N4D2  High Energy and Nuclear Physics Instrumentation 4

Thursday, Nov. 5  16:30-18:10  San Diego

Session Chair:  Miguel Ullan, Centro Nacional de Microelectronica (CNM-CSIC), Spain; Georg Steinbrueck, University of Hamburg, Germany

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(16:30) N4D2-1, Performance of Edgeless Silicon Pixel Sensors on P-Type Substrate for the ATLAS High-Luminosity Upgrade

M. Bomben1,2, A. Bagolini3, M. Boscardin3, L. Bosisio4, G. Calderini1,5, J. Chauveau1,6, A. Ducourthial1, G. Giacomini3, G. Marchiori1, N. Zorzi3

1Laboratoire de Physique Nucleaire et de Hautes Énergies (LPNHE), Paris, France
2UFR de Physique, Université Paris Diderot, Paris, France
3Fondazione Bruno Kessler, Centro per i Materiali e i Microsistemi (FBK-CMM), Povo di Trento (TN), Italy
4Università di Trieste, Dipartimento di Fisica and INFN, Trieste, Italy
5Dipartimento di Fisica E. Fermi, Università di Pisa, and INFN Sez. di Pisa, Pisa, Italy
6UFR de Physique, Université Pierre et Marie Curie, Paris, France
In view of the LHC upgrade phases towards the High Luminosity LHC (HL-LHC), the ATLAS experiment plans to upgrade the Inner Detector with an all-silicon system. The n-on-p silicon technology is a promising candidate to achieve a large area instrumented with pixel sensors, since it is radiation hard and cost effectiveness. The paper reports on the performance of novel n-in-p edgeless planar pixel sensors produced by FBK-CMM, making use of the active trench for the reduction of the dead area at the periphery of the device. After discussing the sensor technology an overview of the first testbeam results of the produced devices will be given.

(16:50) N4D2-2, The CPIX Demonstrator Modules

P. Pangaud

CPPM/IN2P3/CNRS - AIX MARSEILLE UNIVERSITY, MARSEILLE, FRANCE

On behalf of the ATLAS Collaboration
To face the new challenges brought by the upgrades of the Large Hadron Collider at CERN by the year 2023, the planned increase towards High Luminosity with peak luminosities of up to 1035.cm-2.s-1 requires a fundamental redesign of the complete ATLAS inner detector (ITK), due to both increased radiation levels and increased occupancy in the sub-detectors. One solution for hybrid pixel replacement is to use industrial CMOS foundries offering High Voltage (HV) design option and even in some cases the possibility of High Resistivity (HR) substrate, allowing the creation of a deep depletion zone, suitable for particle detection with active pixel detectors. These technologies offer in-pixel fast signal processing solutions, reduce the pixel cluster sizes and are potentially cheaper than the today's hybrid approaches. Studies concerning radiation tolerance are also very encouraging. The current ATLAS R&D program, called CPIX demonstrator, aims to prove the feasibility of HV/HR-CMOS detector as an option for parts of the pixel detector in the ATLAS ITK Technical Design Report in 2017 and last experimental results in several processes will be reviewed and presented.

(17:10) N4D2-3, A High Resolution Timing Counter for the MEG II Experiment

M. Simonetta

INFN Pavia, Pavia, Italy

On behalf of the MEGII Timing counter group
The development of a Timing Counter detector with a resolution ~30ps will be presented. The detector was designed for the upgrade of the MEG II experiment looking for the mu->e gamma decay with an improved sensitivity of ~ one order of magnitude with respect to the previous MEG setup. The detector is based on two sets of scintillation pixels arranged in a semi-cylindrical structure; each sub-detector consists of 256 counters. The individual pixel is based on a 120x50x5mm3 plate of ultra fast scintillator with double-side read-out by arrays of 6 Silicon PhotoMultipliers (SiPM) connected in series. The pixelated structure design results in two advantages: - the small pixel size allow to achieve optimal resolution (~75ps) for the single module, minimizing uncertainties in the positron path length as well as in the scintillation light arrival time to SiPMs; - a positron crosses more than one pixel (mean number from MC simulation is ~9). Thus, the overall resolution is improved by a proper averaging of the times measured by hit pixels. The design of the single pixel has been extensively studied with laboratory tests using electrons from a Sr 90 radioactive source, comparing different scintillators, counter dimensions, and types of near-UV sensitive SiPMs, to find the best devices and materials to be used. Prototypes with a small (~10) number of pixels have been built and tested both in BTF (Frascati, IT) and PSI (Villigen, CH) beam facilities to prove the multiple hit scheme under MEG-like beam conditions. A resolution of ~35ps with 8 pixels hit has been demonstrated with Michel positrons beam @50-150 kHz. The R&D phase is currently finished being all the detector elements well defined. The pixels mass production and the mechanical structure construction are on-going. The first sub-detector will be completed in few months from now, and it will be tested in the MEG II pre-engineering run planned at the end of 2015.}

