Impurity generation in the Tore Supra outboard pump limiter
- Oak Ridge National Lab., TN (United States)
- Association Euratom-CEA, Saint Paul-lez-Durance (France)
The generation of impurities due to plasma interaction with graphite surfaces has been the focus of a great deal of study. The authors present results from an experiment in which the plasma-surface conditions can be relatively well characterized. Impurity spectroscopic observations have been made in the throat region of the Outboard Pump Limiter in Tore Supra. The temperature of the neutralizer plate can be estimated from measurements of the temperature of the front face of this limiter and extensive thermal modeling using the actual limiter geometry. The plasma conditions are characterized by Langmuir probe measurements in the pump limiter throat, approximately 10 cm from the emitting surface. The full visible region of impurity emission is observed spectroscopically. These observations lead to the identification of hydrocarbon generation from chemical sputtering processes. Modeling with a 3D impurity transport code (BBQ) allows a comparison with expected emission due to chemical sputtering.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10173161
- Report Number(s):
- CONF-930720--17; ON: DE93017771
- Country of Publication:
- United States
- Language:
- English
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Measurements and modeling of impurity source distributions from the Tore Supra outboard pump limiter
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