Improvement of density control by feedback on Langmuir probe signals in Tore Supra ergodic divertor experiments
Real time control of deuterium or helium gas injection by feedback on Langmuir probe signals is implemented in Tore Supra ergodic divertor discharges. The feedback schemes are based on the robust experimental observation that the density limit coincides with the edge temperature Te is approximately 10 eV. Three control algorithms are used: (1) proportional feedback on the central line-averaged density with real-time attenuation of the system gain and security cut-off of the gas injection if the edge temperature becomes too low; (2) proportional feedback on the central line-averaged density with security cut-off controlled by the degree of detachment (DoD); (3) proportional feedback on edge temperature with security cut-off on the DoD. The DoD is defined for deuterium discharges, but not for helium since those do not detach.
Bibliographic Reference: Article: Plasma Physics Controlled Fusion, Vol. 42 (2000) pp. 557-568
Availability: Plasma Physics Controlled Fusion (Journal)
Record Number: 200012299 / Last updated on: 2000-08-10
Original language: en
Available languages: en