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RF High Power Amplifiers for FREIA – ESS: design, fabrication and measurements
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (FREIA)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (FREIA)
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

The FREIA laboratory is a Facility for REsearch Instrumentation and Acceleratior development at Uppsala University, Sweden, constructed recently to test and develop superconducting accelerating cavities and their high power RF sources. FREIA's activity target initially the European Spallation Source (ESS) requirements for testing spoke cavities and RF power stations, typically 400 kW per cavity. Different power stations will be installed at the FREIA laboratory. The first one is based on vacuum tubes and the second on a combination of solid state modules. In this context, we investigate different related aspects, such as power generation and power combination. For the characterization of solid state amplifier modules in pulsed mode, at ESS specifications, we implement a Hot Sparameter measurement set-up, allowing in addition the measurement of different parameters such as gain and efficiency. Two new solid state amplifier modules are designed, constructed and measured at 352 MHz, using commercially available LDMOS transistors. Preliminary results show a drain efficiency of 71 % at 1300 W pulsed output power. The effects of changing quiescent current (IDq) and drain voltage are investigated, aswell as the possibilities to combine several modules together.

Place, publisher, year, edition, pages
2014. , 50 p.
UPTEC F, ISSN 1401-5757 ; 14 024
Keyword [en]
RF power amplifier, ESS, 352 MHz
National Category
Accelerator Physics and Instrumentation
URN: urn:nbn:se:uu:diva-263549OAI: oai:DiVA.org:uu-263549DiVA: diva2:858587
Available from: 2015-10-13 Created: 2015-10-02 Last updated: 2015-10-13Bibliographically approved

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