Abstract
The physics programme of the TOTEM experiment requires the detection of very forward protons scattered by only a few microradians out of the LHC beams. For this purpose, stacks of planar Silicon detectors have been mounted in moveable near-beam telescopes (Roman Pots) located along the beamline on both sides of the interaction point. In order to maximise the proton acceptance close to the beams, the dead space at the detector edge had to be minimised. During the detector prototyping phase, different sensor technologies and designs have been explored. A reduction of the dead space to less than 50 μm has been accomplished with two novel silicon detector technologies: one with the Current Terminating Structure (CTS) design and one based on the 3D edge manufacturing. This paper describes performance studies on prototypes of these detectors, carried out in 2004 in a fixed-target muon beam at CERN's SPS accelerator. In particular, the efficiency and accuracy in the vicinity of the beam-facing edges are discussed.
Highlights
√ running scenario for the most precise total pp cross-section measurement at s = 14 TeV
Stacks of planar Silicon detectors have been mounted in moveable near-beam telescopes (Roman Pots) located along the beamline on both sides of the interaction point
A reduction of the dead space to less than 50 μm has been accomplished with two novel silicon detector technologies: one with the Current Terminating Structure (CTS) design and one based on the 3D edge manufacturing
Summary
The CTS [1, 2, 4, 5] and its biassing scheme are shown in figure 1. In the 3D-planar silicon devices the central part is as in the case of the CTS sensors, a planar microstrip detector, while the edge is fabricated using 3D processing [7,8,9]. The sensor is removed from the wafer, again by etching, avoiding the typical surface defects produced by saw cuts In this way the edges become an extension of the back-side n+ electrode [6], as shown schematically in figure 3. The layout of the near-edge region is shown in figure 4
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