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Lessons learned in high frequency data transmission design: ATLAS strips bus tape

Journal of Instrumentation IOP Publishing 12:1 (2017)

Authors:

J Dopke, V Fadeyev, AA Grillo, B Lin, F Martinez-Mckinney, J Nielsen, P Phillips, C Sawyer, S Sullivan, J Volk, R Wastie, T Weidberg

Abstract:

Requirements of HEP experiments lead to highly integrated systems with many electrical, mechanical and thermal constraints. A complex performance optimisation is therefore required. High-speed data transmission lines are designed using copper-polyimide flexible bus tapes rather than cable harnesses to minimise radiation length. Methods to improve the signal integrity of point-to-point links and multi-drop configurations in an ultra-low-mass system are described. FEA calculations are an essential guide to the optimisation of a tape design which supports data rates of 640 Mbps for point-to-point links over a length of up to 1.4 m, as well as 160 Mbps for multi-drop configuration. The designs were validated using laboratory measurements of S-parameters and direct bit error ratio tests.
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Prospects for new physics in $\tau \to l \mu \mu$ at current and future colliders

(2017)

Authors:

Chris Hays, Manimala Mitra, Michael Spannowsky, Philip Waite
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Custom ultrasonic instrumentation for flow measurement and real-time binary gas analysis in the CERN ATLAS experiment

Journal of Instrumentation IOP Publishing 12:01 (2017) c01091-c01091

Authors:

M Alhroob, M Battistin, S Berry, A Bitadze, P Bonneau, G Boyd, O Crespo-Lopez, C Degeorge, C Deterre, B Di Girolamo, M Doubek, G Favre, G Hallewell, S Katunin, D Lombard, A Madsen, S McMahon, K Nagai, A O'Rourke, B Pearson, D Robinson, C Rossi, A Rozanov, E Stanecka, M Strauss, V Vacek, R Vaglio, J Young, L Zwalinski
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Electroweak measurements at the fermilab Tevatron

Proceedings of the 52nd Rencontres de Moriond - 2017 QCD and High Energy Interactions (2017) 35-38

Abstract:

The Fermilab Tevatron produced proton-antiproton collisions at a center-of-mass energy of vs = 1.96 TeV between 2001 and 2011. Using an integrated luminosity of ˜ 10 fb-1 collected by each of the two general-purpose experiments CDF and D0, many high-precision measurements were performed. I summarize the three electroweak measurements with the highest precision: the W-boson mass, the top-quark mass, and the effective Z-boson vector couplings.

Measurement of the sm higgs boson mass in the diphoton and 4` decay channels using the atlas detector

Proceedings of Science (2017)

Abstract:

One of the fundamental properties of the Higgs boson, its mass, is measured by studying the invariant mass of the 4` and diphoton decay channels with about 36 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider (LHC). Since in these channels the final state can be fully reconstructed, an invariant mass peak with a good experimental resolution can be obtained in a model independent way and used as an input to compare other Higgs properties measurements with the SM predictions. The measured values of the Higgs boson mass for the H → ZZ∗ → 4` and H → γ γ decay modes are mH = 124.88 ± 0.37 (stat) ± 0.05 (syst) GeV and mH = 125.11 ± 0.21 (stat) ± 0.36 (syst) GeV respectively, and the mass derived from the combined fit is mH = 124.98 ±0.19 (stat) ±0.21 (syst) GeV. These results are in good agreement with the LHC Run-1 average of 125.09 ± 0.24 GeV.