THE UPGRADE OF THE DUV-FEL FACILITY AT THE BNL

The DUV-FEL linac is upgraded from 200 to 300 MeV to enable the HGHG FEL to produce 100 µJ pulses of 100 nm light. This will establish the DUV FEL as a premier user facility for ultraviolet radiation, and will enable state- of-the-art gas phase photochemistry research. Further more, the upgraded facility will also enable several critical R&Ds for future X-ray FELs, such as cascaded and higher harmonic HGHG (n>5), and experimental demonstration of the emittance spoiler for the LCLS . The upgraded HGHG will operate at the 4 th harmonic with the seed laser at 400nm. The increase of the electron beam energy will be accomplished by installing a 5 th linac cavity and two 45 MW klystrons. New HGHG modulator and dispersion sections vacuum chambers will be manufactured to accommodate new matching optics and 8 th harmonic HGHG. The status of the DUV-FEL upgrade and other beam physics R&D opportunities are presented..