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  Discovering, Making, and Testing New Materials: SRNL’s Center For Hierarchical Waste Form Materials
  Savannah River National Laboratory researchers are building on the laboratory’s legacy of using cutting-edge science to effectively immobilize nuclear waste in innovative ways. As part of the Center for Hierarchical Waste Form Materials, SRNL is leveraging its depth of experience in radiological waste management to explore new frontiers in the industry.
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A new high-power electron cyclotron heating system has been installed for the Heliotron-E helical device. This system is designed to operate at 106-GHz frequency with a half-megawatt output power. The system consists of a pulse gyrotron with TE_12,2 whispering gallery mode (WGM) output, conversion system of the WGM into the Gaussianlike beam, transmission line for HE₁₁ mode, and launching system. From measurement of radiation patterns, it was confirmed that the WGM was effectively converted into the Gaussianlike beam, and the emergent radiation profile from the tubular oversized corrugated waveguide was close to a circular Gaussian one even when the beam coupled to the HE₁₁ mode had the side lobes before the transmission. This indicates that the oversized corrugated waveguides act as a mode filter. The launching system effectively focuses the Gaussian beam in the free space to a 2-cm (poloidal) × 3-cm (toroidal) e-folding power spot size. These are small enough compared with the plasma minor radius (∼15 cm). It is expected that the power deposition can be well localized in the plasma central region.