79 research outputs found
Long term experience with CsI photocathodes in gas photon detectors
No full textRICH-1 is a Cherenkov Imaging detector in operation at the COMPASS experiment at CERN SPS since 2001. MWPCs equipped with CsI photocathodes have been used as photon detectors,for the full detection area in the first years of operation, and for 75% of the area after a detector upgrade in 2006.The mean number of detected photons per particle has been extracted from the data collected during six years of COMPASS data taking.An indirect measurement of possible variations of the CsI quantum efficiency versus time is obtained from this analysis
Measurement of the evolution of the CsI quantum efficiency in gas photon detectors
No full textWe present an indirect measurement of possible long term variations of the CsI quantum efficiency in solid state photocathodes in MWPC. This type of photon detectors has been used since 2001 in the Cherenkov Imaging detector RICH-1 of the COMPASS experiment at CERN SPS. Data from six years of COMPASS data taking are used to evaluate the mean number of detected photons per particle. The results do not indicate any severe CsI quantum efficiency ageing effect
The COMPASS Event Store in 2002
No full textCOMPASS, the fixed-target experiment at CERN studying the structure of the nucleon and spectroscopy, collected over 260 TB during summer 2002 run. All these data, together with reconstructed events information, were put from the beginning in a database infrastructure based on Objectivity/DB and on the hierarchical storage manager CASTOR. The experience in the usage of the database is reviewed and the evolution of the system outlined.COMPASS, the fixed-target experiment at CERN studying the structure of the nucleon and spectroscopy, collected over 260 TB during summer 2002 run. All these data, together with reconstructed events information, were put from the beginning in a database infrastructure based on Objectivity/DB and on the hierarchical storage manager CASTOR. The experience in the usage of the database is reviewed and the evolution of the system outlined
The radiator gas and the gas system of COMPASS RICH-1
No full textAlbrecht E, Baum G, Bellunato T, et al. The radiator gas and the gas system of COMPASS RICH-1. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Nucl.Instrum.Meth. A. Vol 502. Elsevier Science BV; 2003: 266-269.The design of the COMPASS RICH-1 gas system, its operational modes, the cleaning setups for the preparation of the radiator gas and transmission measurement installations are described. The gas system in presently fully operational and satisfactory transmission of VUV light through the radiator gas has been reached. (C) 2003 Elsevier Science B.V. All rights reserved
The gain in Thick GEM multipliers and its time-evolution
No full textIn the context of a project to upgrade the gas photon detectors of COMPASS RICH-1, we have performed an R&D programme aimed to develop photon detectors based on multi-layer arrangements of thick GEM electron multipliers coupled to a CsI photoconverter. For this purpose, thick GEMs have been characterised in detail including the gain performance, its dependance on the geometrical parameters and its time-evolution, a feature exhibited by the gas detectors with open insulator surfaces. The variation due to this evolution drammatically depends on the parameters themselves.
In the present article we summarise the outcomes of the studies dedicated to the thick GEM gain and its evolution versus time. We also include a qualitative model which accounts for the peculiar details of the observed thick GEM gain time-evolution
Velhos crimes, novas histórias: electras reconfiguradas
No full textGreek myths have been constantly revisited in modern literature. Names like
Ulysses, Orpheus, and Electra have figured in works that, even set in socio-historical contexts
that are different from those to which these myths belong in their classical form, resort to
these Greek legends to create new narratives, closer to the discursive communities to which
they belong. The rewriting, by each author, of a classical character, inserting it in a new
context, also provides a new analysis for comparative studies in literature, since it allows a
reflection that considers not only the narrative, but also the socio-discursive characteristics
presented in these texts, which must also be understood as new. In this work, our perspective
is to analyze the myth of Electra, as it appears in the trilogy The Oresteia (458 BC), of
Aeschylus and its Brazilian resumption: the play Senhora dos Afogados, [The Lady of the
Drowned] (2012), by Nelson Rodrigues. Our goal is to show how the Brazilian playwright
revisits the myth of Electra to reconfigure it and, thus, telling a new story, more pertinent to
Rio de Janeiro in the 1950s. It occurs that between Aeschylus and Rodrigues, a whole range
of authors established dialogues with this Greek myth, presenting in each epoch in which it
reconfigures, fundamental differences so that it is understood not only the rewriting itself, but
also a series of contextual and co-textual elements that witness the generic configuration of
each work promoted by the author, the editor, the translator, in some cases, and even by the
reader. In order to show these connections, we try to walk the path that leads from Aeschylus
to Nelson Rodrigues, focusing mainly in Eugene O'Neill (1970) author with whom Nelson
Rodrigues explicitly interacts when rewriting the Greek to approach his time and his society.
