PRACTICAL EXERIENCES WITH THE 6 GYROTRON SYSTEM ON THE DIII-D TOKAMAK

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OAK-B135 The gyrotron installation on the DIII-D tokamak now comprises six 110 GHz gyrotrons in the 1 MW class, three manufactured by CPI[1] and three by Gycom [2]. Two tetrode rectifier/modulator/regulator power supplies were constructed to provide power for the CPI gyrotrons. A second system uses three mod/reg tetrodes connected in parallel, which are fed by a dual parallel tetrode mod/reg to power the Gycom tubes. the windowless evacuated transmission lines are up to 100 m in length, with 80% transmission efficiency. Engineering solutions were developed in specific problematic areas encountered in the development of this complex system, including: Gyrotron ... continued below

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7 pages

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LOHR,J; CARY,W.P; GORELOV,Y.A; GRUNLOH,H.J; KAJIWARA,K; PEAVY,J.J et al. October 1, 2003.

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OAK-B135 The gyrotron installation on the DIII-D tokamak now comprises six 110 GHz gyrotrons in the 1 MW class, three manufactured by CPI[1] and three by Gycom [2]. Two tetrode rectifier/modulator/regulator power supplies were constructed to provide power for the CPI gyrotrons. A second system uses three mod/reg tetrodes connected in parallel, which are fed by a dual parallel tetrode mod/reg to power the Gycom tubes. the windowless evacuated transmission lines are up to 100 m in length, with 80% transmission efficiency. Engineering solutions were developed in specific problematic areas encountered in the development of this complex system, including: Gyrotron instability; high voltage circuit instability; gyrotron conditioning; rf beam forming and coupling to waveguide; output window vacuum seals; material control; launcher mechanics and diagnosis; polarizer mechanics; dummy loads; power measurements; polarization measurements; cooling; calorimetry; and operating controls. The system is in routine operation in support of tokamak experiments, with peak generated power of about 5 MW at 2 s. pulse length and about 3 MW for 5 s. pulses. This presentation focuses on practical lessons learned in the development and operation of these systems.

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7 pages

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OSTI as DE00823622

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  • 20th IEEE/NPSS SYMPOSIUM ON FUSION ENGINEERING, SAN DIEGO, CA (US), 10/14/2003--10/17/2003; Other Information: TO BE PUBLISHED IN FUSION SCIENCE AND TECHNOLOGY.

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  • Report No.: GA-A24486
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 823622
  • Archival Resource Key: ark:/67531/metadc787970

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  • October 1, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 19, 2016, 12:49 p.m.

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LOHR,J; CARY,W.P; GORELOV,Y.A; GRUNLOH,H.J; KAJIWARA,K; PEAVY,J.J et al. PRACTICAL EXERIENCES WITH THE 6 GYROTRON SYSTEM ON THE DIII-D TOKAMAK, article, October 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc787970/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.