Particle accelerator
The Zero Gradient Synchrotron (ZGS), was a weak focusing 12.5 GeV proton accelerator that operated at the Argonne National Laboratory in Illinois from 1964 to 1979.
It enabled pioneering experiments in particle physics, in the areas of 
Other noteworthy features of the ZGS program were the large number of university-based users and the pioneering development of large superconducting magnets for bubble chambers and beam transport.
The hardware and building of the ZGS were ultimately inherited by a spallation neutron source program, the Intense Pulsed Neutron Source (IPNS).
In media.
Significant portions of the 1996 chase film "Chain Reaction" were shot in the Zero Gradient Synchrotron ring room and the former Continuous Wave Deuterium Demonstrator laboratory.