High power 170 GHz test of CVD diamond for ECH window
| Autor: | Masaki Tsuneoka, Atsushi Kasugai, Tsuyoshi Imai, O. Braz, Koji Takahashi, Manfred Thumm, Keishi Sakamoto |
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| Rok vydání: | 1997 |
| Předmět: |
Radiation
Materials science business.industry Cyclotron Diamond Chemical vapor deposition engineering.material Condensed Matter Physics Electron cyclotron resonance law.invention Nuclear magnetic resonance law Gyrotron Extremely high frequency engineering Optoelectronics Continuous wave Dielectric loss Electrical and Electronic Engineering business Instrumentation |
| Zdroj: | International Journal of Infrared and Millimeter Waves. 18:1495-1503 |
| ISSN: | 1572-9559 0195-9271 |
| Popis: | In order to check the usability of large-size CVD (Chemical Vapor Deposition) diamond disks for high power millimeter wave vacuum barrier windows at room temperature (T = 293 K) a first series of experiments, using a 170 GHz, 0.4 MW, 0.2 s JAERI/Toshiba gyrotron1), have been performed. The dielectric loss tangent at a frequency of 170 GHz has been determined to be tan δ = 1.3·10−4. By comparing the experimental results to numerical simulations the thermal conductivity was estimated to be about k ≈ 1800 W/mK. This preliminary results indicate that a single-disk CVD diamond window assembly using a water-edge cooling could fulfill the requirements for a continuous wave (CW) transmission of millimeter wave power in the megawatt range. This is needed for the Electron Cyclotron Heating (ECH) on the International Thermonuclear Experimental Reactor (ITER). |
| Databáze: | OpenAIRE |
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