The ATLAS Transition Radiation Tracker (TRT) proportional drift tube: design and performance

A straw proportional counter is the basic element of the ATLAS Transition Radiation Tracker (TRT). Its detailed properties as well as the main properties of a few TRT operating gas mixtures are described. Particular attention is paid to straw tube performance in high radiation conditions and to its operational stability

The ATLAS TRT electronics

The ATLAS inner detector consists of three sub-systems: the pixel detector spanning the radius range 4cm-20cm, the semiconductor tracker at radii from 30 to 52 cm, and the transition radiation tracker (TRT), tracking from 56 to 107 cm. The TRT provides a combination of continuous tracking with many projective measurements based on individual drift tubes (or straws) and of electron identification based on transition radiation from fibres or foils interleaved between the straws themselves. This paper describes the on and off detector electronics for the TRT as well as the TRT portion of the data acquisition (DAQ) system

Complex Estimation of Functional Changes in the Organism of Healthy Rats Which Consumed Water of the Lake Kagul as Drinking Water.

In the work results of a complex estimation of functional changes in an organism of healthy rats which consumed water of the lake of Kagul as drinking water are given. Conformity of water of the lake of Kagul to requirements of operating standard documents except for nitrogen ammonia, nitrogen nitrit and the general organic carbon is established. 3 kinds of cyanobacteriaе, in particular high levels of Aphanocapsa pulverea, which causes water "flowering" are revealed. It is shown that the use of water of the lake of Kagul as drinking, causes strengthening of activity of central nervous system in healthy rats; some increase of possibilities of organism sensitisation development and specific phagocytosis, certain displays of disbalance of hummoral component of the immune response and expansion of autoimmune processes in the organism. In the view of absence of hyginicaly significant concentration of anthropogenous pollutants, the idea that the revealed biological effects are a consequence of cyanotoxins action produced by revealed cyanobacteriaе is presented. Necessity of expansion and continuation of researches on cyanobacteriaе in the context of their revealing in water, their identifications, influences of these xenobiotics on condition of warm-blooded animals and the human is proved

Assessment of Correction Effectivenes of Psychoemitional State in Pregnant Women After Application of Assisted Reproductive Technologies

To determine the role and effectiveness of the proposed the­rapeutic and preventive complex in the correction of psychoemotional state in the dynamics of pregnancy in pregnant women after assisted reproductive technologies (ART) application in order to improve the tactics of antenatal obser­vation and prevention of obstetric and perinatal complications. 299 pregnant women were comprehensively examined and a set of therapeutic and preventive measures was carried out: the main group included 249 women whose pregnancy occurred as a result of ART application. The control group consisted of 50 pregnant women with spon­taneous pregnancy. The complex of measures for pregnant women after ART application included: micronized pro­gesterone, magnesium oxide, folic acid, L-arginine aspartate, Omega-3 polyunsaturated fatty acids and long-term psychological correction – before ART program, at 8-10 weeks of pregnancy, at 16-18 weeks of pregnancy and at 28-30 weeks of pregnancy. Introduction of the proposed complex of psychoemotional correction contributed to the formation of reactive anxiety and personal anxiety levels at a moderate level in women of subgroups IA-44 (89.8%) and 43 (87.6%), IIA – 43 (89.6%) and 44 (91.7%) and IIIA – 30 (83.3%) and 26 (72.2%), which is considered to be an adaptive, physiological type during pregnancy. The positive effect of the proposed complex of psychoemotional correction demonstrates the improvement of processes of formation of type of component gestational dominant, its return to the optimal type in women of subgroup IA – 41 (83.6%), IIA – 39 (81.3%) and IIIA – 26 (72.2%) that is close to the physiological course of pregnancy and contributes to the reduction of perinatal and obstetric complications among pregnant women of these subgroups

Status of design and construction of the transition radiation tracker (TRT) for the ATLAS experiment at the LHC

The ATLAS Inner Detector consists of three sub-systems, the pixel detector at the innermost radius, the semiconductor tracker at intermediate radii, and the transition radiation tracker (TRT) at the outermost radius in front of the electromagnetic calorimeter. The TRT provides a combination of continuous tracking with many projective measurements based on individual drift-tubes (or straws) and of electron identification based on radiator fibres or foils interleaved between the straws themselves. This paper describes the current status of design and construction of the various components of the TRT: the assembly of the barrel modules has recently been completed, that of the end-cap wheels is well underway, and the on-detector front-end electronics is in production. The detector modules and front-end electronics boards will be integrated together over the next year, the barrel and end-cap TRT parts will be assembled and tested with their SCT counterparts during 2005 and installation and commissioning in the ATLAS pit will take place at the end of 2005 and the beginning of 2006. (8 refs)

Acceptance tests and criteria of the ATLAS transition radiation tracker

The Transition Radiation Tracker (TRT) sits at the outermost part of the ATLAS Inner Detector, encasing the Pixel Detector and the Semi-Conductor Tracker (SCT). The TRT combines charged particle track reconstruction with electron identification capability. This is achieved by layers of xenonfilled straw tubes with periodic radiator foils or fibers providing TR photon emission. The design and choice of materials have been optimized to cope with the harsh operating conditions at the LHC, which are expected to lead to an accumulated radiation dose of 10 Mrad and a neutron fluence of up to 2 . 10(14) n/cm(2) after ten years of operation. The TRT comprises a barrel containing 52 000 axial straws and two end-cap parts with 320 000 radial straws. The total of 420 000 electronic channels (two channels per barrel straw) allows continuous tracking with many projective measurements (more than 30 straw hits per track). The assembly of the barrel modules in the US has recently been completed, while the end-cap wheel construction in Russia has reached the 50% mark. After testing at the production sites and shipment to CERN, all modules and wheels undergo a series of quality and conformity measurements. These acceptance tests survey dimensions, wire tension, gas-tightness, high-voltage stability and gas-gain uniformity along each individual straw. This paper gives details on the acceptance criteria and measurement methods. An overview of the most important results obtained to-date is also given

ATLAS Transition Radiation Tracker test-beam results

Several prototypes of the Transition Radiation Tracker for the ATLAS experiment at the LHC have been built and tested at the CERN SPS accelerator. Results from detailed studies of the straw-tube hit registration efficiency and drift-time measurements and of the pion and electron spectra without and with radiators are presented. (10 refs)