86,699 research outputs found
Towards minimum material trackers for high energy physics experiments at upgraded luminosities
No full textReducing material in silicon trackers is of major importance for a good detector performance overall, and poses a big challenge in the development of the detectors. To match the low material desirable for trackers in High Energy Physics experiments at upgraded luminosities, special techniques have to be developed to address the main sources of material, i.e. mechanical structure and services, and to prevent new significant contributions to the detector material coming for instance from larger Front-End chips. In this framework three methods are developed to reduce the material added by services and electronics: (1)serial powering, (2) light weight aluminum flex cables and Through Silicon Vias, and (3) thin Front-End chips. The methods are presented in this paper using the upgrades of the ATLAS pixel detector as an example of application. (C) 2010 Elsevier B.V. All rights reserved
The shunt-LDO regulator to power the upgraded ATLAS pixel detector
No full textThe shunt-LDO regulator is a new regulator concept which combines a shunt and a Low Drop-Out (LDO) regulator. Designed as an improved shunt regulator to match the needs of serially powered detector systems, it can also be used as a pure LDO regulator for general application in powering schemes requiring linear regulation. The flexibility of the design makes the shunt-LDO regulator a good candidate for use in the powering schemes envisaged for the upgrades of the ATLAS pixel detector. Two shunt-LDO regulators integrated in the prototype of the next ATLAS pixel front-end chip, the FE-I4A, are used to demonstrate the feasibility of the proposed powering solutions
Performance evaluation of a serially powered pixel detector prototype for the HL-LHC
No full textEfficient and low mass power distribution presents a challenge for vertex and tracking detectors at the HL-LHC. Different approaches have been considered to transmit power at low current and high voltage. This paper presents the serial powering scheme proposed as baseline for the ATLAS and CMS pixel detectors at the HL-LHC. A serially powered detector prototype with six pixel modules has been built, featuring all elements needed for current distribution, redundancy, data transmission, and sensor biasing. Results of the characterisation of the prototype in standard operating conditions as well as in more challenging scenarios including increased digital activity are presented
A serial powering pixel stave prototype for the ATLAS ITk upgrade
No full textOne of the main challenges for the ATLAS ITk Phase II Pixel upgrade is low-mass efficient power distribution for detector modules. This requires a powering scheme alternative to the parallel (direct) powering which is currently used. A serial powering scheme has been chosen as the baseline for the ITk pixel system. A serially powered pixel detector prototype has been built with all the components that are needed for current distribution, data transmission, bypassing and redundancy in order to prove the feasibility of implementing serial powering scheme in the ITk. Detailed investigations of the electrical performance of the detector prototype equipped with FE-I4 quad modules have been made with the help of the USBpix3 readout system that has been developed in Bonn
A via last TSV process applied to ATLAS pixel detector modules: proof of principle demonstration
No full textVia last Through Silicon Vias (TSVs) can be exploited to build low material modules for the upgrades of the ATLAS pixel detector at the High Luminosity LHC. To prove this concept a via last TSV process is demonstrated on ATLAS pixel readout wafers. Demonstrator modules featuring 90 mu m thin readout chips with TSVs are operated using the connection from the back side of the chip. This paper illustrates the via formation process and the results from the characterization of modules with TSVs
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
A serial powering scheme for the ATLAS pixel detector at sLHC
No full textPowering concepts, such as serial powering and DC-DC conversion, are in development for the silicon trackers at sLHC to achieve an efficient power distribution with a minimum volume of cables. This paper will describe the serial powering scheme developed for the upgraded ATLAS pixel detector, with focus on the scheme architecture and on the main components involved: the Shunt-LDO regulator and the protection scheme. Issues connected to system aspects will be discussed, and the advantages in terms of material reduction provided by the proposed serial powering scheme will be presented
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
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