Prototype of Data Acquisition Systems for ITER Divertor Thomson Scattering Diagnostic

Abstract

The prototype of uniquely designed complex data acquisition system for ITER divertor Thomson scattering diagnostic was developed. It allows recording short duration (3-5 ns) scattered pulses with 2 GHz sampling rate and 10-bit total resolution in oscilloscope mode. The system consists of 48 photo detector modules with 0-200 MHz bandwidth, 48 simultaneously sampling ADC modules and synchronization subsystem. The photo detector modules are based on avalanche photodiodes (APD) and ultra-low noise transimpedance amplifiers. ADC modules include fast analog to digital convertors and digital units based on the FPGA (Field-Programmable Gate Array) for data processing and storage. The synchronization subsystem is used to form triggering pulses and to organize the simultaneously mode of ADC modules operation.

The High-Speed Recorder Based on Switch Capacitor Array Technologies for Thomson Scattering Diagnostics in GDT

“…Для получения большего количества точек на сигнале необходимо увеличение этих частот. В среднем же, исходя из обзора существующих в настоящее время регистраторов, диапазон их частот дискретизации лежит в пределах от 500 МГц до 4 ГГц, а амплитудный диапазон -в пределах от 8 до 14 бит [15][16][17].…”

Evaluation of the ITER Real-Time Framework for Data Acquisition and Processing from Pulsed Gigasample Digitizers

“…Research facilities, such as ITER [1][2][3][4], W7-X [5][6][7], KSTAR [8][9][10], ASDEX-U [11,12] or JET [13,14] work on plasma diagnostic systems, which use analogue-to-digital converters (ADCs) sampling with GS/s speed. However, the application of gigasample ADCs could be expensive in such systems, especially when they require large quantities of ADC channels.…”