Speaker
Karolos Potamianos
(Lawrence Berkeley National Lab. (US))
Description
The upgraded Pixel detector and the commissioning of the Inner Detector
tracking of the ATLAS experiment for Run-2 at the Large Hadron collider.
Run-2 of the LHC will provide new challenges to track and vertex
reconstruction with higher energies, denser jets and higher rates.
Therefore the ATLAS experiment has constructed the first 4-layer Pixel
detector in HEP, installing a new Pixel layer, also called Insertable
B-Layer (IBL). IBL is a fourth layer of pixel detectors, and has been
installed in May 2014 at a radius of 3.3 cm between the existing Pixel
Detector and a new smaller radius beam-pipe. The new detector, built to
cope with the high radiation and expected occupancy, is the first large
scale application of 3D detectors and CMOS 130nm technology. In addition
the Pixel detector was refurbished with a new service quarter panel to
recover about 3% of defective modules lost during run-1 and a new optical
readout system to readout the data at higher speed while reducing the
occupancy when running with increased luminosity.
In addition, many improvements to Inner Detector track and vertex
reconstruction were developed during the two year shutdown of the LHC.
These include novel techniques developed to improve the performance in the
dense cores of jets, optimisation for the expected conditions, and a
software campaign which lead to a factor of three decrease in the CPU time
needed to process each recorded event.
Author
ATLAS Speakers Committee ID
(ATLAS)
Co-author
Yuji Yamazaki
(Kobe University (JP))
