Speaker
Craig Buttar
(University of Glasgow (GB))
Description
To meet the challenges of tracking at the luminosities delivered by the HL-LHC requires replacing and upgrading the tracking systems. To be able to perform pattern recognition and vertexing in events with pile-up of up to 200 requires a larger area pixel system within the tracker. The increase in area requires the development of large area planar detectors for pixel layers at large radii and the pixel endcaps. The paper reports on the development of large area sensors of area 2x2cm2 have been fabricated and mounted onto 4 FE-I4 readout ASICs, so called quad-modules, and their performance evaluated in the laboratory and testbeam. The current-voltage characteristics of the sensors have been studied and this has been used to improve the design of the biasing, guard rings and doping of the dicing streets. The assembled modules have been characterised in the laboratory to evaluate noise, threshold and bump-bond yield. A particular challenge in producing thinned large area modules is the bump-bonding, where low yield can be observed due to bowing of the sensor and readout chip during the bonding process. A new bump-bonding process using backside compensation to address the issue of low yield will be discussed. The performance of the modules in testbeams will also be presented.
Primary author
Craig Buttar
(University of Glasgow (GB))
Co-authors
Dr
Andrew Blue
(University of Glasgow)
Andrew Stewart
(University of Glasgow (GB))
Dean Charles Forshaw
(University of Liverpool-Unknown-Unknown)
Gianluigi Casse
(University of Liverpool (GB))
Helen Hayward
(University of Liverpool (GB))
Ilya Tsurin
(University of Liverpool (GB))
Joleen Pater
(University of Manchester (GB))
Joseph Ashby
(University of Glasgow (GB))
Kate Doonan
(University of Glasgow (GB))
Kenneth Gibb Wraight
(University of Glasgow (GB))
Marko Milovanovic
(University of Liverpool (GB))
Michael Wormald
(University of Liverpool (GB))
Paul Dervan
(Department of Physics-Oliver Lodge Laboratory-University of Liv)
Prof.
Philip Patrick Allport
(University of Liverpool (GB))
Richard Bates
(University of Glasgow (GB))
Samuel Joseph Crawley
(University of Glasgow (GB))
Sergey Burdin
(University of Liverpool (GB))
Sven Wonsak
(University of Liverpool (GB))
Thomas Mcmullen
(University of Glasgow (GB))
Val O'Shea
(University of Glasgow (GB))
