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primary topic: The Mu3e vertex detector - construction, cooling, and first prototype operation

The Mu3e vertex detector - construction, cooling, and first prototype operation
type: Article
abstract: The Mu3e experiment searches for the charged lepton flavor violating decay µ -> eee with an aimed single event sensitivity of 2*10^-15 in phase I. To achieve this goal, the highest momentum resolution possible is approached, which is mainly affected by multiple Coulomb scattering. This results in extremely tight constraints on the material budget to the level of 0.1 % radiation length per layer for the tracking detector. The Mu3e pixel detector is based on High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) developed for this project, the MuPix, which can be thinned to 50 µm. The electrical services and the support are realized by ultra-thin (around 80 µm) structured aluminum-polyimide laminates. Furthermore, the detector is cooled by gaseous helium, a novelty for particle detectors. This thesis covers the construction of detector mock-ups in preparation for the final production of the Mu3e vertex detector, the studies of the helium cooling system, and the operation of a first functional prototype of the Mu3e vertex detector. The mock-up construction demonstrated that an excellent longitudinal chip placement precision of σ = 4 µm and a lateral precision of σ = 3 µm is achieved with a manual approach. An average glue thickness of only (5.3 ± 1.7) µm for the joint between chips and laminates is realized. The helium cooling system is verified to be sufficient to cool the Mu3e vertex detector. To prove this, the thermal-mechanical mock-ups were heated actively and cooled by the helium cooling system. For a heat dissipation of 350 mW/cm², all chip temperatures are found to be below 70°C for an inlet helium temperature of 0°C. The temperature change during heating up and cooling down can be described by a time constant of about 2 s to 3 s. A first functional vertex detector prototype has been operated under Mu3e-like conditions. The communication with the vertex detector and the readout of its hits is performed by the Mu3e DAQ, which is proven to be functional. The hit…
date: 2022
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: The Mu3e vertex detector - construction, cooling, and first prototype operation (PDF)
has document: The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
subject: 530 Physik

The Mu3e vertex detector - construction, cooling, and first prototype operation (PDF)
type: Document
has file: dissertation_rudzki_thomas_2022.pdf
has part: dissertation_rudzki_thomas_2022.pdf

Thomas Theodor Rudzki
type: Person
given name: Thomas Theodor
family name: Rudzki

The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
type: Document
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The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
type: Document
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The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
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The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
type: Document
is version of: The Mu3e vertex detector - construction, cooling, and first prototype operation (PDF)
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The Mu3e vertex detector - construction, cooling, and first prototype operation (Other)
type: Document
is version of: The Mu3e vertex detector - construction, cooling, and first prototype operation (PDF)
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primary topic: The Mu3e vertex detector - construction, cooling, and first prototype operation

530 Physik
type: Concept
preferred label: 530 Physics @en