Abstract
SM18 is CERN main facility for testing superconducting accelerator magnets and superconducting RF cavities. Its cryogenic infrastructure will have to be significantly upgraded in the coming years, starting in 2019, to meet the testing requirements for the LHC High Luminosity project and for the R&D program for superconducting magnets and RF equipment until 2023 and beyond. This article presents the assessment of the cryogenic needs based on the foreseen test program and on past testing experience. The current configuration of the cryogenic infrastructure is presented and several possible upgrade scenarios are discussed. The chosen upgrade configuration is then described and the characteristics of the main newly required cryogenic equipment, in particular a new 35 g/s helium liquefier, are presented. The upgrade implementation strategy and plan to meet the required schedule are then described.
Highlights
Superconducting magnets and superconducting Radio-Frequency cavities are essential components of CERN current and future particle accelerators
For the development of the required technologies and for testing the operational devices at cryogenic temperatures, CERN operates a number of facilities, ranging from individual component tests to the final validation of the full scale magnets and cavities before installation
It is planned to perform a type test of a full scale string of the final focusing triplet of magnets for the High Luminosity LHC (HL-LHC) (HL-LHC string). All these tests are planned to be performed in SM18; the ramping up of the testing requirements has already started and will accelerate from 2019 with the planned test and installation of new 11 T dipole magnets in 2020 [7]
Summary
Superconducting magnets and superconducting Radio-Frequency cavities are essential components of CERN current and future particle accelerators. The installation of a full scale string of the final focusing inner triplet magnets of the HL-LHC project is planned for 2021 This will require a dedicated cryogenic distribution system and specific modifications of the operation that are not completely defined as the test program for the HL-LHC string is currently being finalized. A baseline design overcapacity of 50 % (58 g/s) on the requirement for liquid helium is considered necessary to be able to carry out the full test program with no constraints from the LHe production (e.g. unplanned tests, repeated tests and components with low performance), guarantee the testing of the superconducting links and operation of the HL-LHC string while not limiting the tests of magnets and cavities testing and ensuring an acceptable flexibility for the long term testing program. Test program Validation of spare devices R&D magnets & cavities for HL-LHC R&D and series tests for SC links HL-LHC string of magnets Other R&D and measurement
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