MuPix7—A fast monolithic HV-CMOS pixel chip for Mu3e

Augustin, Heiko; Berger, N.; Dittmeier, Sebastian; Hammerich, Jan Patrick; Hartenstein, U.; Huang, Qinhua; Huth, Lennart; Immig, D.; Kozlinskiy, A.; Aeschbacher, Frank Meier; Perić, I.; Perrevoort, A.; Schöning, A.; Shrestha, S.; Sorokin, I.; Tyukin, A.; Bruch, Dorothea Vom; Waûters, Frederik; Wiedner, D.; Zimmermann, Marco

doi:10.1088/1748-0221/11/11/c11029

Cited by 17 publications

(21 citation statements)

References 3 publications

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“…Zero suppressed data is sent through one to three serial differential output links at 1.25 Gbit/s. The performance of small MuPix prototypes is described in [4,5]. …”

Section: Mupixmentioning

confidence: 99%

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Readout Electronics for the First Large HV-MAPS Chip for Mu3e

Wiedner¹,

Augustin²,

Berger³

et al. 2018

Proceedings of Topical Workshop on Electronics for Particle Physics — PoS(TWEPP-17)

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Mu3e is an upcoming experiment searching for charged lepton flavour violation in the rare decay µ + → e + e − e + . A silicon pixel tracker based on 50 µm thin High-Voltage Monolithic Active Pixel Sensors in a 1 T magnetic field will deliver precise vertex and momentum information. The MuPix High-Voltage Monolithic Active Pixel Sensor combines pixel sensor cells with integrated analogue electronics and a complete digital readout. For the characterization of the first large MuPix system-on-chip a dedicated readout system was developed. The readout chain and the first results from the characterization of the large scale MuPix8 prototype are presented.

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“…Zero suppressed data is sent through one to three serial differential output links at 1.25 Gbit/s. The performance of small MuPix prototypes is described in [4,5]. …”

Section: Mupixmentioning

confidence: 99%

“…In the last two years, the first prototype with full system-on-chip functionalities was tested successfully [4,5]. This year the first large MuPix prototype with full pixel column length, the MuPix8, is under investigation.…”

Section: Introductionmentioning

confidence: 99%

Readout Electronics for the First Large HV-MAPS Chip for Mu3e

Wiedner¹,

Augustin²,

Berger³

et al. 2018

Proceedings of Topical Workshop on Electronics for Particle Physics — PoS(TWEPP-17)

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“…Consequently, the Mu3e detector components are aimed at minimising the amount of material traversed. High Voltage Monolithic Active Pixels Sensors [4,5] (HV-MAPS) thinned down to 50 μm with a pixel size of 80 × 80 μm 2 placed on ultralight mechanics [6] are used for tracking. In the central part of the detector, two layers of HV-MAPS separated by 6 mm closely surround the hollow double cone target to measure the trajectory's direction for a good vertex reconstruction.…”

Section: Detector Designmentioning

confidence: 99%

Online Data Reduction using Track and Vertex Reconstruction on GPUs for the Mu3e Experiment

Bruch

2017

EPJ Web Conf.

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Abstract.The Mu3e experiment searches for the lepton flavour violating decay μ + → e + e − e + , aiming to achieve a sensitivity of 2 · 10 −15 in its first phase and ultimately aspiring to a final sensitivity of 10 −16 . During the first phase of the experiment, a muon rate of ∼ 10 8 μ/s will be available, resulting in a data rate of ∼ 80 Gbit/s. The trigger-less readout system is based on optical links and switching FPGAs sending the complete detector data for a time slice to one node of the filter farm. A full online reconstruction is necessary to reduce the data rate to a manageable amount to be written to disk. Graphics processing units (GPUs) are used to fit tracks with a non-iterative 3D tracking algorithm for multiple scattering dominated resolution. In addition, a three track vertex selection is performed by calculating the vertex position from the intersections of the tracks. Together with kinematic cuts, this allows for a reduction of the output data rate to below 100 MB/s using 12 DAQ PCs. The Mu3e ExperimentThe Mu3e experiment [1] is designed to search for the lepton flavour violating decay μ + → e + e − e + . In the Standard Model (SM) this process is only allowed via neutrino mixing in loops, and it is heavily suppressed to below a branching fraction of 10 −54 [2]. Therefore any observation of lepton flavour violation in the charged lepton sector is a clear indication for new physics. Various models beyond the SM predict charged lepton flavour violation at a level to which future detectors are sensitive. The current limit on the μ + → e + e − e + branching fraction was set by the SINDRUM experiment at 10 −12 [3]. The Mu3e experiment aims to reach a single event sensitivity of 2 · 10 −15 in a first phase of the experiment with an existing beamline at the Paul Scherrer Institute in Switzerland (PSI), and aspires to a final sensitivity of 10 −16 with an upgraded beamline. This will improve the limit by four orders of magnitude compared to the last experiment. In these proceedings, the focus is on the experimental setup planned for the existing beamline.The detector design is driven by the requirements to distinguish the signal decay from background processes. Within the detector volume, muons will be stopped in a target and decay at rest. In the case of a signal event, two positrons and one electron are coincident in time and originate from one single vertex as shown in figure 1a. The combined energy of the three particles is equal to the rest mass of the muon and their combined momentum is zero. One source of background is radiative muon decay a

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“…Sensor noise is expected at a level of 0.1 Hz per pixel [8] which corresponds to about one noise hit per frame of 50 ns. At noise levels up to 10 Hz per pixel the contribution to the fake rate and the reconstruction efficiency is negligible.…”

Section: Track Reconstructionmentioning

confidence: 99%

Track reconstruction for theMu3eexperiment based on a novel Multiple Scattering fit

Kozlinskiy

2017

EPJ Web Conf.

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Abstract. The Mu3e experiment is designed to search for the lepton flavour violating decay μ + → e + e + e − . The aim of the experiment is to reach a branching ratio sensitivity of 10 −16 . In a first phase the experiment will be performed at an existing beam line at the Paul-Scherrer Institute (Switzerland) providing 10 8 muons per second, which will allow to reach a sensitivity of 2 · 10 −15 . The muons with a momentum of about 28 MeV/c are stopped and decay at rest on a target. The decay products (positrons and electrons) with energies below 53 MeV are measured by a tracking detector consisting of two double layers of 50 μm thin silicon pixel sensors. The high granularity of the pixel detector with a pixel size of 80 μm × 80 μm allows for a precise track reconstruction in the high multiplicity environment of the Mu3e experiment, reaching 100 tracks per reconstruction frame of 50 ns in the final phase of the experiment. To deal with such high rates and combinatorics, the Mu3e track reconstruction uses a novel fit algorithm that in the simplest case takes into account only the multiple scattering, which allows for a fast online tracking on a GPU based filter farm. An implementation of the 3-dimensional multiple scattering fit based on hit triplets is described. The extension of the fit that takes into account energy losses and pixel size is used for offline track reconstruction. The algorithm and performance of the offline track reconstruction based on a full Geant4 simulation of the Mu3e detector are presented.

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MuPix7—A fast monolithic HV-CMOS pixel chip for Mu3e

Cited by 17 publications

References 3 publications

Readout Electronics for the First Large HV-MAPS Chip for Mu3e

Readout Electronics for the First Large HV-MAPS Chip for Mu3e

Online Data Reduction using Track and Vertex Reconstruction on GPUs for the Mu3e Experiment

Track reconstruction for theMu3eexperiment based on a novel Multiple Scattering fit

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