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K o r e a S u p e r c o n d u c t i n g T o k a m a k A d v a n c e d R e s e a r c h
The Results of the KSTAR Superconducting Coil TestThe Results of the KSTAR Superconducting Coil Test
Nov. 5 2004
Presented by Yeong-KooK Oh Y. K. Oh, Y. Chu, S. Lee, S. J. Lee, S. Baek, J. S. Kim, K. W. Cho,
H. Yonekawa, Y. Chang, K. R. Park, W. Chung, S. H. Lee, S. H. Park, I. S. Woo, N. Song, K. P. Kim, Y. J. Song, H. Park,
Y. M. Park, Y. S. Kim, S. W. Kwag, Y. J. Lee, H. S. Chang, M. K. Kim, K. Kim, J. S. Bak, G. S. Lee, and the KSTAR Team
National Fusion R&D CenterKorea Basic Science Institute
Nov. 5 2004
Presented by Yeong-KooK Oh Y. K. Oh, Y. Chu, S. Lee, S. J. Lee, S. Baek, J. S. Kim, K. W. Cho,
H. Yonekawa, Y. Chang, K. R. Park, W. Chung, S. H. Lee, S. H. Park, I. S. Woo, N. Song, K. P. Kim, Y. J. Song, H. Park,
Y. M. Park, Y. S. Kim, S. W. Kwag, Y. J. Lee, H. S. Chang, M. K. Kim, K. Kim, J. S. Bak, G. S. Lee, and the KSTAR Team
National Fusion R&D CenterKorea Basic Science Institute
Ykoh@kbsi.re.krYkoh@kbsi.re.kr
Contents
KSTAR Project Overview
SC Coil Test Program Overview
Prototype TF Coil Test
CS Model Coil Test
Other Test Activities
Summary and Future Works
KSTAR Device• Korea Superconducting Tokamak Advanced Research• Assembly finish milestone on 2007• Major components : Vacuum vessel, Cryostat, TF SC coils, PF SC coils, and
Magnet structures
CryostatCryostat
MagnetStructureMagnet
Structure
TF CoilsTF Coils
PF CoilsPF Coils
VacuumVessel
VacuumVessel
KSTAR Device & Major Components
9 m
10 m
Elevation View of KSTAR
KSTAR Device Assembling Status
Vacuum CryostatVacuum Cryostat
Vacuum Pumping System
Vacuum Pumping SystemPF 6 & 7 CoilsPF 6 & 7 Coils
KSTAR Assembling Tools
KSTAR Assembling Tools
Vacuum VesselVacuum Vessel
Poster Presentation:FT/P7-17
Poster Presentation:FT/P7-17
SC Coil Fabrication Status
• TF Coils5 Completion
WindingWinding
Heat TreatmentHeat Treatment
Insulation TapingInsulation Taping
TF CoilsTF Coils
Winding & TapingWinding & Taping
Ground WrapGround Wrap
PF CoilsPF Coils
VPIVPI
• PF Coils4 Completion
CICCPoster Presentation:
FT/P7-16Poster Presentation:
FT/P7-16
Magnet Structure Fabrication Status
TF00 Coil EncasingTF00 Coil Encasing Final MachiningFinal Machining
Assembly TestAssembly Test
Real Structure FabricationReal Structure Fabrication
Poster Presentation: FT/P7-14
Poster Presentation: FT/P7-14
TF00 CoilTF00 Coil
TF00 StructureTF00 Structure
TF Magnet Structure
SC Coil Test Program Overview
Objectives of the KSTAR SC Coil Test
o To verify the design and manufacturing engineering of the
KSTAR SC coils
o To get the operating characteristics of the SC coils after
cool-down and under current excitation
o To acquire the knowledge of the KSTAR magnet system
commissioning and operation, and
o To test the KSTAR SC magnet interfaces before installation
such as cryogenic sensors, monitoring system, power
supply, and quench detector
SC Coil Test Overall Schedule
Prototype TF Coil Test
Prototype TF Coil Test
TF Coil Engineering & Operation VerificationTF Coil Engineering & Operation Verification 2002 ~ 20032002 ~ 2003
Test Activities Objectives Schedule
CS Model Coil TestCS Model Coil Test CS Coil Operation & Engineering Verification
CS Coil Operation & Engineering Verification 20042004
TF Coil Cool-down, CS Joint,
TF Structure
TF Coil Cool-down, CS Joint,
TF StructureKSTAR Coil Integrity TestKSTAR Coil Integrity Test 2005 ~2005 ~
Coil Acceptance TestCoil Acceptance Test
