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

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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 ... continued below

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20 p.

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Lohr, J.; Ponce, D. & Tooker, J.F. August 1, 1996.

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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.

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20 p.

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INIS; OSTI as DE97003031

Source

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

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  • 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

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  • August 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 6, 2015, 12:21 p.m.

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Lohr, J.; Ponce, D. & Tooker, J.F. Initial tests and operation of a 110 GHz, 1 MW gyrotron with evacuated waveguide system on the DIII-D tokamak, article, August 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc676520/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.