System efficiency analysis for high power solid state radio frequency transmitter

Jain, Akhilesh; Sharma, Deepak Kumar; Gupta, Alok Kumar; Lad, M.; Hannurkar, P.R.; Pathak, S. K.

doi:10.1063/1.4866649

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…The efforts proceed for better efficiency and output power at component level. However, we still need to improve the reliability and system efficiency causing from the imbalance both in phase and amplitude at system level, which affects the basic parameters of output power such as efficiency and output reflection coefficient [19][20][21][22].…”

Section: Resultsmentioning

confidence: 99%

“…Variations in phase become more dominant in efficiency degradation in comparison to the effect of the variations in amplitude [19]. Besides many reasons like the amplitude/phase imbalance which occurs due to disturbances in the RF amplifier itself, mismatching/reflections at the bending and ending points of the high power RF cable, ambient conditions like water-cooling line temperature and pressure may cause degradation in efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Long term stability of 1.3 GHz high power RF amplifier

Karslı¹,

Colak²

2021

Turk J Elec Eng & Comp Sci

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Turkish Accelerator and Radiation LAboratory (TARLA) is an accelerator based oscillator mode free electron laser (FEL) facility under construction. The acceleration beam-line includes a fundamental buncher (FB) in order to confine the electron beam into a compressed bunch. In this study, we demonstrate the commissioning tests of 500 W RF amplifier powering FB and present the phase stability dependence of the pressure and temperature of the water cooling line under long time run conditions. As the disturbing effects break down the synchronization between the particle and RF power during acceleration, the reasons disquieting the stability of the RF amplifier are investigated. One reason which disturbs the stability is the variation in the phase of the output power. Phase variation of the output power of the RF amplifier measured as ∼ 10 deg/ • C in average initially, which is beyond permitted variation levels by the controller electronics, namely the Low Level RF system (LLRF), is decreased to less than ∼ 0.45 deg/ • C by incorporating a phase shifter. In addition, this phase variation reduction is accompanied with a reflected power at the output of the RF amplifier decline from 4.3 W (36.33 dBm) down to 3 mW (4.7 dBm) by utilizing a circulator, which is also important and desirable in terms of protection of the electronics in the long term run. As ensuring phase stability in the output power is very important, this work may serve as a guide since the documentation regarding the output power dependence of the water cooling line for long term run is very limited.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Long term stability of 1.3 GHz high power RF amplifier

Karslı¹,

Colak²

2021

Turk J Elec Eng & Comp Sci

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Compact dual-channel radio frequency power sensor for solid state amplifiers

Sharma

Jain

Pathak

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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

Duc

Jobs

Lofnes

et al. 2019

Review of Scientific Instruments

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This paper presents the first results of an in-house developed low-level radio frequency (LLRF) system and a 10 kW solid state power amplifier (SSPA). The design approach for the SSPA is based on eight resonant single-ended kilowatt modules combined using a planar Gysel combiner. Each of the single-ended modules is based on a two-stepped impedance resonant matching, allowing for harmonic suppression, simple design for massive production, and high-performance design. A design methodology to tune SSPA modules for optimum combining efficiency is presented thoroughly in the time domain. We characterize the power droop due to capacitor banks in the time domain. In open loop of compensation, it is about 1 kW within the pulse of peak value 10 kW and a duration of 3.5 ms. This may lead to the beam instability of the accelerator as particles are not provided with the same energy during the pulse. By incorporating our LLRF system, it is demonstrated that the objective of amplitude and phase stability is satisfied, as required in the European Spallation Source proton accelerator. The presented design also offers the advantages of compact form factor, low complexity, and better performance. In closed loop compensation, the variation of amplitude (pulse droop) is measured on the order of 20 W, which is equivalent to 0.2% at 10 kW peak output power.

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System efficiency analysis for high power solid state radio frequency transmitter

Cited by 7 publications

References 25 publications

Long term stability of 1.3 GHz high power RF amplifier

Long term stability of 1.3 GHz high power RF amplifier

Compact dual-channel radio frequency power sensor for solid state amplifiers

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

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