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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone

Electromagnetic Particle Injector (EPI) as a Fast Time Response Disruption Mitigation Concept

23 Oct 2018, 08:30
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster FIP - Fusion Engineering, Integration and Power Plant Design P1 Posters


Dr Jonathan Menard (Princeton Plasma Physics Laboratory)


The Electromagnetic Particle Injector (EPI) has the potential for delivering the radiative payload to the plasma center on a 3-4 ms time scale, much faster, and deeper, than what can be achieved using present methods. Predicting and controlling disruptions is an important and urgent issue for ITER. While a primary focus is the early prediction and avoidance of conditions favorable to a disruption, it is understood that some disruptions may be inescapable. For these cases, a fast time response method is essential to protect the ITER facility. Experimental tests on a proto-type system have been able to verify the predicted rapid response capability of the EPI system by accelerating a 3.2 g sabot to 150 m/s in 1.5 ms.

The primary advantage of the EPI concept over present systems is its ability to meet short warning time scales while accurately delivering a radiative payload composed of acceptable low-Z materials such as Be, B or BN. This is done at velocities of ≥ 1 km/s required to achieve core penetration in high power ITER discharges, thus providing thermal and runaway current mitigation. This capability will provide the means for initiating a controlled plasma termination that originates at the plasma center, rather than from the outer periphery. This added capability, in addition to the fast time-response capability, should provide greater flexibility in controlling tokamak disruptions.

*This work is supported by U.S. DOE Contracts: DE-AC02-09CH11466, DE-FG02-99ER54519 AM08, and DE-SC0006757.

Country or International Organization United States of America
Paper Number FIP/P1-51

Primary author

Dr Roger Raman (University of Washington)


Dr Jai Sachdev (Princeton Plasma Physics Laboratory) Dr Jonathan Menard (Princeton Plasma Physics Laboratory) Dr Masayuki Ono (PPPL/Princeton University) Dr Raffi Nazikian (Princeton Plasma Physics Laboratory) Dr Robert Lunsford (Princeton Plasma Physics Laboratory) Mr Thomas Jarboe (University of Washington) Mr Wei-Siang Lay (University of Washington)

Presentation Materials