Thinkers

Thinkers (thinkers.co.kr) is the web presence of 제이에이취엔지니어링 (JHENG), a Korean engineering company that develops superconducting magnet systems and related cryogenic, materials and high-voltage technologies. Its product catalog is organized into superconducting magnets, materials, devices, parts and services. The magnet line includes MCZ superconducting magnets for silicon ingot growing (dry-type SHF 1.2, SHF 1.6, SHF 1.8 and CUSP 1.75 variants, plus a liquid-helium type SHF 1.6), ECRIS plasma superconducting magnets, accelerator magnets and plasma permanent magnets.

Beyond magnets, the company supplies materials such as ingots, silicon cathodes, silicon rings and high-purity indium wire; devices including a fault current limiter, a superconducting magnet fault detection unit, magnetic field measurement equipment and the JH218 cryogenic temperature control unit; and parts such as JENOX products, PT100 sensors, cryogenic sensor cables, current leads and multi-layer insulation (MLI). Services listed include conduction-cooling experiments and temperature sensor calibration. The site also operates an online shop and publishes technical content, for example an article on the role of the high-voltage signal conditioner (HVSC) in quench detection.

A representative product, the MCz Dry type SHF 1.2, is a helium-free (conduction-cooled) magnet with a 1,460 mm outer diameter, 1,194 mm inner diameter, 1,000+200 mm height and 5.5 ton weight, generating a horizontal central field of roughly 1.5–2.5 kG at operating currents of 100–150 A using NbTi wire (∅0.83 mm) in a proprietary patented circular saddle-shaped winding, with two cryocoolers, HTS-plus-brass current leads, passive quench protection and a 50 K thermal shield. It is delivered as a plug-and-play system with power supply, control software, helium compressors and magnetic shielding, quoted with a one-year warranty and roughly two to three months from order to shipment.

Business model

The company sells engineered hardware — superconducting magnet systems, cryogenic devices, materials and components — on a build-to-order basis, complemented by technical services such as conduction-cooling testing and temperature sensor calibration, and by an online store for smaller items.

Latest developments

In July 2025 the company published a technical article on the role of the high-voltage signal conditioner (HVSC) in quench detection and reported participating in Quantum Korea 2025. It has also posted a notice for its 13th annual general meeting of shareholders.