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Product

IEC 61788-26 REBCO 2G HTS CORC cableIEC 61788-26 REBCO 2G HTS4.2 K to 77 K · Up to 20+ TRound Isotropic · R_bend ≥ 25 mm

CORC Cable Conductor on Round Core (CORC) High-TemperatureIsotropic round REBCO 2G HTS superconducting cable (4.2 K–77 K · up to 20+ T)

High-current, flexible Conductor-on-Round-Core (CORC) high-temperature superconducting cable built to IEC 61788-26 by helically winding multiple layers of 2–4 mm wide REBCO 2G HTS coated-conductor tapes with thin-film Hastelloy C-276 substrates around a.

Low-EMC design
EMC screen
Water-resistant
Approved
Order designation
CORC-C-5.5-30T
Cable Ø
5.5 mm
I_c (4.2K, 20T)
10.5 kA
I_c (77K, 0T)
3.2 kA
Min. bend R
50 mm
All sizes (7)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Superconductor
2G HTS REBCO
(Gd,Y)Ba₂Cu₃O₇₋δ coated tapes
Temp. range
4.2 K to 77 K
LHe (4.2K), GHe (20K), LN₂ (77K)
Peak B-field
Up to 20–25 T
beyond the 14 T limit of Nb₃Sn
Critical cur.
3.2 to 80 kA
at 4.2 K, 20 T (0.8–27.5 kA @77K)
Cable diameter
Ø 2.8 to 7.8 mm
single CORC (Ø 26 mm 6-around-1)
Min. bend R
25 to 75 mm
≥ 95 % I_c retention on bending

Typical values for this cable type, based on IEC 61788-26 / DOE High-Field Magnet Program — confirmed in the datasheet and quotation for your order.

Application fit

Is CORC Cable right for your machine?

Solves the fundamental mechanical limitation of flat REBCO 2G HTS tapes (which cannot bend edgewise) by winding 18 to 48 tapes helically around a flexible round copper core, creating an isotropic round conductor that bends in any plane and operates in fields up to 25 T or in 50–77 K helium/nitrogen.

Fixed installation

Suitable

Wound into tight-radius (< 35 mm) canted-cosine-theta (CCT) dipole magnets, compact tokamak coils and high-field insert solenoids.

Immersion & wet locations

Suitable

Operates in liquid helium (4.2 K), supercritical helium (20 K) or subcooled liquid nitrogen (65–77 K) dewar/cryostat loops.

Offshore platform & shipboard deck trays

Suitable

Used for high-power-density shipboard degaussing, electric aircraft propulsion buses and naval pulse-power links at 50–77 K.

Typical machinesCompact High-Field Fusion Tokamaks (20 T)20 T Particle Accelerator Dipole & Quadrupole MagnetsCryogenic Electric Aircraft & Naval Power BusesHigh-Field NMR / MRI Insert Coils (> 1 GHz)

Construction

Layer by layer

Shown: CORC-W-3.5-30T (Ø 3.5 mm) with Ø 2.3 mm stranded OFHC copper former, 10 alternating helical layers (30 tapes) of 2 mm wide REBCO 2G HTS coated conductor (30 µm Hastelloy C-276 substrate + 5 µm Cu surround) and vacuum-rated polyimide/PFA electrical insulation.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Alternating helical layers of REBCO 2G HTS tapes18 to 48 tapes (2, 3 or 4 mm width, 30 µm Hastelloy C-276 substrate, 1.5 µm REBCO layerConverts axial cable bending strain into pure reversible axial/biaxial tension-compression so tapes slide
2Flexible round OFHC copper formerSolid or fine-stranded oxygen-free high-conductivity (OFHC, RRR > 150) copper core (Ø 1.8Acts as mechanical winding mandrel and parallel quench-protection current shunt
3Cryogenic polyimide or braided S-glass dielectricMulti-layer lapped polyimide film (2×25 µm) or braided S-glass / polyester sleeve (orProvides 2–10 kV turn-to-turn dielectric strength at 4.2–77 K without mechanical constraint during bending

CORC-W Wire (Ø 2.8–4.2 mm · 2–3 mm Tapes)

Ultra-flexible magnet wire using 30 µm substrate 2–3 mm REBCO tapes for R_bend down to 25 mm

CORC-C Cable (Ø 5.5–7.8 mm · 4 mm Tapes)

High-current 30–48 tape conductor for 10–18 kA at 4.2 K (or 2–6 kA in 77 K LN₂)

6-around-1 CORC-CICC (50–100 kA Fusion)

Six CORC cables cabled around a central cooling tube inside an extruded Cu/stainless jacket

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61788-26 / DOE High-Field Magnet Program. Values for your order are confirmed in the datasheet and quotation.

