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Task 8 Magnet Safety

2015-5-7 11:12| View Publisher: root| View: 2976| Comments: 0

1 Scope

The purpose of this task is to coordinate the development of magnet arcing safety codes, and to benchmark these codes against experimental data (both internal magnet arcs and external magnet busbar arcs). The safety concern is that the enormous stored energy in the magnetic field of a fusion device can be resistively dissipated in the magnet, or its busbars, which can produce magnet melt, molten material jets, and current arcs threatening the integrity of radiological confinement barriers, such as the vacuum vessel (VV), cryostat and busbar guard tubes.

2 Progress ( 2014 )

INL MACARC code for arcs in magnets was sent to the CCFE laboratory by way of the ITER project.

CCFE is developing a new magnet safety code on top of the ANSYS code framework, under an ITER IO contract. Benchmarking with this new magnet safety code and MAGARC is on-going.

Arc experiments have concluded at KIT, with no new experiments planned. The basic finding is that while the inner ITER TF busbar feeder tubes, busbar separating wall are expected to be destroyed in busbar arcing accident, the outer feeder tubes will hardly be damaged at all.

In Japan, two experiments on joint resistance for ITER Toroidal Field coils were performed at NIFS. Regarding safety, the results were very successful, results should be released once ITER approval is given.

3 Future Plane ( 2015 )

(US) A Task 8 meeting will be conducted at the International Symposium on Fusion Nuclear Technology (ISFNT-2015), to be held in Korea in September of 2015, if enough participants are available.  The INL will continue with the magnet safety code benchmarking activity with CCFE to the extent that funding allows.

(EU) The KIT-INR experimental and numeric modeling magnet safety activities will end at the end of 2014.

(JA) Experiments for CS module of JT-SA in NIFS will begin next year.

4 Experts

8 C Magnet Safety






Yuntao SONG


Volker Pasler


Hirotaka Chikaraishi


Keeman KIM


Igor Rodin


Brad Merrill


Disclaimer:The ESEFPIA also known as the implementing Agreement on a Co-operative Programme on Environmental,Safety and Economic Aspects of Fusion Power,functions within a framework created by the International Energy Agency(IEA).Views,findings and publications of the ESEFPIA do not necessarily represent the views or policies of the IEA Secretariat or of all of its individual member countries.

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