Simulated plasma facing component measurements for an in situ surface diagnostic on Alcator C-Mod.
نویسندگان
چکیده
The ideal in situ plasma facing component (PFC) diagnostic for magnetic fusion devices would perform surface element and isotope composition measurements on a shot-to-shot (∼10 min) time scale with ∼1 μm depth and ∼1 cm spatial resolution over large areas of PFCs. To this end, the experimental adaptation of the customary laboratory surface diagnostic--nuclear scattering of MeV ions--to the Alcator C-Mod tokamak is being guided by ACRONYM, a Geant4 synthetic diagnostic. The diagnostic technique and ACRONYM are described, and synthetic measurements of film thickness for boron-coated PFCs are presented.
منابع مشابه
Tungsten Measurement on Alcator C-Mod and EBIT for Future Fusion Reactors
Tungsten will be an important element in nearly all future fusion reactors because of its presence in plasma facing components. This makes tungsten a good candidate for a diagnostic element for ion temperature and toroidal velocity measurement, and it makes understanding tungsten emissions important for tokamak power balance. The effect of tungsten on tokamak plasmas is investigated at the Alca...
متن کاملPFC / JA - 94 - 012 Plasma - Surface Interactions in the Alcator C - Mod Tokamak
Alcator C-Mod is a high-field tokamak with which experiments were initiated in April 1993. The divertor and the first-wall have plasma-facing surfaces of molybdenum. The divertor has a configuration which is closed in comparison to other, currently operating tokamaks. The combination of divertor geometry and high field (density) make Alcator C-Mod an ideal experiment to investigate dissipative ...
متن کاملICRF Specific Impurity Sources and Plasma Sheaths in Alcator C-Mod
In Alcator C-Mod, we have sought to identify ICRF specific impurity sources and estimate the lifetime of thin, low Z films in the presence of high power ICRF heating. With ICRF, the erosion rate of low-Z films is estimated to be 15-20 nm/s indicating the eroding species energy is much higher than that normally found in the SOL. Using emissive probes, plasma potential measurements confirm the pr...
متن کاملIn-Situ Gas Conductance and Flow Measurements Through Alcator C-Mod Divertor Structures With and Without Plasma Present
A specialized arrangement of gas-puff capillaries and in-situ pressure gauges has been installed in Alcator C-Mod to allow gas conductances and flows around divertor structures to be measured with or without plasma present in the chamber. Results are presented from a series of dedicated experiments performed during the 1020725 run day (MP#313, " Instrumented Divertor Leakage Experiments "). Gas...
متن کاملInfluence of boronization on operation with high-Z plasma facing components in Alcator C-Mod
We report the results of operation of Alcator C-Mod with all high-Z molybdenum Plasma Facing Component (PFC) surfaces. Without boron-coated PFCs energy confinement was poor (HITER,89 ~ 1) due to high core molybdenum (nMo/ne 0.1%) and radiation. After applying boron coatings, nMo/ne was reduced by a factor of 10-20 with HITER,89 approaching 2. Results of between-discharge boronization, localized...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- The Review of scientific instruments
دوره 81 10 شماره
صفحات -
تاریخ انتشار 2010