Abstract

LCLS-II is major up-grade to the SLAC Facility. It adds a 4 GeV superconducting accelerator, which will generate an extremely bright and continuous (million pulses/sec) X-ray laser beam. The LCLS-II superconducting accelerator comprises 37 cryomodules connected through a complex distribution system to two large Helium Refrigerators. A single Helium cryogenic plant is expected to deliver 4.0 kW of cooling capacity at 2.0 K. Each cryogenic plant has a set of five operating compressors with an additional spare compressor that provides the required mechanical power (∼ 4.5 MW / cryogenic plant). In this paper, we describe the recent commissioning and performance test results of the LCLS-II compressor system.

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