils which can make coil stack contracted according to the increase in coil current. This paper describes the effect of the CS coil current on the mechanical behavior of the KSTAR CS system as well as the results of the variation of compressive force according to the coil current.

http://ieeexplore.ieee.org/iel7/7479906/7482255/07482373.pdf

Mechanical behavior of the KSTAR central solenoid preloading structure according to the coil current

Status of the KSTAR Tokamak Construction

Structural Design of the KSTAR Central Solenoid Structure

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Structural Design of the KSTAR Central Solenoid Structure