Author/Authors :
Akesson، نويسنده , , T. and Danielsson، نويسنده , , H. and Dixon، نويسنده , , N. and Dolgoshein، نويسنده , , B. and Eerola، نويسنده , , P. and Farthouat، نويسنده , , P. and Fedin، نويسنده , , O. and Froidevaux، نويسنده , , D. and Gavrilenko، نويسنده , , I. and Hajduk، نويسنده , , Z. and Hauviller، نويسنده , , C. and Ivanov، نويسنده , , V. and Ivochkin، نويسنده , , V. and Jelamkov، نويسنده , , A. and Konovalov، نويسنده , , S. and Lichard، نويسنده , , P. and Lundberg، نويسنده , , B. and Muraviev، نويسنده , , S. and Nadtochy، نويسنده , , A. and Nevski، نويسنده , , P. and Peshekhonov، نويسنده , , V. and Platonov، نويسنده , , Y. and Price، نويسنده , , M. and Romaniouk، نويسنده , , A. and Schegelsky، نويسنده , , V. and Shmeleva، نويسنده , , A. and Smirnov، نويسنده , , A. and Smirnov، نويسنده , , S. and Sosnovtsev، نويسنده , , V.، نويسنده ,
Abstract :
The end-cap Transition Radiation Tracker (TRT), consisting of 36 modules (wheels), is being constructed as a part of the ATLAS Inner Detector at the CERN LHC. This paper describes a method for determining the wire positions inside the straw proportional tubes (SPT), which are the basic building blocks of the ATLAS TRT, with an accuracy of better than 10 μm. The procedure involves moving a narrow monochromatic X-ray beam across the straw and measuring the counting rate as a function of the position of the X-ray beam in the straw. To achieve this goal, a Beam Directing Device (BDD), providing the possibility to direct the X-ray beam in a chosen direction within some solid angle and supplying an accurate angular measurement system, has been constructed. The results of the wire position measurements performed using this BDD on a full-scale mechanical prototype end-cap wheel of the TRT are presented in this paper.
