[en] The characteristics of the straw detector with cathode read-out are presented. The detector has a high and uniform efficiency and its spatial resolution is about 70 μm. These detectors can be used as precision coordinate detectors in experiments on accelerators and in image detectors. (author)

[en] This talk will consist of a brief review of the ATLAS Inner Detector (ID) Semiconductor Tracker (SCT) strip detector (both silicon and gallium arsenide) beam tests conducted at the ATLAS test beam facility at the CERN SPS H8 beamline. It will include a brief overview of the H8 facilities, the experimental layout of the SCT/Strip apparatus, the data acquisition system, some of the online software tools and the high precision silicon hodoscope and timing modules used. A very brief indication of some of the main varieties of detector systems tested and the measurements performed will be given. Throughout some emphasis will be placed on the contributions and-interests of members of the Melbourne group. (author)

[en] The Atlas Detector Analog Memory (ADAM) chip has been designed for use at the Large Hadron Collider as a digital front end readout for the μ-strip detectors used in the ATLAS semiconductor Tracker (SCT). A particle level study has been done and shows that is possible to see a signal above background. the main cut against the background being impact parameter and calorimeter isolation cuts. The current analysis involves repeating the particle level study, however using a full simulation of the ATLAS detector using the GEANT package. In particular the impact of the Inner tracker design on this decay channel is being investigated. A full simulation of Higgs and tt-bar events was performed using the geometry described in the ATLAS technical proposal. A full reconstruction was performed using electro-magnetic calorimeter ( EM) clusters as track seeds. A crude EM calibration, using simulated electrons at four different energies, was also performed to correct for the energy. Preliminary results indicate that the impact parameter cut against the tt-bar background doesn't work when doing a full detector simulation

[en] Results of the test of the Cherenkov counter with a radiator of silicon dioxide aerogel produced at the JINR Laboratory of Nuclear Problems are given. The average number of the photoelectrons recorded in the events generated by cosmic particles was 6.3 for the aerogel with a refraction index of n = 1.05 and a thickness of L = 6 cm. 4.7 photoelectrons were obtained with the aerogel that had n = 1.02 and L = 8.4 cm. A threshold curve was measured on cosmic muons

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[en] The fast and simple method of testing straightness and uniformity of the straw is proposed. The method is based on the measurement of the integral image formed by passing a parallel light beam across the straw. The basic parts of the set-up are presented. It consists of the parallel light forming optical system; special precise mechanical system to set the testing straw; CCD camera is used as a visible light detector. The main characteristics of the set-up are measured: the spatial resolution in the focal plane is as good as a size of a single pixel; the spatial resolution dependence from the distance to the focal plane. The total expositions time including one straw installation into the special supports, collection and calculation of the light image and obtaining final results are less than 20 seconds. (author)

[en] The group is involved in the construction of the liquid argon calorimeter of the ATLAS detector. Following an intense R and D phase, the final detailed design at the ATLAS calorimeter was finalized, written and approved by the LHC committee. ATLAS is now in a pre-construction phase which implies that the group activities are mainly devoted to the installation of the assembly line of the electromagnetic pre-sampler sectors. Our R and D activities on the calorimeter electronics were pursued along two lines: the optimization of the filtering amplifiers and a participation to the development of optical links for data transmission. Liquid argon pollution tests under radiation were also achieved at SARA. They proved the radiation hardness of the liquid argon calorimeter. We recently showed that the search for heavy right-handed neutrinos up to m_N < 3 TeV is possible with the ATLAS detector. (authors)

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