Upgrades and performance of the electron cyclotron heating system on DIII-D

M. Cengher, J. Lohr, Y. A. Gorelov, R. Ellis, Egemen Kolemen, D. Ponce, R. Prater, S. Noraky, C. P. Moeller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Electron Cyclotron Heating (ECH) system on DIII-D consists of six 110 GHz gyrotrons with 6 MW installed power for pulses limited administratively to 5 s in length. The transmission coefficient is better than -1.1 dB for four of the transmission lines, close to the theoretical value. A new depressed collector gyrotron was recently installed and is injecting up to 720 kW of power into DIII-D during 2013 tokamak operations. Three of the four dual waveguide launchers, which can steer the rf beams ±20 degrees both poloidally and toroidally, were used for real-time neoclassical tearing mode control and suppression with increased poloidal scanning speed up to 60 deg/s and positioning accuracy of the beams of ±2 mm at the plasma center. The ECH capabilities on DIII-D are being steadily updated, leading to increased experimental flexibility and high reliability of the system. In the past year the ECH system reliability reached 87%, for 2352 successful individual gyrotron shots into DIII-D. Planning is under way for the addition of two new depressed collector gyrotrons, one at 110 GHz, 1.2 MW and another at 117.5 GHz, 1.5 MW generated power, both of which are being manufactured at Communications and Power Industries (CPI).

Original languageEnglish (US)
Title of host publication2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013
DOIs
StatePublished - Dec 23 2013
Event2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013 - San Francisco, CA, United States
Duration: Jun 10 2013Jun 14 2013

Publication series

Name2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013

Other

Other2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013
CountryUnited States
CitySan Francisco, CA
Period6/10/136/14/13

All Science Journal Classification (ASJC) codes

  • Software

Keywords

  • DIII-D
  • antenna
  • electron cyclotron current drive
  • electron cyclotron heating
  • gyrotron
  • rf transmission line

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    Cengher, M., Lohr, J., Gorelov, Y. A., Ellis, R., Kolemen, E., Ponce, D., Prater, R., Noraky, S., & Moeller, C. P. (2013). Upgrades and performance of the electron cyclotron heating system on DIII-D. In 2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013 [6635387] (2013 IEEE 25th Symposium on Fusion Engineering, SOFE 2013). https://doi.org/10.1109/SOFE.2013.6635387