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Pushing the Capture Limit of Thermionic Gun Linacs

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Pushing the Capture Limit of Thermionic Gun Linacs. / Saitiniyazi, Shadike; Castilla Loeza, Alejandro; McKenzie, Julian et al.
In: Physical Review Accelerators and Beams, Vol. 24, No. 8, 080401, 16.08.2021.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Saitiniyazi, S, Castilla Loeza, A, McKenzie, J, Apsimon, R, Militsyn, B, Angal-Kalinin, D & Burt, G 2021, 'Pushing the Capture Limit of Thermionic Gun Linacs', Physical Review Accelerators and Beams, vol. 24, no. 8, 080401. https://doi.org/10.1103/PhysRevAccelBeams.24.080401

APA

Saitiniyazi, S., Castilla Loeza, A., McKenzie, J., Apsimon, R., Militsyn, B., Angal-Kalinin, D., & Burt, G. (2021). Pushing the Capture Limit of Thermionic Gun Linacs. Physical Review Accelerators and Beams, 24(8), Article 080401. https://doi.org/10.1103/PhysRevAccelBeams.24.080401

Vancouver

Saitiniyazi S, Castilla Loeza A, McKenzie J, Apsimon R, Militsyn B, Angal-Kalinin D et al. Pushing the Capture Limit of Thermionic Gun Linacs. Physical Review Accelerators and Beams. 2021 Aug 16;24(8):080401. doi: 10.1103/PhysRevAccelBeams.24.080401

Author

Saitiniyazi, Shadike ; Castilla Loeza, Alejandro ; McKenzie, Julian et al. / Pushing the Capture Limit of Thermionic Gun Linacs. In: Physical Review Accelerators and Beams. 2021 ; Vol. 24, No. 8.

Bibtex

@article{78a34653392d47b4b2106dfc28a16adb,
title = "Pushing the Capture Limit of Thermionic Gun Linacs",
abstract = "Although accelerator technology has matured sufficiently, state-of-the-art X-ray linacs for radiotherapy and cargo-scanning capture merely 30-50% of the electrons from a thermionic cathode, requiring a higher cathode current and leaving uncaptured electrons to cause problems due to back bombardment, shortening of cathode life, etc. Any solution to increase capture should be effective, simple, reliable, compact, and low cost in order to be adopted by industry. To address this, we present the design of a 6 MeV high capture efficiency S-band electron linac that captures 90% of the initial DC beam. This linac does not require any extra parts that would increase the cost as the high efficiency is achieved via a low-field-amplitude in the first bunching cell to decrease the number of backstreaming electrons, to velocity bunch the electron beam, and recapture backstreaming electrons. Under the low field amplitude, any electrons launched at decelerating phases travel backward with low speeds, thus most of them can catch the next RF cycle, and get re-accelerated/recaptured. As the electron speed is low, the cell length is also shorter than existing linacs. Such a short field is achieved by the use of asymmetric cells with differential coupling to the side-coupled cells. Our novel design has implications for all commercial high current thermionic gun linacs for increasing beam current and increasing cathode lifetime. ",
author = "Shadike Saitiniyazi and {Castilla Loeza}, Alejandro and Julian McKenzie and Robert Apsimon and Boris Militsyn and Deepa Angal-Kalinin and Graeme Burt",
year = "2021",
month = aug,
day = "16",
doi = "10.1103/PhysRevAccelBeams.24.080401",
language = "English",
volume = "24",
journal = "Physical Review Accelerators and Beams",
issn = "2469-9888",
publisher = "American Physical Society",
number = "8",

}

RIS

TY - JOUR

T1 - Pushing the Capture Limit of Thermionic Gun Linacs

AU - Saitiniyazi, Shadike

AU - Castilla Loeza, Alejandro

AU - McKenzie, Julian

AU - Apsimon, Robert

AU - Militsyn, Boris

AU - Angal-Kalinin, Deepa

AU - Burt, Graeme

PY - 2021/8/16

Y1 - 2021/8/16

N2 - Although accelerator technology has matured sufficiently, state-of-the-art X-ray linacs for radiotherapy and cargo-scanning capture merely 30-50% of the electrons from a thermionic cathode, requiring a higher cathode current and leaving uncaptured electrons to cause problems due to back bombardment, shortening of cathode life, etc. Any solution to increase capture should be effective, simple, reliable, compact, and low cost in order to be adopted by industry. To address this, we present the design of a 6 MeV high capture efficiency S-band electron linac that captures 90% of the initial DC beam. This linac does not require any extra parts that would increase the cost as the high efficiency is achieved via a low-field-amplitude in the first bunching cell to decrease the number of backstreaming electrons, to velocity bunch the electron beam, and recapture backstreaming electrons. Under the low field amplitude, any electrons launched at decelerating phases travel backward with low speeds, thus most of them can catch the next RF cycle, and get re-accelerated/recaptured. As the electron speed is low, the cell length is also shorter than existing linacs. Such a short field is achieved by the use of asymmetric cells with differential coupling to the side-coupled cells. Our novel design has implications for all commercial high current thermionic gun linacs for increasing beam current and increasing cathode lifetime.

AB - Although accelerator technology has matured sufficiently, state-of-the-art X-ray linacs for radiotherapy and cargo-scanning capture merely 30-50% of the electrons from a thermionic cathode, requiring a higher cathode current and leaving uncaptured electrons to cause problems due to back bombardment, shortening of cathode life, etc. Any solution to increase capture should be effective, simple, reliable, compact, and low cost in order to be adopted by industry. To address this, we present the design of a 6 MeV high capture efficiency S-band electron linac that captures 90% of the initial DC beam. This linac does not require any extra parts that would increase the cost as the high efficiency is achieved via a low-field-amplitude in the first bunching cell to decrease the number of backstreaming electrons, to velocity bunch the electron beam, and recapture backstreaming electrons. Under the low field amplitude, any electrons launched at decelerating phases travel backward with low speeds, thus most of them can catch the next RF cycle, and get re-accelerated/recaptured. As the electron speed is low, the cell length is also shorter than existing linacs. Such a short field is achieved by the use of asymmetric cells with differential coupling to the side-coupled cells. Our novel design has implications for all commercial high current thermionic gun linacs for increasing beam current and increasing cathode lifetime.

U2 - 10.1103/PhysRevAccelBeams.24.080401

DO - 10.1103/PhysRevAccelBeams.24.080401

M3 - Journal article

VL - 24

JO - Physical Review Accelerators and Beams

JF - Physical Review Accelerators and Beams

SN - 2469-9888

IS - 8

M1 - 080401

ER -