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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 325 records · Page 18
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Measurement of the background in the CMS muon detector in ${p}{p}$-collisions at $\sqrt{s} = 13$ TeV

The CMS detector, including its muon system, has been operating at the CERN LHC in increasingly challenging conditions for about 15 years. The muon detector was designed to provide excellent triggering and track reconstruction for muons produced in proton–proton collisons at an instantaneous luminosity ($\mathcal{L}$) of 1 x 10 34 cm –2 s –1 . During the Run 2 data-taking period (2015–2018), the LHC achieved an instantaneous luminosity of twice its design value, resulting in larger background rates and making the efficient detection of muons more difficult. While some backgrounds result from natural radioactivity, cosmic rays, and interactions of the circulating protons with residual gas in the beam pipe, the dominant source of background hits in the muon system arises from proton–proton interactions themselves. Charged hadrons leaving the calorimeters produce energy deposits in the muon chambers. In addition, high-energy particles interacting in the hadron calorimeter and forward shielding elements generate thermal neutrons, which leak out of the calorimeter and shielding structures, filling the CMS cavern. We describe the method used to measure the background rates in the various muon subsystems. These rates, in conjunction with simulations, can be used to estimate the expected backgrounds in the High-Luminosity LHC. This machine will run for at least 10 years starting in 2029 reaching an instantaneous luminosity of $\mathcal{L}$ = 5 x 10 34 cm –2 s –1 and increasing ultimately to $\mathcal{L}$ = 7.5 x 10 34 cm –2 s –1 . These background estimates have been a key ingredient for the planning and design of the muon detector upgrade.

Tytgat, M. (ORCID:0000000239902074)↗
DOE OSTI2026

Metabolomics analysis of P. tremula × P. alba ‘717-1B4’ tissue culture hybrids grown in liquid media supplemented with EGGC and d4-EGGC

A metabolite linked to ethylene metabolism in Populus was recently structurally characterized as 2-hydroxyethyl β-D-glucopyranoside, an ethylene glycol glucose conjugate (EGGC). The dataset presented here is associated with the metabolomics analysis of various tissues (i.e., roots, stems/leaves) of plants grown in liquid media supplemented with EGGC and stable-isotope labelled EGGC (i.e., d4-EGGC). Data were collected using a Thermo Scientific gas chromatograph (GC) coupled to a Q Exactive Orbitrap mass spectrometer (MS). Samples were collected at three different timepoints and silylated prior to GCMS analysis.

09 BIOMASS FUELS↗
NASA NTRS2002

Synthesis and thermoeletric properties of Co(sub (1-x)ni)(sub X)P(sub 3) and CoAs((sub 3-x))P(sub x) skutterudites

Two types of promising phosphide skutterudite materials, Co(1-x)NixP3 (x= 0.025 to 0.70) and CoAs(3-x)Px (x=0.5 to 0.10), have been synthesized and their transport properties measured. These compounds were prepared using a direct synthesis technique. The samples were hot pressed and analyzed by electron microprobe microscopy. Hall Effect measurements were conducted to determine the electrical conductivity, mobility and carrier concentration. In addition, Seebeck voltage and thermal conductivity measurements were performed. The thermoelectric properties are presented anddiscussed as a function of temperature up to 1273 K. The thermal stability of the primary CoP3 was examined in a static vacuum under isothermal and in-gradient conditions. The effect of the presence of 1 atm of a cover gas on the material loss rate was analyzed.

thermoelectric↗
DOE OSTI2020

Materials Data on P by Materials Project

P is Hittorf-like structured and crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of one P ribbon oriented in the (1, 1, 0) direction. there are twenty-one inequivalent P sites. In the first P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are a spread of P–P bond distances ranging from 2.20–2.22 Å. In the second P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.22 Å) and one longer (2.28 Å) P–P bond lengths. In the third P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.20 Å) and one longer (2.21 Å) P–P bond lengths. In the fourth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.20 Å) and one longer (2.29 Å) P–P bond lengths. In the fifth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.21 Å) and one longer (2.24 Å) P–P bond lengths. In the sixth P site, P is bonded in a distorted trigonal non-coplanar geometry to three P atoms. There are one shorter (2.21 Å) and one longer (2.31 Å) P–P bond lengths. In the seventh P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.21 Å) and one longer (2.25 Å) P–P bond lengths. In the eighth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.29 Å. In the ninth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.20 Å) and two longer (2.22 Å) P–P bond lengths. In the tenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.22 Å. In the eleventh P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.21 Å) and one longer (2.22 Å) P–P bond lengths. In the twelfth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.21 Å. In the thirteenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.22 Å) and one longer (2.24 Å) P–P bond lengths. In the fourteenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.22 Å. In the fifteenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. There are one shorter (2.20 Å) and one longer (2.24 Å) P–P bond lengths. In the sixteenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. In the seventeenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.24 Å. In the eighteenth P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.24 Å. In the nineteenth P site, P is bonded in a distorted trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.30 Å. In the twentieth P site, P is bonded in a distorted trigonal non-coplanar geometry to three P atoms. In the twenty-first P site, P is bonded in a trigonal non-coplanar geometry to three P atoms. The P–P bond length is 2.26 Å.

36 MATERIALS SCIENCE↗