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All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Time Resolution Characterization of 4H-SiC LGADs with a 90 Sr Source

This work presents timing measurements of 4H-SiC Low Gain Avalanche Detectors (4H-SiC LGADs) using beta particles from a 90Sr source. The 4H-SiC LGADs exhibit fast signal responses, and a time resolution of 61 ps was achieved, comparable to that of standard Si LGADs. The present limitation in the time resolution of 4H-SiC LGADs appears to stem from limited charge generation. Nevertheless, their higher voltage tolerance and faster carrier drift suggest that, with increased charge collection, their timing performance could approach or even surpass that of Si LGADs. Furthermore, these results demonstrate the strong potential of 4H-SiC LGADs as a robust platform for precision timing in future 4D tracking detectors, while also highlighting that signal charge is the dominant factor currently limiting their performance, indicating that further optimization of gain and drift structures will be essential for future development.

43 PARTICLE ACCELERATORS↗
DOE OSTI2021

Diverse Super-Resolution (diversity_SR) [SWR-21-60]

Deep learning tools for enhancing the spatial resolution of wind data. The software is developed in Python using the TensorFlow deep learning package. Models for diversity super-resolution is provided. Included in the package are pretrained models with example code/data to perform the super-resolution as well as tools of training models for different enhancement- or data-types. The super-resolution is an inherently ill-conditioned problem, with multiple high-resolution fields plausibly mapping to the same coarse field. Considitional GANs provide a framework for generating a distribution of high-resolution realizations from a given low-resolution input. Stochastic estimation is used to inform the network of the expected degree and location of sub-grid diversity. The package includes a pretrained network to generate distributions of 10x-enhanced fields of wind data.

Glaws, Andrew↗
DOE OSTI2026

Solvari SR, Simplifying Residential Solar to 1 SKU, with Extended Testing

Accelerated weathering and material compatibility testing for polymeric and asphaltic materials. NLR will be testing the durability of the polymeric materials proposed for use in the supporting structures designed by TESCI solar. This will include the bare materials and coupons attached to asphalt shingles. The exposure will be in damp heat and separately heat, humidity and UV light, all followed by mechanical evaluation. Modification 1 is an extension of the first round of testing with both a continuation of some of the same testing and addition of new testing methods and materials. The testing of materials in the condition of A3 looking at mechanical durability will be continued looking at the materials used in the mounting brackets. We will be adding in testing of the silicone adhesive to the module and of the module itself. For the mounting brackets, testing will also be conducted at multiple temperatures and humidity levels to allow for extrapolation to the field.

14 SOLAR ENERGY↗
DOE OSTI2020

Materials Data on Sr20P12Cl(O16F)3 by Materials Project

Sr20P12Cl(O16F)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twenty inequivalent Sr sites. In the first Sr site, Sr is bonded in a 7-coordinate geometry to six O and one Cl atom. There are a spread of Sr–O bond distances ranging from 2.41–2.77 Å. The Sr–Cl bond length is 2.78 Å. In the second Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.51–2.86 Å. The Sr–F bond length is 2.44 Å. In the third Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.61–2.95 Å. In the fourth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.60–2.96 Å. In the fifth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.52–2.81 Å. The Sr–F bond length is 2.45 Å. In the sixth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.54–2.84 Å. The Sr–F bond length is 2.45 Å. In the seventh Sr site, Sr is bonded in a 7-coordinate geometry to six O and one Cl atom. There are a spread of Sr–O bond distances ranging from 2.44–2.80 Å. The Sr–Cl bond length is 2.78 Å. In the eighth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one Cl atom. There are a spread of Sr–O bond distances ranging from 2.44–2.76 Å. The Sr–Cl bond length is 2.79 Å. In the ninth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.59–3.05 Å. In the tenth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.60–2.96 Å. In the eleventh Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.58–3.03 Å. In the twelfth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.60–2.96 Å. In the thirteenth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.55–2.83 Å. The Sr–F bond length is 2.44 Å. In the fourteenth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.55–2.83 Å. The Sr–F bond length is 2.45 Å. In the fifteenth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.53–2.81 Å. The Sr–F bond length is 2.45 Å. In the sixteenth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.51–2.80 Å. The Sr–F bond length is 2.45 Å. In the seventeenth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.56–3.05 Å. In the eighteenth Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.59–3.02 Å. In the nineteenth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.52–2.81 Å. The Sr–F bond length is 2.45 Å. In the twentieth Sr site, Sr is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Sr–O bond distances ranging from 2.54–2.84 Å. The Sr–F bond length is 2.44 Å. There are twelve inequivalent P sites. In the first P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the second P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the third P site, P is bonded in a tetrahedral geometry to four O atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. In the fourth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the fifth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the sixth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the seventh P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the eighth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the ninth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the tenth P site, P is bonded in a tetrahedral geometry to four O atoms. All P–O bond lengths are 1.56 Å. In the eleventh P site, P is bonded in a tetrahedral geometry to four O atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. In the twelfth P site, P is bonded in a tetrahedral geometry to four O atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. There are forty-eight inequivalent O sites. In the first O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the second O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the third O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the fourth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the fifth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the sixth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the seventh O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the eighth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the ninth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the tenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the eleventh O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the twelfth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirteenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the fourteenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the fifteenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the sixteenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the seventeenth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the eighteenth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the nineteenth O site, O is bonded in a distorted tetrahedral geometry to three Sr and one P atom. In the twentieth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the twenty-first O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the twenty-second O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the twenty-third O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the twenty-fourth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the twenty-fifth O site, O is bonded in a 4-coordinate geometry to three Sr and one P atom. In the twenty-sixth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the twenty-seventh O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the twenty-eighth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the twenty-ninth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the thirtieth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-first O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the thirty-second O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-third O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-fourth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-fifth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the thirty-sixth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-seventh O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-eighth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the thirty-ninth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the fortieth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the forty-first O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the forty-second O site, O is bonded in a 4-coordinate geometry to three Sr and one P atom. In the forty-third O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the forty-fourth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. In the forty-fifth O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the forty-sixth O site, O is bonded in a distorted tetrahedral geometry to three Sr and one P atom. In the forty-seventh O site, O is bonded in a distorted single-bond geometry to three Sr and one P atom. In the forty-eighth O site, O is bonded in a 1-coordinate geometry to three Sr and one P atom. Cl is bonded in a trigonal non-coplanar geometry to three Sr atoms. There are three inequivalent F sites. In the first F site, F is bonded in a trigonal planar geometry to three Sr atoms. In the second F site, F is bonded in a trigonal planar geometry to three Sr atoms. In the third F site, F is bonded in a trigonal planar geometry to three Sr atoms.

36 MATERIALS SCIENCE↗