Dimension CheckPressure & Flow Check
DC Hipot TestAC Hipot TestImpulse Test
SC Strand Jc Measure
Dimension CheckPressure & Flow Check
DC Hipot TestAC Hipot TestImpulse Test
SC Strand Jc Measure
2003 ~ 20062003 ~ 2006
SC Coil Test Facility Layout
Vacuum CryostatVacuum Cryostat
• 6 m (D) x 8 m (H)• Thermal shield (LN2 cooled)• Helium flow distribution• Current lead
Vacuum Pumping System
Vacuum Pumping System
• Diffusion pump• Piston pump & booster pump• Safety valve
Vacuum CryostatVacuum Cryostat
SC Coil Test Facility Layout
Cryogenic Helium Facility
Cryogenic Helium Facility
• 1 kW Helium refrigerator• 140 l/h Helium liquefier• 3000 l LHe dewar• Helium recovery station• LN2 storage
Helium FacilityHelium Facility
SC Coil Test Facility Layout
Power SupplyPower Supply• 35 kA TF power supply (unipolar)• 20 kA PF power supply (bipolar)• 10 kA bipolar
PF Power Supply & DCCTPF Power Supply & DCCT
SC Coil Test Facility Layout
Monitoring SystemMonitoring System• VME• PXI• Quench detector• Vacuum & RGA• Cryogenic monitoring
Monitoring SystemMonitoring System Quench Detector
Prototype TF Coil Test
Prototype TF Coil (TF00 Coil) TestTest Objectives
To verify the design and fabrication procedure of the KSTAR TF coilTo solve the engineering issue in TF coil, void fraction, SAGBO, and jointsCommissioning the SC magnet test facility
Vapor-cooled Current LeadVapor-cooled Current Lead
Coil SupportersCoil Supporters
TF00 Coil & Structure
TF00 Coil & StructureSC Busline &
JointsSC Busline &
Joints
Prototype TF Coil Test Layout
Prototype TF Coil FabricationKSTAR TF Coil Specifications
TF00 Winding Finished on August 2001
56 turnsWinding
148Total weight of TF magnet system [ton]
6.4Weight of a TF structure [ton]
2.87Weight of a TF coil [ton]
3.0Overall width of a TF case [m]
4.2Overall height of a TF case [m]
640CICC length per coil [m]
Incoloy908Jacket material
NB3SnSuperconductor
~ 500Stored magnetic energy [MJ]
35.2Operating current [kA]
7.2Peak field in conductor [T]
3.5Toroidal field at major radius [T]
1.8Major radius [m]
16Number of coils
ValuesParameters
TF00 VPI Finished on April 2002
TF00 Coil Setup for TestTF00 coil set up in vacuum cryostat : August 2002Sandwich configuration with D shaped structuresOverall weight of the coil and structure : about 10 tonCurrent feeder : 50 kA current lead, NbTi CICC busline, Joints
TF00 Assembling Finished on August 2002
Coil & StructureCoil & StructureSC BuslineSC Busline JointsJoints Vacuum CryostatVacuum Cryostat
TF00 Coil Cool-down
TF00 Coil Cool-downCool-down in 9 daysRRR > 200 (requirement > 100)SC Phase transition @ 18 KNo helium leak @ 5 K, 6 bar
Thermal Contraction by Cool-down
Vertical ( -13.3 mm )
Horizontal(- 9.3 mm)Temperature History during Cool-down
TF00 Coil Current Excitation & DischargesSlow Discharge
Slow discharge at 29 kANo remarkable heating on coil &
structure
Fast DischargeFast discharge at 27 kAτ_dump ~ 2 secStructure heating by eddy current
Results of the TF00 Coil Test
17.31 0 2 4 6 8 10 120
20
40
60
80
100
Coi
l Cur
rent
(kA
)
B (T)
6 K
8 K10 K12 K
Strain = 0.7 %
TF00 Coil
KSTAR TF System
TF00 CoilBpeak ~ 4.2 T @ 35 kATcs ~ 12.2 K @ 0.7% strain
KSTAR TF MagnetBpeak ~ 7.2 T @ 35 kATcs ~ 9.2 K @ 0.7% strain
Well cool-down although void fraction of 32%
Uniform helium flow between channels although continuous winding scheme
No helium leaks
No SAGBO in spite of Incoloy908 jacket
Stable operation of the TF power supply and quench detection system
TF00 coil was assembled with TF magnet structure.
