Conceptual design of the cryostat for the new high luminosity (HL-LHC) triplet magnets

The High Luminosity LHC (HL-LHC) is a project aiming to upgrade the LHC collider to maintain scientific progress and exploit its full capacity. In the HL-LHC configuration, the Inner Triplet (IT) magnets of the present LHC will be replaced by a new set of higher performance magnets. The collective behaviour of the new magnets and the related systems will be studied and validated in a dedicated cryogenic test facility, the IT String, currently under construction. This paper presents the results of the functional analysis performed to design the cryogenic system for the IT String. The required operation modes are identified and detailed together with the operational parameters and constraints used to define the cryogenic system. The layout of the cryogenic distribution system that fulfils the requirements of the IT String is presented and the characteristics of the main components are described.

Section: Magnets and Cold Powering Systemmentioning

confidence: 99%

Functional analysis and design of the cryogenic system for the HL-LHC IT String test bench at CERN

Rolando

Sisti

Lucas

et al. 2022

“…This also applies to the HL-LHC supports, however given the compact integration into the cryostat, the design must also include features to allow its assembly with limited accessibility. The first design concept for the support post aimed to solve the assembly difficulties with a two-part column separated by a heat intercept plate [3]. This concept also provided precise temperature control but had structural and manufacturing disadvantages.…”

Section: Cold Mass Supportsmentioning

confidence: 99%

“…A new cryostat design is required, imposed by additional constraints resulting from a very compact integration environment, significantly higher dynamic heat loads and the need for accurate magnet positioning throughout the operational lifetime. Hereafter we review the layout, the main design choices introduced since the conceptual design [3] and further detail the solutions implemented in the final design of the cryostats for the HL-LHC magnets.…”

Section: Introductionmentioning

confidence: 99%

Final design of the cryostat for the high luminosity LHC magnets

Ramos

Craen

Prin

et al. 2022

The high luminosity LHC project (HL-LHC) aims at increasing proton collisions by a factor of ten whilst extending physics exploitation until 2035. Its performance will rely on new focusing quadrupoles, beam separation dipoles and corrector magnets with large apertures to be installed on both sides of the ATLAS and CMS experiments. A dedicated cryostat design of about 1 m in diameter was developed for operation of these magnets at 1.9 K, comprising the required cryogenic circuits, interconnects, supports, insulation, and instrumentation systems. Six cryostats with various lengths in the range of 8 to 11 m are required on each side of the interaction points to house the triplet magnets, correctors and the first separation dipole. These cryostats will be linked through flexible interconnects to form a continuous vacuum insulation and cryogenic system of about 60 m in length. The second rearmost separation dipole requires a stand-alone cryostat of 15 m in length but nevertheless features common design principles. We present the design of these cryostats, from a conceptual stage towards the final design. Assembly aspects are also addressed, including a modular approach affording flexibility and simplification of the manufacturing and assembly processes.

“…A SC link, about 100 meters long routed through a transverse tunnel about 50 meters long connects the DFH cryostat to the DFX cryostat in the main LHC tunnel. The DFX cryostat, situated 80 meters away from the interaction point, ensures the electrical continuity with the triplet continuous cryostat [2], see figure 1.…”

Section: Overall Designmentioning

confidence: 99%

“…The superconducting link comprises an actively cooled thermal shield with an inlet gas temperature of 20 K. Heat loads due to conduction will be studied and minimized during the detailed design phase. [2]. The cryogenic layout of the cold powering system presents a continuous helium volume from injection into the DFX up to the DFH where the fluids are returned to the cryogenics lines.…”

Section: Conceptual Design Approachmentioning

confidence: 99%

Conceptual study of the cryostats for the cold powering system for the triplets of the High Luminosity LHC

Ballarino

Giannelli

Jacquemod

et al. 2017

View the article online for updates and enhancements. Abstract. The High Luminosity LHC (HL-LHC) is a project aiming to upgrade the Large Hadron Collider (LHC) after 2020-2025 in order to increase the integrated luminosity by about one order of magnitude and extend the operational capabilities until 2035. The upgrade of the focusing triplet insertions for the Atlas and CMS experiments foresees using superconducting magnets operating in a pressurised superfluid helium bath at 1.9 K. The increased radiation levels from the particle debris produced by particle collisions in the experiments require that the power converters are placed in radiation shielded zones located in a service gallery adjacent to the main tunnel. The powering of the magnets from the gallery is achieved by means of MgB2 superconducting cables in a 100-m long flexible cryostat transfer line, actively cooled by 4.5 K to 20 K gaseous helium generated close to the magnets. At the highest temperature end, the helium flow cools the High Temperature Superconducting (HTS) current leads before being recovered at room temperature. At the magnet connection side, a dedicated connection box allows connection to the magnets and a controlled boil-off production of helium for the cooling needs of the powering system. This paper presents the overall concept of the cryostat system from the magnet connection boxes, through the flexible cryostat transfer line, to the connection box of the current leads. IntroductionThe principal part of the High Luminosity Large Hadron Collider (HL-LHC) project [1] requires the installation of new triplet insertions focusing the beams at each side of the Atlas and CMS interaction points. Due to increasing intensity and luminosity, the higher levels of radiation require shielding of the power converters by installing them in a newly dug parallel gallery. The powering of the triplet insertion magnets is performed via a flexible superconducting line (hereafter called "SC link") about 100 meters long, connected to the magnets on one end and to the power converters on the other end through dedicated connection cryostats referred respectively in the LHC naming convention as DFX and DFH, see figure 1. The High Luminosity HL-LHC project [1] will include four of these SC links with DFH-DFX connection cryostats and will be installed in the LHC tunnel in 2024-2025. In this paper the main functions of the flexible line and the two connection cryostats are presented, the main challenge being to design a cooling scheme ensuring the superconducting state of the conductors with high reliability. Technical requirements requiring further detailed studies are listed and identified.The conceptual designs of the electrical, vacuum, cryogenic and mechanical layouts are described taking into account the specificities of maintainability and operation in an activated area. A specific