ABSTRACT
Rotation of the plasma and MHD modes in tokamaks has been shown to stabilize resistive wall and tearing modes as well as improve confinement through suppression of edge turbulence. In this work, we control mode rotation with a biased electrode inserted into the plasma of the High Beta Tokamak-Extended Pulse's facility in conjunction with its active GPU (Graphical Processing Unit) feedback system. We first characterize a negative linear relationship between the electrode voltage and mode rotation. Using this relationship, we design, simulate, and implement a proof-of-concept, GPU-based active-control system, which shows consistent success in controlling mode rotation in both feedforward and feedback operation. Controllability is limited by operating conditions, the electrode's voltage range, and by the electrode's proximity to the vessel's walls. The final control system has a 15 µs cycle time, but the addition of various signal filters results in a full cycle latency of 200 µs.
Subject(s)
Botany/history , Colonialism/history , History, 19th Century , History, 20th Century , India , United KingdomABSTRACT
A 32-year-old woman was treated for Burkitt's lymphoma diagnosed during the 22nd week of pregnancy. Chemotherapy consisting of doxorubicin (Adriamycin), vincristine, teniposide (VM-26), cyclophosphamide, and prednisolone (AVTEP) was given each 2.5 to 3 weeks from the time of the diagnosis until delivery in the 37th week. Bleomycin and intrathecal methotrexate were also given from the 35th week. The infant was born after an assisted vaginal delivery and was fully developed and normal in all respects. This paper confirms prior reports that cytotoxic chemotherapy may safely be given during the second and third trimesters of pregnancy without adverse effects on the fetus. To our knowledge it is the first report of the use of teniposide, a new podophyllin derivative, during pregnancy.
