Triaxial cable extensions & connectors

custom triaxial cable extension

In severe operating conditions, and when the use of detectors with an integral cable is not preferred, an alternative is to use a triaxial mineral insulated cable extension connected to the detector.

High level of resistance or radiations and electromagnetic parasitic signals
Watertight, mineral insulated cables and connectors
Customization according to the user’s needs
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Technical information

Similar to coaxial cable extensions & connector but in triaxial configuration

Basic type MI Cable External diameter (mm) Signal transmission Connector type
EXT-HN 6 Pulse, fluctuation (Campbell) and current modes HN


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Such mineral insulated cable extensions are terminated by two adapted HN or specific triax-connectors (plugs or jacks). Triaxial cable extensions & connectors can work for pulse and current transmissions.

Custom coaxial cable extensions & connectors

By full control of the following processes, Photonis Nuclear Instrumentation can supply custom triaxial cable extensions & connectors with the highest quality and reliability levels

  • Adaptation to customer specific requirements.
  • Development of new triaxial cable extensions & connectors with our experienced R&D team.
  • Long term collaboration with the French Atomic Energy Commission / CEA (theoretical approach, modeling, qualification tests in research reactors.
  • Complete manufacturing process on site.
  • Support from all the Photonis Group activities, experience and knowledge.
  • Certifications & Quality Assurance programs adapted to the customer environment.
  • Technical support, applying expertise.
  • Export control, as an Authorized Economic Operator, Photonis acts in accordance with the EU international regulations.
Main features
  • Structure configuration: triaxial (one central conductor, one internal envelope, one external envelope).
  • Cable materials: Multi metallic cable envelopes for high immunity to parasites. Mineral insulator.
  • Connector Material: Stainless steel and Nickel structure and high-grade Alumina (Al2O3) insulators.

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Examples of custom versions from basic types
  • Adapted mechanical interface with the equipment (Customized external dimensions, cable curvature radius)
  • Adapted electrical characteristics (characteristic impedance, capacitance, line resistance, attenuation, transfer impedance
  • Cable insulator material (Al2O3, MgO, SiO2)
  • LOCA (Lose Of Coolant Accident) and post-LOCA protection
  • Ruggedized structure for harsh environment (radiation, temperature, humidity, mechanical stress)
  • Adapted HN or specific triax-connectors. Coaxial Mineral insulated connector type (HN, BNC, BNCHT or specific) can also be integrated to triaxial cables. Reinforced types are available for high pressure, high temperature conditions
  • External mechanical and/or electrical protection around the cable and/or the connectors (folded spiral seam, radiation resistant heat-shrink sleeve)
  • Connectors can also be delivered in mating connector or tight feedthrough versions

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The French Atomic Energy Commission (CEA) selected Photonis as its technological partner for a co-operative development of neutron and gamma detectors when the French nuclear power program took shape in the sixties.

Our references

PWR – Safety critical signal transmission in reactor building – Mineral insulated cable extension – EXT-HN - France

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Triaxial Cable Extensions & Connectors




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