R&D for the Vertexing at CLIC

Abstract

The Compact Linear Collider is a candidate to be the next high-energy particle physics collider. Using a novel acceleration technique, electrons and positrons would be brought into collision with a centre-of-mass energy of up to 3 TeV. Despite challenging levels of beam-induced background, this would provide a relatively clean environment in which to perform precision physics measurements. The vertex detector would be crucial in achieving this, and would need to provide accurate particle tracking information to facilitate secondary vertex reconstruction and jet flavour-tagging. With this goal in mind, current technological limits are being stretched to design a low occupancy, low mass and low-power dissipation vertex detector for CLIC. A concept comprising thin hybrid pixel detectors coupled to high-performance readout ASICs, power-pulsing and air-flow cooling is under development. In this paper, the CLIC vertex detector requirements are reviewed and the current status of R&D on sensors, readout, powering, cooling and supports is presented.

The CLIC Vertex Detector

“…Slim-edge sensor designs (250-450 µm, two guard rings) are compared to designs with active edges (20-50 µm, one guard ring above the edge pixels). Preliminary beam-test results show very good efficiencies in both cases, extending beyond the edge pixels [12]. For 50 µm sensor thickness and nominal readout parameters, the fraction of multi-pixel clusters is approximately 20%.…”

Status of vertex and tracking detector R&D at CLIC

“…Test-beam measurements were performed on the assemblies at DESY and at the CERN PS [3]. In both places, the EUDET telescope [4], based on MIMOSA detectors, was used to provide track information with a position resolution at the Device Under Test (DUT) of ~ 3 μm.…”