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Fusion Science and Technology
Latest News
College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
P. A. Rayjada, N. P. Vaghela, N. L. Chauhan, A. Sircar, E. Rajendrakumar, L. M. Manocha, P. M. Raole
Fusion Science and Technology | Volume 65 | Number 2 | March-April 2014 | Pages 194-198
Technical Paper | doi.org/10.13182/FST13-649
Articles are hosted by Taylor and Francis Online.
India has proposed to develop and test the Lead-Lithium–cooled Ceramic Breeder Test Blanket Module (In-LLCB-TBM) in ITER. This concept, unlike some others, may need a high-performance ceramic coating on the inner wall to meet dual requirements such as high insulation to mitigate magnetohydrodynamic effects and a tritium permeation barrier to avoid tritium in the structural material. We deposit Er2O3 coatings using a direct-current magnetron reactive sputter deposition technique. As part of optimizing the coating from the application point of view, we carried out a series of deposition experiments. These included investigating the effects of substrate temperature in the range 165°C to 360°C, the effects of postannealing, and the effects of oxygen-to-argon gas flow ratio, keeping all other process parameters constant. Primarily, a densely packed film is required to grow in the most stable cubic crystal structure, with very high resistivity, in the range of gigaohm-centimeters to teraohm-centimeters. The results indicate that erbia films of thicknesses in the range 270 to 1000 nm are formed in amorphous, monoclinic, and cubic phases, where the cubic phase content is enhanced in a narrow window of the flow ratio at 360°C. Both crystalline phases seem to grow in a preferred crystalline direction. Post-vacuum-annealing at 500°C for 2 h largely transforms the monoclinic phase into the cubic phase.