Abstract
SSRL plans an ambitious program of beam line upgrades including replacing some existing wigglers with in vacuum undulators as well as developing up to five new in vacuum undulator beam lines resulting in as many as 10 undulator beam lines in a fully built out SPEAR3. SSRL also plans accelerator upgrades in the near future to further reduce the effective beam emittance to ≈ 6 nm and minimize vertical motion of the tunnel floor. By upgrading the injector rf system to a frequency commensurate with SPEAR3 and operating the electron gun in photo-cathode mode, top-off injection can be implemented in a multi-bunch pulse train mode. Short pulse operation for ultrafast pump/probe science is accomplished with a few-ps low-alpha configuration in either a few discrete buckets or in a hybrid mode with discrete buckets and hundreds of other buckets filled to higher charge and longer pulse length. All of these improvements are part of a coordinated plan to provide the User community with reliable operations and increased experimental capability.
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