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DIII-D Electron Cyclotron Heating and Current Drive System Status and Plans

Journal Article · · IEEE Transactions on Plasma Science
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2]
  1. General Atomics, San Diego, CA (United States); General Atomics
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
+ Show Author Affiliations
The DIII-D 110 GHz Electron Cyclotron Heating and Current Drive (ECH/ECCD) System supports a wide range of experiments at the DIII-D National Fusion Facility and is pioneering innovative new techniques for future fusion reactors. Here, the system currently includes 8 sockets with 4 installed gyrotrons, 31.75 mm circular corrugated transmission lines, four dual real time steerable launchers plus two Top Launchers. After the successful testing of the first Top Launcher, that injects the EC waves downward nearly parallel to the resonance layer with double current drive efficiency and a long absorption path, a second new Top Launcher was designed and installed with an upgraded design. Some of the operational limitations encountered for the 110 GHz X-mode second harmonic resonance scenario launched in over-dense plasmas were overcome with the alternative use of O-mode second harmonic launch. Two new gyrotrons in a new series manufactured by CPI were installed and tested, bringing up the total installed power to 3 MW. The installation of repaired and new gyrotrons will increase the number of installed gyrotrons to 7 in 2023. An addition to the DIII-D building will be completed in early 2022 to provide the space to expand the ECH/ECCD system to ten gyrotron systems, plus an extra gyrotron test socket.
Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FC02-04ER54698
OSTI ID:
1963716
Journal Information:
IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 11 Vol. 50; ISSN 0093-3813
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

References (6)

Recent Tests on 117.5 GHz and 170 GHz Gyrotrons journal January 2015
Top Launch for Higher Off-axis Electron Cyclotron Current Drive Efficiency journal January 2019
Design of a dual high-power, long pulse, steerable ECH launcher for DIII-D conference January 2001
Doubling off-axis electron cyclotron current drive efficiency via velocity space engineering journal March 2022
Performance and Upgrades for the Electron Cyclotron Heating System on DIII-D journal July 2014
Status and Plans for the DIII-D ECH/ECCD System journal June 2020

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Microwave tubes
plasma heating
tokamaks