The radiation tolerance of MTP and LC optical fibre connectors to 500 kGy(Si) of gamma radiation

Hall, David C.; Hamilton, Paul; Huffman, B. T.; Teng, P. K.; Weidberg, A. R.

doi:10.1088/1748-0221/7/04/p04014

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…The results were dominated by the systematic effects of light coupling into the fibre and were consistent only with RIA of the fibres themselves. The evidence we have indicates that these standard parts will be sufficiently radiation hard for HL-LHC applications [13].…”

Section: Optical Connectorsmentioning

confidence: 78%

Summary of the effects of radiation upon the passive optical components of the Versatile Link

Huffman¹,

Weidberg

2014

J. Inst.

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The LHC luminosity upgrade, known as the High Luminosity LHC (HL-LHC) will require high-speed optical links to read out data from its detectors. The ATLAS and CMS experiments in collaboration with CERN have developed the Versatile Link in order to address the technical issues of optical data transmission within the harsh radiation environment experienced by any experiment within the HL-LHC. Passive optical components can suffer damage in the form of reduced optical transparency (radiation induced absorption or RIA), reduced bandwidth, and mechanical damage to the components themselves and their connection hardware. This paper summarizes the results of the optical and mechanical tests that have been performed on the Versatile Link's passive optical components. The authors conclude that two single mode and two multimode fibres, as well as standard connector components, can be qualified for use in the HL-LHC environment. The qualifying fibers are: Corning SMF-28e, DrakaElite® SRH-SMF, Corning Clearcurve® OM4 multimode graded index, and DrakaElite® SRH-MMF.

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Section: Optical Connectorsmentioning

confidence: 78%

Summary of the effects of radiation upon the passive optical components of the Versatile Link

Huffman¹,

Weidberg

2014

J. Inst.

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“…18) which was experimentally verified once the W and Z bosons were discovered [37][38][39][40][41]. It also predicted a massive scalar Higgs boson, whose mass could not be determined from the other parameters of the theory.…”

Section: Glashow-salam-weinberg Electroweak Theorymentioning

confidence: 86%

Section: Prefacementioning

confidence: 99%

“…As this research does not easily relate to the Higgs boson, it is excluded from this thesis. However, I have published articles on the radiation tolerance of optical fibres [17] and their connectors [18].1 The γγ, ZZ and W W decay channels quickly gave sensitivity to the Higgs boson ultimately discovered. 2 Dedicated high mass searches for H → W W have also been performed [11].…”

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confidence: 99%

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Discovery and Measurement of the Higgs Boson in the WW Decay Channel

Hall¹

2015

Springer Theses

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In the Standard Model of particle physics, the non-zero masses of the W and Z bosons and the fermions are generated through interactions with the Higgs field, excitations of which correspond to Higgs bosons. Thus, the experimental discovery of the Higgs boson is of prime importance to physics, and would confirm our understanding of fundamental mass generation.This thesis describes a search for the gg → H → W W → ν ν process of Higgs boson production and decay. It uses the LHC Run I dataset of pp collisions recorded by the ATLAS detector, which corresponds to an integrated luminosity of 4.5 fb −1 at √ s = 7 TeV and 20.3 fbTeV. An excess of events is observed with a significance of 4.8 standard deviations, which is consistent with Higgs boson production. The significance is extended to 6.1 standard deviations when the vector boson fusion production process is included. The measured signal strength is 1.11−0.21 at m H = 125 GeV. A cross section measurement of W W production, a major background to this search, is also presented using the √ s = 7 TeV dataset only.iii PrefaceAs a DPhil research topic, the H → W W analysis has proven to be a baptism of fire. It is the most complicated of the three "discovery channels", 1 as it involves a variety of physics objects and requires a good understanding of many difficult backgrounds. As such, the analysis took huge effort from a large number of individuals. My role focussed on theoretical aspects of the signal and background modelling, and these parts shall be emphasised. I contributed to multiple iterations of the analysis [1][2][3][4][5][6][7][8], though the version presented here is unpublished at the time of writing [9]. I also co-authored the third Yellow Report produced by the LHC Higgs Cross Section Working Group [10].When I began the degree in October 2010, there was no direct evidence for a Higgs boson. This thesis is written from a personal perspective and motivates a low mass search by electroweak fits, when in fact this aspect was motivated later by observations of a resonance in the γγ and ZZ channels.2 Also, an advanced search strategy is described, though the discovery of H → W W was actually a gradual process with multiple iterations of blinding, optimising and unblinding the analysis. As more data were recorded and the analysis was enhanced, the results improved.Early on, I gained relevant insight by performing multiple W W cross section measurements [12][13][14][15]. My main contribution was a jet veto correction factor applied to the W W signal, which reduces the dominant uncertainty in the analysis. This measurement shall be described when considering the W W background to the H → W W search.To qualify for authorship within the ATLAS collaboration, I performed Run Control shifts. I also worked within the Versatile Link project [16] to investigate radiation hardened optical components for the HL-LHC. As this research does not easily relate to the Higgs boson, it is excluded from this thesis. However, I have published articles on the radiation toler...

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“…optical components [14] on this device continues. This is a joint project involving ATLAS, CMS, and CERN but the project is being implemented as a general purpose link.…”

Section: Jinst 9 C02033mentioning

confidence: 95%

Plans for the Phase II upgrade to the ATLAS detector

Huffman¹

2014

J. Inst.

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CERN has planned a series of upgrades for the Large Hadron Collider (LHC). The last in this current series of planned upgrades is designated the High Luminosity LHC (HL-LHC) and as the name suggests will bring the Luminosity up to 5 × 10 34 cm −2 s −1 . The ATLAS detector will be extensively changed to meet the challenges of this upgrade (termed the "Phase II" upgrade). There are many systems that require modification in this regime, but this paper focuses on the subsystems requiring the most radical changes.The ATLAS inner tracker is being completely rebuilt for Phase II. The TRT is removed in favor of an all-new all-silicon tracker. The changes to the pixel system, barrel and end-cap strip detectors are explained. In addition, the muon detector will be modified and the muon and electron triggers will be modified to include tracking regions of interest and to improve muon resolution. In this way trigger rates can be brought under control while maintaining constant trigger thresholds. KEYWORDS: Particle tracking detectors (Solid-state detectors); Muon spectrometers; Trigger concepts and systems (hardware and software) 1 For the ATLAS collaboration.

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The radiation tolerance of MTP and LC optical fibre connectors to 500 kGy(Si) of gamma radiation

Cited by 4 publications

References 6 publications

Summary of the effects of radiation upon the passive optical components of the Versatile Link

Summary of the effects of radiation upon the passive optical components of the Versatile Link

Discovery and Measurement of the Higgs Boson in the WW Decay Channel

Plans for the Phase II upgrade to the ATLAS detector

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