Overview of superconducting RF technology and its application to hiqh-current linacs

Delayen, J. R.; Bohn, C.L.

doi:10.1063/1.49071

Cited by 3 publications

(5 citation statements)

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“…The design has evolved from the parallel-bar design with rectangular outer conductor and cylindrical loading elements operating in a TEM-like mode [15] into a cylindrical design with trapezoidal-shaped loading elements [20]. The cavity was designed to maximize the net deflection with low peak surface fields and minimize the power dissipation on the surface with high shunt impedance [21]. The trapezoidal-shaped loading elements were optimized to reduce both peak surface electric and magnetic fields and maximize the transverse electric field [20].…”

Section: Introductionmentioning

confidence: 99%

“…The functional specifications and dimensional constraints in recent applications, such as the crabbing cavity requirements in the LHC high luminosity upgrade [13], require compact superconducting deflecting and crabbing cavities. Some of those designs are the SLAC half-wave spoke resonator crabbing cavity [14], the parallelbar cavity [15], the Lancaster University-Cockroft Institute 4-rod cavity [16], the KEK Kota Cavity [17], and the BNL quarter-wave cavity [18]. The new compact rf structures operate in TEM-like or TE-like modes [17,19] where the rf-dipole cavity is one of them.…”

Section: Introductionmentioning

confidence: 99%

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Cryogenic test of a proof-of-principle superconducting rf-dipole deflecting and crabbing cavity

Silva

Delayen

2013

Phys. Rev. ST Accel. Beams

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Recent applications in need of compact low-frequency deflecting and crabbing cavities have initiated the design and development of new superconducting structures operating at high gradients with low losses. Previously, TM 110 -type deflecting and crabbing cavities were developed and have also been operated successfully. However, these geometries are not favorable designs for low operating frequencies. The superconducting rf-dipole cavity is the first compact deflecting and crabbing geometry that has demonstrated high gradients and high shunt impedance. Since the fundamental operating mode is the lowest mode and is widely separated from the nearest higher order mode, the rf-dipole design is an attractive geometry for effective damping of the higher order modes in high current applications. A 400 MHz rf-dipole cavity was designed, fabricated, and tested as a proof-of-principle cavity. The cavity achieved high operating gradients, and the multipacting levels were easily processed and did not reoccur.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cryogenic test of a proof-of-principle superconducting rf-dipole deflecting and crabbing cavity

Silva

Delayen

2013

Phys. Rev. ST Accel. Beams

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“…Evolution of the parallel-bar cavity geometry into the rf-dipole geometry A series of parallel-bar cavity geometries with different outer conductors and parallel loading elements (Fig. 8 with optimal properties [28,29]. The design properties for each design are analyzed using the 3D eigenmode simulator CST MICROWAVE STUDIO [30].…”

Section: Design Of Parallel-bar Cavitymentioning

confidence: 99%

“…The possible luminosity upgrade of the LHC [12] has lately drawn attention to the design of compact crabbing cavity systems operating at low frequencies. Some of those designs are the SLAC half-wave spoke resonator crabbing cavity [13], the parallel-bar cavity [14], the Lancaster University-Cockroft Institute 4-rod cavity [15], the KEK Kota Cavity [16], and the BNL quarter wave cavity [17].…”

Section: Introductionmentioning

confidence: 99%

Design evolution and properties of superconducting parallel-bar rf-dipole deflecting and crabbing cavities

Silva

Delayen

2013

Phys. Rev. ST Accel. Beams

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Deflecting/crabbing cavities serve a variety of purposes in different accelerator applications, primarily in separating a single beam into multiple beams and in rotating bunches for head-on collisions at the interaction point in particle colliders. Deflecting/crabbing cavities are also used for transverse and longitudinal emittance exchange in beams, x-ray pulse compression, and for beam diagnostics. Compact superconducting deflecting/crabbing cavities are under development due to strict dimensional constraints and requirements for higher field gradients with low surface losses. The TEM-like superconducting parallel-bar cavity supports low operating frequencies, thus making the design favorable for many of the deflecting/crabbing cavity applications. The design of the parallel-bar cavity based on cylindrical straight loading elements and rectangular outer conductors has evolved and been adapted to improve the design properties by modifying the design geometry. The improved design with trapezoidalshaped loading elements and cylindrical outer conductor has attractive properties such as low and wellbalanced peak surface fields and high transverse shunt impedance. Additionally, the wide separation of modes in the higher-order mode spectrum and the absence of lower-order mode are advantageous in high current applications. The evolution of the parallel-bar geometry into an rf-dipole geometry is presented with a detailed analysis of the properties for each design.

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“…Design issues specific to high-intensity proton linacs [9] include the complexity of structure assembly, long-term availability, the necessity for low-temperature (2-4K) refrigeration , the lack of proven medium-P accelerating structures, and power coupler limitations. In addition, it is necessary to gain experience in operation of prototype SRF cavity systems with high-current beams.…”

Section: Superconducting Rf Linacsmentioning

confidence: 99%

Transmutation and energy production with high power accelerators

Lawrence

Proceedings Particle Accelerator Conference

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Overview of superconducting RF technology and its application to hiqh-current linacs

Cited by 3 publications

References 13 publications

Cryogenic test of a proof-of-principle superconducting rf-dipole deflecting and crabbing cavity

Cryogenic test of a proof-of-principle superconducting rf-dipole deflecting and crabbing cavity

Design evolution and properties of superconducting parallel-bar rf-dipole deflecting and crabbing cavities

Transmutation and energy production with high power accelerators

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