CS Model Coil Test
CS Model Coil (CSMC) TestTest Objectives
To verify the design and fabrication procedure of the KSTAR CS coilsTo measure the dc performance of the coil, such as Jc & joint lossTo measure the ac performance of the coil, such as ac loss
Vapor-cooled Current LeadVapor-cooled Current Lead
SC Busline(NbTi)
SC Busline(NbTi)
JointJoint
SC Coils(Nb3Sn)SC Coils(Nb3Sn)
Coil Structure(GFRP)
Coil Structure(GFRP)
SC BuslineSupporter
SC BuslineSupporter
System Layout of CS Model Coil Test
CSMC FabricationKSTAR CS & PF Coils
CSMC Winding Finished on Feb. 2002
PF5PF5
PF6PF6
PF7PF7
CS(PF1-4)
CS(PF1-4)
BuslineBusline
CS model coil = background coil systemBackground coil design : 8 T, & ±20 T/s
Comparison between CS Coil & CS Model Coil
240180Windings per coil
9.8 T @ 22.6 kA
135
0.40
0.74
0.37
0.56
2
CS Model Coil
B_peak [T]
Incoloy908Jacket
Nb3SnSuperconductor
93Inductance [mH]
0.49Height [m]
0.69Outer radius [m]
0.46Inner radius [m]
0.57Mean radius [m]
Number of coils
CS Coil (PF1 U&L)
Parameters
CSMC Setup for TestCS model coil set up in vacuum cryostat : July 2004Two coil in series Structure : GFRP plates to reduce eddy currentSensors : about 240 in total
CS Model Coil Assembling Finished on July 2004
SC CoilsSC Coils
Coil StructureCoil Structure
SC BuslineSC Busline
Busline SupporterBusline
Supporter Helium LinesHelium Lines
SensorsSensors
0 5 10 15 20 25-3 0
-2 0
-1 0
0
1 0
2 0
3 0
+ 1 .5 T /s
+ 3 T /s- 3 T /s
2 2 .4 kA
- 2 2 .4 kAOpe
ratin
g cu
rren
t [kA
]
t im e [se c ]
CSMC Operation AnalysisOperating Condition at 22.6 kA
Peak field on conductor : 9.75 TCentral field : 8.0 TTcs : ~ 8.3 K @ 0.3% strain
Current Waveform
Magnetic Field Distribution
0 5 1 0 1 5 2 0 2 50
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
Loss
[kJ]
T im e [sec ]
to ta lloss eddy hys te res is coup ling
AC Losses
Temp.Temp.FlowFlow FlowFlowTemp.Temp.
2004-10-04 2004-10-08 2004-10-12 2004-10-10
50
100
150
200
250
300
Tem
pera
ture
(K)
Time (Date)
Coil Inlet Coil Outlet Coil Inner Surface Coil Outer Surface
CSMC Cool-downCool-down in 9 days
• Vacuum pressure : 2 E-9 mbar • No helium leak• RRR ~ 200• Flow rate per coil ~ 23 g/s• Temperature : inlet 4.8 K, outlet 4.9 K• Side channel heating from structure
Sensors on Helium Line Temperature during Cool-down
CSMC Cool-down
Temp.Temp.
