2K Cold Box PDR Introduction D. Arenius LCLS-II 2 K Cold Box PDR September 27, 2016

Valued comments and recommendations input for: Review Purpose Valued comments and recommendations input for: Technical Design Scope Design within cost and schedule ES&H Evaluation of readiness to continue the design toward a Final Design Review LCLSII 2K Cold Box PDR Sept 27 2016

Agenda Jefferson Lab CEBAF Center Room F133 Time Topic Presenter 10:00 Introduction: Purpose, Agenda, Scope, Charge, Lessons Learned and previous issues, Layout   Dana Arenius 10:30 Process Requirements and Design Approach Vishy Ravindranath 11:00 Mechanical Design (3D) Damon Rath 11:45 LUNCH 1:00 Safety and ESH Hongyu Bai 1:30 Structural Analysis Shirley Yang 2:00 Instrumentation and Control Chris Scanlon 2:30 Cost, Schedule and Staffing (High-level) Mike Bevins 2:45 BREAK 3:00 Questions LCLSII 2K Cold Box PDR Sept 27 2016

2K Cold Box Design Scope Engineer and design a cold box assembly in accordance with national and SLAC safety standards for fabrication Provide sub atmospheric pumping up to 215 g/s of 2K helium gas using five stages of serially connected variable speed centrifugal compressors supported by magnetic bearings Must support the flow rates associated with LCLSII “First Light” and standard normal linac operation LCLSII 2K Cold Box PDR Sept 27 2016

Members of the review Committee: Charge Members of the review Committee: Mr. Matthew Howe (SNS) Mr. Kelly Dixon (Jlab) Mr. Jay Theilacker (FNAL) LCLSII 2K Cold Box PDR Sept 27 2016

Review Charge Technical Scope Are all specifications, requirements, performance and interface documents identified, reviewed, and at the level of maturity commensurate with a PDR. Is the design sufficiently mature and technically sound so as to meet the performance specifications at this point of design? Have installation issues been identified and addressed in the preliminary design? Have all the major interfaces been identified and incorporated into the design? Design Management Is the design team organized and staffed to successfully complete the project? Have all of the major risks been identified (ex: seismic)? Has Value Engineering been appropriately applied? Is the development of associated process design sufficiently to support the detail mechanical and electrical design ? Cost and Schedule Is the current preliminary cost and schedule reasonable to achieve the planned technical scope? This is a reasonableness assessment by technical experts, not a detailed cost/schedule review. ES&H Have all related ES&H aspects been identified, and planned to be properly addressed? Miscellaneous Have all the previous design review action items/comments been addressed? Have lessons learned been addressed? Are there any other issues that have been identified that need to be addressed? Overall Readiness Is the design maturity at the level sufficient for preliminary design review approval? LCLSII 2K Cold Box PDR Sept 27 2016

Magnetic bearing coil failures…encapsulation Lessons Learned Magnetic bearing coil failures…encapsulation Applied voltage in helium <100V to avoid arc over Inter-stage piping volumes to avoid process coupling Role of run up torque on lower CC stages vs. amperage Flow distribution within CC suction piping Use of locked speed ratios during pump down instead of individual CC volumetric flow calculations Glass electrical feed through failures, large conductors LCLSII 2K Cold Box PDR Sept 27 2016

Cryoplant Building 2 CDS Transfer lines Cold Box Room Compressor Room 1 Compressor Room 2 Cold Box Room 2 CDS Transfer lines

Cryoplant Layout Overview LN2 storage CP1 4.5K Cold Box GHe storage CP1 Oil Removal CP2 4.5K Cold Box CP2 Oil Removal CP2 Compressors CP1 Compressors Oil processor 2K CBX Guard Vacuum CDS Interface Boxes LHe Dewar LHe Dewar Instrument Air Motor Control Center 9

May I answer any questions? LCLSII 2K Cold Box PDR Sept 27 2016