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on september 22, the water-cooled magnet independently developed by the high magnetic field science center of the hefei institutes of physical science, chinese academy of sciences, producedthe steady-state magnetic field of 420,200 gauss (42.02 teslas) broke the world record of 414,000 gauss set in 2017 by a water-cooled magnet at the national high magnetic field laboratory in the united states.it has become a new milestone in the development of international high-magnetic field water-cooled magnet technology. this is also another major technological breakthrough achieved by the steady-state high-magnetic field experimental device after the hybrid magnet successfully created the world steady-state magnetic field record of 452,200 gauss in 2022.

steady-state strong magnetic field is an extreme experimental condition required for material science research and is a "weapon" to promote major scientific discoveries. over the past few decades, scientists around the world have achieved many major scientific research results in scientific research under steady-state strong magnetic field conditions, and more than a dozen scientific research results have won the nobel prize. there are currently five major steady-state strong magnetic field laboratories in the world, located in the united states, france, the netherlands, japan and hefei science island, china. steady-state strong magnetic field magnets are divided into three types, namely water-cooled magnets, superconducting magnets, and hybrid magnets composed of water-cooled magnets and superconducting magnets. water-cooled magnets are the earliest type of magnets used by scientists. they have the advantages of flexible and fast magnetic field control, and can generate magnetic field strengths that are far higher than superconducting magnets. they provide reliable and efficient experimental conditions for material science research.

with the support of the joint scientific research project of the chinese academy of sciences and anhui province, after nearly four years of unremitting efforts, the strong magnetic field technology research team has innovated the magnet structure and optimized the manufacturing process, and finally generated a steady-state magnetic field of 420,200 gauss at a power supply of 32.3 megawatts, marking a new peak in the development of strong magnetic field water-cooled magnet technology in my country and even in the world. the successful development of this magnet not only better meets the actual needs of scientific research users for fast-controlled steady-state strong magnetic fields, but also provides powerful experimental conditions for scientists to explore new phenomena and reveal new laws, and lays a key technical foundation for my country to build a higher field strength steady-state magnet.

researcher kuang guangli, academic director of the high magnetic field science center, vividly compared the development of steady-state high magnetic field technology to the competition on the table tennis court. "water-cooled magnets and superconducting magnets are both 'singles masters', and hybrid magnets are 'mixed doubles combinations'. in 2022, we won the mixed doubles championship with our comprehensive advantages. today, we have made new breakthroughs in this field and won a 'singles championship'."

the steady-state strong magnetic field experimental device, a major national scientific and technological infrastructure, began to be "built and operated" in 2010 and was fully completed and put into full operation in 2017. by the end of 2023, the device had operated for more than 600,000 machine hours, providing experimental conditions for 197 units at home and abroad. device users have carried out cutting-edge research on more than 3,000 projects in the fields of physics, chemistry, materials science, life science, pharmacology, engineering technology, etc., and have achieved a series of major scientific and technological achievements.

(cctv reporter shuai junquan and wang li)