Initial tests and operation of a 110 GHz, 1 MW gyrotron with evacuated waveguide system on the DIII-D tokamak Metadata

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  • Main Title Initial tests and operation of a 110 GHz, 1 MW gyrotron with evacuated waveguide system on the DIII-D tokamak


  • Author: Lohr, J.
    Creator Type: Personal
  • Author: Ponce, D.
    Creator Type: Personal
  • Author: Tooker, J.F.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy. Office of Energy Research.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Energy Research, Washington, DC (United States)


  • Name: General Atomic Co., San Diego, CA (United States)
    Place of Publication: United States


  • Creation: 1996-08-01


  • English


  • Content Description: A gyrotron producing nominally 1 MW at 110 GHz has been installed at the DIII-D tokamak and operated in a program of initial tests with a windowless evacuated transmission line. The alignment and first test operation were performed in an air environment at atmospheric pressure. Under these conditions, the tube produced rf output in excess of 800 kW for pulse lengths greater than 10 msec and power near 500 kW for pulse lengths of about 100 msec into a free space dummy load. The gyrotron was operated into evacuated corrugated waveguide in the full power parameter regime for pulse lengths of up to 500 msec injecting greater than 0.5 MW into DIII-D for a preliminary series of experiments. Generated powers greater than 900 kW were achieved. A parasitic oscillation at various frequencies between 20 and 100 MHz, which was generated during the pulsing of the gyrotron electron beam, was suppressed somewhat by a capacitive filter attached to the gyrotron itself. Addition of a magnetic shield intended to alter the magnetic field geometry below the cathode eliminated internal tube sparks. Rework of the external power and interlock circuitry to improve the immunity to electromagnetic interference was also done in parallel so that the fast interlock circuitry could be used. The latest results of the test program, the design of the free space load and other test hardware, and the transmission line will be presented.
  • Physical Description: 20 p.


  • Keyword: Testing
  • Keyword: Waveguides
  • Keyword: Rf Systems
  • STI Subject Categories: 70 Plasma Physics And Fusion
  • Keyword: Doublet-3 Device
  • Keyword: Non-Inductive Current Drive
  • Keyword: Operation
  • Keyword: Microwave Amplifiers


  • Conference: 3. international workshop on strong microwaves in plasmas, Moscow/St. Petersburg (Russian Federation), 7-14 Aug 1996


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Other: DE97003031
  • Report No.: GA--A22420
  • Report No.: CONF-9608188--1
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 442153
  • Archival Resource Key: ark:/67531/metadc676520


  • Display Note: INIS; OSTI as DE97003031