A Multi-Channel X-Ray Temporal Diagnostic For Measurement Of Time-Resolved Electron Temperature In Cryogenic Deuterium-Tritium Implosions At Omega

Electron-temperature (T-e) measurements in implosions provide valuable diagnostic information, as T-e is unaffected by residual flows and other non-thermal effects unlike ion temperature inferred from a fusion product spectrum. In OMEGA cryogenic implosions, measurement of T-e(t) can be used to investigate effects related to time-resolved hot-spot energy balance. The proposed diagnostic utilizes five fast-rise (similar to 15 ps) scintillator channels with distinct x-ray filtering. Titanium and stepped aluminum filtering were chosen to maximize detector sensitivity in the 10 keV-20 keV range, as it has been shown that these x rays have similar density and temperature weighting to the emitted deuterium-tritium fusion neutrons. Initial data collected using a prototype nosecone on the existing neutron temporal diagnostic demonstrate the validity of this diagnostic technique. The proposed system will be capable of measuring spatially integrated T-e(t) with 20 ps time resolution and <10% uncertainty at peak emission in cryogenic DT implosions.