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SNF Issue No. 48, April 2020
Record-setting Fields with All-superconducting Magnets
January 24, 2020 (HP140). High field superconducting magnets are of vital importance for researchers in condensed matter physics. By far the highest magnetic field ever achieved with superconducting magnets is known as 32 T, obtained at NHMFL with a 17.1 T REBCO insert in a 15T low-temperature superconducting (LTS) background magnet.
Using high-temperature superconducting (HTS) insert magnet technology, Prof. WANG Qiuliang’s group from the Institute of Electrical Engineering (IEECAS) has successively achieved all-superconducting magnets with a central field up to 25.7 T  and 27.2 T . Based on the research foundation, they tried to build a 30T all-superconducting magnet for the Synergetic Extreme Condition User Facility (SECUF), which is designed to be China’s premier user facility providing expertise, instrumentation, and infrastructure for investigating matter science under extreme physical conditions.
The current 30 T all-superconducting magnet project is based on a 15T/Φ160mm LTS magnet. For the 15T LTS magnet two non-insulated (NI) coils were developed, named HTS1 and HTS2. The HTS1, composed of 24 Double-Pancakes (DP)s, has inner and outer diameters of 43 mm and 108 mm, respectively, and a height of 198 mm.
The achieved 32.35 T central field by the all-superconducting magnet is currently the highest magnetic field ever achieved by all-superconducting magnets. With a clear bore of Φ35mm, the all-superconducting magnet can be directly used as an NMR user magnet.
A Tribute to Archie Campbell
January 11, 2020 (PA46). Archie was a Cambridge ‘lifer’. As we’ve heard, he came up to Cambridge in October 1959 and stayed. After graduating in Natural Sciences in 1962, Archie joined Jan Evetts and Anant Narlikar in David Dew-Hughes’ group in Materials Science and Metallurgy. Archie and Jan were to become life-long friends and colleagues and to make a joint contribution to the field of superconductivity that was to be internationally acclaimed and never surpassed. Both Archie and Jan were towering intellects in their own right, so together they were, quite simply, unstoppable.
On completion of their PhDs, Archie and Jan were on temporary contracts in Materials Science and Metallurgy until Jan was awarded a Lectureship in the Department. Archie was a Royal Society Fellow for a while, during which period the classic Campbell and Evetts monograph on Critical Currents in Superconductors was written. This extraordinary work, which was even translated into Russian, is considered to be the bible of applied superconductivity and has guided literally thousands of researchers, both young and old, in the subject now for almost 50 years.
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