400 MHz LHC Crab Cryomodule with HOM Dampers, Tuners and Couplers
Superconducting radio frequency (SRF) cavities are being successfully used for acceleration of charged particle beams worldwide. The application of the SRF cavities for manipulation of the beam properties in the transverse direction finds more and more applications. The use of superconducting structures helps maximize the electric field gradient, a highly desirable feature for applications involving manipulations of the charged particle beams at the point of delivery, such as Final Focus point of large synchrotron rings. Application of the parallel bar superconducting structure in future SRF accelerators will allow a further increase over existing machine performance. This proposal will develop a fully functional horizontal cryomodule for a 400 MHz superconducting parallel-bar crabbing cavity prototype for tilting a proton beam at the Large Hadron Collider (LHC). The crabbing cavity uses a significant transverse asymmetry of the electric field distribution of the fundamental mode, which requires a respective asymmetry of the power coupler. Three competing designs for the crab cavity are currently being evaluated at CERN. The downselect is planned for April 2013. Niowave has fabricated all three initial prototypes of the cavity designs, and is ready to implement a cryomodule for the selected design. This proposal will finalize the design and develop the transversely asymmetric power coupler & amp; pickup, the HOM dampers, both slow and fast frequency tuners, and the microphonic mechanical dampers. All other systems needed for a functional cryomodule (eg: helium transfer lines, magnetic shielding, etc) will also be a part of this project. The final cryomodule design should satisfy the strict requirements and the limitations of the existing tunnel environment of the LHC synchrotron near the Final Focus point, and should be capable of the test requirements in the SPS tunnel. To accomplish these tasks, Niowave has partnered with Old Dominion University and Fermilabthe two integral participants of the US involvement at the Large Hadron Collider.
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