To carry out our analysis, it takes as a basis the Differential and discursive comparison of
Greek mythos proposed by Ute Heidmann (2003, 2010, 2012), that sees each piece that based
on classic myth as an answer to the precedent text, refusing the idea of influence between
those texts; and the studies on Discourse Analysis developed by Dominique Maingueneau
(2001, 2006). As a result, it presents a Lady of the drowned that reconfigure the classic myth
and tragedy genre, as far as it subvert this genre, creating a new genre, social and historically
situated: a Rodrigues-like tragedy. Rodrigues presents himself as the only dramaturg analyzed
in this study who reconfigures Electra myth in a more effective and more radical way, with
real inversions.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Os mitos gregos têm sido constantemente retomados na literatura moderna. Nomes
como os de Ulisses, Orfeu e Electra têm figurado em obras que, mesmo ambientadas em
contextos sócio-históricos diferentes daqueles nos quais esses mitos aparecem em sua forma
clássica, interagem com eles para, a partir disso, criar novas narrativas, mais próximas das
comunidades discursivas às quais os novos autores pertencem. A reescritura, por parte de cada
autor, de uma personagem clássica, inserindo-a em novo contexto, propicia também um novo
viés de análise para os estudos comparativos em literatura, pois possibilita uma reflexão que
considera não só a narrativa mas também as características sociodiscursivas presentes nesses
textos, que devem igualmente ser compreendidos como novos. Neste trabalho, a perspectiva é
analisar o mito de Electra, desde sua aparição na trilogia Oresteia (458 a.C.), de Ésquilo até
sua retomada brasileira na peça Senhora dos Afogados (2012), de Nelson Rodrigues. O
objetivo deste estudo é mostrar como o dramaturgo brasileiro dialoga com o mito clássico e,
ao fazê-lo, reconfigura toda a sua fábula. Assim, o dramaturgo brasileiro conta uma nova
história, mais pertinente ao Rio de Janeiro dos anos 1950. Ocorre que, entre Ésquilo e
Rodrigues, toda uma gama de autores estabeleceu diálogos com esse mito grego,
apresentando, em cada época em que ele se reconfigura, diferenças fundamentais para que se
entendam não só a reescritura ela mesma mas também uma série de elementos contextuais e
cotextuais que testemunha a configuração genérica de cada obra, configuração esta que pode
ser promovida pelo autor, pelo editor, pelo tradutor, em alguns casos, e até mesmo pelo leitor.
Para mostrar essas relações, procura percorrer o caminho que leva de Ésquilo a Nelson
Rodrigues, principalmente Eugene O’Neill (1970), autor com o qual Nelson Rodrigues
interage explicitamente ao reescrever o mito grego para falar de sua época e de sua sociedade.
Como fundamentos teóricos de análise, toma como base a Comparação diferencial e
discursiva dos mitos gregos proposta por Ute Heidmann (2003, 2010, 2012), que compreende
cada obra que retomou o mito clássico como uma resposta ao texto precedente, recusando
assim a noção de influência que um texto pode manter em relação àqueles que o sucedem; e
os estudos acerca da Análise do Discurso desenvolvidos por Dominique Maingueneau (2001,
2006). Como resultado, apresenta uma Senhora dos Afogados que reconfigura não só o mito
clássico mas também o gênero tragédia, na medida em que o subverte, criando um novo
gênero, situado social e historicamente: a tragédia rodriguiana. Rodrigues se apresenta como o
único dos dramaturgos analisados nesta pesquisa que reconfigura o mito de Electra de
maneira mais efetiva, ou mesmo radical, operando verdadeiras inversões
Compass RICH-1
No full textAlbrecht E, Baum G, Birsa R, et al. Compass RICH-1. In: Nucl.Instrum.Methods A. Vol 502. ELSEVIER SCIENCE BV; 2003: 112-116.RICH-1 is a large acceptance gaseous RICH using 3 m of C4F10 as radiator and MWPCs with CsI photo-cathodes as VUV photon detectors. The main characteristics of this RICH are the large acceptance and the use of far UV photon detectors. which implies large dimensions, UV transparencies of the elements up to the photo-cathode, and good UV mirror reflectance. We give a description of the detector, first results about its performances and a report about various technological achievements required by this challenging project. (C) 2003 Elsevier Science B.V. All rights reserved
Metadramaturgia e escrita performática na obra dramatúrgica de Nikolai Gógol
No full textThis research is a result of a theoretical reflection about on the work of Russian writer
dramaturgical Nikolai Gógol and the ways in which his initial experiments were crucial not
only on what concerns the building of own work identity, but also the construction of the
various forms of conception and creation of work dramaturgical and the way they have
influenced modern theatre. The work holds the analysis of gogoliana metadramaturgical
trilogy and comprising the following plays: The inspector general (1836), Leaving the theater
after the performance of a new comedy (1842) and Denouement of The inspector general
(1846). As such, are of particular interest to this work, the concepts of metadramaturgy and
writing performatic are fundamental to the analysis of the playwright's work. The study on
metadramaturgy will be worked from the analysis of de metalanguage and metatheatre so that
we can understand how to structure the idea of metadramaturgy and how this concept can be
used in the analysis of dramaturgical works. The idea of writing performatic includes the
study of the work from the performative bias, to understand the author and the reader/viewer
as protagonists of this relationship. From the studies of these two concepts, metadramaturgy
and writing performatic, shall be able to understand more deeply the different aspects of the
author's work, particularly in terms of past the relevance of his writing.Esta pesquisa é produto de uma reflexão teórica sobre a obra dramatúrgica do escritor russo Nikolai Gógol e os modos pelos quais as suas experiências iniciais e o contexto histórico foram determinantes, não apenas para construção de uma identidade no seu trabalho como autor, mas também, para as diferentes formas de concepção e construção da obra dramática que surgem no contexto do teatro moderno. O trabalho se detém à análise da trilogia metadramatúrgica gogoliana que compreende as seguintes peças: O inspetor geral (1836), À saída do teatro depois da representação de uma nova comédia (1842) e Desenlace de O inspetor geral (1846). Dessa forma, são de interesse particular para esse trabalho, os conceitos de metadramaturgia e escrita performática, os quais serão basilares para a análise da obra do dramaturgo. O estudo sobre a metadramaturgia será trabalhado a partir da análise da metalinguagem e do metateatro para que, assim, possamos compreender como se estrutura a ideia de metadramaturgia e como esse conceito pode ser utilizado na análise de obras dramatúrgicas. O conceito de escrita performática compreende o estudo da obra a partir do viés performativo, ao entender o autor e o leitor/espectador como protagonistas desta relação. A partir dos estudos desses dois conceitos, de metadramaturgia e de escrita performática, poder-se-á compreender, mais profundamente, os diferentes aspectos da obra do autor, principalmente, no que se refere à atualidade de sua escrita
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