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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.
K.-S. Chung et al. (18R05)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 69-71
Technical Paper | Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST07-A1316
Articles are hosted by Taylor and Francis Online.
Radial profiles of plasma density and electron temperature have been measured by a fast-scanning probe (FSP) system with various neutral pressures in the MAP-II and DiPS linear devices for the divertor simulation. The probe system is made of three probe tips, two of which is for a Mach probe consisting of two opposite-directional probes, and one is for an emissive probe installed on the pneumatically driven fast-scanning system with stroke of 30 cm. In MAP-II, density at the center has been varied from 1.5 × 1013 cm-3 to 0.7 × 1013 cm-3 with pressures of 5.5 to 112 mtorr, while that of DiPS varied from 3.5 × 1012 cm-3 to 9 × 1012 cm-3 with pressures of 0.8 to 50 mtorr. Relation of density profile with the working pressure/magnetic field is analyzed by using a simple fluid model. Electron temperature at the center is also measured by the Thomson scattering method and compared with those of FSP, which is varied from 0.6 to 6.5 eV