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Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods

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

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Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods. / Cowie, L.; McKenzie, J.; Burt, G.
In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1064, 169464, 31.07.2024.

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

Harvard

Cowie, L, McKenzie, J & Burt, G 2024, 'Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1064, 169464. https://doi.org/10.1016/j.nima.2024.169464

APA

Cowie, L., McKenzie, J., & Burt, G. (2024). Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1064, Article 169464. https://doi.org/10.1016/j.nima.2024.169464

Vancouver

Cowie L, McKenzie J, Burt G. Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2024 Jul 31;1064:169464. Epub 2024 May 29. doi: 10.1016/j.nima.2024.169464

Author

Cowie, L. ; McKenzie, J. ; Burt, G. / Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2024 ; Vol. 1064.

Bibtex

@article{5717cb04aeb1481997a4d7d1d4e9a480,
title = "Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods",
abstract = "An rf pulse propagating through a travelling wave linac can be seen to evolve due to dispersion. To accurately predict the field amplitude experienced by electron bunches travelling through the cavity, this pulse evolution must be well known. Here we present an method to predict the pulse evolution using Fourier methods. The method requires two inputs to calculate the dispersion: the group velocity as a function of cell number, and the phase advance. Attenuation is included in the model with the addition of a third input: the cavity Q0. The method is faster and more simple than 3D modelling, and allows subtle details of the pulse evolution to be revealed, without the need to know the exact dimensions of the structure. A synchronism condition can be added to predict the voltage experienced by a particle beam. The model is tested on the first CLARA linac, and shows good agreement both with measurements of the rf pulse and with measurements of the beam momentum as the time of beam injection is varied. ",
keywords = "Analytical modelling, RF dispersion, RF structures, Travelling wave linacs, 3D modeling, Forecasting, Linear accelerators, Wave transmission, Analytical modeling, Field amplitudes, Fourier methods, Measurements of, Pulse evolution, RF pulse, RF structure, Traveling wave linac, Travelling waves, Dispersion (waves)",
author = "L. Cowie and J. McKenzie and G. Burt",
note = "Export Date: 6 June 2024 CODEN: NIMAE Correspondence Address: Cowie, L.; ASTeC, Daresbury, Cheshire, United Kingdom; email: louise.cowie@stfc.ac.uk",
year = "2024",
month = jul,
day = "31",
doi = "10.1016/j.nima.2024.169464",
language = "English",
volume = "1064",
journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "ELSEVIER SCIENCE BV",

}

RIS

TY - JOUR

T1 - Calculation of RF pulse evolution due to dispersion in travelling wave linacs using Fourier methods

AU - Cowie, L.

AU - McKenzie, J.

AU - Burt, G.

N1 - Export Date: 6 June 2024 CODEN: NIMAE Correspondence Address: Cowie, L.; ASTeC, Daresbury, Cheshire, United Kingdom; email: louise.cowie@stfc.ac.uk

PY - 2024/7/31

Y1 - 2024/7/31

N2 - An rf pulse propagating through a travelling wave linac can be seen to evolve due to dispersion. To accurately predict the field amplitude experienced by electron bunches travelling through the cavity, this pulse evolution must be well known. Here we present an method to predict the pulse evolution using Fourier methods. The method requires two inputs to calculate the dispersion: the group velocity as a function of cell number, and the phase advance. Attenuation is included in the model with the addition of a third input: the cavity Q0. The method is faster and more simple than 3D modelling, and allows subtle details of the pulse evolution to be revealed, without the need to know the exact dimensions of the structure. A synchronism condition can be added to predict the voltage experienced by a particle beam. The model is tested on the first CLARA linac, and shows good agreement both with measurements of the rf pulse and with measurements of the beam momentum as the time of beam injection is varied.

AB - An rf pulse propagating through a travelling wave linac can be seen to evolve due to dispersion. To accurately predict the field amplitude experienced by electron bunches travelling through the cavity, this pulse evolution must be well known. Here we present an method to predict the pulse evolution using Fourier methods. The method requires two inputs to calculate the dispersion: the group velocity as a function of cell number, and the phase advance. Attenuation is included in the model with the addition of a third input: the cavity Q0. The method is faster and more simple than 3D modelling, and allows subtle details of the pulse evolution to be revealed, without the need to know the exact dimensions of the structure. A synchronism condition can be added to predict the voltage experienced by a particle beam. The model is tested on the first CLARA linac, and shows good agreement both with measurements of the rf pulse and with measurements of the beam momentum as the time of beam injection is varied.

KW - Analytical modelling

KW - RF dispersion

KW - RF structures

KW - Travelling wave linacs

KW - 3D modeling

KW - Forecasting

KW - Linear accelerators

KW - Wave transmission

KW - Analytical modeling

KW - Field amplitudes

KW - Fourier methods

KW - Measurements of

KW - Pulse evolution

KW - RF pulse

KW - RF structure

KW - Traveling wave linac

KW - Travelling waves

KW - Dispersion (waves)

U2 - 10.1016/j.nima.2024.169464

DO - 10.1016/j.nima.2024.169464

M3 - Journal article

VL - 1064

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

SN - 0168-9002

M1 - 169464

ER -