Transmission Line Components for a Future Millimeter-Wave Highgradient Linear Accelerator

Hirshfield, J. L.; Богдашов, А. А.; Chirkov, A. V.; Денисов, Г. Г.; Fix, A.; Kuzikov, S. V.; LaPointe, M. A.; Litvak, A. G.; Lukovnikov, Denis; Малыгин, В. И.; Nezhevenko, O.A.; Petelin, M. I.; Rodin, Yu.V.; Serdobintsev, G. V.; Shmelyov, M.Yu.; Yakovlev, V.P.

doi:10.1007/1-4020-3638-8_12

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Another factor concerned a lot is the power density distribution of the dummy load [11,[13][14][15]. To avoid the appearance of thermal fatigue cracks, the power density distribution of the dummy load is always required to be uniform.…”

Section: The Reflection Coefficient Of the Cooling Pipementioning

confidence: 99%

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

Xiong

Xia

Huang

et al. 2022

Plasma Sci. Technol.

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Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The dummy load is one of the significant equipment for the millimeter wave power measurement. In this paper, The dummy load is analyzed based on the quasi-optical method and the ray tracing method. The reflectivity and thermal deposition of the dummy load has been considered to ensure the safety of the whole system. High-power tests have been carried out at a 105 GHz/500 kW ECRH system. The results of the tests indicate that the dummy load is stable and valid.

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Section: The Reflection Coefficient Of the Cooling Pipementioning

confidence: 99%

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

Xiong

Xia

Huang

et al. 2022

Plasma Sci. Technol.

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“…The circuit also requires high-power windows, mode converters from WR-28 waveguide to circular waveguide in the TE01 mode, and high power load. All this equipment is developed and built [26,27]. The photo of the high-power Ka-band load operating at the TE01 mode is shown in Fig.…”

Section: Iiih Experimental Test Setupmentioning

confidence: 99%

“…Because the magnicon has four outputs with nearly equal power [2], a power combiner is needed to feed the switch. The Ka -band power combiner capable to operate with the full design magnicon power of 40 MW is developed and built at Omega-P [26], the photo is shown in Fig. 18.…”

Section: Iiih Experimental Test Setupmentioning

confidence: 99%

Ferroelectric switch for a high-power Ka-band active pulse compressor

Hirshfield¹

2013

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Abstract:Results are presented for design of a high-power microwave switch for operation at 34.3 GHz, intended for use in an active RF pulse compressor. The active element in the switch is a ring of ferroelectric material, whose dielectric constant can be rapidly changed by application of a high-voltage pulse. As envisioned, two of these switches would be built into a pair of delay lines, as in SLED-II at SLAC, so as to allow 30-MW μs-length Ka-band pulses to be compressed in time by a factor-of-9 and multiplied in amplitude to generate 200 MW peak power pulses. Such high-power pulses could be used for testing and evaluation of high-gradient mm-wave accelerator structures, for example. Evaluation of the switch design was carried out with an X-band (11.43 GHz) prototype, built to incorporate all the features required for the Kaband version.

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State-of-the-Art of High-Power Gyro-Devices and Free Electron Masers

Thumm

2020

J Infrared Milli Terahz Waves

291

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STATE-OF-THE-ART OF HIGH POWER GYRO-DEVICES AND FREE ELECTRON MASERSAt present, gyrotron oscillators are mainly used as high power millimeter wave sources for electron cyclotron resonance heating (ECRH) and diagnostics of magnetically confmed plasmas for generation of energy by controlled thermonuclear fusion. 140 GHz gyrotrons with output power Pout = 0.58 MW, pulse length 't = 2.0 s and efficiency 11 = 34 % are commercially available. Diagnostic gyrotrons deliver P out = 40 kW with 't = 40 J-lS at frequencies up to 650 GHz (11 2_ 4 %). Recently, gyrotron oscillators have also been successfully used in matedal processing and plasma chemistry. Such technological applications require gyrotrons with the following parameters: f 2. 28 GHz , Pout = 10-30 kW, CW, 11 2. 30 %. This paper reports on achievements and problems related to the development of very high power mm-wave gyrotrons for long pulse or CW operation and describes the microwave technological pecularities of the different development steps. In addition, this work gives a short overview of the present development of gyrotrons for technological applications, quasi-optical gyrotrons, cyclotron autoresonance masers (CARMs), gyro-ldystrons, gyro-TWT amplifiers, gyro-BWO's and free electron masers (FEMs). The most impressive FEM output parameters are: Pout = 2GW, 't = 20 ns, 11 = 13 % at 140 GHz (LLNL) and Pout = 15 kW, 't = 20 J-tS, 11 = 5 % in the range from 120 to 900 GHz (UCSB). ENTWICKLUNGSSTAND VON HOCHLEISTUNGS-GYRO-RÖHREN UND FREI-ELEKTRONEN-MASERN Übersiebt Gyrotronoszillatoren werden derzeit vorwiegend als Hochleistungsmillimeterwellenquellen für die Elektron-Zyklotron-Resonanzheizung (ECRH) und Diagnostik von magnetisch eingeschlossenen Plasmen zur Erforschung der Energiegewinnung durch kontrollierte Kernfusion eingesetzt. 140 GHz Gyrotrons mit einer Ausgangsleistung von Pout = 0.58 MW bei Pulslängen von 't = 2.0 s und Wirkungsgraden von • 11 = 34% sind kommerziell erhältlich. Gyrotrons zur Plasmadiagnostik erreichen Frequenzen bis zu 650 GHz bei P out = 40 kW und 't = 40 ~-ts (11 2. 4 %). In jüngster Zeit jedoch finden Gyrotronoszillatoren auch für technologische Prozesse und in der Plasmachemie erfolgreich Verwendung. Dabei werden Röhren mit folgenden Parametern eingesetzt: f 2_ 28 GHz, Pout = 10-30 kW, CW, 11 2. 30 %. In diesem Beitrag wird auf den aktuellen Stand und die Probleme bei der Entwicklung von Hochleistungs-mm-Wellen-Gyrotrons für Langpuls-und Dauerstrichbetrieb sowie auf die mikrowellentechnischen Besonderheiten der einzelnen Entwicklungsphasen eingegangen: Außerdem wird auch kurz über den neuesten Stand der Entwicklung von Gyrotrons für technologische Anwendungen, quasi-optischen Gyrotrons, Zyklotron-Autoresonanz-Masern (CARMs), Gyroklystrons, Gyro-TWT-Verstärkern, Gyro-Rückwärtswellenoszillatoren (BWOs) und Frei-Elektronen-Maser (FEM) berichtet. FEM-Rekordausgangsparameter sind hier: Pout = 2 GW, 't = 20 ns, 11 = 13 % bei 140 GHz (LLNL) und Pout = 15 kW, 't = 20 J-lS, 11 = 5 % im Bereich von 120 bis 900 GHz (UCSB). Contents

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Transmission Line Components for a Future Millimeter-Wave Highgradient Linear Accelerator

Cited by 4 publications

References 4 publications

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

Ferroelectric switch for a high-power Ka-band active pulse compressor

State-of-the-Art of High-Power Gyro-Devices and Free Electron Masers

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