Electrical

Engineering current density (J_e @ 4.2
300 to 650 A/mm² across full round cable cross-section
Critical current (I_c @ 4.2 K, 20 T)
3,200 A (Ø 2.8 mm) to 18,000 A (Ø 7.8 mm) · up to 80 kA (6×1 CICC)
Critical current (I_c @ 77 K
800 A (Ø 2.8 mm) to 6,000 A (Ø 7.8 mm) in liquid nitrogen
Inter-tape contact resistance
Low-resistance Ag/Cu interface allows current sharing around localized

Thermal

Operating temperature window
1.9 K / 4.2 K (LHe) · 10–50 K (GHe / cryocooler) · 65–77 K (LN₂)
Reaction heat treatment required?
None — REBCO 2G HTS tapes are fully reacted prior to cabling (Wind-only)

Mechanical

Minimum isotropic bend radius
25 mm (CORC-W Ø 2.8 mm) to 75 mm (CORC-C Ø 7.8 mm) with > 95 % I_c
Irreversible axial tensile strain limit
ε_irr ≥ 0.5 % to 0.7 % (Hastelloy C-276 substrate)

Resistance

Transverse Lorentz stress tolerance
≥ 150–200 MPa (with epoxy/solder impregnation in high-field coils)
Radiation & cryogenic cycling resistance
Withstands > 100 thermal cycles (300 K ↔ 4.2 K) without I_c degradation

Reference standards

Governing HTS standards
IEC 61788-26 (Critical current of REBCO coated conductors) & IEC 61788-3
Quality verification
100 % continuous Hall-probe/Tapestar I_c mapping of every REBCO tape

Identification

Termination technology
Low-resistance (< 5 nΩ) tapered-layer indium/SnPb soldered OFHC copper
Customs tariff (HS)
8544.49 / 8505.90

Sizes

7 standard REBCO 2G HTS CORC wire & cable configurations

Single CORC-W wires, CORC-C power/magnet cables and 6-around-1 fusion CICC assemblies.

Dimensions, tape count & critical current (4.2 K & 77 K)
Order designationREBCO tape layupFormer / ConduitCable Ø
mm		I_c (4.2K, 20T)
kA		I_c (77K, 0T)
kA		Min. bend R
mm		Enquiry
CORC-W Small-Diameter Magnet Wires (2–3 mm REBCO Tapes · Tight Bend R)
CORC-W-2.8-18T18 REBCO tapes (6 layers · 2 mm)Ø 1.8 mm Cu core2.83.20.825
CORC-W-3.5-30T30 REBCO tapes (10 layers · 2 mm)Ø 2.3 mm Cu core3.55.41.430
CORC-W-4.2-36T36 REBCO tapes (12 layers · 3 mm)Ø 2.6 mm Cu core4.27.82.138
CORC-C High-Current Magnet & Cryogenic Bus Cables (4 mm REBCO Tapes)
CORC-C-5.5-30T30 REBCO tapes (10 layers · 4 mm)Ø 3.8 mm Cu core5.510.53.250
CORC-C-6.8-42T42 REBCO tapes (14 layers · 4 mm)Ø 4.5 mm Cu core6.814.24.665
CORC-C-7.8-48T48 REBCO tapes (16 layers · 4 mm)Ø 5.2 mm Cu core7.818.06.075
6-around-1 CORC-in-Conduit (CICC) Fusion Magnet Conductors
CORC-6x1-CICC-80kA6×CORC-C-6.8 in Cu/SS conduitØ 26.0 mm CICC26.080.027.5250
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Critical current at 4.2 K is stated in a 20 Tesla background magnetic field; 77 K value is in self-field liquid nitrogen.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
77 K liquid-nitrogen critical current (I_c) & n-value V–I curve test1 µV/cm criterion per IEC 61788-26 across full cable lengthEvery manufactured length
Sample tests
4.2 K high-field (12–20 T) critical current & minimum bend-radius test≥ 95 % I_c retention at rated minimum bend radiusQualification lot

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 61788-26 REBCO 2G HTS Certified100 % Tape-by-Tape Hall-Probe I_c MappedRoHS 2 & Conflict-Free Rare-Earth Traceable

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

Spool & Termination Tag: TEBAOFLEX CORC <model> Ic(77K)=<kA> LOT#
Delivery form
Non-returnable fumigated wooden or steel drums
Standard lengths
250 m · 500 m · 1000 m standard drums
MOQ
250 m (stock sizes) · 500 m (custom)
Lead time
3–5 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFCORC Cable Conductor on Round Core (CORC) High-Temperature – technical datasheet7 sizes · construction, technical data, approvalsXLSXCORC Cable spec data (Excel)All 7 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why can a CORC cable bend to a 25–50 mm radius in any direction when a flat REBCO tape cannot bend in-plane?
In a CORC cable, narrow (2–4 mm) REBCO tapes with thin (30 µm) Hastelloy C-276 substrates are wound helically at ~45° around a round core without bonding between layers. When the cable is bent in any direction, the tapes slide slightly and experience pure axial tension/compression below the 0.5 % irreversible strain limit of REBCO.
Why is REBCO CORC used above 14–16 Tesla instead of Nb₃Sn CICC?
The upper critical magnetic field (B_c2) of Nb₃Sn drops rapidly to zero around 24–27 T at 4.2 K, limiting practical Nb₃Sn magnets to ~13–16 T. REBCO has an irreversible field exceeding 100 T at 4.2 K, allowing CORC cables to maintain 300–650 A/mm² engineering current density at 20–25 T.
How are low-resistance joints made to all 30–48 layers of a CORC cable?
At the cable ends, each helical REBCO layer is trimmed in a stepped staircase taper so every tape layer makes direct electrical contact with a precision-machined OFHC copper terminal sleeve vacuum-soldered with low-melting InBi or SnPb solder, achieving joint resistance below 2–5 nΩ.
What factory routine tests and certificates are supplied with CORC Cable?
Every production drum of CORC Cable undergoes 100 % conductor DC resistance measurement at 20 °C, high-voltage AC/DC dielectric withstand testing, and dimensional verification per IEC 61788-26 / DOE High-Field Magnet Program, supplied with an EN 10204 3.1 inspection certificate.

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CORC Cable Conductor on Round Core (CORC) High-Temperature

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