| 1. |
- Poley, L., et al.
(författare)
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The ABC130 barrel module prototyping programme for the ATLAS strip tracker
- 2020
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Ingår i: Journal of Instrumentation. - : IOP PUBLISHING LTD. - 1748-0221 .- 1748-0221. ; 15:9
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Tidskriftsartikel (refereegranskat)abstract
- For the Phase-II Upgrade of the ATLAS Detector [1], its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100% silicon tracker, composed of a pixel tracker at inner radii and a strip tracker at outer radii. The future ATLAS strip tracker will include 11,000 silicon sensor modules in the central region (barrel) and 7,000 modules in the forward region (end-caps), which are foreseen to be constructed over a period of 3.5 years. The construction of each module consists of a series of assembly and quality control steps, which were engineered to be identical for all production sites. In order to develop the tooling and procedures for assembly and testing of these modules, two series of major prototyping programs were conducted: an early program using readout chips designed using a 250 nm fabrication process (ABCN-250) [2, 3] and a subsequent program using a follow-up chip set made using 130 nm processing (ABC130 and HCC130 chips). This second generation of readout chips was used for an extensive prototyping program that produced around 100 barrel-type modules and contributed significantly to the development of the final module layout. This paper gives an overview of the components used in ABC130 barrel modules, their assembly procedure and findings resulting from their tests.
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| 2. |
- Dimmock, Andrew P., et al.
(författare)
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On the Regional Variability ofdB/dtand Its Significance to GIC
- 2020
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Ingår i: Space Weather. - : AMER GEOPHYSICAL UNION. - 1542-7390. ; 18:8
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Tidskriftsartikel (refereegranskat)abstract
- Faraday's law of induction is responsible for setting up a geoelectric field due to the variations in the geomagnetic field caused by ionospheric currents. This drives geomagnetically induced currents (GICs) which flow in large ground-based technological infrastructure such as high-voltage power lines. The geoelectric field is often a localized phenomenon exhibiting significant variations over spatial scales of only hundreds of kilometers. This is due to the complex spatiotemporal behavior of electrical currents flowing in the ionosphere and/or large gradients in the ground conductivity due to highly structured local geological properties. Over some regions, and during large storms, both of these effects become significant. In this study, we quantify the regional variability ofdB/dtusing closely placed IMAGE stations in northern Fennoscandia. The dependency between regional variability, solar wind conditions, and geomagnetic indices are also investigated. Finally, we assess the significance of spatial geomagnetic variations to modeling GICs across a transmission line. Key results from this study are as follows: (1) Regional geomagnetic disturbances are important in modeling GIC during strong storms; (2)dB/dtcan vary by several times up to a factor of three compared to the spatial average; (3)dB/dtand its regional variation is coupled to the energy deposited into the magnetosphere; and (4) regional variability can be more accurately captured and predicted from a local index as opposed to a global one. These results demonstrate the need for denser magnetometer networks at high latitudes where transmission lines extending hundreds of kilometers are present.
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| 3. |
- Lee, Joseph G. L., et al.
(författare)
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Is Where Same-Sex Couples Live a Valid Measure for Where Single Lesbian, Gay, and Bisexual People Live in Population Health Research? Results from a National Probability Phone Survey, 2017, United States
- 2020
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Ingår i: Annals of LGBTQ Public and Population Health. - 2688-4518. ; 1:2, s. 96-114
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Tidskriftsartikel (refereegranskat)abstract
- Emerging evidence using the concentration of same-sex couples from the U.S. Census suggests lesbian, gay, bisexual (LGB), and transgender (LGBT; i.e., sexual and gender minority [SGM]) people living as a same-sex couple are concentrated in less healthful neighborhoods. However, it is unclear if findings would be different if based on where LGBT individuals live. Thus, we sought to assess differences in neighborhood, county, and state characteristics between samesex couples and LGBT individuals to inform population health research and policy interventions on LGBT health inequities. In 2017, we conducted a cross-sectional national, probability survey of LGBT adults in the U.S. and geocoded addresses (N = 407). We linked locations with census tract, county, and state characteristics selected based on health inequities theories. In 2019, we used weighted analysis to calculate descriptive statistics and conducted planned contrasts of location characteristics by both cohabitation status and gender. Many location characteristics were similar by cohabitation status and gender. However, the tract proportion of Black residents and county crime rate were lower for cohabitating than non-cohabitating men. State smoke-free air score was weaker for cohabitating than non-cohabitating women. The use of same-sex couples to determine the geographical clustering of LGBT lives in the U.S. may give a reasonable indication of overall spatial characteristics but can underestimate some important determinants of health. Care should be taken using same-sex couples as a proxy for LGBT concentration when racial segregation is a potential confounder.
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