{"title":"Recent DIII-D neutral beam calibration results","authors":"J. Wight, R. Hong, J. Phillips","doi":"10.1109/FUSION.1991.218824","DOIUrl":null,"url":null,"abstract":"The fundamental parameters by which injected DIII-D neutral beam power is calculated have all been recently measured using waterflow calorimetry and target tile thermocouples. The measured neutralization efficiency is 66%, close to the modeled equilibrium value of 70% for a 75 kV deuterium beam. Waterflow calorimetry has proven to be a useful tool to measure the neutralization efficiency, contrary to earlier results. The beamline transmission efficiency has been measured for each beam independently, and averages about 78% among the beams. Finally, the drift duct reionization survival rate is 95%. By making use of the independence of preshot target tile temperature and duct reionization, interpretation of thermocouple data has yielded more accurate results.<<ETX>>","PeriodicalId":318951,"journal":{"name":"[Proceedings] The 14th IEEE/NPSS Symposium Fusion Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"[Proceedings] The 14th IEEE/NPSS Symposium Fusion Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FUSION.1991.218824","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
The fundamental parameters by which injected DIII-D neutral beam power is calculated have all been recently measured using waterflow calorimetry and target tile thermocouples. The measured neutralization efficiency is 66%, close to the modeled equilibrium value of 70% for a 75 kV deuterium beam. Waterflow calorimetry has proven to be a useful tool to measure the neutralization efficiency, contrary to earlier results. The beamline transmission efficiency has been measured for each beam independently, and averages about 78% among the beams. Finally, the drift duct reionization survival rate is 95%. By making use of the independence of preshot target tile temperature and duct reionization, interpretation of thermocouple data has yielded more accurate results.<>
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