The ATLAS Beam Conditions Monitor

Cindro, V.; Dobos, D.; Dolenc, I.; Frais-Kölbl, H.; Gorišek, A.; Griesmayer, E.; Kagan, H.; Kramberger, G.; Maček, B.; Mandić, I.; Mikuž, M.; Niegl, M.; Pernegger, H.; Tardif, D.; Trischuk, W.; Weilhammer, P.; Zavrtanik, M.

doi:10.1088/1748-0221/3/02/p02004

Cited by 73 publications

(55 citation statements)

References 11 publications

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“…One of them is the ATLAS Beam Conditions Monitor system (BCM) [178]. Its diamond sensors are installed at a distance of z = 1.84 m on either side of the interaction point at |η| = 4.2.…”

Section: Beam Conditions Monitorsmentioning

confidence: 99%

Search for Dark Matter with ATLAS

Pöttgen¹

2016

Springer Theses

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Any physics analysis at a collider experiment heavily relies on an efficient trigger system to filter out potentially interesting events. To ensure stable operation, a continuous and detailed real-time monitoring is essential. Two such online monitoring features for the Central Trigger of the ATLAS experiment at the Large Hadron Collider (LHC) at the European centre for particle physics, CERN, are developed as part of this thesis and are presented in detail. To prepare the ATLAS experiment for the second run of the LHC starting in 2015, among other systems the Central Trigger hardware will be upgraded to remove resource limitations and allow for the connection of newly installed systems. This thesis reports on the corresponding changes and extensions in the simulation of the Central Trigger, the implementation of which is part of this work. A further part of this thesis presents a search for Dark Matter candidates. Cosmological observations indicate that about 80% of the matter content of the universe consist of a form of non-luminous matter which is traceable only due to its gravitational interaction and for which the Standard Model of particle physics does not provide a viable candidate. A number of experiments searches for evidence of Weakly Interacting Massive Particles (WIMPs), that in a natural way could account for the observed present day abundance of this Dark Matter. In recent years, also the search for WIMP pair production at hadron colliders has gathered momentum. A possible signal signature at a collider is a jet originating from initial state radiation and recoiling against a pair of WIMPs, leading to events with a highly energetic jet and a large amount of missing transverse momentum due to the WIMPs leaving the detector without interacting. The signal is thus expected to manifest itself as an excess above the Standard Model prediction at large missing transverse energy (E miss T ). The search for WIMP candidates presented in this thesis uses such mono-jet events, based on 20 fb −1 of proton-proton collision data collected in 2012 with the ATLAS detector at a centreof-mass energy of √ s = 8 TeV. The main Standard Model backgrounds are estimated in a semi-data driven way. The event selection is optimised with respect to the sensitivity for a WIMP signal and the search is performed in eight signal regions of increasing E miss T . No significant excess is observed and model independent limits both at 90% and 95% confidence level (CL) are set on the cross section for new physics. In addition, 90% CL limits are derived on the suppression scale of an effective field theory (EFT) for various operators and compared to the results from other search experiments. The collider limits for all considered effective operators are stronger than the bounds from other experiments at low WIMP masses in the case of spinindependent interactions, and over a large mass range for spin-dependent interactions. In the light of concerns about the applicability of an EFT at LHC energies, the results are furthermore int...

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“…One of them is the ATLAS Beam Conditions Monitor system (BCM) [178]. Its diamond sensors are installed at a distance of z = 1.84 m on either side of the interaction point at |η| = 4.2.…”

Section: Beam Conditions Monitorsmentioning

confidence: 99%

Search for Dark Matter with ATLAS

Pöttgen¹

2016

Springer Theses

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“…The two detectors are the beam condition monitor (BCM) [3] and the beam loss monitor (BLM) [4]. Multiple diamond pads of about 1 x 1 cm 2 are mounted around the interaction point (IP).…”

