from 24 February 2014 to 1 March 2014
Asia/Novosibirsk timezone
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Contribution Oral presentation


The Ultra Lightweight Support Structure and Gaseous Helium Cooling for the Mu3e Silicon Pixel Tracker


  • Dirk WIEDNER

Primary authors

  • Dirk WIEDNER (Physikalisches Institut der Universitaet Heidelberg)

Abstract content

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 (HVMAPS) with a timing system which consists of a scintillating fiber detector and a tile hodoscope. As the momentum of particles from muon decay 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 HVMAPS 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. In this presentation the ultra-lightweight support structure and the gaseous helium cooling system for the thin silicon pixel tracker will be discussed.