Klystron 'efficiency loop' for the ALS storage ring RF system

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The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design considerations, besides efficiency improvement, were to interface to the existing system without major expense. They were to also avoid the klystron cathode power ... continued below

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Kwiatkowski, Slawomir; Julian, Jim & Baptiste, Kenneth May 20, 2002.

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Description

The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design considerations, besides efficiency improvement, were to interface to the existing system without major expense. They were to also avoid the klystron cathode power supply filter's resonance in the loop's dynamics, and prevent a conflict with the existing Cavity RF Amplitude Loop dynamics. This efficiency loop will allow us to save up to 700 MW-hours of electrical energy per year and increase the lifetime of the klystron.

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INIS; OSTI as DE00799603

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  • EPAC 2002, PARIS (FR), 06/03/2002--06/07/2002

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  • Report No.: LBNL--50405
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 799603
  • Archival Resource Key: ark:/67531/metadc734221

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 20, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • Sept. 1, 2016, 7 p.m.

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Kwiatkowski, Slawomir; Julian, Jim & Baptiste, Kenneth. Klystron 'efficiency loop' for the ALS storage ring RF system, article, May 20, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc734221/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.