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All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Characterization of the ATLAS Liquid Argon Front-End ASIC ALFE2 for the HL-LHC upgrade

In this study, ALFE2 is an ATLAS Liquid Argon Calorimeter (LAr) Front-End ASIC designed for the HL-LHC upgrade. ALFE2 comprises four channels of pre-amplifiers and CR-(RC) 2 shapers with adjustable input impedance. ALFE2 features two separate gain outputs to provide 16-bit dynamic-range coverage and an optimum resolution. ALFE2 is characterized using a Front-End Test Board (FETB) based on a Zynq UltraScale+ MPSoC and two octal-channel 16-bit high-speed ADCs. The test results indicate that ALFE2 fulfills or greatly exceeds all specifications on gain, noise, linearity, uniformity, and radiation tolerance.

47 OTHER INSTRUMENTATION↗
DOE OSTI2020

Materials Data on AlFe2 by Materials Project

Fe2Al is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Fe is bonded to six equivalent Fe and six equivalent Al atoms to form a mixture of edge, corner, and face-sharing FeAl6Fe6 cuboctahedra. All Fe–Fe bond lengths are 2.37 Å. All Fe–Al bond lengths are 2.78 Å. Al is bonded in a 12-coordinate geometry to twelve equivalent Fe and four equivalent Al atoms. All Al–Al bond lengths are 2.90 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(AlFe2)4 by Materials Project

Y(Fe2Al)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to sixteen Fe and four equivalent Al atoms. There are eight shorter (3.16 Å) and eight longer (3.25 Å) Y–Fe bond lengths. All Y–Al bond lengths are 2.93 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to two equivalent Y, six Fe, and four equivalent Al atoms to form a mixture of distorted edge, face, and corner-sharing FeY2Al4Fe6 cuboctahedra. There are four shorter (2.46 Å) and two longer (2.47 Å) Fe–Fe bond lengths. All Fe–Al bond lengths are 2.59 Å. In the second Fe site, Fe is bonded in a 12-coordinate geometry to two equivalent Y, six Fe, and four equivalent Al atoms. Both Fe–Fe bond lengths are 2.80 Å. There are two shorter (2.62 Å) and two longer (2.65 Å) Fe–Al bond lengths. Al is bonded in a 10-coordinate geometry to one Y, eight Fe, and one Al atom. The Al–Al bond length is 2.63 Å.

36 MATERIALS SCIENCE↗