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Product

IEC 61788-27 20 K MgB2 DC link cableIEC 61788-27 MgB₂ (Tc = 39 K)18–25 K Gaseous Helium Cooled3 kA to 120 kA DC Transfer Link

MgB2 Superconducting Link Cable18–25 K forced-flow helium Magnesium Diboride (MgB₂) 3–120 kA DC superconducting link

High-current DC superconducting transfer line cable (MgB2 Superconducting Link Cable) built to IEC 61788-27 and CERN HiLumi LHC specifications using ex-situ Powder-in-Tube (PIT) multifilamentary Magnesium Diboride (MgB₂, Tc = 39 K) round wires in a.

Low-EMC design
EMC screen
Water-resistant
Approved
Order designation
MgB2-Monopole-18kA-20K
Bundle Ø
19.2 mm
Rated DC I
18.0 kA
Operating T
20.0 K
Min. bend R
400 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Superconductor
MgB₂ (Tc = 39 K)
Ø 0.85–1.0 mm 37-filament PIT
Operating temp.
18 K to 25 K
forced-flow gaseous helium (GHe)
Link current
3 to 120 kA DC
single sub-cable or 19-circuit
Stabilizer
OFHC Cu braid
RRR > 100 quench shunt core
Insulation
Polyimide wrap
1.5 kV to 20 kV DC rated
Min. bend R
1.2 to 1.8 m
flexible corrugated cryostat

Typical values for this cable type, based on IEC 61788-27 / CERN HiLumi LHC WP6a / Cryogenic DC Link Std — confirmed in the datasheet and quotation for your order.

Application fit

Is MgB2 Superconducting Link Cable right for your machine?

Enables remote placement of room-temperature power converters 100 to 500 metres away from radiation or underground magnet galleries by transporting up to 120 kA of DC current through a single flexible Ø 160–220 mm gaseous-helium cryostat operating at 18–25 K.

Fixed installation

Suitable

Pulled in continuous 100–500 m pre-reacted lengths through vertical shafts and service tunnels between surface converters and.

Immersion & wet locations

Suitable

Cooled by low-density forced-flow gaseous helium (GHe at 18–25 K, 2–4 bar) or liquid hydrogen (LH₂ at 20 K).

TBM gantry & advancing tunnel reel

Suitable

Replaces puluhan tonnes of rigid water-cooled copper busbars in accelerator tunnels, fusion tokamak buildings and.

Typical machinesParticle Accelerator Cold-Powering Links (HiLumi LHC)Fusion Reactor Remote Power Supply Bus LinesLH₂ Cooled Cryogenic Aircraft & Shipboard DC LinksGreen Aluminium Smelter & Electrolyser High-Current DC Buses

Construction

Layer by layer

Shown: MgB2-Link-120kA-HiLumi multi-circuit DC transfer bundle containing 18 kA, 10 kA, 3 kA and 0.6 kA concentric/twisted MgB₂ sub-cables (Ø 1.0 mm 37-filament MgB₂ in Monel/Ni matrix with tin-coated OFHC copper core and copper stabilization braid), polyimide insulation and flexible double-walled vacuum cryostat.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Helical layer of ex-situ PIT MgB₂ round strands6 to 24 round multifilamentary MgB₂ wires (Ø 0.85–1.0 mm, 37 MgB₂ filaments in Ni/NbDelivers ≥ 500–600 A per 1 mm wire at 20 K, 0.5–1.0 T with isotropic round-wire geometry
2Central OFHC copper stabilizer coreStranded tin-plated Oxygen-Free High-Conductivity (OFHC, RRR > 100) copper ropeProvides thermal heat capacity and parallel current bypass during a magnet quench
3Outer OFHC copper wire braid & polyimide dielectricBraided tinned copper thermal/electrical shunt + overlapped polyimide film & PEEK/glassElectrically isolates individual circuits inside a compact multi-pole bundle
4Flexible corrugated AISI 316L vacuum-insulated cryostatConcentric inner GHe flow pipe + multi-layer superinsulation (MLI) under 10⁻⁶ mbar vacuumLimits static heat load to < 1.5 W/m over 100–500 m transfer runs

MgB₂ Unit Sub-Cables (3 kA to 18 kA Monopole / Coaxial)

Pre-reacted round MgB₂ + OFHC copper unit cables supplied on Ø 2.5 m spools for custom cryostats

Multi-Circuit 60–120 kA DC Link Assembly

Complete multi-pole bundle pulling up to 19 independent DC circuits inside one flexible GHe cryostat

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61788-27 / CERN HiLumi LHC WP6a / Cryogenic DC Link Std. Values for your order are confirmed in the datasheet and quotation.

