Quasi-optical output for a high gain, broadband W-band amplifier

C. R. Donaldson; G. M. Smith; D. A. Robertson; C. W. Robertson; L. Zhang; P. MacInnes; C. G. Whyte

doi:10.1109/irmmw-thz50927.2022.9895885

Quasi-optical output for a high gain, broadband W-band amplifier

C. R. Donaldson, G. M. Smith, D. A. Robertson, C. W. Robertson, L. Zhang, P. MacInnes, C. G. Whyte

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

Abstract

The gyrotron-traveling wave amplifier (gyro-TWA), operating in W-band has previously been shown to provide an unsaturated output power of 3.4 kW over a 3-dB bandwidth of 9196.5 GHz in single pulse (350 ns) operation. The output section of the gyro-TWA was critical to maintaining the amplifier stability due to the 37 dB gain from a single gain section. This paper presents the re-design of the gyro-TWA output section suitable for several percent duty cycle and wideband operation over 90-100 GHz. We describe the design of the: wideband smooth output feedhorn, which couples to a fundamental Gaussian mode; the electron beam collector (forming part of the output horn), and the vacuum window. The feedhorn simulations predict a calculated >98% Gaussian efficiency and better than -30 dB return loss. The vacuum window is a multilayer design comprising three window discs: two quartz and one alumina. The predicted return loss is lower than -30 dB over the operating range.

Original language	English
Title of host publication	2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Publisher	IEEE
ISBN (Electronic)	9781728194271
DOIs	https://doi.org/10.1109/irmmw-thz50927.2022.9895885
Publication status	Published - 26 Sept 2022

Keywords

high gain amplifiers
W-band amplifier
quasi optical outputs

Access to Document

10.1109/irmmw-thz50927.2022.9895885

Cite this

@inproceedings{9c2a15857d1e4182a08f429e237027ef,

title = "Quasi-optical output for a high gain, broadband W-band amplifier",

abstract = "The gyrotron-traveling wave amplifier (gyro-TWA), operating in W-band has previously been shown to provide an unsaturated output power of 3.4 kW over a 3-dB bandwidth of 9196.5 GHz in single pulse (350 ns) operation. The output section of the gyro-TWA was critical to maintaining the amplifier stability due to the 37 dB gain from a single gain section. This paper presents the re-design of the gyro-TWA output section suitable for several percent duty cycle and wideband operation over 90-100 GHz. We describe the design of the: wideband smooth output feedhorn, which couples to a fundamental Gaussian mode; the electron beam collector (forming part of the output horn), and the vacuum window. The feedhorn simulations predict a calculated >98% Gaussian efficiency and better than -30 dB return loss. The vacuum window is a multilayer design comprising three window discs: two quartz and one alumina. The predicted return loss is lower than -30 dB over the operating range.",

keywords = "high gain amplifiers, W-band amplifier, quasi optical outputs",

author = "Donaldson, {C. R.} and Smith, {G. M.} and Robertson, {D. A.} and Robertson, {C. W.} and L. Zhang and P. MacInnes and Whyte, {C. G.}",

year = "2022",

month = sep,

day = "26",

doi = "10.1109/irmmw-thz50927.2022.9895885",

language = "English",

booktitle = "2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)",

publisher = "IEEE",

}

TY - GEN

T1 - Quasi-optical output for a high gain, broadband W-band amplifier

AU - Donaldson, C. R.

AU - Smith, G. M.

AU - Robertson, D. A.

AU - Robertson, C. W.

AU - Zhang, L.

AU - MacInnes, P.

AU - Whyte, C. G.

PY - 2022/9/26

Y1 - 2022/9/26

N2 - The gyrotron-traveling wave amplifier (gyro-TWA), operating in W-band has previously been shown to provide an unsaturated output power of 3.4 kW over a 3-dB bandwidth of 9196.5 GHz in single pulse (350 ns) operation. The output section of the gyro-TWA was critical to maintaining the amplifier stability due to the 37 dB gain from a single gain section. This paper presents the re-design of the gyro-TWA output section suitable for several percent duty cycle and wideband operation over 90-100 GHz. We describe the design of the: wideband smooth output feedhorn, which couples to a fundamental Gaussian mode; the electron beam collector (forming part of the output horn), and the vacuum window. The feedhorn simulations predict a calculated >98% Gaussian efficiency and better than -30 dB return loss. The vacuum window is a multilayer design comprising three window discs: two quartz and one alumina. The predicted return loss is lower than -30 dB over the operating range.

AB - The gyrotron-traveling wave amplifier (gyro-TWA), operating in W-band has previously been shown to provide an unsaturated output power of 3.4 kW over a 3-dB bandwidth of 9196.5 GHz in single pulse (350 ns) operation. The output section of the gyro-TWA was critical to maintaining the amplifier stability due to the 37 dB gain from a single gain section. This paper presents the re-design of the gyro-TWA output section suitable for several percent duty cycle and wideband operation over 90-100 GHz. We describe the design of the: wideband smooth output feedhorn, which couples to a fundamental Gaussian mode; the electron beam collector (forming part of the output horn), and the vacuum window. The feedhorn simulations predict a calculated >98% Gaussian efficiency and better than -30 dB return loss. The vacuum window is a multilayer design comprising three window discs: two quartz and one alumina. The predicted return loss is lower than -30 dB over the operating range.

KW - high gain amplifiers

KW - W-band amplifier

KW - quasi optical outputs

U2 - 10.1109/irmmw-thz50927.2022.9895885

DO - 10.1109/irmmw-thz50927.2022.9895885

M3 - Conference contribution book

BT - 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

PB - IEEE

ER -

Quasi-optical output for a high gain, broadband W-band amplifier

Abstract

Keywords

Access to Document

Fingerprint

Cite this