A high resolution, Diagnostic-Instrument-Manipulator-based x-ray Bragg crystal spectrometer has been calibrated for and deployed at the National Ignition Facility (NIF) to diagnose plasma conditions and mix in ignition capsules near stagnation times. The spectrometer has two conical crystals in the Hall geometry focusing rays from the Kr He-α and He-β complexes onto a streak camera, with the...
Estimating the volume of a highly distorted ICF core is critical to evaluating the performance of an ICF implosion: degree of alpha heating is inferred from hot spot pressure, which is in turn derived from hot spot volume, as observed from x-ray self-emission images. Accurate tomographic reconstruction to determine volume is precluded by the limited number of accessible lines of sight...
X-ray imaging spectrometers are used on many fusion experiments for the measurement of basic plasma parameters, such as ion and electron temperatures Ti and Te, impurity densities nZ, plasma flow velocities v and recently also for the determination of the radial electric field Er .This paper shows initial measurements of the recently upgraded X-ray imaging spectrometer systems XICS and HR-XIS...
A new generation fast-gated x-ray framing cameras has been developed that is capable of capturing multiple frames along a single line-of-sight with 25 ps temporal resolution and 40 μm spatial resolution. This was achieved by integrating an electron pulse-dilation imager [1] with Sandia’s nanosecond-gated burst mode CMOS sensors [2]. The combination of these two transformative technologies...
