Speaker
Ms
Dorothea vom Bruch
(Physikalisches Institut, Universitaet Heidelberg)
Description
The Mu3e experiment searches for the lepton flavour violating decay mu->eee,
aiming at a branching ratio sensitivity better than 10^(-16). To reach this
sensitivity, muon rates above 10^9 mu/s are required, which are delivered by the Paul
Scherrer Institute in Switzerland. A high precision tracking detector composed
of ~300 million pixels combined with excellent timing resolution from
scintillating fibers and tiles will measure the momenta, vertices and timing
of the decay products of muons stopped in the target.
The trigger-less readout system will deliver about one Tbit/s of zero-suppressed
data. A network of optical links and switching FPGAs sends the complete
detector data for a time slice to one node of the filter farm. An FPGA
transfers the event data to the GPU via PCIe direct memory access. The GPU
finds and fits tracks using a 3D tracking algorithm for multiple scattering dominated resolution. In a
second step, a three track vertex fit is performed, allowing for a reduction
of the output data rate to below 100 MB/s. The talk discusses the implementation
of the fits on the GPU, which already runs at more than 10^9 track fits/s.
Primary author
Ms
Dorothea vom Bruch
(Physikalisches Institut, Universitaet Heidelberg)
