Discharge cleaning on TFTR after boronization
| العنوان: | Discharge cleaning on TFTR after boronization |
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| المؤلفون: | Mueller, D., Dylla, H.F., LaMarche, P.H., Bell, M.G., Blanchard, W., Bush, C.E., Gentile, C., Hawryluk, R.J., HIll, K.W., Janos, A.C., Jobes, F.C, Owens, D.K., Pearson, G., Schivell, J., Ulrickson, M.A., Vannoy, C., Wong, K.L. |
| سنة النشر: | 2011 |
| المجموعة: | SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
| مصطلحات موضوعية: | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY, LIMITERS, CLEANING, BORON, CARBON, COMPOSITE MATERIALS, FIRST WALL, GLOW DISCHARGES, HEATING, TFTR TOKAMAK, ELECTRIC DISCHARGES, ELEMENTS, MATERIALS, NONMETALS, SEMIMETALS, THERMONUCLEAR REACTOR WALLS, THERMONUCLEAR REACTORS, TOKAMAK TYPE REACTORS |
| الوصف: | At the beginning of the 1990 TFTR experimental run, after replacement of POCO-AXF-5Q graphite tiles on the midplane of the bumper limiter by carbon fiber composite (CFC) tiles and prior to any Pulse Discharge Cleaning (PDC), boronization was performed. Boronization is the deposition of a layer of boron and carbon on the vacuum vessel inner surface by a glow discharge in a diborane, methane and helium mixture. The amount of discharge cleaning required after boronization was substantially reduced compared to that which was needed after previous openings when boronization was not done. Previously, after a major shutdown, about 10{sup 5} low current ({approximately}20 kA) Taylor Discharge Cleaning (TDC) pulses were required before high current ({approximately}400 kA) aggressive Pulse Discharge Cleaning (PDC) pulses could be performed successfully. Aggressive PDC is used to heat the limiters from the vessel bakeout temperature of 150{degrees}C to 250{degrees}C for a period of several hours. Heating the limiters is important to increase the rate at which water is removed from the carbon limiter tiles. After boronization, the number of required TDC pulses was reduced to <5000. The number of aggressive PDC pulses required was approximately unchanged. 14 refs., 1 tab. |
| نوع الوثيقة: | other/unknown material |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| Relation: | http://www.osti.gov/servlets/purl/5617720; https://www.osti.gov/biblio/5617720; https://doi.org/10.2172/5617720 |
| DOI: | 10.2172/5617720 |
| الاتاحة: | http://www.osti.gov/servlets/purl/5617720 https://www.osti.gov/biblio/5617720 https://doi.org/10.2172/5617720 |
| رقم الانضمام: | edsbas.BF157FC1 |
| قاعدة البيانات: | BASE |
| DOI: | 10.2172/5617720 |
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