(17:30) N4D2-4, Beam Conditions Monitors and Luminometers of CMS for Run II

K. Rose

University of Tennessee, Tennessee, USA

On behalf of the CMS Collaboration
The beam conditions monitors and luminometers of the CMS experiment were enhanced by several new and upgraded sub-detectors to match the challenges of the LHC operation and physics program at increased energy and higher luminosity. Several novel detector technologies were used. A pixel luminosity telescope (PLT) using silicon pixel sensors supplemented with a fast internal trigger is used for a fast and precise luminosity measurement. The fast beam-conditions monitor (BCM) was upgraded measuring the particle flux using 24 single crystal diamond sensors. Each sensor is subdivided in two pads, each read out by a dedicated radiation hard and fast front-end ASIC produced in 130 nm CMOS technology. The excellent time resolution is used to separate collision products from machine induced background, allowing such both to monitor the machine induced background near the beam-pipe and an independent on-line luminosity measurement. A third sub-detector using polycrystalline diamond sensors and a few prototype sapphire sensors, is installed to protect the experiment from adverse beam conditions and induce a beam abort in case of severe beam losses. A beam-halo monitor (BHM) at larger radius uses Cerenkov light produced by relativistic charged particles in quartz bars to provide direction sensitivity and excellent time resolution to separate incoming and outgoing particles. Finally, as part of the forward HCAL (HF) used for the luminosity measurements, the system is upgraded with new multichannel PMTs. The back-end electronics includes dedicated modules with high bandwidth digitizers developed in both VME and microTCA standards for per bunch beam measurements and gain monitoring. All new and upgraded sub-detectors were taking data from the first day of LHC operation in April 2015. Results on their essential characteristics using data since the start-up of LHC will be presented. The presenter of the talk will be decided later, following the rules of the collaboration

(17:50) N4D2-5, Performance of the CMS Beam Halo Monitor

N. Tosi

Sezione INFN ed Universita' di Bologna, Bologna, Italy

On behalf of the CMS Collaboration
The CMS Beam Halo Monitor has been successfully installed in the CMS cavern in LHC Long Shutdown 1 for measuring the machine induced background for LHC Run II. The system is based on 40 detector units composed of radiation hard synthetic quartz Cherenkov radiators coupled to fast photomultiplier tubes for a direction sensitive measurement. The readout electronics chain uses many components developed for the Phase 1 upgrade to the CMS Hadronic Calorimeter electronics, with dedicated firmware and readout adapted to the beam monitoring requirements. The PMT signal is digitized by a charge integrating ASIC (QIE10), providing both the signal rise time, with few ns resolution, and the charge integrated over one bunch crossing. The backend electronics uses microTCA technology and received data via a high-speed 5 Gbps asynchronous link. It records histograms with sub-bunch crossing timing resolution and is readout by IPbus using the newly designed CMS data acquisition for non-event based data. The data is processed in real time and published to CMS and the LHC, providing online feedback on the beam quality. A dedicated calibration monitoring system has been designed to generate short triggered pulses of light to monitor the efficiency of the system. The electronics has been in operation since the first LHC beams of Run II and has served as the first demonstration of the new QIE10, Igloo2 and high-speed 5 Gbps with LHC data. This contribution presents the Beam Halo Monitor and the performance of the detector thus far in Run II.

(17:10) N1D2-3, Beam Test Results on the Detection of Single Particles and Electromagnetic Showers with Microchannel Plates

A. Martelli1,2, A. Barnyakov3,4, M. Barnyakov3,4, L. Brianza2, F. Cavallari5, D. D. Re5, S. Gelli5, A. Ghezzi2, C. Gotti2, P. Govoni2, C. J. Lope5, B. Marzocchi2, P. Meridiani5, G. Organtini5, R. Paramatti5, L. Pernie5, S. Pigazzini2, S. Rahatlou5, C. Rovelli5, F. Santanastasio5, T. Tabarelli de Fatis2, N. Trevisani2

1CERN, Geneve, Suisse
2Universita` di Milano Bicocca and INFN, Milano, Italy
3Budker Institute of Nuclear Physics, Novosibirsk, Russia
4Novosibirsk State University, Novosibirsk, Russia
5Universita` di Roma “La Sapienza” and INFN, Roma, Italy
IMCP is an R\&D project aimed at the exploitation of secondary emission of electrons from the surface of micro-channel plates (MCP) for fast timing of showers in high rate environments. The usage of MCPs in ``ionisation'' mode has long been proposed and is used extensively in ion time-of-flight mass spectrometers. What has not been investigated in depth is their use to detect the ionizing component of showers. The fast time resolution of MCPs exceeds anything that has been previously used in calorimeters and, if exploited effectively, could aid in the event reconstruction at high luminosity colliders. Results from tests with electrons with energies up to 150 GeV of MCP devices with different characteristics will be presented, in particular detection efficiency and time resolution.