There is much interest in developing new scintillator detectors for radiation detection and radiographic imaging
applications. The knowledge of the electron mobility (μ) is important in the basic understanding of charge transport and
in the selection and optimization of many inorganic scintillator materials such as thallium-doped cesium iodide, CsI(Tl).
Performance measures are used to model various scintillator responses in an effort to predict the effect of doping
concentrations. Performance models will help in the new scintillator design process. Initial tests are done with cadmium
zinc telluride detectors to establish measurement techniques and baselines.
A diagnostic instrument has been developed for the acquisition of high-speed time-resolved images at the Dual-Axis
Radiographic Hydrodynamic Test (DARHT) Facility at Los Alamos National Laboratory. The instrument was developed
in order to create time histories of the electron beam. Four discrete optical subsystems view Cerenkov light generated at
an x-ray target inside of a vacuum envelope. Each system employs cylindrical optics to image light in one direction and
collapse light in the orthogonal direction. Each of the four systems images and collapses in unique axes, thereby capturing
unique information. Light along the imaging axis is relayed via optical fiber to streak cameras. A computer is used
to reconstruct the original image from the four optically collapsed images. Due to DARHT's adverse environment, the
instrument can be operated remotely to adjust optical parameters and contains a subsystem for remote calibration. The
instrument was deployed and calibrated, and has been used to capture and reconstruct images. Matters of alignment,
calibration, control, resolution, and adverse conditions will be discussed.
An instrument has been developed to acquire time-resolved tomographic data from the electron beam at the DARHT [Dual-Axis Radiographic Hydrodynamic Test] facility at Los Alamos National Laboratory. The instrument contains four optical lines of sight that view a single tilted object. The lens design optically integrates along one optical axis for each line of sight. These images are relayed via fiber optic arrays to streak cameras, and the recorded streaks are used to reconstruct the original two-dimensional data. Installation of this instrument into the facility requires automation of both the optomechanical adjustments and calibration of the instrument in a constrained space. Additional design considerations include compound tilts on the object and image planes.
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