瑞典巨型中子源将如何改写材料科学的未来
Deep beneath the farmlands of southern Sweden, a quiet revolution in materials science is taking shape. The European Spallation Source (ESS), currently nearing completion in Lund, is designed to generate the most intense neutron beams ever produced, dwarfing existing facilities by an order of magnitude. When fully operational later this decade, it will function as a kind of super-resolution microscope for matter, allowing researchers to peer inside jet engine alloys, viral proteins, and quantum materials with a precision that borders on the atomistic. The project’s sheer scale — a 600-metre-long proton accelerator, a rotating tungsten target wheel, and a suite of 15 cutting-edge instruments — represents a decisive bet that neutrons, rather than more familiar X-rays or electrons, hold the key to solving some of the 21st century’s most intractable industrial and scientific challenges.
At its core, the ESS employs a process called spallation: protons are accelerated to nearly the speed of light and smashed into a heavy-metal target, knocking out a cascade of neutrons with each impact. Unlike nuclear reactors, which produce a steady stream, spallation sources release bursts of neutrons at tightly controlled intervals, enabling time-resolved experiments that capture dynamic processes — from ion diffusion in batteries to the fleeting folding of a protein — over microsecond timescales. The facility’s initial 2.0-megawatt beam power, eventually upgradeable to 5.0 MW, will yield a neutron flux so brilliant that it promises to reduce experiment times from days to hours, thereby opening the door to statistically rich datasets that have long been out of reach. Such raw power, however, demands extraordinary engineering feats, including cryogenic moderators operating at 20 Kelvin to slow the neutrons just enough to make them interrogate soft matter gently.
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