Status and prospects of the LHCb vertex locator

Beuzekom, M.G. van

doi:10.1016/j.nima.2008.07.140

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…The cooling system for the Belle II VXD is based on the 2-Phase Accumulator controlled Loop (2PACL) method [7,8], which has been originally developed for the thermal control system of the AMS tracker [9], and was later implemented also in the LHCb experiment for the cooling of the VErtex LOcator (VELO) [10].…”

Section: Mechanical Layout and Cooling Concept Of Pxdmentioning

confidence: 99%

Thermal Mockup Studies of Belle $$\text {II}$$ Vertex Detector

Ye¹,

Niebuhr²

2018

Springer Proceedings in Physics

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The Belle II experiment currently under construction at the e + e − -collider SuperKEKB in Japan is designed to explore new physics beyond the standard model with an approximately 50 times larger data sample compared to its predecessor. The vertex detector (VXD), comprising a two layer DEPFET pixel detector (PXD) surrounded by four layers of double sided silicon strip detector (SVD), is indispensable for the accurate determination of the decay point of B or D meson as well as track reconstruction of low momentum particles. The DEPFET sensors in Belle II are thinned down to 75 µm with low power consumption and low intrinsic noise. In the DEPFET concept, the front-end electronics is placed outside of the sensitive area, and thus no cooling components are necessary inside the physics acceptance of the detector. Evaporative two-phase CO 2 cooling in combination with forced air flow has been chosen as the scheme for the PXD cooling. To guarantee the DEPFET detector operation condition and verify the cooling concept, a PXD mockup is constructed at DESY. Studies of the thermal and mechanical performance are presented in this paper.

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Section: Mechanical Layout and Cooling Concept Of Pxdmentioning

confidence: 99%

Thermal Mockup Studies of Belle $$\text {II}$$ Vertex Detector

Ye¹,

Niebuhr²

2018

Springer Proceedings in Physics

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“…The VErtex LOcator [2] is the silicon detector surrounding the LHCb interaction point. It is located only 7 mm from the beam axis during normal operation and measures very precisely the primary vertex and the decay vertices.…”

Section: The Vertex Locator (Velo)mentioning

confidence: 99%

The LHCb VELO upgrade

Pérez

2013

Nuclear Instruments and Methods in Physics Research Section A:

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LHCb is a forward spectrometer experiment dedicated to the study of new physics in the decays of beauty and charm hadrons produced in proton collisions at the Large Hadron Collider (LHC) at CERN.The VErtex LOcator (VELO) is the microstrip silicon detector surrounding the interaction point, providing tracking and vertexing measurements. The upgrade of the LHCb experiment, planned for 2018, will increase the luminosity up to 2 × 10 33 cm −2 s −1 and will perform the readout as a trigger-less system with an event rate of 40 MHz. Extremely non-uniform radiation doses will reach up to 5 × 10 15 1 MeVn eq /cm 2 in the innermost regions of the VELO sensors, and the output data bandwidth will be increased by a factor of 40. An upgraded detector is under development based in a pixel sensor of the Timepix/Medipix family, with 55 x 55 µm 2 pixels. In addition a microstrip solution with finer pitch, higher granularity and thinner than the current detector is being developed in parallel.The current status of the VELO upgrade program will be described together with recent testbeam results. teractions per bunch crossing ( Fig. 1(a)

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“…Furthermore, they have to cope with the increased radiation environment (a factor 10) which goes beyond the current design. The baseline choice for the replacement of the present vertex detector (Vertex Locator, VELO [4]) is a pixel based device [2,5], based on an evolution of the Timepix/Medipix family of chips [6]. This consists of a 256×256 array of square pixels, which brings advantages in the pattern recognition in comparison to the R and φ strip geometry used in the current VELO with the absence of fake combinatorial hits.…”

Section: The Vertex Detector Upgradementioning

confidence: 99%

LHCb Upgrade: from 1 to 40 MHz

Torreira¹

2012

Proceedings of the 20th Anniversary International Workshop on Vertex Detectors — PoS(Vertex 2011)

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The fully upgraded detector will use a new front-end electronics to readout collision events at 40MHz. A new fully software based trigger will be implemented and will increase the trigger efficiencies, specially in the hadronic decay channels. The silicon vertex detector baseline design will use pixel technology. The upgraded detector will accumulate in excess of 50fb −1 of data, giving radiation doses of 4 × 10 15 n eq and above at the edge of the silicon. This requires an efficient cooling system to avoid thermal runaway. The existing cooling system based on evaporative CO 2 will be adapted. A strong R&D program has started on sensor material and radiation hardness, thickness, guard ring structures and the final module layout. In parallel the design of a new radiation hard ASIC for pixel readout, namely VELOpix, is progressing well. The main challenge will be the large multi Gbps data rates on and off this chip. In terms of precision, pattern recognition and impact parameter resolution, the goal is to achieve the same or better performance than the current vertex detector at the LHCb experiment.

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Status and prospects of the LHCb vertex locator

Cited by 14 publications

References 6 publications

Thermal Mockup Studies of Belle $$\text {II}$$ Vertex Detector

Thermal Mockup Studies of Belle $$\text {II}$$ Vertex Detector

The LHCb VELO upgrade

LHCb Upgrade: from 1 to 40 MHz

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