Authors
Linyan Rong, Zhencheng Mu, Hexin Wang, Hui Zhang, Zhexin Xie, Maliang Wan, Bo Wang, Kai Guo, Zixian Liu
Published in
The Review of scientific instruments. Volume 97. Issue 8. Aug 01, 2026.
Abstract
In the Phase II upgrade of the China Spallation Neutron Source, the linac system will achieve a beam energy upgrade from 80 to 300 MeV through the implementation of twenty 324 MHz spoke superconducting radio frequency (SRF) cavities and twenty-four 648 MHz elliptical SRF cavities. Each spoke cavity requires a dedicated solid-state power amplifier (SSPA) delivering 300 kW peak RF power at a pulse width of 1.2 ms and a repetition rate of 50 Hz. This paper presents the development and experimental validation of a novel pulsed GaN (Gallium Nitride) based SSPA system that employs high-power GaN HEMTs (high-electron-mobility transistors), a redundant direct-current supply subsystem, a compact power-combining network, and a modular architecture. The first prototype SSPA has been successfully built and tested. Measurement results demonstrate that the GaN-based PA modules provide 130% higher output power than conventional laterally diffused metal-oxide-semiconductor (LDMOS) technology at 324 MHz, thereby reducing the number of required amplifier units by 50% while maintaining sufficient power margin. The system exhibits excellent reliability, availability, and operational flexibility, meeting all design specifications.
PMID:
42599148
Bibliographic data and abstract were imported from PubMed on 14 Aug 2026.
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