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Description
A 4 kW continuous-wave (CW) LDMOS-based solid-state power amplifier (SSPA) has been developed for the low-energy superconducting linear accelerator (SCL3) at the IBS heavy-ion accelerator facility. The system provides RF power to 81.25 MHz quarter-wave resonators (QWRs) and 162.5 MHz half-wave resonators (HWRs). The amplifier features a modular parallel architecture comprising six 1000 W PA pallets integrated via a multi-stage RF combining network. To ensure reliability against cavity detuning and impedance mismatches, a dual reflection-protection scheme utilizing both pallet-level and high-power output circulators was implemented. Performance evaluations demonstrated a saturated CW output power above 4 kW, a power gain of 70.4 dB, and an AC-to-RF efficiency of 54%. Harmonic and spurious emissions were suppressed below −34.8 dBc and −75 dBc, respectively. Long-term stability tests over 12 hours with a ±1 °C coolant temperature fluctuation yielded output variations within ±1% and phase deviations within ±5°. Additionally, full-reflection tests under OPEN and SHORT conditions confirmed stable operation at the rated power without protection trips. These results verify that the developed SSPA satisfies the stringent requirements for superconducting cavity operations and is highly suitable for continuous accelerator operations.
Footnotes
- J. Kim et al., New Phys.: Sae Mulli 66 (2016) 1491.
** Y. He et al., NIM A 1055 (2023) 168403.
Funding Agency
This work is supported by the Rare Isotope Science Project of Institute for Basic Science funded by Ministry of Science, ICT and Future Planning and National Research Foundation of Korea (2013M7A1A107
| Classification | MC6: Applications and diagnostics |
|---|---|
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