diagnostic systems and NIST undulator (soft X-ray source). A 1 GeV electron storage ring dedicated for UV-WV Construction of the storage ring and linac-injector started FEL operation is under construction at the Duke University in 1992. Magnetic measurements (excitation curves and 2-D Free Electron Laser Laboratory. The UV-VUV FEL project, maps) of all magnets in their real environment was performed based on the collaboration of the Duke FEL Laboratory and before installation using an eleven

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... using an eleven element Hall probe array Budker Institute for Nuclear Physics is described. [21. The overall accuracy of these measurements was better The main parameters of the DFELL storage ring, of the then 0.01%. OK-4 optical klystron, and the experimental set-up are At present, all storage ring magnets and 80% of the presented. The parameters of UV-VUV FEL are given and the vacuum chambers and other hardware have been installed, A possible future upgrades to this system are discussed. vacuum of (0.6-6)E-10 torr was achieved in the ring. The 178