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DTRA’s advancements in nuclear and radiological detection
A new, more complex nuclear age has begun. Echoing the tensions of the Cold War amid rapidly evolving nuclear and radiological threats, preparedness in the modern age is a contest of scientific innovation. The Research and Development Directorate (RD) at the Defense Threat Reduction Agency (DTRA) is charged with winning this contest.
Tomonori Takizuka, JT-60 Team
Fusion Science and Technology | Volume 34 | Number 3 | November 1998 | Pages 301-307
Fusion Topical Opening Session | doi.org/10.13182/FST98-A11963632
Articles are hosted by Taylor and Francis Online.
Recent experimental results of power and particle control in JT-60U with W-shaped pumped divertor are presented. Backflow of carbon impurities towards x point is decreased by the dome as well as by the gas puff from the main plasma. Heat load on divertor plates is reduced by the detached plasma at high density and radiative plasma by neon seeding. Effective helium exhaust is demonstrated for helium-beam-injected plasmas. Results of high-confinement experiments are also shown. Strongly heated ELMy H-mode plasmas are sustained during 9 s without increasing the impurity contamination. High QDTeq ~ 1 is obtained in the low Ip regime of the reversed shear plasmas. Progress in the negative-ion-based neutral beam injection experiments is finally introduced