400 MHz LHC Crab Cryomodule with Helium Vessels, Tuners and Couplers

Superconducting radio frequency (SRF) cavities are being successfully used for acceleration of charged particle beams worldwide. In addition, the application of SRF cavities for the manipulation of beam properties in the transverse plane finds more and more applications. The use of superconducting structures allows very high deflecting fields in a compact structure, highly desirable feature for applications involving manipulations of the charged particle beams at the point of delivery, such as Final Focus (FF) point. Using superconducting deflecting structures in future SRF accelerators allows for further increases of the interactions of existing colliding beams, and hence the overall machine performance. The Large Hadron Collider (LHC) has been gradually upgrading its performance since its commissioning in 2009. LHC will be at the energy frontier in high energy physics for many years to come. Even before initial commissioning, plans have been under discussion for an upgrade, in particular toward an increase of its luminosity. One avenue that has been under discussion is the introduction of a bunch deflecting scheme (also called a crabbing scheme) to restore the luminosity lost due the finite crossing angle. The Large Hadron Collider has identified SRF deflecting cavities as a way to increase luminosity for the upcoming High-Luminosity (HiLumi) Upgrade. The technical objective of this Phase IIA continuation project is to fabricate the helium vessel, HOM dampers and tuners for the SRF deflecting cavities to be used in the HiLumi Upgrade. To meet the HiLumi Upgrade schedule, these fully dressed cavities must be at CERN by the end of calendar year 2015, integrated into a cryomodule in 2016, and ready for installation at SPS in early 2017. Compact equipment utilizing SRF cavities can be successfully used in a broad range of applications from increasing beam luminosity in colliders, to manipulation of the correlation between the longitudinal and transverse phase space projections of the beam particle distribution.