Pixel-Pad Detectors

Coordinating university or institute

Lund University, www.lunduniversity.lu.se

Project description

By the start of the Relativistic Heavy Ion Collider (RHIC) in year 2000 at Brookhaven National Laboratory in New York the energy for collision of heavy nucleiincreased by a factor 10. The Lund group participates in the PHENIX experiment at RHIC which is designed to study the Quark Gluon Plasma, a very hot (100000 times hotter than the sun) and dense state of matter prevailing in the first microseconds of the Big Bang. This state can be produced by nuclear collisions at high energy and it was found for the first time by PHENIX (and others) at RHIC. The studies continue now at LHC atCERN. The Lund group, invented a new type of detector (named pixel-pad detector) for the trackingof charged particlesand,thanks to close cooperation with Swedish industry,provided a unique solution for electronics construction in extremely thin format. Together with Swedish industrial partners 2integrated circuits (ASICs) were designed and produced. The circuit board consisting of 4 bare silicon diebonded by CHIP ON BOARD technique on 100 micron thin KAPTON. In total 80 square meters of detector was constructed. One part is shown in the picture. Development and construction took place 1995- 2000. The system was running until 2016. The techniques used are still unique and competitive.




Lund University, Faculty of Engineering:

  • Anders Oskarsson, Professor, physicist, project leader, detector expert, integration of equipment in PHENIX
  • Hans Åke Gustafsson, Professor, physicist, deputy project leader, detector expert, integration of equipment in PHENIX
  • Lennart Österman, Research engineer, electronics, specification, circuit board design and board layout, CAD, R&D, quality control

Core deliverables

  • System design
  • Design and construction of Digital ASIC for TEC detector
  • Design and construction of Digital ASIC for pixel-pad detector
  • Design and assembly of 5000 readout cards with Chip on Board on KAPTON
  • Test and burn-in of front end electronics
  • Assembly and integration in PHENIX at BNL

Industry involvement

  • SiCon
  • XiCON

Total budget

EUR 900,000


  • Lund University
  • Vanderbilt University
  • Stony Brook University
  • Oak ridge National Laboratory
  • Brookhaven National Laboratory
  • Weizman Institute


Procurement codes

Electronics and radio frequency
Particle and photon detectors

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