This is a summary of the beyond the Standard Model (including model building) working group of the WHEPP-X workshop held at Chennai from January 3 to 15, 2008.
A systematic study of the behavior of the ATLAS monitored drift tubes (MDTs) under controlled irradiation by alpha particles has been performed. The aim of the study was two fold: to quantify the ...response of the tubes to alpha particles and consequence to heavily ionizing particles and to measure aging effects under the nominal operating conditions. A setup of a well controlled radium (/sup 226/Ra) source was used in order to enrich the tube gas (Ar, CO/sub 2/) with the alpha emitter /sup 222/Rn and irradiate the tubes internally. The ionization produced by an alpha particle with mean energy of 6.4 MeV has been measured. The energy deposition of the alpha and beta rays of the source inside the tube was computed by simulating the MDT geometry and the accumulated charge to the tube wire at operating conditions was calculated. The results of aging effects up to an accumulated charge of 41.5 mC are given by using the alpha-irradiation setup.
The muon spectrometer of the ATLAS detector for the Large Hadron Collider is designed to provide a muon transverse momentum resolution of 2%–10% for momenta between 6
GeV and 1
TeV over a ...pseudo-rapidity range of |
η|⩽2.7. This required the development of precision drift chambers with a track position resolution of
40
μ
m, the Monitored Drift Tube (MDT) chambers. We report about the construction of the three main types of MDT chambers for ATLAS, test results and the first production experience.
The properties of a detector consisting of a large barium fluoride crystal and a multiwire proportional chamber operating at low pressure with TMAE have been studied. Measurements of the time ...resolution, pulse width, energy resolution, photoelectron yield and the effective energy threshold were carried out in a test beam using minimum ionizing particles. Although the detector is sensitive to signals originating from an adsorbed layer of TMAE from the crystal surface, no indication of such a signal was observed.
This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a ...consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.
The highly parallel 2D-clustering FPGA implementation used for the input system of the Fast TracKer (FTK) processor for the ATLAS experiment of the Large Hadron Collider (LHC) at CERN is presented. ...The LHC after the 2013-2014 shutdown periods is planned to have increased luminosity, which will make it more difficult to have efficient online selection of rare events due to the increase of the overlapping collisions. FTK is a highly-parallelized hardware system that improves the online selection by executing real time track finding using the information from the silicon inner detector. The FTK system requires fast and robust clustering of the hits retrieved from the silicon detector on FPGA devices. We show the development of the original input boards and the implemented clustering algorithm. For the complicated 2D-clustering, a moving window technique is used to minimize the use of FPGA resources. The combination of custom developed boards and implementation of the clustering algorithm provides sufficient processing power to meet the specifications for the silicon inner detector of ATLAS up to the maximum LHC luminosity planned until 2022. The developed algorithm is easily adjustable to other image processing applications that require real-time 2D-clustering.
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