A “Universal Time” system for ASDEX upgrade

Raupp, G.; Cole, R.; Behler, K.; Fitzek, M.; Heimann, P.; Lohs, A.; Lüddecke, K.; Neu, G.; Schacht, J.; Treutterer, W.; Zasche, D.; Zehetbauer, T.; Zilker, M.

doi:10.1016/s0920-3796(03)00381-8

Cited by 17 publications

(10 citation statements)

References 2 publications

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“…For RT DAQ, on the other hand, the requirement is not to 4 The present development emerged from the first HOTLink serial I/O-cards developed in 1999 [10] for the Mirnov and Soft-Xray diagnostics in combination with the ideas developed for the Universal Time-to-Digital Converter (UTDC) [11]. The UTDC was built for the renewal of the ASDEX Upgrade control system and to satisfy the need for a new central experiment timing system.…”

Section: Hardware Platform and Osmentioning

confidence: 99%

Real-time diagnostics at ASDEX Upgrade—Architecture and operation

Behler¹,

Blank²,

Eixenberger³

et al. 2008

Fusion Engineering and Design

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Diagnostics at ASDEX Upgrade have available a very large number of highly developed measuring channels. The prospect of making this wealth of information usable for plasma optimization led to the implementation of a number of diagnostics running data acquisition in real-time (RT). Ultimately, this development aims to achieve a network of intelligent diagnostics delivering analysed data for high-level plasma performance control such as profile shaping and NTM stabilization.The new RT diagnostics consist of standard industrial 19" servers organized in clusters and running a standard UNIX multiprocessor RT-capable operating system (RT OS). Built-to-purpose computer interface cards deliver data (e.g. via serial links) from the data acquisition (DAQ) front-ends directly into the main memory of the DAQ servers. An RT data analysis task immediately following the running direct memory access (DMA) data transfers processes the data and delivers the results to follow-up systems in the control chain.Whereas the first systems were implemented in a simple JBOC (just a bunch of computers) configuration being operated as a number of single diagnostics, newer systems are integrated into diagnostic clusters using parallel computing techniques such as message passing interface (MPI).The paper describes the hardware (ADC front-ends, serial I/O, selection criteria and performance of the involved computer busses and systems) and software (DAQ, DA, RT OS, MPI) architecture of the assembled systems. Benchmark results for DAQ and MPI bandwidth and latencies as well as for the behaviour of the RT OS will be given.

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Section: Hardware Platform and Osmentioning

confidence: 99%

Real-time diagnostics at ASDEX Upgrade—Architecture and operation

Behler¹,

Blank²,

Eixenberger³

et al. 2008

Fusion Engineering and Design

Self Cite

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“…The system integrates a universal time-to-digital converter 4 resolution, a maximum sampling rate of 200 MSamples/s, and a total of 512 MB memory per channel. 5 Each reflectometer channel uses two (I and Q) acquisition channels.…”

Section: Reflectometry Diagnosticmentioning

confidence: 99%

Implementation of the new multichannel X-mode edge density profile reflectometer for the ICRF antenna on ASDEX Upgrade

Aguiam

Silva

Bobkov

et al. 2016

Review of Scientific Instruments

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A new multichannel frequency modulated continuous-wave reflectometry diagnostic has been successfully installed and commissioned on ASDEX Upgrade to measure the plasma edge electron density profile evolution in front of the Ion Cyclotron Range of Frequencies (ICRF) antenna. The design of the new three-strap ICRF antenna integrates ten pairs (sending and receiving) of microwave reflectometry antennas. The multichannel reflectometer can use three of these to measure the edge electron density profiles up to 2 x 10(19) m(-3), at different poloidal locations, allowing the direct study of the local plasma layers in front of the ICRF antenna. ICRF power coupling, operational effects, and poloidal variations of the plasma density profile can be consistently studied for the first time. In this work the diagnostic hardware architecture is described and the obtained density profile measurements were used to track outer radial plasma position and plasma shape

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“…Instead of memories they have 16-bit parallel shift registers to hold and transport the samples from the inputs along the chain. This chain of shift registers is driven by a clock directly derived from the HOTLink II clock on the SIO card which in turn is synchronized with the central experiment clock via the embedded TDC (time to digital converter, described elsewhere: [2], [3]). …”

Section: How Sio and Pipeline Address The Requirementsmentioning

confidence: 99%

“…The behaviour of the front-end modules, the pipeline, and the FPGA logic in the SIO interface is completely deterministic. On the computer side, a soft real-time OS 2 conforming to POSIX 1003.1b real-time extension standards is required to provide an appropriate environment for the DAQ supervision process as well as for the RT data analysis and RT communication with Control. While this development was initially motivated by the need to replace existing serial input modules, it soon turned out that together with the front-end pipeline it could serve as a new general DAQ concept for ASDEX Upgrade covering real-time needs as well as refurbishment requirements of old CAMAC diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Real-time standard diagnostic for ASDEX Upgrade

Behler

Blank

Buhler

et al. 2010

Fusion Engineering and Design

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Development of a real-time (RT) data acquisition (DAQ) system for ASDEX Upgrade was started years ago. Based on a modular front-end configuration with serial input/output computer interface a small number of powerful new diagnostics were commissioned. In the course of these developments we concluded that "direct to memory" DAQ concepts hold promise for future DAQ tasks including those with a subsequent RT data processing step. A survey of the requirements of existing and future diagnostics at ASDEX Upgrade was conducted to assess the wider applicability of these DAQ techniques to the upcoming needs for new diagnostics or the refurbishment of old ones. The paper presents the results of the requirements survey and indicates in which cases the developed diagnostic concept can be applied. A series of new diagnostics implemented using these techniques is presented in detail. This covers developed front-end modules as well as whole diagnostic configurations in hardware and software. The achieved DAQ data rates, data transport latencies, and fine-tuning steps to maintain a reliable RT operation are described explicitly. An outlook is given upon the definition of a RT diagnostic standard for ASDEX Upgrade based on the developments described previously.

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A “Universal Time” system for ASDEX upgrade

Cited by 17 publications

References 2 publications

Real-time diagnostics at ASDEX Upgrade—Architecture and operation

Real-time diagnostics at ASDEX Upgrade—Architecture and operation

Implementation of the new multichannel X-mode edge density profile reflectometer for the ICRF antenna on ASDEX Upgrade

Real-time standard diagnostic for ASDEX Upgrade

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