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Damping of unwanted modes in SRF deflecting/crabbing cavities

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Damping of unwanted modes in SRF deflecting/crabbing cavities. / Burt, Graeme; Wang, H.
In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 734, No. Part A, 11.01.2014, p. 65-71.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Burt, G & Wang, H 2014, 'Damping of unwanted modes in SRF deflecting/crabbing cavities', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 734, no. Part A, pp. 65-71. https://doi.org/10.1016/j.nima.2012.12.068

APA

Burt, G., & Wang, H. (2014). Damping of unwanted modes in SRF deflecting/crabbing cavities. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 734(Part A), 65-71. https://doi.org/10.1016/j.nima.2012.12.068

Vancouver

Burt G, Wang H. Damping of unwanted modes in SRF deflecting/crabbing cavities. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2014 Jan 11;734(Part A):65-71. Epub 2013 Jan 8. doi: 10.1016/j.nima.2012.12.068

Author

Burt, Graeme ; Wang, H. / Damping of unwanted modes in SRF deflecting/crabbing cavities. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2014 ; Vol. 734, No. Part A. pp. 65-71.

Bibtex

@article{31c9fb1c9862411296efbe95c787a5ff,
title = "Damping of unwanted modes in SRF deflecting/crabbing cavities",
abstract = "As deflecting and crab cavities do not use the fundamental acceleration mode for their operation, the spectrum of unwanted modes is significantly different from that of accelerating cavities. The fundamental acceleration mode is now unwanted and can cause energy spread in the beam; in addition this mode frequency is often close to or lower than that of the deflecting mode, making it difficult to damp. This is made more complex in some of the compact crab cavities as there small beampipes often attenuate the fields very sharply. In addition in some crab cavities there can be an orthogonal transverse mode similar to the deflecting mode, known as the same order mode. The degeneracy of these modes must be split by polarising the cavity and if the polarisation is not large enough, dampers should be placed at either an electric or magnetic field null of the crabbing mode to effectively damp the unwanted polarisation. Various concepts for dealing with unwanted modes in various SRF deflecting cavities will be reviewed.",
keywords = "Crab cavities, Higher order modes, Deflecting cavities",
author = "Graeme Burt and H. Wang",
year = "2014",
month = jan,
day = "11",
doi = "10.1016/j.nima.2012.12.068",
language = "English",
volume = "734",
pages = "65--71",
journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
publisher = "ELSEVIER SCIENCE BV",
number = "Part A",

}

RIS

TY - JOUR

T1 - Damping of unwanted modes in SRF deflecting/crabbing cavities

AU - Burt, Graeme

AU - Wang, H.

PY - 2014/1/11

Y1 - 2014/1/11

N2 - As deflecting and crab cavities do not use the fundamental acceleration mode for their operation, the spectrum of unwanted modes is significantly different from that of accelerating cavities. The fundamental acceleration mode is now unwanted and can cause energy spread in the beam; in addition this mode frequency is often close to or lower than that of the deflecting mode, making it difficult to damp. This is made more complex in some of the compact crab cavities as there small beampipes often attenuate the fields very sharply. In addition in some crab cavities there can be an orthogonal transverse mode similar to the deflecting mode, known as the same order mode. The degeneracy of these modes must be split by polarising the cavity and if the polarisation is not large enough, dampers should be placed at either an electric or magnetic field null of the crabbing mode to effectively damp the unwanted polarisation. Various concepts for dealing with unwanted modes in various SRF deflecting cavities will be reviewed.

AB - As deflecting and crab cavities do not use the fundamental acceleration mode for their operation, the spectrum of unwanted modes is significantly different from that of accelerating cavities. The fundamental acceleration mode is now unwanted and can cause energy spread in the beam; in addition this mode frequency is often close to or lower than that of the deflecting mode, making it difficult to damp. This is made more complex in some of the compact crab cavities as there small beampipes often attenuate the fields very sharply. In addition in some crab cavities there can be an orthogonal transverse mode similar to the deflecting mode, known as the same order mode. The degeneracy of these modes must be split by polarising the cavity and if the polarisation is not large enough, dampers should be placed at either an electric or magnetic field null of the crabbing mode to effectively damp the unwanted polarisation. Various concepts for dealing with unwanted modes in various SRF deflecting cavities will be reviewed.

KW - Crab cavities

KW - Higher order modes

KW - Deflecting cavities

U2 - 10.1016/j.nima.2012.12.068

DO - 10.1016/j.nima.2012.12.068

M3 - Journal article

VL - 734

SP - 65

EP - 71

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

IS - Part A

ER -