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The End Station Refrigerator 2 (ESR2) cryoplant will provide cryogens to three of the four experimental halls in support of 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) experimental demands. In particular, the near-future Measurement of a Lepton-Lepton Electroweak Reaction (MOLLER) experiment requires the additional capacity provided by ESR2. This new cryoplant consists of a 4.0 kW at 4.5-Kelvin cold box and a two-stage compressor system. The cold box and compressor equipment were received from the Superconducting Super Collider (SSC) project and are being refurbished to meet Jefferson Lab’s future operating needs. The ESR2 cryoplant includes a new, 50+ m long cold transfer line, bayonet-can, utility system, and control system. The paper describes the fabrication and installation challenges faced, mitigations adopted, and future work plans for the cryoplant.

The future operation of the 4 kW 15 Kelvin MOLLER experiment at Jefferson lab necessitates an increase of cryogenic capacity at the End Station Refrigerator. The current plant is the former 1.5 kW (4.5 K) ESCAR plant that has been operating at Jefferson Lab since 1995. The existing 1.5 kW plant is not able to support the load for MOLLER and will be replaced with a refurbished plant comprised of the cold box and compressors of the 4 kW ASST-A plant from the Superconducting Super Collider in Texas. This paper outlines the assembly, repair and modifications made to the cold box, along with the design of the plant as a whole and its integration into the existing distribution system.

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.

A new sub-atmospheric cold box (SC1R), which hosts five technologically superior, water-cooled compressors and one similar 4K-2K refrigeration recovery heat exchanger, was proposed in July 2017, to replace the existing 2K cold box. The design of the new 2K cold box and the external support system have been completed. The project is in the fabrication and assembly phase, which will be completed at JLab. We present the design features, fabrication, installation and commissioning schedule for the new 2K cold box.

The mechanical design and analysis of the LCLS II 2 K cold box are presented. Its feature and functionality are discussed. ASME B31.3 was used to design its internal piping, and compliance of the piping code was ensured through flexibility analysis. The 2 K cold box was analyzed using ANSYS 17.2; the requirements of the applicable codes-ASME Section VIII Division 2 and ASCE 7-10-were satisfied. Seismic load was explicitly considered in both analyses.

Construction and installation of the FRIB 4.5 K helium refrigeration system is nearing completion, with compressor system commissioning and 4.5 K refrigerator commissioning on schedule to occur in late 2017. The LINAC 4.5 K helium distribution system, all major process equipment, and the cryogenic distribution for the sub-systems have been procured and delivered. The sub-atmospheric cold box fabrication is planned to begin the summer of 2017, which is on schedule for commissioning in the spring of 2018. Commissioning of the support systems, such as the helium gas storage, helium purifier, and oil processor is planned to be complete by the summer of 2017. This paper presents details of the equipment procured, installation status and commissioning plans.

The MSU-FRIB cryogenic distribution system supports the 2 K primary, 4 K primary, and 35 - 55 K shield operation of more than 70 loads in the accelerator and the experimental areas. It is based on JLab and SNS experience with bayonet-type disconnects between the loads and the distribution system for phased commissioning and maintenance. The linac transfer line, which features three separate transfer line segments for additional independence during phased commissioning at 4 K and 2 K, connects the folded arrangement of 49 cryomodules and 4 superconducting dipole magnets and a fourth transfer line supports the separator area cryo loads. The pressure reliefs for the transfer line process lines, located in the refrigeration room outside the tunnel accelerator area, are piped to be vented outdoors. The transfer line designs integrate supply and return flow paths into a combined vacuum space. The main linac distribution segments are produced in a small number of standard configurations; a prototype of one such configuration has been fabricated at Jefferson Lab and has been installed at MSU to support testing of a prototype FRIB cryomodule.

The Electron Ion Collider (EIC) at Brookhaven National Laboratory consists of one existing hadron ring and new electron accelerator. The EIC incorporates beamline and detector elements that require superconductivity, which is achieved by cooling these elements to cryogenic temperatures. The EIC cryogenic systems are designed to provide cooling for various components, including heat shield circuits, current leads, power couplers, thermal intercepts, and superconducting devices operating at or below 4.5 K. The existing central plant used for cooling Relativistic Heavy Ion Collider (RHIC)’s magnet rings will also be used for EIC. There are Superconducting magnets that require operation at 1.92 K, and Superconducting Radio Frequency (SRF) cavities that require operation at 2.0 K. These are located at distinct locations around the Collider ring. Satellite systems located locally will be installed to produce the 1.92 K and the 2.0 K cooling capability. These systems will not be fully independent standalone plants, rather they will use the existing central plant for capacity assistance. The existing cryogenic distribution in the hadron magnet ring will also be used to supply the satellite systems. This paper examines the different types of loads imposed on the existing central plant and evaluates where the plant is expected to operate. Due to modifications made to the plant for the RHIC program, the existing equipment is evaluated to assess whether changes are needed to the cold end of the plant: expander(s), exchangers and return piping configuration to return the satellite return streams. The finding provides valuable insights into upgrade/modification requirements, optimizing the cryogenic plant, and ensuring reliable support for EIC’s advanced scientific objectives.

The Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL) will involve superfluid helium cooling of superconducting magnets and Superconducting Radio Frequency (SRF) cavities at several sites around the existing Relativistic Heavy Ion Collider (RHIC) accelerator tunnel. While the majority of the cooling power for these loads is provided by BNL’s central cryogenic plant, Jefferson Lab is designing satellite equipment which augments the central plant and enables 2 Kelvin operation. The 2 K cryogenic distribution system for the collider’s 10 o’clock location (Interaction Region 10 or IR10) includes all necessary interfaces to the IR10 Satellite Refrigerator, to the overall EIC cryogenic distribution system, and to 12 SRF cryomodules for the electron and hadron storage rings. In addition to providing the required cooling capacities in all operating modes, the IR10 2 K cryogenic distribution system also stabilizes the supply temperature and enables safe connection and disconnection of individual IR10 cryomodules. Moreover, the layout of the IR10 2 K cryogenic distribution system copes with challenging spatial constraints and adapts to the process configuration and routing of existing RHIC cryogenic distribution components which will be re-used for EIC. This paper gives a full overview of the IR10 satellite cryogenic distribution system design, and highlights some of the challenges encountered.

In support of the Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL), Jefferson Lab is contributing to the design of three satellite cryogenic plants. These satellite plants will augment BNL’s central plant, which currently provides cryogenics for the Relativistic Heavy Ion Collider (RHIC) at temperatures down to 4.5 Kelvin. The primary role of the satellite plants is to further cool the cryogenic loads to 2 Kelvin, a critical requirement for EIC operations. Secondary objectives of the satellite plant process design include utilization of the existing RHIC cryogenic distribution infrastructure, assurance that the central plant’s present capacity is not exceeded, and optimization of overall cost efficiency. This paper presents a comprehensive evaluation of various process configurations for each satellite plant. It discusses the advantages and disadvantages of each configuration, their integration with the central plant, and the rationale behind the final selection for the satellite plant process design.