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SC Material Testing Facility

1.SC Material testing facility

Scientific objectives:

Ÿ  Master the intrinsicphysical properties and operation behavior of superconducting and structuralmaterials for superconducting magnets in complex and extreme environments.

Ÿ  Study the mechanism of ACloss of superconducting wires and cables.

Ÿ  Study the flowcharacteristics of supercritical helium in CICC and the heat transfercharacteristics in steady and transient state.

Ÿ  Develop the NDE methodfor volumetric defects inspection in the abnormal and complicated material.

SystemDescription and main parameters:

The SC Materialtesting facility consists of the following systems as shown in Fig. 1.


Systemcomposition of the SC Material testing facility

Superconducting material performance researchplatform is to explore the critical current andmicro-mechanism for the superconducting wires/tapes under variable temperature,magnetic field, mechanical loading, etc. The platform mainly consists ofbackground field magnet system, intelligent helium cycling system, power supplywith high accuracy, critical performance test sample holders, micrometer-scalecharacteristics test facility, data acquisition and controlling system. Themain parameters are as follows:

(a) Backgroundmagnetic field is 0-19 T and the inner bore is larger than Φ70mm.

(b) Sampletesting temperature is 4-80 K with stability of ±0.02 K at 4-20 K and ±0.1 K at20-80 K.

(c) Appliedaxial strain to the sample is -1%~1%.

(d) Sampletesting current is 0-2000 A with accuracy better than 0.1%.

ACLoss research platform is to study the mechanism of hysteresis loss, coupling loss and eddy currentloss of superconducting magnet and sub-elements and to study influence ofheating energy power from AC loss on superconducting magnet system underdifferent operation conditions. The main parameters of this testplatform are:

(a) Testaperture is 550 (length) ×120(width) × 80 (Height) mm.

(b) Max.mechanical load is 1500 kN/m.

(c) Amplitudeof AC magnetic field is 0.5 T.

(d) Frequencyof AC magnetic field is 0.01~0.2 Hz.

(e)Measurement accuracy of AC loss is better than ± 2%.

Structure materialperformance research platform iscomposed of the static loading facility and the dynamic loading facility. Thetwo facilities are both composed of host and control system, cryogenic system,high temperature control system, data acquisition system and specimen holder.The static loading facility is designed and built for stress vs strainperformance evaluation for structural materials under tension, compression andbending loads. The dynamic loading system shall be designed and built forfatigue crack growth initiation and propagation characteristics evaluation ofstructural materials with different defects existed inside and under differentoperation conditions. The main parameters of this test platform are:

(a) Maximumload is ± 2500 kN for the static loading system.

(b) Maximumload is ± 100 kN for the dynamic loading system.

(c) Testingtemperature is from 4.2 K to 1273 K.

Thermo-hydraulicresearch platform ismainly used to research the significant thermal hydraulic characteristicsinclude friction factor, helium flow distribution, the temperature and pressurevariation according to the current charging operations. The platform mainlyconsists of refrigerator, cryostat, power supplier, HTS current leads, vacuum system,and data acquisition system. The main parameters of the thermal hydraulicresearch platform are:

(a) Vacuumvessel dimension is 3 (height) × Φ2.5 m.

(b) Testtemperature is 3.8-300 K.

(c) SHe pressureis 3-6 bar.

(d) SHe flowis larger than 20 g/s.

NDE technology researchplatform, is constructed to studythe acoustic wave transmission mechanism in complex structural materials anddevelop the NDE method for volumetric defects inspection in the abnormal andcomplicated material. The platform consists of numerical simulation platform,acoustic technology test platform, X-ray technology test platform andelectromagnetic technology test platform. The main parameters of this testplatform are:

(a) Phasedarray is with 16~128 elements.

(b) Testfrequency is 0.25 - 32 MHz.

(c) Max. X-rayvoltage is 350 kV.

Highvoltage research platform, is mainly used to carry out the insulationelectrical test and research of superconducting components under the operationconditions of future fusion reactors. The high voltage test facility consists of the resistivity test device,dielectric performance test device, partial discharge test device, AC/DCwithstand voltage test device, paschen discharge test device and thermalexpansion coefficient test device. The main parameters of this testplatform are:

(a) Testvoltage is 0 to 100kV.

(b) Testpressure is 0.01 to10000Pa.

(c) Testtemperature 4.2 K to 300K.


KeyTechnologies

The following key technologies isexpected to be solved by constructing the SC Material testing facility:

Ÿ  The development of 19Thybrid superconducting magnet.

Ÿ  The design andconstruction of the multifunctional critical current characterization sampleholders.

Ÿ  Precise control of theverticality and radial deviation of the loading system under multiple cyclicconditions for AC loss measurement.

Ÿ  Measurement technology ofsupercritical helium flow and heat transfer characteristics in porous media.

Ÿ  The establishment ofmulti-media and complex structural parts simulation calculation model for NDE.