Search

The next generation of vertexing detectors in collider experiments will require order of magnitude increases in readout speed and increased background rates. The CAP12 continues the evolution of a number of binary, 3T based pixel detector related technologies at the University of Hawaii (UH) to address readout speed, density requirements, and background rate issues. The CAP12 takes the HIXEL (Hexagonal Pixels) readout method developed at UH and combines it with faster digital logic, column based threshold biasing, and manufactured on a 0.2 μm SOI CMOS technology. Pixel size has been reduced to 30 μm by 30 μm and on die threshold DACs are intended to improve analog performance and biasing. The chip architecture is presented as well as simulations and preliminary results.

9th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors, HSTD-9 2013, Hiroshima, Japan, 2 Sep 2013 - 5 Sep 2013 ; Nuclear instruments & methods in physics research / A 765, 125 - 129(2014). doi:10.1016/j.nima.2014.05.092, Various structures for n-in-p planar pixel sensors have been developed at KEK in order to cope with the huge particle fluence in the upcoming LHC upgrades. Performances of the sensors with different structures have been evaluated with testbeam. The n-in-p devices were connected by bump-bonding to the ATLAS Pixel front-end chip (FE-I4A) and characterized before and after the irradiation to 1×10 16 1 MeV neq/cm2 . Results of measurements with 120 GeV/c momentum pion beam at the CERN Super Proton Synchrotron (SPS) in September 2012 are presented., Published by North-Holland Publ. Co., Amsterdam

The silicon pixel detector is the innermost component of the CMS tracking system and plays a crucial role in the all-silicon CMS tracker. While the current pixel tracker is designed for and performing well at an instantaneous luminosity of up to 1 × 10 34 cm − 2 s − 1 , it can no longer be operated efficiently at significantly higher values. Based on the strong performance of the LHC accelerator, it is anticipated that peak luminosities of two times the design luminosity are likely to be reached before 2018 and perhaps significantly exceeded in the running period until 2022, referred to as LHC Run 3. Therefore, an upgraded pixel detector, referred to as the phase 1 upgrade, is planned for the year-end technical stop in 2016. With a new pixel readout chip (ROC), an additional fourth layer, two additional endcap disks, and a significantly reduced material budget the upgraded pixel detector will be able to sustain the efficiency of the pixel tracker at the increased requirements imposed by high luminosities and pile-up. The main new features of the upgraded pixel detector will be an ultra-light mechanical design, a digital readout chip with higher rate capability and a new cooling system. These and other design improvements, along with results of Monte Carlo simulation studies for the expected performance of the new pixel detector, will be discussed and compared to those of the current CMS detector.

The Compact Muon Solenoid (CMS) detector is one of two general-purpose detectors that reconstruct the products of high energy particle interactions at the Large Hadron Collider (LHC) at CERN. The silicon pixel detector is the innermost component of the CMS tracking system. It determines the trajectories of charged particles originating from the interaction region in three points with high resolution enabling precise momentum and impact parameter measurements in the tracker. The pixel detector is exposed to intense ionizing radiation generated by particle collisions in the LHC. This irradiation could result in temporary or permanent malfunctions of the sensors and could decrease the efficiency of the detector. We have developed procedures in order to correct for these effects. In this paper, we present the types of malfunctions and the offline calibration procedures. We will also show the efficiency and the resolution of the detector in 2012., Presented at ICHEP 2014, accepted for publication in Nuclear Physics B Proceedings Supplements

Reliable sample delivery and efficient use of limited beam time have remained bottlenecks for serial crystallography (SX). Using a high-intensity polychromatic X-ray beam in combination with a newly developed charge-integrating JUNGFRAU detector, we have applied the method of fixed-target SX to collect data at a rate of 1 kHz at a synchrotron-radiation facility. According to our data analysis for the given experimental conditions, only about 3 000 diffraction patterns are required for a high-quality diffraction dataset. With indexing rates of up to 25%, recording of such a dataset takes less than 30 s.

Firsts results on particle detection using a novel silicon pixel detector are presented. The sensor consists of an array of 48 square pixels with 380 μm pitch based on a n-i-p hydrogenated amorphous silicon (a-Si:H) film deposited on top of a VLSI chip. The deposition was performed by VHF-PECVD, which enables high rate deposition up to 2 nm/s. Direct particle detection using beta particles from 63Ni and 90Sr sources was performed. © 2004 Elsevier B.V. All rights reserved.

