Shashlyk electromagnetic calorimeter modules with an energy resolution of about 3%/ √ E (GeV) for 50−1000 MeV photons has been developed, and a prototype tested. Details of these improved modules, including mechanical construction, selection of wave shifting fibers and photo-detectors, and development of a new scintillator with improved optical and mechanical properties are described. How the m...

National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 The NIST sealed water calorimeter is intended for direct measurement of absorbed dose to water. This calorimeter was used for a series of approximately 3700 measurements to investigate the so-called heat defect, that is, anomalous endothermic or exothermic effects caused by dissolved gases. The three systems investigate...

The NA48 collaboration is preparing a new experiment at CERN aiming to study CP violation in the K K0 system with an accuracy of 2 10 4 in the parameter Re( = ). Decays into two 's will be recorded by a quasi-homogeneous liquid krypton calorimeter. A liquid krypton calorimeter has been chosen to combine good energy, position and time resolution with precise charge calibration and long-term stab...

KOTO is the first experiment in the world specialized in observing the decay KL → π0νν . The decay is sensitive to new physics scenarios beyond the Standard Model. The most important detector of KOTO is the CsI calorimeter, which measures positions and energies of gammas from KL, in order to reconstruct the vertexes of them. There are mainly three requirements for the calorimeter. First, dynami...

This note describes the performance of the calorimeter clustering algorithms used for ATLAS, and which provide inputs for particle identification. ATLAS uses two principal algorithms. The first is the “sliding-window” algorithm, which clusters calorimeter cells within fixed-size rectangles; results from this are used for electron, photon, and tau lepton identification. The second is the “topolo...

Recent advances in fire test methods and hazard analysis techniques make it useful to reexamine passenger train fire safety requirements. The use of test methods based on heat release rate (HRR), incorporated with fire modeling and hazard analysis, could permit the assessment of potential hazards under realistic fire conditions. The results of research directed at the evaluation of passenger tr...

1. JET RECONSTRUCTION AT ATLAS The ATLAS calorimeter is non-compensating. Its calibration may be performed either globally or locally. Global calibration is a top-down technique where hadronic objects from specific physics processes are reconstructed relative to a fixed (global) electromagnetic scale. The weights are subsequently applied to calorimeter layers and individual cells based on the d...

The physics programme for an electron-positron linear collider with center of mass energy ranging from 90 GeV to 800/1000 GeV, is largely dominated by events with final state containing many jets [1] (essentially di-boson events with W,Z or Higgs decaying into jets). For an experiment on such an accelerator, the goal of the calorimeter can be either to measure well the total flow of energy (in ...