The feasibility and very good performance of a kilowatt-level power amplifier in single-ended architecture, intended for energy systems are demonstrated. prototype is designed at 352 MHz the ESS LINAC delivers 1250 W with 71% efficiency pulsed operation duty cycle 5%, 3.5 ms pulse 14 Hz repetition.

Abstract This paper outlines an experimental demonstration of envelope tracking (ET) technique applied to a kilowatt-level single-ended solid-state power amplifier (SSPA), aimed at enhancing the charging efficiency superconducting radio frequency (SRF) cavities by reducing reflection while maintaining high degree efficiency. The is particularly designed for pulsed operation European Spallation Source (ESS) nominal 352 MHz, with 5% duty cycle and pulse width 3.5 ms. study introduces optimal...

We present radio frequency (RF) and thermal characterization of a compact 12-way power combiner designed for operation at 352 MHz level 100 kW with 5% duty factor. The is based on reentrant cavity 12 input doorknob couplers one output coupler that integrated the post forms type geometry. introduce convenient design formulas allow easy identification suitable parameter space, which then refined numerical simulations. Low-power RF measurements prototype show 0.2% insertion loss relative rms...

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 SSPA is based on eight resonant single-ended kilowatt modules combined using planar Gysel combiner. Each two-stepped impedance matching, allowing harmonic suppression, simple massive production, high-performance design. A methodology to tune optimum combining efficiency presented thoroughly in time domain. We...

A compact 10 kW RF power amplifier at 352 MHz was developed FREIA for the European Spallation Source, ESS. The specifications of ESS conception amplifiers are related to its pulsed operation: 3.5 ms pulse length and a duty cycle 5%. realized is composed eight kilowatt level modules, combined using planar Gysel 8-way combiner. combiner has low insertion loss only 0.2 dB, measured peak power. Each module built around commercially available LDMOS transistor in singleended architecture. During...

Abstract This paper presents the time‐domain characterization of high power pulsed solid state amplifiers to be used for linear accelerator applications. The study comprises nonlinear circuit envelope simulations and time domain measurements. Measurements are performed under conditions (3.5 ms pulse width, 5% duty cycle) specific European Spallation Source (ESS) intensity proton accelerator. We measure characteristics LDMOS based such as: droop along pulse, efficiency, average amplitude...

This study presents a new two-way Gysel combiner based on an air-dielectric stripline which allows to handle very high radio-frequency power levels with low-loss suitable for combination in accelerator applications. The insertion loss of the is 0.1 dB (2%). A thick implementation improving capability both continuous wave (CW) and pulsed operation. In addition, mechanical tuner compensating assembly fabrication discrepancies. methodology designing as well high-power measurements up 22 kW mode...

This paper demonstrates a high-efficiency kilowatt-level Class E RF power amplifier which is designed as source for particle accelerator energy systems. method of switch mode feathers employed here to improve efficiency such high kilowatts PA in single chip. It uses powerful LDMOS-transistor single-ended design and provides 1200 W peak with 83% drain 19.9 dB gain at 100 MHz operation. In addition it 1010 87% 20.4 102 All measurements were performed pulsed operation 5% duty cycle, 3.5 ms...

This paper demonstrates a high-efficiency kilowatt-level Class E RF power amplifier which is designed as source for particle accelerator energy systems. method of switch mode feathers employed here to improve efficiency such high kilowatts PA in single chip. It uses powerful LDMOS-transistor single-ended design and provides 1200 W peak with 83% drain 19.9 dB gain at 100 MHz operation. In addition it 1010 87% 20.4 102 All measurements were performed pulsed operation 5% duty cycle, 3.5 ms...

The paper presents a wideband 3-dB quadrature coupler designed for operation at 2 GHz. presented is based on broadside-coupled suspended structure in combination with proposed defected ground (DGS) allowing high power, wide-band and improved harmonic suppression performance. experimental results show 0.2 dB of insertion loss, return loss better than 18 isolation 25 the frequency range from 1.74 to 2.67 able be integrated status data transmitting system, which suitable vessel monitoring....

In this paper, we introduces the configuration of a high-power solid- state transmitter to be used for modern radar system operating at UHF band (820Mhz – 900Mhz). Specially, power amplifier module (150W output power) does play critically important role in such being consisting two-stage 90W-and-200W that allows reach up 1.2kW per block, and even approximate 9.6 kW whole using classical combination method. Our work mainly targets present study, design, fabrication both 150-Watt basic...