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Product

IEC 61788 / ITER 4.5 K CICC conductorIEC 61788 · 4.5 K Supercritical HeNb3Sn (13.5 T) & NbTi (6.4 T)10–80 kA · AISI 316LN Conduit

CICC Superconducting ConductorNb3Sn & NbTi 4.5 K forced-flow supercritical helium Cable-in-Conduit Conductor (CICC)

High-field Cable-in-Conduit Superconducting Magnet Conductor (CICC) built to IEC 61788 and fusion magnet standards with Cr-plated Nb3Sn or Ni-plated NbTi/Cu strands cabled in 5 stages around a central helium cooling spiral and compacted inside a.

Water-resistant
Low-EMC design
EMC screen
Approved
Order designation
CICC-Nb3Sn-TF-68kA
Outer dim.
43.7 mm
Operating I_op
68.0 kA
Peak B-field
11.8 T
Jacket profile
43.7 mm Ø Round
All sizes (7)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Superconductor
Nb₃Sn or NbTi
Ø 0.73–0.82 mm Cr/Ni-plated
Operating cur.
10 to 80 kA DC
45–68 kA standard tokamak coil
Peak B-field
6.4 to 13.5 T
NbTi ≤ 6.5 T · Nb₃Sn ≤ 13.5 T
Cryogen flow
4.5 K SHe @ 6bar
supercritical helium forced flow
Void fraction
29 % to 34 %
annular bundle helium porosity
Conduit alloy
AISI 316LN
low-carbon N-strengthened SS

Typical values for this cable type, based on IEC 61788-1 / IEC 61788-2 / ITER Magnet Design Criteria — confirmed in the datasheet and quotation for your order.

Application fit

Is CICC Superconducting Conductor right for your machine?

Engineered for Toroidal Field (TF), Central Solenoid (CS), Poloidal Field (PF) and Correction Coils in magnetic-confinement fusion tokamaks, stellarators, high-field NMR/MRI solenoids and particle-accelerator detector magnets.

Fixed installation

Suitable

Wound into pancake or layer magnet coils and vacuum-pressure impregnated (VPI) with glass-polyimide/epoxy insulation.

Immersion & wet locations

Suitable

Internal central spiral and 30–33 % bundle void fraction carry forced-flow supercritical helium at 4.2–4.5 K and 0.5–0.6 MPa.

Furnace, kiln & high-temp zone

Suitable

Nb3Sn CICC coils withstand +650 °C vacuum heat-treatment reaction cycles (~200 hours) inside low-Co AISI 316LN conduits.

Typical machinesTokamak & Stellarator Fusion Reactors (TF/CS/PF)High-Energy Physics Detector & Dipole MagnetsHigh-Field Hybrid Research Solenoids (15–45 T)Superconducting Magnetic Energy Storage (SMES)

Construction

Layer by layer

Shown: CICC-Nb3Sn-TF-68kA with Ø 8×10 mm 316L central cooling spiral, 6 sub-cable petals (900 Cr-plated Nb3Sn strands + 522 OFHC copper stabilizer strands, 316L foil wrapped) compacted inside a seamless AISI 316LN structural conduit.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
15-stage transposed Nb₃Sn or NbTi + OFHC Cu rope6 trapezoidal petal sub-cables (e.g. ((2sc+1Cu)×3×5×5 + core)×6) with 1–2 µm Cr or NiMulti-stage cabling fully transposes strands while Cr/Ni plating suppresses inter-strand coupling loss during
2Central supercritical helium cooling spiralOpen-gap helically wound AISI 316L stainless-steel strip (ID 7–8 mm / OD 9–10 mm, 30–40 %Provides a low-pressure-drop hydraulic channel while allowing radial helium exchange into the strand bundle
3Sub-cable & bundle AISI 316L stainless wraps0.05 mm AISI 316L tape around each petal (50 % open) and 0.10 mm overlapping wrap aroundControls inter-petal contact resistance and protects strands during pull-through jacketing
4Seamless compacted AISI 316LN (or Ti/Incoloy 908)Butt-welded and roll-compacted circular or square heavy-wall tube (UNS S31653, Co ≤ 0.05Contains 2.5 MPa quench pressure and reacts massive B × I Lorentz electromagnetic forces across the winding

Nb₃Sn CICC (Wind-and-React · up to 13.5 T)

Cr-plated bronze-route or internal-tin Nb₃Sn strands reacted at +650 °C for TF & CS coils

NbTi CICC (Ductile Pre-Reacted · up to 6.4 T)

Ni-plated Nb-47wt%Ti multifilamentary strands for PF coils, correction coils and 68 kA busbars

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61788-1 / IEC 61788-2 / ITER Magnet Design Criteria. Values for your order are confirmed in the datasheet and quotation.

Electrical

Operating current (I_op @ 4.5 K)
10 kA to 80 kA DC / pulsed (standard 45 kA CS & 68 kA TF)
Current-sharing temperature (T_cs)
≥ 5.7 K (TF at 68 kA, 11.8 T) · ≥ 5.2 K (CS at 45 kA, 13.0 T)
Copper stabilizer RRR (R₂₇₃K / R₂₀K)
≥ 100 (after +650 °C Nb₃Sn reaction heat treatment) · ≥ 150 (NbTi)
Non-Cu critical current density (J_c)
≥ 850–1,100 A/mm² (Nb₃Sn @ 12 T, 4.2 K) · ≥ 2,700 A/mm² (NbTi @ 5 T)

Thermal

Cryogenic coolant & inlet conditions
Supercritical Helium (SHe) at 4.2–4.5 K, 0.5–0.6 MPa, 3–10 g/s mass flow
Nb₃Sn reaction heat-treatment cycle
+210 °C / +340 °C / +450 °C plateaus + +650 °C (200 h) under high-purity

