Position resolution and efficiency measurements with large scale Thin Gap Chambers for the super LHC

New developments in Thin Gap Chambers (TGC) detectors to provide fast trigger and high precision muon tracking under sLHC conditions are presented. The modified detectors are shown to stand a high total irradiation dose equivalent to 6 Coulomb/cm of wire, without showing any deterioration in their performance. Two large (1.2 x 0.8 m^2) prototypes containing four gaps, each gap providing pad, strips and wires readout, with a total thickness of 50 mm, have been constructed. Their local spatial resolution has been measured in a 100 GeV/c muon test beam at CERN. At perpendicular incidence angle, single gap position resolution better than 60 microns has been obtained. For incidence angle of 20 degrees resolution of less than 100 micron was achieved. TGC prototypes were also tested under a flux of 10^5 Hz/cm^2 of 5.5-6.5 MeV neutrons, showing a high efficiency for cosmic muons detection.Comment: Presented at the 12 Vienna conference on Instrumentation, February 201

J/ψ spin-alignment measurement in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC

The J/ψ and Υ mesons were discovered about forty years ago. Since then, the study of qq bound states provide significant input for the understanding of quantum chromodynamics (QCD). Although the J/ψ is one of the simplest systems in QCD, it is difficult to describe in detail its production mechanism. A measurement of the J/ψ spin-alignment could shed light on our understanding, and help to distinguish between the different proposed theoretical models. A precise measurement of the spin-alignment of J/ψs decaying into two muons in pp collisions at a centre of mass energy of √s = 8 TeV at the LHC is presented. This is the first measurement of this quantity at this energy regime. The current study is based on integrated luminosity of 14/fb of data collected by the ATLAS experiment in 2012. As an input for this analysis, a measurement of the production ratio of prompt to non-prompt J/ψ was done. From this measurement we extract the fractions of three physical processes in our signal region, the fraction of prompt J/ψs, non-prompt J/ψs (coming from B-decays) and non-J/ψ background. It was found that the fraction of prompt J/ψs decreases with the increase of pT, where at low pT it starts from 60% and decreases to 30% in the highest pT. The fraction of the non-prompt J/ψ has the opposite behaviour, and the background is below 20% over the whole region. The measurement of the prompt J/ψ spin-alignment was preformed in the two dimensional angular distribution (cosθ∗ and φ∗) in bins of pT and rapidity of the J/ψ. All three spin-alignment parameters, λθ∗ , λφ∗ and λθ∗φ∗ where measured. The λθ∗ was found to be consistent with zero (with respect to the total uncertainties) in the low pT region, and positive (≈ 0.2) with the increase of J/ψ pT. The other two parameters λφ∗ and λθ ∗φ∗ were found to be very small, with small uncertainties, where the λφ∗ slightly increases with pT, and λθ∗φ∗ is consistent with zero in most of the pT spectrum. The last part of this thesis describes the development of the small Thin Gap Chambers (sTGC) for the Phase-I ATLAS upgrade. It was developed and proposed to replace the small wheel of the ATLAS detector. This technology is based on the TGCs that are operated today in the ATLAS Muon Spectrometer and are used for triggering on high pT muons in the ATLAS endcaps region. The new detector design was approved by the collaboration this year. This new detectors design will allow to maintain the full trigger acceptance and precise muon tracking at the highest LHC luminosities expected after the LHC upgrades

Comissioning of the EndoTOFPET-US detector An Asymmetric Time of Flight Positron Emission Tomograph

Within the framework of the EndoTOFPET-US project an endoscopic multimodal imaging device combining Ultrasound endoscopy and Time-of-Flight Positron Emission Tomography is developed. The design foresees a miniaturized PET head installed on a commercial ultrasound endoscope and an external detector plate, which will be positioned in close proximity to the patient's body. The prototype system described here consists of the final PET plate and an endoscopic demonstrator, which has a coincidence time resolution of 254 ps FWHM and reaches a spatial resolution of about 1.8 mm in the direction transverse to the line of sight connecting the detectors.The applications of this device are within diagnostic and surgical oncology as well as the development of new biomarkers targeted for prostate cancer. In this talk the results of the commissioning of a full sized prototype of the detector and of the first image reconstruction are presented

Commissioning and first image reconstruction with a new time-of-flight PET prototype

Within the framework of the EndoTOFPET-US project an endoscopic multimodal imaging device combining Ultrasound endoscopy and Time-of-Flight Positron Emission Tomography is developed. The design foresees a miniaturized PET head installed on a commercial ultrasound endoscope and an external detector plate, which will be positioned in close proximity to the patient's body. The prototype system described here consists of the final PET plate and an endoscopic demonstrator, which has a system time of flight resolution of 255 ps FWHM and reaches a spatial resolution of about 1.5 mm in the direction transverse to the line of sight connecting the detectors. The applications of this device are within diagnostic and surgical oncology as well as the development of new biomarkers targeted for prostate cancer. In this paper, results from the commissioning of a full sized prototype, including timing performance and first image reconstruction are presented

