| Paper |
Title |
Page |
| TPPA21 |
MDSplus Real-Time Data Access in RTAI
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132 |
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- A. Barbalace, A. Luchetta, C. Taliercio, G. Manduchi
Consorzio RFX, Euratom ENEA Association, Padova
- T. W. Fredian
MIT, Cambridge, Massachusetts
- J. A. Stillerman
MIT/PSFC, Cambridge, Massachusetts
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The MDSplus package is widely used in Nuclear Fusion research for data acquisition and management. Recent extensions of the system provide useful features for real-time applications, such as the possibility of locking selected data items in memory and real-time notification. The real-time extensions of MDSplus have been implemented as a set of C++ classes and can be easily ported to any target architecture by developing a few adapter classes. The real-time data access layer of MDSplus is currently available for Windows, Linux, VxWorks and RTAI. In particular, the RTAI platform is very promising in this context because it allows the co-existence of offline, non-real-time tasks with real-time ones. It is hence possible to devise an architecture where real-time functionality is handled by a few selected tasks using the real-time data access layer of MDSplus, whereas background, non-real-time activity is carried out by “traditional” Linux tasks. This organization may be of interest for the next generation of fusion devices with long-duration discharges, during which the system has to provide feedback control in real time and to sustain continuous data acquisition and storage.
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| WPPB28 |
Remote Operation of Large-Scale Fusion Experiments
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454 |
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- G. Abla, D. P. Schissel
GA, San Diego, California
- T. W. Fredian
MIT, Cambridge, Massachusetts
- M. Greenwald, J. A. Stillerman
MIT/PSFC, Cambridge, Massachusetts
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This paper examines the past, present, and future remote operation of large-scale fusion experiments by large, geographically dispersed teams. The fusion community has considerable experience placing remote collaboration tools in the hands of real users. Tools to remotely view operations and control selected instrumentation and analysis tasks were in use as early as 1992 and full remote operation of an entire tokamak experiment was demonstrated in 1996. Today’s experiments invariable involve a mix of local and remote researchers, with sessions routinely led from remote institutions. Currently, the National Fusion Collaboratory Project has created a FusionGrid for secure remote computations and has placed collaborative tools into operating control rooms. Looking toward the future, ITER will be the next major step in the international program. Fusion experiments put a premium on near real-time interactions with data and among members of the team and though ITER will generate more data than current experiments, the greatest challenge will be the provisioning of systems for analyzing, visualizing and assimilating data to support distributed decision making during ITER operation.
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