Section: Diamond Beam Monitor Of Atlasmentioning

confidence: 99%

“…This together with the radiation hardness and excellent thermal conductivity, which alleviates the need for cooling, make diamond an ideal material for luminosity measurement. Diamond detectors have been deployed for beam condition monitoring at various particle colliders, including the PEP II (BaBar [1]), Tevatron (CDF [2]), and LHC (ATLAS [3][4]). …”

Section: Introductionmentioning

confidence: 99%

Diamond particle detectors systems in high energy physics

Gan¹

2015

Proceedings of Technology and Instrumentation in Particle Physics 2014 — PoS(TIPP2014)

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The measurement of luminosity at the Large Hadron Collider (LHC) using diamond detectors has matured from devices based on a rather large pads to highly granular pixelated devices. The ATLAS experiment has recently installed a diamond pixel detector, the Diamond Beam Monitor (DBM), to measure the luminosity in the upgraded LHC with higher instantaneous luminosity. Polycrystalline diamonds were used to fabricate the diamond pixel modules. The design, production, and test beam results are described. CMS also has a similar plan to construct a diamond based luminosity monitor, the Pixel Luminosity Telescopes (PLT). In a pilot run using single crystal diamond, the pulse height was found to depend on the luminosity. Consequently the collaboration decided to use silicon instead due to time constraints. On behalf of the RD42 Collaboration Technology and Instrumentation in Particle

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“…The beam conditions monitor (BCM) [1,20,21] consists of two stations, forward and backward, each with four modules located at z = ±1.84 m and a radius of 5.5 cm. Each module has two diamond sensors of 1 × 1 cm 2 surface area and 500 µm thickness mounted back-to-back.…”

Section: Detector Safetymentioning

confidence: 99%

Operation and performance of the ATLAS Semiconductor Tracker

Barlow

2013

2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications (ANIMM

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The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ -ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leakage currents, are found to be consistent with predictions and are used in the verification of radiation background simulations. A Estimation of the bulk leakage current using models 52The ATLAS collaboration 57 IntroductionThe ATLAS detector [1] is a multi-purpose apparatus designed to study a wide range of physics processes at the Large Hadron Collider (LHC) [2] at CERN. In addition to measurements of Standard Model processes such as vector-boson and top-quark production, the properties of the newly discovered Higgs boson [3,4] are being investigated and searches are being carried out for as yet undiscovered particles such as those predicted by theories including supersymmetry. All of these studies rely heavily on the excellent performance of the ATLAS inner detector tracking system. The semiconductor tracker (SCT) is a precision silicon microstrip detector which forms an integral part of this tracking system. The ATLAS detector is divided into three main components. A high-precision toroid-field muon spectrometer surrounds electromagnetic and hadronic calorimeters, which in turn surround the inner detector. This comprises three complementary subdetectors: a silicon pixel detector covering radial distances 1 between 50.5 mm and 150 mm, the SCT covering radial distances from 299 mm to 560 mm and a transition radiation tracker (TRT) covering radial distances from 563 mm to 1066 mm. These detectors are surrounded by a superconducting solenoid providing a 2 T axial magnetic field. The layout of the inner detector, showing the SCT together with the pixel detector and transition radiation tracker, is shown in figure 1. The inner detector measures the trajectories of charged particles within the pseudorapidity range |η| < 2.5. It has been designed to provide a transverse momentum resolution, in the plane perpendicular to the beam axis, of 1 ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point in the centre of the detector and the z-axis along the beam-pipe. The x-axis points from the interaction point to the centre of the LHC ring and the y-axis points upwards. Cylindrical coordinates (r, φ ) are used in the transverse plane, φ being the azimuthal angle around the beam-pipe. The pseudorapidity η is defined in terms of the polar angle θ as η = − ln tan(θ /2).-1 -

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The ATLAS Beam Conditions Monitor

Cited by 73 publications

References 11 publications

Search for Dark Matter with ATLAS

Search for Dark Matter with ATLAS

Diamond particle detectors systems in high energy physics

Operation and performance of the ATLAS Semiconductor Tracker

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