No abstract

No abstract

The existing VxWorks real time system for the position and shape control in ASDEX Upgrade has been extended to calculate magnetic flux surfaces in real time using a multi-core PCI Express system running LabVIEW RT 8.6. Real time signal processing of bolometers and manometers is performed with the on-board FPGA to calculate the measured radiated power flux and particle flux respectively from the raw data. Radiation feedback experiments use halo current measurements from the outer divertor with real time median filter pre-processing to remove the excursions produced by ELM's. Integration of these plasma diagnostics into the control system by the exchange of XML sheets for communicating the real time variables to be produced and consumed is in operation. Reflective memory and UDP are employed by the LabVIEW RT plasma diagnostics to communicate with the control system and other plasma diagnostics in a multi-platform real time network.

The existing real time system for the position and shape control in ASDEX Upgrade has been extended to calculate magnetic flux surfaces in real time using a multi-core PCI Express system running LabVIEW RT. The availability of reflective memory for LabVIEW RT will allow this system to be connected to the control system and other diagnostics in a multiplatform real time network. The measured response of each magnetic probe to the individual poloidal field coil currents in the absence of plasma current is compared to the calculated value. Prior to a tokamak discharge this comparison can be used to check for failure of the magnetic probe, flux loop or integrator.

An atomic absorption spectrophotometry method for the determination of selenium in animal feed premixes is described. The method involves digesting the samples by heating with perchloric acid and hydrogen peroxide. No pre-concentration or separation is required other than filtering the insoluble material remaining after digestion. Concentrations from 0.0057 to 0.42% selenium were measured. The relative standard deviation over this range averaged 4.6%. A matrix effect, which could be overcome by either preparing the standards with a matrix or using the standard addition technique, was noted at ≤0.02% selenium. The results obtained by each method and by x-ray fluorescence are shown and compared with the claimed selenium content. When the matrix effect is overcome, results by atomic absorption spectroscopy and x-ray fluorescence agree within 15% or better at all levels.