Development of a high-energy crowbar for the Los Alamos free-electron laser

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A 135-kV, 2.5-..mu..s crowbar has been developed to protect the TH2095A klystrons used on the Los Alamos free-electron laser. The klystron power supply consists of a 135-kV, 8.75-..mu..F capacitor bank with a stored energy of approximately 80 kJ. The TH2095A specifications require that the dissipated energy in a klystron arc be limited to less than 10J. The crowbar design is based upon a series stack of pressurized spark gaps immersed in an oil tank. The spark gaps are triggered by an SCR-switched high-voltage trigger transformer. Input triggers are provided by current-monitoring transformers. The following currents are sensed for input triggers: ... continued below

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Pages: 13

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Hornkohl, J.O. & Lynch, M.T. January 1, 1987.

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Description

A 135-kV, 2.5-..mu..s crowbar has been developed to protect the TH2095A klystrons used on the Los Alamos free-electron laser. The klystron power supply consists of a 135-kV, 8.75-..mu..F capacitor bank with a stored energy of approximately 80 kJ. The TH2095A specifications require that the dissipated energy in a klystron arc be limited to less than 10J. The crowbar design is based upon a series stack of pressurized spark gaps immersed in an oil tank. The spark gaps are triggered by an SCR-switched high-voltage trigger transformer. Input triggers are provided by current-monitoring transformers. The following currents are sensed for input triggers: total system current, integrated system current (long pulse sensing), cathode current, and modulator-anode current. Trigger levels are set to approximately 150% of nominal current levels. Unique features of this design are its modulator-anode trigger, noise immunity, and ability to print out the energy dissipated in the klystron arc. Typical operation of this system limits the energy dissipated in an arc to less than 2J. This paper describes the original design requirements, mechanical layout and fabrication, main trigger circuit design, modulator-anode trigger design, noise immunity circuit, integrated energy monitor, diagnostics, and recent developments. Performance data are also included. 1 ref., 6 figs.

Physical Description

Pages: 13

Notes

NTIS, PC A02/MF A01; 1.

Source

  • 9. international free-electron laser conference, Williamsburg, VA, USA, 14 Sep 1987

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  • Other: DE87014748
  • Report No.: LA-UR-87-2882
  • Report No.: CONF-8709110-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6134213
  • Archival Resource Key: ark:/67531/metadc1111577

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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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Creation Date

  • January 1, 1987

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 22, 2018, 7:39 p.m.

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Hornkohl, J.O. & Lynch, M.T. Development of a high-energy crowbar for the Los Alamos free-electron laser, article, January 1, 1987; United States. (digital.library.unt.edu/ark:/67531/metadc1111577/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.