Diffraction of coherent radio waves transmitted by the Cassini spacecraft at 0.94‐ and 3.6‐cm wavelengths indicates the presence of fine‐scale structure in Saturn's rings A and B, characterized by a periodic radial variation in optical depth. Interpretation of the observed spectral signature in terms of a simple diffraction grating model yields estimates of the structural period λgr ≈ 100–250 meters and orientation ϕgr ≈ 0. In particular, two regions in Ring A of radial extent 123.05–123.4 × 103 km and 123.6–124.6 × 103 km yield average estimates of gr = 163 ± 6 meters and gr = 217 ± 8 meters, respectively. Three regions in Ring B of radial extent 92.1–92.6 × 103, 99.0–104.5 × 103 km, and 110.0–115.0 × 103 yield average estimates of gr = 115−15+20, 146 ± 14, and 250−75+150 meters, respectively. In all regions, the structure appears to be azimuthally symmetric with −3° ≤ ϕgr ≤ 3°.
This paper presents experimental and theoretical results for a number of high-temperature superconductive (HTS) planar thin film filters and resonators. The circuits were manufactured using TBCCO films. The measured maximum power handled by each assembled filter and resonator was correlated with the maximum normalized current density predicted by a commercially available software package. The results achieved were used to deduce the critical current density in each HTS device. The data demonstrates that it is possible to predict the power-handling capability of new filter designs by analyzing the results of the current density simulation. Manufacturing and testing resources can thus be limited to those HTS circuit designs which show the greatest potential for high-power handling.
[1] The Radon Transform plays a central role in the image reconstruction technique known as computed tomography, used commonly in radio astronomy and medical imaging. Although usually formulated as a projection of a spatial density function along straight ray paths, the Radon Transform kernel also permits curved path projections, providing the path can be defined. Reformulation of the Radon Transform as a path integral for the case of a radio ray refracting in a spherically symmetric atmosphere leads directly to the Abel Transform formulation commonly used in atmospheric radio occultation.
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