THE HELIOS-1 COMPACT SUPERCONDUCTING STORAGE-RING X-RAY SOURCE

The basic properties of synchrotron radiation are described, the desig n of storage rings to produce synchrotron radiation is outlined, and t he criteria for matching storage ring design to the needs of X-ray lit hography are discussed. Simple scaling laws are presented showing the benefits for a storage ring of using the higher fields which supercond ucting magnets are able to provide. Helios 1 is a compact superconduct ing storage ring built by Oxford instruments for installation at the I BM Advanced Lithography Facility (ALF). Design choices for superconduc ting rings are discussed, and the design and construction of Helios ar e described. Test results from the initial commissioning of Helios at Oxford are presented, but the main data on its performance when instal led at ALF are given in another paper in this issue.