In its fifty-year history, the German national research laboratory DESY (Deutsches Elektronen-Synchrotron, German Electron Synchrotron) has undergone a gradual transformation from a single-mission particle physics laboratory to a multi-mission research center for accelerator physics, particle physics, and photon science. The last is an umbrella term for research using synchrotron radiation and, in later years, free-electron laser. Synchrotron radiation emerged initially as a peripheral part of the laboratory activities but grew to become a central experimental activity at DESY via a series of changes in the organizational, scientific, and infrastructural setup of the lab, and in its contextual scientific, political, and societal environment. Together with an earlier publication on the issue in this journal,1 this article chronicles the first thirty years in the history of synchrotron radiation at DESY. The focus is on the gradual transformation of DESY’s research program in synchrotron radiation from peripheral and parasitic into mainstream and mission. We provide insights about the crucial renewal of Big Science laboratories toward the end of the twentieth century. This renewal culminated in the close-down of several particle physics machines in the early 2000s and their replacement by facilities dedicated to the study of the structure, properties, and dynamics of matter by the interaction with vacuum ultraviolet and X-ray photons. Therefore, we contribute to better understanding the growth of synchrotron radiation as a laboratory resource, and processes of renewal in Big Science as part of the general history of late-twentieth-century science.

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