Speaker
Description
ALBA is a 3rd generation synchrotron light source and is member of the RF2.0 project, which aims to reduce the carbon footprint of this kind of large research facilities by improving its efficiency, reliability and operational sustainability. In this contribution, we present the work done together with our partner COMMTIA, that has developed the Adaptive Power and Digital Control (APDC) for a 5 kW 1.5 GHz SSPA amplifier, which enables a real-time efficiency optimization by changing dynamically the drain voltage of the transistors while delivering RF power. This is done in two different ways: either the SSPA sets the desired voltage as function of the output power or the Digital Low Level RF system sets the voltage to the SSPA by means of a digital signal. This maximizes the efficiency at each point of operation, ensuring stable performance under the varying load and thermal environments common on accelerator facilities. Also, we present a temptative class-C design of a single transistor pallet that can be use as unitary amplification stage for larger SSPA’s.
The laboratory measurements indicate for both proof of concepts substantial improvements in wall-plug efficiency, that comes with the cost of the SSPA linearity gain reduction. These developments show how flexible solid-state RF systems can satisfy demanding high-performance requirements while lowering the energy consumption and carbon footprint of accelerator infrastructures.
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