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The Vertex Detector at the ILC

 

 

The Vertex Detector at the ILC  
         
         
  The International Linear Collider (ILC) at CERN is a proposed new electron-positron collider. In combination with the Large Hadron Collider at CERN it allows physicists to explore energy regions beyond the reach of today’s accelerators. At these energies researchers anticipate significant discoveries leading to a radical new understanding of what the universe is made of and how it works. The ILC electron-positron collisions will lead to discoveries that are expected to be providing compelling answers to questions, such as what the identity of dark matter is or if extra dimensions do exist.

The ILC design implies two facing 20 km long linear accelerators (figure A on the right), hurling beams of electrons and positrons toward each other (figure B on the right) close to the speed of light. Each beam contains ten billion electrons or positrons compressed to a minuscule thickness of three nanometers.
  Figure at top: Arist's view of the future ILC (Courtesy of KEK, with
permission). Figure below. Artist's view of an electronpositron collision (Courtesy of DESY Hamburg).
Figure A above: Arist's view of the future ILC (Courtesy of KEK); Figure B below: Artist's view of an electronpositron collision (Courtesy of DESY Hamburg).
 
       
  As the particles speed down the collider, superconducting accelerating cavities give them an increasing amount of energy. They meet in an intense crossfire of collisions. The ILC beam energy can be adjusted to focus the respective process of interest.

At this future linear electron-positron-collider, a set of cylindrical detectors arranged in ladders around the interaction point will define the vertex detector. Each ladder is an array of pixel cells read out at the end of the ladder outside the sensitive volume. We are proposing an active pixel sensor array with a DEPFET as the pixel cell. It is mandatory to minimize multiple scattering contributions to the impact parameter resolution by reducing any material (such as cooling material, sensor supports and sensor material itself) in the detectors area to a minimum.

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