Abstract
RF Crab Cavities are an essential part of the HL-LHC upgrade. Two concepts of such systems are being developed: the Double Quarter Wave (DQW) and the RF Dipole (RFD). A cryomodule with two DQW cavities is in advanced fabrication stage for the tests with protons in the SPS. The cavities must be operated at 2 K, without excessive heat loads, in a low magnetic environment and in compliance with CERN safety guidelines on pressure and vacuum systems. A large set of components, such as a thermal shield, a two layers magnetic shield, RF lines, helium tank and tuner are required for the successful and safe operation of the cavities. The sum of all these components with the cavities and their couplers forms the cryomodule. An overview of the design and fabrication strategy of this cryomodule is presented. The main components are described along with the present status of cavity fabrication and processing and cryomodule assembly. The lesson learned from the prototypes and first manufactured systems are also included.
Highlights
A cryomodule is by definition an apparatus for maintaining a very low temperature
Novel RF cavities aimed at reducing the crossing angle at the interaction points are foreseen based on 2 different designs, one for vertical (Double Quarter Wave, DQW) and one for horizontal interaction (RF Dipole, RFD)
Each of them is enclosed by a set of systems including helium tank, High Order Modes suppressors (HOMS), pickup field antenna, Fundamental Power Coupler (FPC) and cold magnetic shield
Summary
A cryomodule is by definition an apparatus for maintaining a very low temperature. This condition is a requirement for all superconducting systems in an accelerator. Large sections of the LHC will be modified for its High Luminosity major upgrade [1] In this frame, novel RF cavities aimed at reducing the crossing angle at the interaction points are foreseen based on 2 different designs, one for vertical (Double Quarter Wave, DQW) and one for horizontal interaction (RF Dipole, RFD). Keeping a system at cryogenic temperature is a demanding task in terms of energy, the heat transmitted from the outer environment must be minimized by careful design. This requirement must find a compromise with the need of structural strength, to comply with the mechanical loads and alignment stability
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