{"title":"Active heater control and regulation for the Varian VGT-80 11 gyrotron","authors":"T. E. Harris","doi":"10.1109/FUSION.1991.218934","DOIUrl":null,"url":null,"abstract":"On past DIII-D experiments involving the use of Varian VA-8060 gyrotrons for ECH (electron cyclotron heating) power, significant gyrotron heater-emission depletion was experienced for pulse widths >300 ms. This decline in heater-emission directly results in gyrotron-cathode current droop. Since RF power from gyrotrons decreases as cathode current decreases, it is necessary to maintain a constant cathode current level during gyrotron pulses for efficient gyrotron operation. Therefore, it was determined that a filament-heater control system should be developed for the Varian VGT-8011 gyrotron which will include cathode-current feedback. The author discusses the mechanisms used to regulate gyrotron filament-heater voltage by using cathode-current feedback. A 110 GHz ECH system has been completed and is operational using the active filament-heater control and regulation network that has been developed.<<ETX>>","PeriodicalId":318951,"journal":{"name":"[Proceedings] The 14th IEEE/NPSS Symposium Fusion Engineering","volume":"41 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"[Proceedings] The 14th IEEE/NPSS Symposium Fusion Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FUSION.1991.218934","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
On past DIII-D experiments involving the use of Varian VA-8060 gyrotrons for ECH (electron cyclotron heating) power, significant gyrotron heater-emission depletion was experienced for pulse widths >300 ms. This decline in heater-emission directly results in gyrotron-cathode current droop. Since RF power from gyrotrons decreases as cathode current decreases, it is necessary to maintain a constant cathode current level during gyrotron pulses for efficient gyrotron operation. Therefore, it was determined that a filament-heater control system should be developed for the Varian VGT-8011 gyrotron which will include cathode-current feedback. The author discusses the mechanisms used to regulate gyrotron filament-heater voltage by using cathode-current feedback. A 110 GHz ECH system has been completed and is operational using the active filament-heater control and regulation network that has been developed.<>
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