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Real-Time Ethernet Interface for NSTX-U’s Thomson Scattering Diagnostic (2023)

Journal Article · · IEEE Transactions on Plasma Science
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  1. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
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Here, the multipoint Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade (NSTX-U) facility is undergoing an upgrade to operate in real-time and interface with the plasma control system (PCS) for NSTX-U. Previous prototyping efforts have shown that spectral analysis and rapid calculations of electron temperature and density are possible on a real-time Linux machine when using up to a 100-Hz laser pulse repetition rate. A remaining challenge was transferring the real-time data to NSTX-U’s PCS, which utilizes the front panel data port (FPDP) protocol. The original proposed method was to convert the real-time data into analog values, but a new solution was developed to keep the output format digital by using an Ethernet controller with a field-programmable gate array (FPGA). This article focuses on a new input module that has been developed to accept incoming user datagram protocol (UDP) packets sent over Ethernet, convert into FPDP format, and integrate into the existing data stream under NSTX-U’s real-time framework.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOC; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
2441282
Journal Information:
IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 6 Vol. 52; ISSN 0093-3813
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

References (6)

NSTX-U Control System Upgrades journal June 2014
NSTX-U advances in real-time deterministic PCIe-based internode communication journal August 2018
A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U journal April 2019
Development of Real-Time Software for Thomson Scattering Analysis at NSTX-U journal September 2019
A poloidal high-k scattering system for NSTX-U journal January 2022
FPGA Based Solution For Ethernet Controller As Alternative For TCP/UDP Software Stack conference November 2018

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY