skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The DIII-D 3 MW, 110 GHz ECH System

Abstract

Three 110 GHz gyrotrons with nominal output power of 1 MW each have been installed and are operational on the DIII-D tokamak. One gyrotron is built by Gycom and has a nominal rating of 1 MW and a 2 s pulse length, with the pulse length being determined by the maximum temperature allowed on the edge cooled Boron Nitride window. The second and third gyrotrons were built by Communications and Power Industries (CPI). The first CPI gyrotron uses a double disc FC-75 cooled sapphire window which has a pulse length rating of 0.8 s at 1 MW, 2s at 0.5 MW and 10s at 0.35 MW. The second CPI gyrotron, utilizes a single disc chemical-vapor-deposition diamond window, that employs water cooling around the edge of the disc. Calculation predict that the diamond window should be capable of full 1 MW cw operation. All gyrotrons are connected to the tokamak by a low-loss-windowless evacuated transmission line using circular corrugated waveguide for propagation in the HEl 1 mode. Each waveguide system incorporates a two mirror launcher which can steer the rf beam poloidally from the center to the outer edge of the plasma. Central current drive experiments with the two gyrotrons withmore » 1.5 MW of injected power drove about 0.17 MA. Results from using the three gyrotron systems will be reported as well as the plans to upgrade the system to 6 MW.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
766946
Report Number(s):
GA-A23082
TRN: AH200134%%278
DOE Contract Number:  
AC03-99ER54463
Resource Type:
Conference
Resource Relation:
Conference: 13th Topical Conference on Applications of Radio Frequency Power to Plasmas, Annapolis, MD (US), 04/12/1999--04/14/1999; Other Information: PBD: 1 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 36 MATERIALS SCIENCE; BORON NITRIDES; CHEMICAL VAPOR DEPOSITION; DIAMONDS; DOUBLET-3 DEVICE; MICROWAVE AMPLIFIERS; POWER TRANSMISSION LINES; SAPPHIRE; WATER; WAVEGUIDES; WINDOWS

Citation Formats

Callis, R W, Lohr, J, Ponce, D, O'Neill, R C, Prater, R, and Luce, T C. The DIII-D 3 MW, 110 GHz ECH System. United States: N. p., 1999. Web.
Callis, R W, Lohr, J, Ponce, D, O'Neill, R C, Prater, R, & Luce, T C. The DIII-D 3 MW, 110 GHz ECH System. United States.
Callis, R W, Lohr, J, Ponce, D, O'Neill, R C, Prater, R, and Luce, T C. 1999. "The DIII-D 3 MW, 110 GHz ECH System". United States. https://www.osti.gov/servlets/purl/766946.
@article{osti_766946,
title = {The DIII-D 3 MW, 110 GHz ECH System},
author = {Callis, R W and Lohr, J and Ponce, D and O'Neill, R C and Prater, R and Luce, T C},
abstractNote = {Three 110 GHz gyrotrons with nominal output power of 1 MW each have been installed and are operational on the DIII-D tokamak. One gyrotron is built by Gycom and has a nominal rating of 1 MW and a 2 s pulse length, with the pulse length being determined by the maximum temperature allowed on the edge cooled Boron Nitride window. The second and third gyrotrons were built by Communications and Power Industries (CPI). The first CPI gyrotron uses a double disc FC-75 cooled sapphire window which has a pulse length rating of 0.8 s at 1 MW, 2s at 0.5 MW and 10s at 0.35 MW. The second CPI gyrotron, utilizes a single disc chemical-vapor-deposition diamond window, that employs water cooling around the edge of the disc. Calculation predict that the diamond window should be capable of full 1 MW cw operation. All gyrotrons are connected to the tokamak by a low-loss-windowless evacuated transmission line using circular corrugated waveguide for propagation in the HEl 1 mode. Each waveguide system incorporates a two mirror launcher which can steer the rf beam poloidally from the center to the outer edge of the plasma. Central current drive experiments with the two gyrotrons with 1.5 MW of injected power drove about 0.17 MA. Results from using the three gyrotron systems will be reported as well as the plans to upgrade the system to 6 MW.},
doi = {},
url = {https://www.osti.gov/biblio/766946}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: