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Baiao, D.; Medina, F.; Ochando, M.; McCarthy, K.; Tabares, F.; Pastor, I.; Varandas, C. |
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Title |
Central electron temperature estimations of TJ-II neutral beam injection heated plasmas based on the soft x ray multi-foil technique |
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Journal Article |
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2012 |
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Review Of Scientific Instruments |
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Rev. Sci. Instrum. |
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83 |
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5 |
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053501 |
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Abstract |
The core electron temperature (Te-0) of neutral beam heated plasmas is determined in TJ-II stellarator by using soft x ray detectors with beryllium filters of different thickness, based on the method known as the foil absorption technique. Te-0 estimations are done with the impurity code IONEQ, making use of complementary information from the TJ-II soft x ray tomography and the VUV survey diagnostics. When considering the actual electron density and temperature profile shapes, an acceptable agreement is found with Thomson scattering measurements for 8 different magnetic configurations. The impact of the use of both neutral beam injectors on the Te-0 measurements is addressed. Also, the behaviour of Te-0 during spontaneous profile transitions is presented. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4714340] |
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0034-6748 |
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WOS:000304821500022 |
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1174 |
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