Status of the ITER remote experimentation centre

Farthing, J.; Ozeki, T.; Lorenzo, Susana Clement; Nakajima, N.; Sartori, F.; Tommasi, G. De; Manduchi, G.; Barbato, P.; Rigoni, A.; Vitale, V.; Giruzzi, G.; Mattei, M.; Mele, A.; Imbeaux, F.; Artaud, Jean-François; Robin, F.; Noe, John P.; Joffrin, E.; Hynes, A.; Hemming, O.; Wheatley, M.; O’hira, Shigeru; Ide, S.; Ishii, Yasutomo; Matsukawa, M.; Kubo, H.; Totsuka, T.; Urano, H.; Naito, O.; Hayashi, Nobuhiko; Miyata, Yasumitsu; Namekawa, Masakazu; Wakasa, A.; Oshima, Takayuki; Nakanishi, Hiroyuki; Yamanaka, Kenjiro

doi:10.1016/j.fusengdes.2018.02.004

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Under the Broader Approach (BA) activities, the ITER Remote Experimentation Centre (REC) has been preparing to make a full replication of ITER data at Rokkasho, Japan [13]. ITER data system and its access methods are named as ITERDB and the Unified Data Access (UDA), respectively [14,15,16].…”

Section: Iter Uda and Replicated Repositorymentioning

confidence: 99%

Design for the distributed data locator service for multi-site data repositories

Nakanishi

Yamanaka

Tokunaga

et al. 2021

Fusion Engineering and Design

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Section: Iter Uda and Replicated Repositorymentioning

confidence: 99%

Design for the distributed data locator service for multi-site data repositories

Nakanishi

Yamanaka

Tokunaga

et al. 2021

Fusion Engineering and Design

Self Cite

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“…Indeed, it permits also to automate both the validation and deployment of the plasma axisymmetric magnetic control (relevant examples on existing tokamak devices can be found in [7,24,28,32,40,52]. Furthermore, reliable linear plasma models are also used to support the design and commissioning of the magnetic diagnostic [69], as well as to run inter-shot simulations aimed at optimising the controller parameters [38].…”

Section: The Input Voltages Vector;mentioning

confidence: 99%

Plasma Magnetic Control in Tokamak Devices

Tommasi

2018

J Fusion Energ

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In tokamak experimental reactors, the magnetic control system is one of the main plasma control systems that is required, together with the density control, since the very beginning, even before first operations. Indeed, the magnetic control drives the current in the external poloidal circuits in order to first achieve the breakdown conditions and, after plasma formation, to track the desired plasma current, shape and position. Furthermore, when the plasma poloidal cross-section is vertically elongated, the magnetic control takes also care of the vertical stabilization of the plasma column, and therefore it is an essential system for operation. This chapter introduces a reference architecture for plasma magnetic control in tokamaks. Given the proposed architecture, the techniques to design all the required control algorithms is also presented. Experimental results obtained on the JET and EAST tokamaks and simulations for machines currently under construction are shown to prove the effectiveness of the proposed architecture and control algorithms.

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“…REC room has already been built for the remote participation to the ITER experiment. A large video wall is planned to show the live status of the ITER facility together with the plasma experiment [1]. REC will also have a large storage system in order to replicate the ITER full data which may be used for Japanese domestic researchers to perform off-site data analyses with the minimized access latency.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of High-Speed Data Replication Relay Across Multiple Repository Sites Using a Global Loop Path

Nakanishi

Yamanaka

Tokunaga

et al. 2021

Plasma and Fusion Research

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Technical verification has been progressing for high efficiency data replication between ITER and the Remote Experimentation Centre (REC) in Japan. Transferring a huge amount of data simultaneously to multiple destinations might cause excessive loads and network bandwidth on the sender so that daisy-chained relay transfer would be a considerable solution. This study demonstrates how efficiently the replication relay could be realized for the next-generation fusion experiments, such as ITER and JT-60SA. All the LHD data were consecutively sent to the REC through the global loop path (GLP: Toki -Gifu -Tokyo -Amsterdam -New York -Los Angeles -Tokyo -Aomori -Rokkasho) on SINET5 L2VPN, whose round-trip time is almost 400 ms. MMCFTP was used for the data transferring application. In both the Japan domestic path and the GLP cases, every transfer shows a very stable flattop speed as the preset 8 Gbps. However, longer gap times were needed in MMCFTP initial negotiation to establish numerous sessions. The performance optimized NVMe and iSCSI striped storages have shown higher throughputs than the ITER estimated initial data rate of 2 GB/s. Those knowledge enable the design optimization of not only the sender/receiver servers with their storages but also the intermediate relay server system.

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Status of the ITER remote experimentation centre

Cited by 6 publications

References 13 publications

Design for the distributed data locator service for multi-site data repositories

Design for the distributed data locator service for multi-site data repositories

Plasma Magnetic Control in Tokamak Devices

Demonstration of High-Speed Data Replication Relay Across Multiple Repository Sites Using a Global Loop Path

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