Abstract
Commissioning of the LCLS II cryogenic plant has been planned with respect to electrical and mechanical systems checkout, equipment cleanup, cool-down, and individual performance evaluation. This plant consists of warm and cold storage, helium compressors, 4.5 K and 2 K cold boxes, and all auxiliaries typical for helium refrigeration processes. The 2 K cold box, consisting of five cold compressors in series to produce the flow and pressures necessary for 2K operation, will be the last equipment installed and, along with an additional 10,000 L helium dewar, will allow the entire plant to be commissioned as a single entity. The pre-commissioning stages, commissioning plan for 2 K cold box without connecting to the LCLS II LINAC, additional test equipment needed to simulate the loads, all process studies and associated results are described herein.
Highlights
Two cryogenic plants with 2.0 K Cold Boxes are required for the Linac Coherent Light Source II (LCLSII) project, which is under installation phase at SLAC National Accelerator Laboratory, Menlo Park
Overall system design and engineering [2] have been completed for the cryogenic plant, which is similar to the existing cryogenic system [3] at Thomas Jefferson National Accelerator Facility
The process model has been developed to verify the operation of the cold compressors against the operational limits of each one and to develop the pump down paths
Summary
Two cryogenic plants with 2.0 K Cold Boxes are required for the Linac Coherent Light Source II (LCLSII) project, which is under installation phase at SLAC National Accelerator Laboratory, Menlo Park. Objectives and Purpose The main objective of the present work is to develop a complete commissioning plan for the 2.0 K cold box including all required commissioning equipment. Develop a process simulation model for 2.0 K cold box commissioning and acceptance testing (iv). A commissioning test scenario has been developed with isolating the LCLS II superconducting linac at the Interface Box by removing the necessary u-tubes. Lines A and B of main transferline are connected to the 2.0 K test dewar in order to simulate the part of LCLS II superconducting linac pump down volume. Electrical heater (ETHR41521-24) is used to raise the inlet temperature of CC1 to 3.5 K in order to simulate the actual operating condition
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