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.

Abstract--The Transition Radiation Tracker (TRT) is one of three particle tracking detectors now under construction for the ATLAS experiment, whose goal is to exploit the highly exciting new physics potential at CERN's next accelerator, the so called Large Hadron Collider (LHC).The TRT consists of 370000 straw proportional tubes of 4 mm diameter with a 30 micron thick anode wire, which will be operated with a Xe/CO 2 /O 2 gas mixture at a high voltage of approximately 1.5 kV. While the construction of the TRT is now well under way, a number of interesting and challenging questions need to be solved with regard to wire aging phenomena, which are induced by pollution originating from very small amounts of silicon-based vacuum materials in some components of the gas system. Finally a guideline to avoid aging in wire chamber detectors in high luminosity experiments is given.

Adsorption on a solid adsorbent is the fundamental processes in the field of separation processes, purification of gases, adsorption cooling, advanced adsorption cooling, and extensive work on hydrogen storage. The understanding of the thermodynamic properties of adsorbent plus adsorbate system is important to analyze. Information concerning the relevant adsorption equilibrium and characterized of adsorbent is generally an essential requirement for the analysis and design of an adsorption separation process. For practical application, theadsorption equilibrium must be known over a broad range of operation temperatures. Also, the isotherms of pure species are fundamental information for dynamic simulation of adsorbers. The main objective of this research is to design kinetic adsorption test rig to investigate the capacity and rate of adsorption on adsorbent and adsorbate pair’s. The result of design kinetic adsorption test rig including dimensions of vapor vessel (pressure vessel) and measuring cell. The volume of vapour vessel is 1000 ml and measuring cell is 100 ml. Kinetic adsorption test rig was manufactured to investigate capacity and rate of adsorption up to 40 bar.

AbstrakSistem adsorpsi adalah salah satu cara atau metoda yang paling efektif untuk memisahkan CO 2 dengan zat lainnya yang dihasilkan dari pembakaran bahan bakar fosil. Pada rancangan untuk aplikasi tersebut, disamping data karakteristik material berpori (adsorben), data penyerapan CO 2 pada adsorben (kinetik dan thermodinamika) juga dibutuhkan. Penelitian ini bertujuan menghasilkan data adsorpsi isotermal pada tekanan sampai dengan 3,5 MPa dengan menggunakan metoda tak langsung (metoda volumetrik) pada temperatur isotermal 300, 308, 318 dan 338 K. Adsorben yang digunakan adalah karbon aktif berbahan dasar batubara Kalimantan Timur yang diproduksi dengan menggunakan metode aktivasi fisika (CO 2 ) derngan luas permukaan karbon aktif (karbon aktif KT) adalah 668 m 2 /g dan volume porinya 0,47 mL/g. Karbon dioksida (CO 2 ) yang digunakan adalah karbon dioksida high purity dengan kemurnian 99,9%. Data yang diperoleh dari hasil eksperimen kemudian dikorelasi dengan menggunakan model persamaan Langmuir dan Toth. Hasil penelitian menunjukkan bahwa Kapasitas penyerapan maksimum adalah 0,314 kg/kg pada temperatur 300 K dan tekanan equilibrium 3384,69 kPa. Hasil regresi data eksperimen dengan menggunakan model Langmuir dan Toth adalah 3,4% dan 1,7%. AbstractHigh Pressure Adsorption Isotherm of CO 2 on Activated Carbon using Volumetric Method. Adsorption system is ones of the most effective methods for CO 2 separating with other substances that produced from the burning of fossil fuels. In the design for that application, beside of characteristics of porous material (adsorbent) data, CO 2 adsorption data on the adsorbent (kinetic and thermodynamic) are also needed. The aim of this research is resulting isothermal adsorption data at pressures up to 3.5 MPa by indirect methods (volumetric method) at isothermal temperature of 300, 308, 318 and 338 K. Adsorbent that used in this research is activated carbon made from East of Kalimantan coals by physical activation method (CO 2 ) which is the surface area of activated carbon is 668 m 2 /g and pore volume is 0.47 mL/g. Carbon dioxide (CO 2 ) that used in this research is high purity carbon dioxide with a purity of 99.9%. Data from the experiment results then correlated using the Langmuir and Toth equations model. The results showed that the maximum adsorption capacity is 0.314 kg/kg at 300 K and 3384.69 kPa. The results of regression of experiment data using Langmuir and Toth models were 3.4% and 1.7%.