15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

2.18 Real-Time Digital Phase Demodulator for the ITER Toroidal Interferometer and Polarimeter (TIP)

16 Apr 2018, 10:45
2h 15m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Randy Allen Colio (Palomar Scientific Instruments) D.F. Finkenthal (Palomar Scientific Instruments) M.A. Van Zeeland (General Atomics) T.N. Carlstrom (General Atomics) A. Gatusso (General Atomics) R. O'Neill (General Atomics) R.L. Boivin (General Atomics) D. Johnson (Princeton Plasma Physics Laboratory)

Description

The ITER TIP system requires real time phase demodulation of several radio-frequency (RF) signals to provide accurate electron density measurements essential for plasma control. This is accomplished using a four-channel digital phase demodulator (DPD) constructed using a high-density Field Programmable Gate Array (FPGA) coupled to high-speed analog-to-digital converters (ADC). The DPD samples signals from four optical detectors each containing frequencies at 4, 40, and 44MHz. Digital signal processing (DSP) techniques are used to separate the three frequencies and measure their phase. Two versions of DPDs have been constructed and tested on the DIII-D TIP system. The first was fabricated using a Xilinx Kintex-7 FPGA development board, a high-speed ADC module from Analog Devices, and custom hardware from Palomar Scientific Instruments. The second was assembled using ITER-approved components from National Instruments. The FPGA implementation for both versions was designed using Matlab System Generator and the VHDL programming language. Both systems have been shown to provide phase measurements with better than 0.01º accuracy at 500kHz bandwidth. Work supported by U.S. DOE Contracts DE-AC-02-09CH11466 and DE-FC02-04ER54698.

Primary author

Randy Allen Colio (Palomar Scientific Instruments)

Co-authors

D.F. Finkenthal (Palomar Scientific Instruments) M.A. Van Zeeland (General Atomics) T.N. Carlstrom (General Atomics) A. Gatusso (General Atomics) R. O'Neill (General Atomics) R.L. Boivin (General Atomics) D. Johnson (Princeton Plasma Physics Laboratory)

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