International audience; This work discusses the design and the main results relevant to the characterization of analogfront-end processors in view of their operation in the pixel detector readout chips of ATLAS andCMS at the High-Luminosity LHC. The front-end channels presented in this paper are part ofRD53A, a large scale demonstrator designed in a 65 nm CMOS technology by the RD53 collaboration. The collaboration is now developing the full-sized readout chips for the actual experiments. Some details on the improvements implemented in the analog front-ends are provided inthe paper.

Synchrotron radiation has emerged over more than one-half century as a gigantic worldwide enterprise involving tens of thousands of researchers. Its history has been continuously and strongly linked to the technical progress of sensors. We review here different aspects of this symbiotic relation, for photon sensors and other devices. We also analyze its probable future developments, specifically in light of the new x-ray free electron lasers.

The Gigatracker is a hybrid silicon pixel detector developed to track the highly intense NA62 hadron beam with a time resolution of 150 ps (rms). The beam spectrometer of the experiment is composed of three Gigatracker stations installed in vacuum in order to precisely measure momentum, time and direction of every traversing particle. Precise tracking demands a very low mass of the detector assembly (o0:5% X0 per station) in order to limit multiple scattering and beam hadronic interactions. The high rate and especially the high timing precision requirements are very demanding: two R&D options are ongoing and the corresponding prototype read-out chips have been recently designed and produced in 0:13 mm CMOS technology. One solution makes use of a constant fraction discriminator and on-pixel analogue-based time-to-digital-converter (TDC); the other comprises a delay-locked loop based TDC placed at the end of each pixel column and a time-over-threshold discriminator with time- walk correction technique. The current status of the R&D program is overviewed and results from the prototype read-out chips test are presented.

A new, 8/spl times/8-element pixel detector array for time resolved protein crystallography has been developed at the Lawrence Berkeley National Laboratory (LBNL). Each element has its own on-chip charge sensitive preamplifier and shaper with a peaking time of 100 ns. A total of 64 parallel analog to digital processing channels are required to support the detector. We describe a low-cost, low-power AD processing system, comprising a fast peak-sensing amplifier/stretcher, followed by a slower 12-bit ADC. Each channel also includes a histogramming memory for a fully stand-alone operation of the system. Circuit performance and test data are also presented.

The high resolution silicon Pixel detector is critical in event vertex reconstruction and in particle track reconstruction in the ATLAS detector. During the pixel data taking operation, some modules (Silicon Pixel sensor +Front End Chip+ Module Control Chip (MCC)) go to an auto-disable state, where the Modules don’t send the data for storage. Modules become operational again after reconfiguration. The source of the problem is not fully understood. One possible source of the problem is traced to the occurrence of single event upset (SEU) in the MCC. Such a module goes to either a Timeout or Busy state. This report is the study of different types and rates of errors occurring in the Pixel data taking operation. Also, the study includes the error rate dependency on Pixel detector geometry.

The CMS pixel detector constitutes the inner core of the tracking system. It is designed to provide three high-precision hits at least per track up to an acceptance in eta of ± 2.5. Together with the ATLAS and ALICE pixel detectors, it represents one of the biggest pixel systems ever built by our community. It consists of about 66 millions pixel cells, 150 × 100 ¿m2 area, distributed over three concentric barrel cylinders (48 millions) and four end-cap disks, two on each end of the barrel. In this talk, I will describe the main features of the system, the project requirements and the performance measured in several tests both on bench and beam, with particular emphasis on the expected radiation tolerance. I will then discuss the present status of the detector and the schedule for the installation. I will conclude with some considerations in view of the changes needed for SLHC.

Miniaturized computational spectrometers, which can obtain incident spectra using a combination of device spectral response and reconstruction algorithms, are essential for on-chip and implantable applications. Highly sensitive spectral measurement using a single detector allows the footprints of such spectrometers to be scaled down while achieving spectral resolution approaching that of benchtop systems. We report a high-performance computational spectrometer based on a single van der Waals junction with an electrically tunable transport-mediated spectral response. We achieve high peak wavelength accuracy (~0.36 nanometers), high spectral resolution (~3 nanometers), broad operation bandwidth (from ~405 to 845 nanometers), and proof-of-concept spectral imaging. Our approach provides a route toward ultraminiaturization and offers unprecedented performance in accuracy, resolution, and operation bandwidth for single-detector computational spectrometers., EP/T014601/1