Feedback compensated 10 kW solid-state pulsed power amplifier at 352 MHz for particle accelerators

Duc, Long Hoang; Jobs, Magnus; Lofnes, Tor; Ruber, Roger; Olsson, Jörgen; Dancila, Dragos

doi:10.1063/1.5110981

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…The amplifier combines SSPA modules at 1.25 kW each, built around a commercially available LDMOS transistor in a single-ended architecture with 71% efficiency in pulsed operation [121]. A feedback-controlled RF power flatness compensation was also demonstrated at a 10 kW level [122].…”

Section: Spoke Cavity Solid-state Power Amplifiers (Sspas)mentioning

confidence: 99%

The European Spallation Source neutrino super-beam conceptual design report

Alekou

Baussan

Bhattacharyya

et al. 2022

Eur. Phys. J. Spec. Top.

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A design study, named $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB for European Spallation Source neutrino Super Beam, has been carried out during the years 2018–2022 of how the 5 MW proton linear accelerator of the European Spallation Source under construction in Lund, Sweden, can be used to produce the world’s most intense long-baseline neutrino beam. The high beam intensity will allow for measuring the neutrino oscillations near the second oscillation maximum at which the CP violation signal is close to three times higher than at the first maximum, where other experiments measure. This will enable CP violation discovery in the leptonic sector for a wider range of values of the CP violating phase $$\delta _{{\mathrm{CP}}}$$ δ CP and, in particular, a higher precision measurement of $$\delta _{{\mathrm{CP}}}$$ δ CP . The present Conceptual Design Report describes the results of the design study of the required upgrade of the ESS linac, of the accumulator ring used to compress the linac pulses from 2.86 ms to 1.2 μs, and of the target station, where the 5 MW proton beam is used to produce the intense neutrino beam. It also presents the design of the near detector, which is used to monitor the neutrino beam as well as to measure neutrino cross sections, and of the large underground far detector located 360 km from ESS, where the magnitude of the oscillation appearance of $$\nu _{e }$$ ν e from $$\nu _{\mu }$$ ν μ is measured. The physics performance of the $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB research facility has been evaluated demonstrating that after 10 years of data-taking, leptonic CP violation can be detected with more than 5 standard deviation significance over 70% of the range of values that the CP violation phase angle $$\delta _{{\mathrm{CP}}}$$ δ CP can take and that $$\delta _{{\mathrm{CP}}}$$ δ CP can be measured with a standard error less than 8° irrespective of the measured value of $$\delta _{{\mathrm{CP}}}$$ δ CP . These results demonstrate the uniquely high physics performance of the proposed $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB research facility.

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Section: Spoke Cavity Solid-state Power Amplifiers (Sspas)mentioning

confidence: 99%

The European Spallation Source neutrino super-beam conceptual design report

Alekou

Baussan

Bhattacharyya

et al. 2022

Eur. Phys. J. Spec. Top.

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“…Proportional and integral loop controllers, with a 6 μs processing time, compensate the droop of the RF output power within the pulse caused by the capacitor bank powering the transistors. The variation of the uncompensated power amplitude is on the order of 1 kW, while the compensated variation over the pulse is only 20 W, which is equivalent to 0.2% [31]. No instabilities appeared during 4 h test runs while the temperature stabilized at the transistor and combiner [32].…”

Section: Solid-state Amplifier Developmentmentioning

confidence: 94%

“…An eight-transistor based technology demonstrator was constructed and operated successfully with feedback compensation for an optimized output pulse stability [30,31]. To reduce losses, the output of each transistors is tuned within 0.5 dB gain and 5 • phase.…”

Section: Solid-state Amplifier Developmentmentioning

confidence: 99%

Accelerator development at the FREIA Laboratory

et al. 2021

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The FREIA Laboratory at Uppsala University focuses on superconducting technology and accelerator development. It actively supports the development of the European Spallation Source, CERN, and MAX IV, among others. FREIA has developed test facilities for superconducting accelerator technology such as a double-cavity horizontal test cryostat, a vertical cryostat with a novel magnetic field compensation scheme, and a test stand for short cryomodules. Accelerating cavities have been tested in the horizontal cryostat, crab-cavities cavities in the vertical cryostat, and cryomodules for ESS on the cryomodule test stand. High power radio-frequency amplifier prototypes based on vacuum tube technology were developed for driving spoke cavities. Solid-state amplifiers and power combiners are under development for future projects. We present the status of the FREIA Laboratory complemented with results of recent projects and future prospects.

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“…The amplifier combines 8-kW level SSPA modules, built around a commercially available LDMOS transistor in a single-ended architecture, each module characterized by and efficiency of 71% in pulsed operation [12]. A feedback-controlled RF power flatness compensation at a 10 kW level was also demonstrated [13].…”

Section: Sspa Development At Freiamentioning

confidence: 99%

The conceptual design of the high-efficiency 400 kW solid-state power station at 352 MHz for the European spallation source

Mohadeskasaei,

Dancila

2024

Int. J. Microw. Wireless Technol.

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This paper introduces an innovative conceptual design of a 400 kW solid-state power amplifier (SSPA) station and presents preliminary measurements for the key components. Recent advancements and benefits of solid-state technology have made the prospect of replacing vacuum tubes increasingly appealing. Historically, a significant challenge was the limited output power capacity of individual solid-state transistors, necessitating the integration of numerous units to generate high-power microwave signals in the range of hundreds of kilowatts. However, modern transistors capable of producing over 2 kW of output power have emerged, facilitating this transition. Another weak point was low power efficiency in high-power operating mode. The advanced rugged technology (ART) of solid-state devices enables the utilization of these transistors in nonlinear and switching operating classes, thereby enabling the creation of high-efficiency high-power amplifiers. In this conceptual design, 264 SSPA modules based on ART, each with a power output of 1.6 kW, are combined. The measurements revealed a single SSPA capable of delivering up to 2 kW output power with a power efficiency of 73% at frequency of 352 MHz. Due to the minimal losses during module combination and working SSPA in Class-C operation mode, the power efficiency of the station is expected to closely mirror that of a single module.

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Feedback compensated 10 kW solid-state pulsed power amplifier at 352 MHz for particle accelerators

Cited by 7 publications

References 16 publications

The European Spallation Source neutrino super-beam conceptual design report

The European Spallation Source neutrino super-beam conceptual design report

Accelerator development at the FREIA Laboratory

The conceptual design of the high-efficiency 400 kW solid-state power station at 352 MHz for the European spallation source

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