Mechanical

Bundle void fraction
29 % to 34 % in strand annulus (plus open central spiral)
Conduit cryogenic yield & Charpy
σ₀.₂ ≥ 1,000 MPa & K_IC ≥ 150 MPa·√m at 4.2 K (AISI 316LN)

Resistance

Maximum quench pressure rating
≥ 25 MPa (250 bar) hydraulic proof test; 100 % helium leak ≤ 10⁻¹⁰ Pa·m³/s
Nuclear activation control
Cobalt content Co ≤ 0.05 wt% and Niobium/Tantalum controlled in 316LN

Reference standards

Governing superconductor standards
IEC 61788-1 (NbTi), IEC 61788-2 (Nb₃Sn), IEC 61788-11 (RRR) & ITER Criteria
Weld & NDT qualification
100 % radiographic, ultrasonic & phased-array inspection of jacket butt

Identification

Unit length delivery
100 m to 1,000 m continuous jacketing line lengths wound on Ø 4.0 m reels
Customs tariff (HS)
8544.49 / 8505.90

Sizes

7 standard Nb₃Sn & NbTi CICC superconducting magnet conductors

Round-in-round and circle-in-square heavy-wall 316LN CICC designs from 10 kA to 80 kA.

Conductor architecture, current & peak field
Order designationStrand architectureJacket profileOuter dim.
mm		I_op @ 4.5K
kA		Peak B
T		CryogenEnquiry
Nb₃Sn High-Field Wind-and-React CICC Conductors (11.8 T to 13.5 T @ 4.5 K)
CICC-Nb3Sn-TF-68kA900 Nb3Sn + 522 Cu strands43.7 mm Ø Round43.768.011.84.5 K SHe
CICC-Nb3Sn-CS-45kA576 Nb3Sn + 288 Cu strands49.0×49.0 mm Sq.49.045.013.04.5 K SHe
CICC-Nb3Sn-HF-80kA1080 Nb3Sn + 540 Cu strands52.0×52.0 mm Sq.52.080.013.54.5 K SHe
NbTi Ductile Pulsed & Busbar CICC Conductors (4.0 T to 6.4 T @ 4.5 K)
CICC-NbTi-PF1-48kA1440 NbTi/Cu strands53.8×53.8 mm Sq.53.848.06.44.5 K SHe
CICC-NbTi-PF2-55kA1152 NbTi/Cu strands51.9×51.9 mm Sq.51.955.05.04.5 K SHe
CICC-NbTi-CC-10kA240 NbTi/Cu strands19.2×19.2 mm Sq.19.210.04.04.5 K SHe
CICC-NbTi-Bus-68kA1440 NbTi + Cu sub-cables48.0 mm Ø Round48.068.04.54.5 K SHe
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Custom petal counts, Cu:non-Cu ratios and square/rectangular jacket profiles are engineered per magnet winding pack.

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
100 % Helium mass-spectrometer leak, ultrasonic weld & pressure testZero leak (≤ 10⁻¹⁰ Pa·m³/s) at 25 MPa Nitrogen/Helium pressureEvery jacketed length
Sample tests
4.2 K critical current (I_c), RRR, hysteresis & coupling loss testMeets IEC 61788-1/-2 J_c, RRR ≥ 100 and n·τ coupling time constantEvery strand & sub-cable lot

Inspection certificate

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

Product approvals

IEC 61788-1 / -2 / -11 Superconductor QualifiedSULTAN 11 T / 4.5 K Full-Size Sample ValidatedEN 10204 3.1 / 3.2 Cryogenic Metallurgy Cert.

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

Laser-etched on 316LN conduit: TEBAOFLEX CICC <type> LOT# + FIDUCIAL METRE MARKS
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

PDFCICC Superconducting Conductor – technical datasheet7 sizes · construction, technical data, approvalsXLSXCICC Superconducting Conductor 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 does a CICC use a 6-petal rope around a central spiral inside a compacted steel tube?
In a large 45–68 kA fusion magnet, pool-boiling liquid helium cannot penetrate a dense winding pack fast enough to prevent thermal quench, and Lorentz forces (I × B ≈ 800 kN/m) would crush unreinforced copper/superconductor strands. The CICC architecture bathes every 0.8 mm strand in forced-flow supercritical helium (30 % void fraction) fed from the low-impedance central spiral, while the heavy-wall AISI 316LN conduit carries the structural Lorentz load.
Why are Nb₃Sn strands plated with 1–2 µm of Chromium and NbTi strands plated with Nickel?
During pulsed magnet operation (dB/dt), inter-strand eddy-current loops would generate excessive AC heating if bare copper surfaces sintered together during compaction or the +650 °C Nb₃Sn reaction bake. A 1–2 µm Cr (or Ni) barrier prevents diffusion bonding and maintains optimal inter-strand contact resistance.
Why must the void fraction of a Nb₃Sn CICC be held tightly around 29–33 %?
Nb₃Sn is a strain-sensitive A15 intermetallic compound. If the void fraction is too high (> 36 %), electromagnetic Lorentz loads bend and buckle individual strands under cyclic pulsing, permanently degrading critical current (I_c). If the void fraction is too low (< 27 %), strands are over-pinched during compaction and hydraulic pressure drop rises sharply.
What factory routine tests and certificates are supplied with CICC Superconducting Conductor?
Every production drum of CICC Superconducting Conductor undergoes 100 % conductor DC resistance measurement at 20 °C, high-voltage AC/DC dielectric withstand testing, and dimensional verification per IEC 61788-1 / IEC 61788-2 / ITER Magnet Design Criteria, supplied with an EN 10204 3.1 inspection certificate.

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