At the Leading Edge: The ATLAS and CMS LHC Experiments by Dan Green

By Dan Green

Too frequently descriptions of detectors concentrate on the "what" and never the "why". This quantity goals to clarify how the necessities of the physics on the huge Hadron Collider (LHC) outline the detector surroundings. In flip, the detector offerings are made to undertake to that atmosphere. The aim of LHC physics is to discover the mechanism for electroweak symmetry breaking. as a result minuscule cross-sections which must be explored, 0.1 facebook, the LHC must offer a hundred fb-1/yr, or a right away luminosity of 1034 / (cm2 sec). With a number crossing period of 25 nsec, compatible to detector speeds, there'll be 25 occasions occupying each one bunch crossing. therefore the physics calls for speedy, finely segmented, low noise and radiation resistant detectors which supply redundant measurements of the hardly ever produced electrons and muons. to accomplish these ambitions, new floor was once damaged in developing the A Toroidal LHC gear (ATLAS) and Compact Muon Solenoid (CMS) detectors within the vertex detectors, monitoring structures, calorimetry, robust magnets, muon structures, entrance finish electronics, set off platforms, and within the information acquisition equipment used.

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Extra resources for At the Leading Edge: The ATLAS and CMS LHC Experiments

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As seen in the figure, the shower is fully contained over a depth t ∼ 20. 5, or a total of 40 depth samples is called for to achieve good energy resolution. The shower maximum occurs at tmax ∼ 7 and the full width of the shower development is ∆t ∼ 7. The number of showering particles Ns is large, peaking in Fig. 15 at ∼ 100 per sample. With fine sampling and a very uniform medium the stochastic fluctuation of the number of shower particles, Ns , can largely determine √ the energy resolution, dE/E ∼ 1/ Ns ∼ Ec /E.

The constant term arises from the nonuniformity of the medium and the requirement is then clearly to have b 1%. This means that the manufacturing process control of the ECAL must be very stringent. 25 TeV for 1 TeV mass Z + Z scattering, so that the coefficient a should be < 19%. To achieve that it is important to first understand the electromagnetic showering process in better detail. 5in — At the Leading Edge ... b866-ch01 D. Green an electron is that energy where radiative processes are comparable in probability to nonradiative processes such as ionization.

US groupsb took responsibility for the forward endcaps of the pixel detector. The work of the first years focused on very basic R&D on sensors and radiation-hard readout chip concepts. 6, 7 Building blocks of the readout and small prototype chips followed. 8 The mechanical detector layout and a detailed module design were developed for the Technical Design Report9 (TDR) in 1998. A first realization of the readout architecture in a full readout chip was a milestone in 2002. 8 µm DMILL11 process, came close to meeting the requirements but would have needed at least one more iteration.

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