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Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
E.A. Chaniotakis, J.P. Freidberg, D.R. Cohn
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1168-1176
Ignition Device | doi.org/10.13182/FST91-A29501
Articles are hosted by Taylor and Francis Online.
In this paper we write the 0-D energy balance in terms of the parameters , and . The minimum value of W required to achieve ohmic ignition (i.e. II = 0) in the generic case (i.e. no n or T dependance on τ), and for various dependencies of τ on n and T is W ∼ 15 in all cases. Also the value of W below which no access, even with the aid of auxiliary power, to high temperature alpha dominated operation is possible is W ∼ 2 in all cases. Optimized designs are obtained by minimizing the ratio of the auxiliary power pa to the ohmic power pΩ at the Cordey pass. The optimization is consistent with the physics requirements, the toroidal field coil volume and stress constraints, and with the volt-second and stress constraints of the ohmic transformer. Results under various τ dependencies are presented.