An x-ray penumbral imager for measurements of electron–temperature profiles in inertial confinement fusion implosions at OMEGA
P. J. Adrian, J. A. Frenje, Brandon Adrian Aguirre, B. Bachmann, A. Birkel, M. Gatu Johnson, N. V. Kabadi, B. Lahmann, C K Li, Owen Mannion, William Joseph Martin, Z. L. Mohamed, S. P. Regan, H. G. Rinderknecht, Brett Scheiner, Mark Schmitt, F. H. Séguin, Rahul Shah, H. Sio, C. Sorce, G. D. Sutcliffe, R. D. Petrasso
Abstract
Hot-spot shape and electron temperature (Te) are key performance metrics used to assess the efficiency of converting shell kinetic energy into hot-spot thermal energy in inertial confinement fusion implosions. X-ray penumbral imaging offers a means to diagnose hot-spot shape and Te, where the latter can be used as a surrogate measure of the ion temperature (Ti) in sufficiently equilibrated hot spots. We have implemented a new x-ray penumbral imager on OMEGA. We demonstrate minimal line-of-sight variations in the inferred Te for a set of implosions. Furthermore, we demonstrate spatially resolved Te measurements with an average uncertainty of 10% with 6 μm spatial resolution.