Microwave reflectometry is an important diagnostic
to characterize the plasma electron density in fusion experiments.
The broadband frequency swept microwave reflectometry system
of the ASDEX Upgrade tokamak covers the frequency range of
16 to 100 GHz. In order to fully exploit the diagnostic capabilities
it is mandatory to upgrade the data acquisition and control
system. It should comply with shorter frequency sweep times and
improved time resolution as well as accuracy allowing, for example,
plasma position and shape measurements for control purposes, as
it is foreseen for ITER. A new PCI-based system is under development
based on a digitizer card with two channels, 12-bit resolution,
and awaveform generator with one channel, 16-bit resolution.
Both cards have 512 Mbytes of memory, a digital signal processor
(DSP) for advanced processing modes, and a field programmable
gate array (FPGA) for real-time algorithms and complex trigger
managing modes. The system is able to support multiple cards (digitizers
and signal generators) operating synchronously at a maximum
rate of 210 MSamples/second. |
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