Temp.Temp. Strain_AAStrain_AA Strain_ADStrain_AD
0 50 100 150 200 250 300-1000
-500
0
500
1000
1500
Stra
in (p
pm)
Temperature (K)
Active-Dummy, Tangential Active-Dummy, Axial Active-Active
Strain Sensors during Cool-down • Temperature and field cancellation • Active-active type & Active-dummy type with GFRP bracket• Relative strain of coil insulation ~ 0.15 % tangential, ~ 0.07 % axial • Low thermal contraction of Incoloy908
Sensors on Coil Surface Strain on Coil Surface during Cool-down
CSMC Current Excitation & DischargeCurrent Excitation and Discharge
• Current Charge in step up to 15 kA• Slow discharge to 10 kA• Heating on helium inlet at 10 kA• Fast discharge, τ_dump ~ 3 sec
00:00 01:00 02:00 03:00 04:00
0
5
10
15
Cur
rent
(kA
)
Time (hh:mm)
Current
Current Ramping
Slow Discharge
Fast Discharge
Helium line Heating
CSMC Current Excitation & Discharge
00:00 01:00 02:00 03:00 04:00
0
1
2
3
4
5
6
Fiel
d In
tens
ity (T
)
Time (hh:mm)
B_Peak (BF703A) B_Center (BF001)
Magnetic Field
00:00 01:00 02:00 03:00 04:00-600
-400
-200
0
200
Stra
in (p
pm)
Time (hh:mm)
Active-Active (SA401A@MC1) Active-Dummy, Tangentail (SD404B@MC1) Active-Dummy, Axial (SD404C@MC1)
Strain Sensors
00:00 01:00 02:00 03:00 04:004
6
8
10
12
Tem
pera
ture
(K)
Time (hh:mm)
Inlet Total (TX110B@SHS) Outlet Total (TX110A@SHR) Inlet Ch3 (TX113A@SHS) Inlet Ch4 (TX114A@SHS) Outlet Ch4 (TX114A@SHR) Joint (TX121B@SHS)
Helium Temperature
00:00 01:00 02:00 03:00 04:000
10
20
30
Flow
Rat
e (g
/s)
Time (hh:mm)
Inlet Total (FM110A@SHS) Outlet Total (FM110A@SHR) Inlet Ch 2 (FM112A@SHS) Inlet Ch 3 (FM113A@SHS) Inlet Ch 4 (FM114A@SHS)
Helium Flow rate
Results of the CSMC Test
CS model coil was cooled down in 9 days.Current charging and discharge up to 15 kA with TF power supplyMeasured heat load per coil was about 30 W at zero current and about 100 W
at 15 kA.The test will be continued until the end of 2004.
Reference Coil Current for AC Loss Measurement
Other Test Activities
KSTAR Coil Acceptance Tests
Dimensional Measurement
4.2
m
PF7L
TF05
KSTAR Coil Acceptance Tests
High Voltage Test• DC Hipot : 15 kV• AC Hipot : 10 kVrms• Impulse
SCCoil
Flowrate Measurement
Hipot
Impulse
KSTAR Coil Acceptance Tests
7 8 9 10 11 12 13
600
900
1200
1500
1800
Jc (A
/mm
2 )
Applied Field (T)
TF03 TF02 TF05
TF Coil Strand Jc Measurement
SampleStrand Sample Jc Measurement • heat treatment with KSTAR coil• Jc measurement• Jc ≥ 750 A/mm2 @ 12T, 4.2 K
Jc Measuring System
Summary and Future Works
o The SC coil test facility has been constructed and operated well.
o Two kinds of SC coils has been tested in the test facility, a prototype TF coil and a pair of CS model coil.
o The results of coil tests showed that the coils has been fabricated without any remarkable defect such as coil leak, and SAGBO in Incoloy908 jacket.
o The flow in the cooling channels was uniform in spite of continuous winding scheme.
o The test of the CS model coil are going on including cool-down, current excitation and discharges and the test will be continued until the end of 2004 for AC loss measurement.
o Acceptance test of the KSTAR coils are being conducted including the dimensional measurement, flow uniformity check, high voltage insulation test, and Jc measurement of the heat treated strand.
Recommended