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Search: WFRF:(Wedberg Rolf) > (2015)

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1.
  • Bhattacharyya, Anirban, et al. (author)
  • ESS RF Source and Spoke Cavity Test Plan
  • 2015
  • Reports (other academic/artistic)abstract
    • This report describes the test plan for the first high power RF source, ESS prototype double spoke cavity and ESS prototype cryomodule at the FREIA Laboratory.
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2.
  • Jobs, Magnus, et al. (author)
  • Itelco-Electrosys 400 kW RF Station Site Acceptance Test
  • 2015
  • Reports (pop. science, debate, etc.)abstract
    • The manufactured and delivered Itelco-Electrosys 400 kW RF station was tested on site at FREIA, in Uppsala August 31 through September 4 2015. The station could successfully deliver continuous pulsetrains with a power-level up to 400 kW. Each of the stations 200 kW tetrode based amplifier sections were mounted with TH-595 tetrode tubes from Thales and tuned for optimal performance. The gain of the tetrode amplifiers were roughly 15 dB with some variation between the two amplifier sections andthe overall gain was approximately 85 dB maximum.Some droop and phase distortion on the combined output pulse was measured caused primarily by a limited response time of the screen-grid power supply.
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3.
  • Olvegård, Maja, et al. (author)
  • PROGRESS AT THE FREIA LABORATORY
  • 2015
  • In: Proceedings of IPAC'15. - JACoW : The Joint Accelerator Conferences Website.
  • Conference paper (peer-reviewed)abstract
    • The FREIA Facility for Research Instrumentation and Accelerator Development at Uppsala University, Sweden, has reached the stage where the testing of superconducting cavities for the European Spallation Source (ESS) is starting. The new helium liquefaction plant has been commissioned and now supplies a custom-made, versatile horizontal cryostat, HNOSS, with liquid helium at up to 140 l/h. The cryostat has been designed and built to house up to two accelerating cavities, or, later on, other superconducting equipment such as magnets or crab cavities. A prototype cavity for the spoke section of the ESS linac will arrive mid 2015 for high-power testing in the horizontal cryostat. Two tetrode-based commercial RF power stations will deliver 400 kW peak power each, at 352 MHz, to the cavity through an RF distribution line developed at FREIA. In addition, significant progress has been made with in-house development of solid state amplifier modules and powercombiners for future use in particle accelerators. We report here on these and other ongoing activities at the FREIA laboratory.
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