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

• Verfasst von: Berger, Niklaus [VerfasserIn]
• Verfasst von: Herkert, Adrian [VerfasserIn]
• Verfasst von: Huxold, Lukas [VerfasserIn]
• Verfasst von: Schöning, André [VerfasserIn]
• Verfasst von: Wiedner, Dirk [VerfasserIn]
• Verfasst von: Windelband, Bernd [VerfasserIn]
• Titel: The ultra-lightweight support structure and gaseous helium cooling for the Mu3e silicon pixel tracker
• Verf.angabe: N. Berger, A. Herkert, L. Huxold, A. Schöning, D. Wiedner and B. Windelband
• E-Jahr: 2014
• Jahr: August 26, 2014
• Umfang: 9 S.
• Fussnoten: Gesehen am 28.08.2020
• Titel Quelle: Enthalten in: Journal of Instrumentation
• Ort Quelle: London : Inst. of Physics, 2006
• Jahr Quelle: 2014
• Band/Heft Quelle: 9(2014,8) Artikel-Nummer C08023, 9 Seiten
• ISSN Quelle: 1748-0221
• DOI: doi:10.1088/1748-0221/9/08/C08023
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1727947185

Abstract

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.