Speaker
Description
WEST, the Tungsten Environment Steady state Tokamak at IRFM (France), is currently being equipped with two new plasma-monitoring systems based on Thomson Scattering. The intensity and spectrum of the scattered fraction of photons of an incident LASER pulse holds information on the density and temperature of electrons in the plasma, which are two essential parameters for plasma physics and real-time plasma control. Nearly fifty optical viewing lines will be installed to collect diffused light near the core plasma region and in the plasma pedestal. This contribution will describe and discuss the performances of the real-time data acquisition and processing system to which the collected pulses of Thomson scattered light are propagated. Classically, it consists of one polychromator and one Nectarine data acquisition board for each viewing line, all located in thermo-regulated cubicles. The Nectarine board is a custom design adapted to the polychromators : it provides six triggered fast channels to catch the scattered pulse shape at a minimum of 1 GS/s thanks to three Nectar chips. Six further ADC channels are provided for background monitoring at a slower rate (100 KS/s). Nectarine was designed as a baseboard for a Microzed, Avnet’s open source System On Module based on Xilinx’s Zynq SoC. The Zynqs are in charge of system configuration and control thanks to the embedded firmware and standalone lwip TCP/IP clients and of data readout and transfer to the backend PC via UDP. The backend runs a TCP/IP and UDP server within the WEST framework.
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