The center of mass energy of LHC is 14 TeV, about 7 times higher then the most powerful present collider at Fermi National Lab. In the accelerator two proton beams circulate in opposite direction, which collide at several intersection regions.
The Duke University High Energy Physics Group is a member of the ATLAS collaboration. Our immediate interest is in constructing a part of the ATLAS detector, namely the Transition Radiation Tracker (TRT).
The TRT is a part of the inner tracker and it occupies radii between ~60 cm and ~110 cm and +/- 200 cm in z. The system consists of more than 370,000 straws. The TRT consists of three different sections - two endcap detectors with radial straws and one barrel detector with straws oriented parallel to the magnetic field direction. Hence, the barrel TRT measures r-phi while the endcap TRT measures phi-z.
There are two functions of the TRT. One is to provide the tracking (of charged particles) and the other is to identify high energy electrons using transition radiation. The basic elements of the detector is 4 mm diameter thin wall (60 microns) straws and polyethylend foils (endcap TRT) or polypropylene-polyethylene fibers (barrel TRT) between straws.