Electrical

Single-strand critical current (I_c @
≥ 500 to 650 A per Ø 1.0 mm multifilamentary MgB₂ strand
Total transfer line DC current capacity
3 kA to 18 kA (single circuit) · up to 120 kA total (multi-circuit bundle)
Dielectric withstand in 20 K gaseous
3.0 to 5.0 kV DC (accelerator link) · up to 20–50 kV DC (HVDC link)

Thermal

Superconducting transition & operating
T_c = 39 K · Operating window 18 K to 25 K (max. current-sharing T_cs ≥ 26
Coolant medium
Forced-flow Gaseous Helium (GHe, 2–5 g/s at 0.2–0.4 MPa) or Liquid

Mechanical

Irreversible axial tensile strain limit
ε_irr ≥ 0.35 % to 0.45 % (pre-reacted Monel-sheathed MgB₂ wire)
Minimum bending radius (pre-reacted)
120–400 mm (sub-cable) · 1.2 to 1.8 m (complete multi-circuit cryostat)

Resistance

Quench hotspot protection
Calculated adiabatic hotspot < 200 K during energy extraction decay
Environmental & chemical durability
Resistant to moisture, industrial fluids and service ageing

Reference standards

Governing superconductor standards
IEC 61788-27 (Twist pitch & critical current of MgB₂ wires) & CERN WP6a
Factory QA & material compliance
EN 10204 3.1 routine test certificate · RoHS 2 & REACH compliant

Identification

Circuit polarity & telemetry
Integrated Pt1000 / Cernox temperature sensors & voltage taps along the
Customs tariff (HS)
8544.49

Sizes

6 standard 20 K MgB₂ superconducting DC sub-cable & link configurations

Pre-reacted MgB₂ unit sub-cables (3–18 kA) and complete multi-circuit cryogenic transfer links (60–120 kA).

Architecture, outer diameter & 20 K DC current rating
Order designationMgB₂ strand layoutForm factorBundle Ø
mm		Rated DC I
kA		T_op
K		Min. bend R
mm		Enquiry
Pre-Reacted 20 K MgB₂ Unit Sub-Cables (3 kA to 18 kA DC)
MgB2-Sub-3kA-20K6×Ø1.0 mm MgB₂ around Cu coreØ 4.1 mm Sub-cable4.13.220.0120
MgB2-Coax-10kA-20K2×12 MgB₂ concentric (±10 kA)Ø 16.5 mm Coaxial16.510.020.0350
MgB2-Monopole-18kA-20K18×Ø1.0 mm MgB₂ + Cu braidØ 19.2 mm Cable19.218.020.0400
Complete Multi-Circuit & Bi-Pole 20 K MgB₂ Superconducting Transfer Links
MgB2-Link-60kA-Cryo2×18kA + 4×3kA + 12×0.6kA bundleØ 65 mm Cable / Ø 160 Cryo65.060.020.01,200
MgB2-Link-120kA-HiLumi19-circuit multi-pole DC bundleØ 90 mm Cable / Ø 220 Cryo90.0120.020.01,800
MgB2-HVDC-20kV-50kA2×25 kA ±20 kV DC bi-poleØ 78 mm Cable / Ø 190 Cryo78.050.020.01,500
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • All MgB₂ strands are reacted prior to cabling and insulated so the finished link requires no site heat treatment.

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
IEC 61788-27 strand I_c @ 20 K & 2-bar gaseous helium HV Paschen testMeets 20 K critical current with zero partial discharge in 1 bar / 2 bar GHeEvery strand & cable lot
Sample tests
Full-scale bending & thermal-cycling endurance test (300 K ↔ 20 K)≥ 97 % I_c retention after spooling and shaft routing simulationQualification length

Inspection certificate

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

Product approvals

IEC 61788-27 MgB₂ Superconductor Compliant20 K Gaseous Helium Dielectric & Quench VerifiedISO 21013 Cryogenic Vessel & Vacuum Certified

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

Cryostat & Reel Tag: TEBAOFLEX MgB2-LINK <model> Iop=<kA>@20K 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

PDFMgB2 Superconducting Link Cable – technical datasheet6 sizes · construction, technical data, approvalsXLSXMgB2 Superconducting Link Cable spec data (Excel)All 6 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 is Magnesium Diboride (MgB₂) ideal for 20 K DC superconducting transfer lines?
With a critical temperature of Tc = 39 K, MgB₂ operates comfortably at 18–25 K cooled by low-cost forced-flow gaseous helium (or 20 K liquid hydrogen) where low-temperature NbTi (Tc = 9.2 K) and Nb₃Sn (Tc = 18.3 K) are already normal-conducting, while costing a fraction of rare-earth REBCO 2G HTS tapes in low-field (< 1.5 T) DC transfer lines.
Why must electrical insulation on a 20 K helium-gas-cooled cable be specially designed?
By Paschen's law, low-pressure room-temperature or warm helium gas has a dielectric breakdown strength only ~15 % that of air. Multi-layer overlapped polyimide films with staggered butt-gaps and braided PEEK/glass spacers lengthen the helium creepage path to guarantee multi-kilovolt withstand.
How are MgB₂ link cables spliced to LTS (NbTi / Nb₃Sn) magnet leads or HTS current leads?
At the 20 K–4.5 K interface box, the Monel sheath is etched back from the MgB₂ filaments and soldered inside low-resistance (< 1 nΩ) copper-stabilized lap joints cooled by helium flow.
What factory routine tests and certificates are supplied with MgB2 Superconducting Link Cable?
Every production drum of MgB2 Superconducting Link Cable undergoes 100 % conductor DC resistance measurement at 20 °C, high-voltage AC/DC dielectric withstand testing, and dimensional verification per IEC 61788-27 / CERN HiLumi LHC WP6a / Cryogenic DC Link Std, supplied with an EN 10204 3.1 inspection certificate.

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