Mu3e review at the PSI user meeting
In the context of the annual PSI user meeting, the Mu3e experiment underwent a detailed review by the research committee for particle physics at the ring cyclotron, discussing the preliminary version of the phase I Mu3e technical design report.
Roman Gredig successfully defends Ph.D. thesis on the fibre tracker for Mu3e
Roman Gredig was the first Ph.D. student working on the Mu3e fibre tracker. He has now successfully defended his thesis at the University of Zürich. The thesis is available here.
Mu3e contributions to PIXEL2016
The Mu3e collaboration has presented the latest state of the pixel detector development at the PIXEL2016 conference. The proceedings on the sensor and the mechanics and cooling are now available on the arXiv. You can also find the presentation slides on the talks page.
We spent a week testing our MuPix prototypes and scintillating fibres at PSI with a mixed pion, muon and electron beam. This was followed by a beam time with the high intensity electron beam at MAMI in Mainz. The data obtained will help us to further optimise the sensor performance and check the correct working of the readout architecture even at rates beyond what is expected in the Mu3e experiment. Pictures can be found in the PSI gallery and the MAMI gallery.
The paper describing the track fit especially developed for the Mu3e experiment is available on the arxiv. Taking the multiple Coulomb scattering in the detector material as the dominant uncertainty, we were able do develop a a very fast and robust track fitting algorithm, that now lies at the heart of the Mu3e track reconstruction.
Our paper describing the latest version of our high-voltage monolithic active pixel sensor, the MuPix7, has just appeared on the arxiv. It describes the inner workings of the chip as well as the results of a very intense campaign of beam tests at PSI, DESY in Hamburg, CERN in Geneva and MAMI in Mainz.
Tests of MuPix chips with electron beams as well as tracking algorithms suited for the multiple scattering dominated environment at Mu3e were the topics of Moritz Kiehn's thesis. He successfully defended the thesis at Heidelberg University. The thesis will be available here soon.
First test of pixel sensors with DMA readout and GPU based trackingIn two weeks of test beam time at PSI, for the first time we bring together MuPix7 pixel sensors with fully digital, zero suppressed readout via a high-speed LVDS link with the advanced readout and reconstruction techniques envisioned for Mu3e. The data from the sensors are processed on a FPGA and then transmitted to a graphics processing unit (GPU) for highly parallel track processing. More pictures of the setup can be found in the gallery.
Patrick Eckert successfully defends Ph.D. thesis on the Mu3e tile detectorThe development of the Mu3e tile detector was the main topic of Patrick Eckerts's Ph.D. thesis which he successfully defended at Heidelberg University. With this he is the first Mu3e student to obtain a doctorate, with many more to follow. In the meantime, you can read his thesis in our thesis collection.
Beam test of new Mupix sensorsIn a week of beam tests at DESY in Hamburg, new thin Mupix sensors were tested using 5 GeV electrons and the high precision EUDET telescope. In addition, a beam telescope consisting entierly of Mupix sensors was successfully operated. Results from both setups will give invaluable input into the design of the first centimeter-scale Mupix sensor planned for later this year.
Successful test of the compact beamline for Mu3eThe Mu3e Beam group at PSI succeeded in transporting a hundred million muons per second through the new compact beam line at the PiE5 area right to the point where the Mu3e solenoid will start. The beam phase space looks better than expected from simulations.
Collaboration meeting at ETH ZürichThe Mu3e collaboration met at ETH Zürich to discuss the progress and issues across all parts and subsystems of the experiments.
Thin pixel sensor test beam at PSIFor the first time we are testing a 50 um thin MuPix pixel sensor for efficiency and time resolution. This is made possible by the MuPix beam telescope, also made from thin pixel sensors.
Test Beam at PSIWe are testing prototypes for all three subsystems of Mu3e, the scintillating fibres and tiles as well as the pixel detectors in a week of test beam at PSI.