Extensive work has been done to characterize and improve the smoothness of ablator materials used in inertial confinement fusion, however, features indicative of instabilities seeded from heterogeneity in these materials are still observed. A two-dimensional imaging velocimetry technique has been used on Omega (OHRV 2D-VISAR system) to measure the nonuniformity in the velocity of shock fronts...
The Cherenkov mechanism used in Gas Cherenkov Detectors (GCD) is exceptionally fast. However, the temporal resolution of GCDs, such as the Gamma Reaction History diagnostics (GRH) at NIF, has been limited by the current state-of-the-art photomultiplier tube (PMT) technology to ~100ps. The recently deployed Pulse Dilation Photomultiplier Tube (PD-PMT) at NIF allows for temporal resolution...
Coherence Imaging Spectroscopy (CIS) has emerged as a powerful tool for investigating 2D and 3D ion phenomena in the boundary of magnetically confined fusion plasmas. With this technique, a polarization interferometer can be used to image the velocity of any ion species emitting in the visible spectrum. Two separate tangentially-viewing CIS systems are employed on DIII-D: a wide field of view...
The electron cyclotron emission (ECE) diagnostic on ITER will provide Te(r,t) for pressure profiles, energy content, runaways, mode identification and plasma control. With its high electron temperatures and nuclear environment, ITER represents new challenges for each component of the diagnostic system. The frontend includes two Gaussian optics antennas and specially designed 1000 K calibration...