Commissioning of an asymmetric TOF-PET system

Im Rahmen des EndoTOFPET-US-Projekts wird ein neuartiges multi-modales Gerät zur Ultraschall-Endoskopie und Positronen-Emissions-Tomographie (PET) von Prostata- und Pankreas-Karzinomen entwickelt. Das Gerät besteht aus einem miniaturisierten PET-Kopf, installiert auf einem komerziellen Ultraschall-Endoskop und einer externen Detektor-Platte, die in unmittelbarer Nähe zum Körper positioniert wird. Dieses nutzt die Flugzeit (TOF)-Information der detektierten Photonen, um Untergrund von naheliegenden Organen zuunterdrücken. Dazu wird eine Koinzidenz-Zeitauflösung von Durchschnittlich 250 ps Halbwertsbreite erreicht. Die Detektion der Photonen erfolgt mittels Szintillationskristallen, ausgelesen durch Silizium-Photomultiplier (SiPM). Die Verarbeitung der SiPM-Signale erfolgt durch den STiC-Chip (SiPM Timing Chip, Uni Heidelberg). Um das System zu vervollständigen wird zu der bereits bestehenden äußeren Platte ein PET-Kopf mit 64 Pixeln und einer Pixelgröße von 1x1 mm$^2$hergestellt und charakterisiert. Weiterhin wird der Einfluss der Zeitauflösung und der Asymmetrie der Pixelgrössen auf Signal- zu Rauschverhältnis sowie aufdie räumliche Auflösung des Systems untersucht

The Mu3e Data Acquisition

International audienceThe Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10$^8$ muons per second are available. The detector will consist of an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements. The experiment produces about 100 Gbit/s of zero-suppressed data which are transported to a filter farm using a network of FPGAs and fast optical links. On the filter farm, tracks and three-particle vertices are reconstructed using highly parallel algorithms running on graphics processing units, leading to a reduction of the data to 100 Mbyte/s for mass storage and offline analysis. The paper introduces the system design and hardware implementation of the Mu3e data acquisition and filter farm

International Large Detector: Interim Design Report

The ILD detector is proposed for an electron-positron collider with collision centre-of-mass energies from 90~\GeV~to about 1~\TeV. It has been developed over the last 10 years by an international team of scientists with the goal to design and eventually propose a fully integrated detector, primarily for the International Linear Collider, ILC. In this report the fundamental ideas and concepts behind the ILD detector are discussed and the technologies needed for the realisation of the detector are reviewed. The document starts with a short review of the science goals of the ILC, and how the goals can be achieved today with the detector technologies at hand. After a discussion of the ILC and the environment in which the experiment will take place, the detector is described in more detail, including the status of the development of the technologies foreseen for each subdetector. The integration of the different sub-systems into an integrated detector is discussed, as is the interface between the detector and the collider. This is followed by a concise summary of the benchmarking which has been performed in order to find an optimal balance between performance and cost. To the end the costing methodology used by ILD is presented, and an updated cost estimate for the detector is presented. The report closes with a summary of the current status and of planned future actions

The ILD detector at the ILC

The International Large Detector, ILD, is a detector concept which has been developed for the electron-positron collider ILC. The detector has been optimized for precision physics in a range of energies between 90 GeV and 1 TeV. ILD features a high precision, large volume combined silicon and gaseous tracking system, together with a high granularity calorimeter, all inside a 3.5 T solenoidal magnetic field. The paradigm of particle flow has been the guiding principle of the design of ILD. In this document the required performance of the detector, the proposed implementation and the readiness of the different technologies needed for the implementation are discussed. This is done in the framework of the ILC collider proposal, now under consideration in Japan, and includes site specific aspects needed to build and operate the detector at the proposed ILC site in Japan

Search for Scalar Diphoton Resonances in the Mass Range 65−60065-600 GeV with the ATLAS Detector in pppp Collision Data at s\sqrt{s} = 8 TeVTeV

A search for scalar particles decaying via narrow resonances into two photons in the mass range 65–600 GeV is performed using $20.3\text{}\text{}{\mathrm{fb}}^{-1}$ of $\sqrt{s}=8\text{}\text{}\mathrm{TeV}$ $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as limits at the 95% confidence level on the production cross section of a scalar boson times branching ratio into two photons, in a fiducial volume where the reconstruction efficiency is approximately independent of the event topology. The upper limits set extend over a considerably wider mass range than previous searches