The ultra-lightweight support structure and gaseous helium cooling for the Mu3e silicon pixel tracker

The Mu3e experiment searches for charged lepton flavor violation in the rare decay μ→eee. In order to reach a sensitivity of better than 10−16, more than 109 muon decays per second have to be observed over a running time of one year. Precise determination of particle momentum, vertex position and ti...

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Hauptverfasser: Berger, Niklaus (VerfasserIn) , Herkert, Adrian (VerfasserIn) , Huxold, Lukas (VerfasserIn) , Schöning, André (VerfasserIn) , Wiedner, Dirk (VerfasserIn) , Windelband, Bernd (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: August 26, 2014
In: Journal of Instrumentation
Year: 2014, Jahrgang: 9, Heft: 08
ISSN:1748-0221
DOI:10.1088/1748-0221/9/08/C08023
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1748-0221/9/08/C08023
Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.1088/1748-0221/9/08/C08023
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Verfasserangaben:N. Berger, A. Herkert, L. Huxold, A. Schöning, D. Wiedner and B. Windelband

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520 |a The Mu3e experiment searches for charged lepton flavor violation in the rare decay μ→eee. In order to reach a sensitivity of better than 10−16, more than 109 muon decays per second have to be observed over a running time of one year. Precise determination of particle momentum, vertex position and time are necessary for background suppression. These requirements can be met by combining an ultra-lightweight tracker based on High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) with a timing system which consists of a scintillating fiber detector and a tile hodoscope. As the momentum of particles from muon decay at rest is below 53 MeV/c, the silicon pixel tracker resolution is dominated by multiple Coulomb scattering. This leads to extreme requirements for the material budget of the tracking detector of below 0.1% of a radiation length per layer. Even though the target power consumption of the HV-MAPS detector is as low as 150 mW/cm2, the detector cooling must be very efficient and at the same time avoid adding material inside the active tracking volume. 
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