Intermediate silicon layers detector for the CDF experiment Affolder, A; Azzi-Bacchetta, P; Bacchetta, N ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2000, Letnik:
453, Številka:
1
Journal Article
Recenzirano
The Intermediate Silicon Layers (ISL) detector is currently being built as part of the CDF II detector upgrade project. The ISL detector will significantly improve tracking in the central region and, ...together with the Silicon Vertex detector, provide stand-alone 3D track information in the forward/backward regions. In this article, we present the quality of the production sensors manufactured by Hamamatsu Photonics, which account for roughly half of the silicon sensors used in the ISL detector.
The layer 0 inner silicon detector of the D0 experiment Angstadt, R.; Bagby, L.; Bean, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2010, Letnik:
622, Številka:
1
Journal Article
Recenzirano
This paper describes the design, fabrication, installation and performance of the new inner layer called Layer 0 (L0) that was inserted in the existing Run IIa silicon micro-strip tracker (SMT) of ...the D0 experiment at the Fermilab Tevatron p¯p collider. L0 provides tracking information from two layers of sensors, which are mounted with center lines at a radial distance of 16.1 and 17.6mm from the beam axis. The sensors and read-out electronics are mounted on a specially designed and fabricated carbon fiber structure that includes cooling for sensor and read-out electronics. The structure has a thin polyimide circuit bonded to it so that the circuit couples electrically to the carbon fiber allowing the support structure to be used both for detector grounding and a low impedance connection between the remotely mounted hybrids and the sensors.
Selected mechanical engineering topics of the SVX II detector at CDF Ratzmann, P; Flaugher, B; Howell, J ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/1998, Letnik:
409, Številka:
1-3
Journal Article
Recenzirano
The CDF collaboration is designing a second-generation silicon detector, SVX II, for Run II of the Fermilab Tevatron Collider. Portions of the SVX II have been constructed for the purpose of ...mechanical testing and design verification. The cooling performance of the ladders has been measured and compared to values expected from earlier design work, and there is an update on the expected effect of radiation damage. The bulkhead, a precision machined support structure made of beryllium, is discussed from both a design and fabrication perspective. Adhesives for ladder construction and bulkhead gluing are discussed. The focus of this presentation is on in-hand materials and measurements which have been completed in support of the mechanical design.
Cotonicultores do cerrado, receosos da ocorrência de fitotoxicidade, têm utilizado o herbicida alachlor em dosagens inferiores à mínima recomendada na bula, com baixo efeito residual. Com o objetivo ...de estudar fatores relacionados à seletividade do alachlor ao algodoeiro, foram realizados dois experimentos. No primeiro, em caixas de germinação com substrato areia, foi estudado o herbicida alachlor em dois níveis (sem alachlor e na dose de 96 µg kg-1 de substrato), em ambientes compostos pela combinação das temperaturas de 20, 25, 30 e 35 ºC com três níveis de umidade no substrato (40, 60 e 80% da capacidade de retenção de água). A avaliação foi realizada aos 10 dias. As condições do ambiente influenciaram o crescimento das plântulas, mas essa resposta foi reduzida ou anulada na presença do alachlor; quanto mais favoráveis as condições, proporcionalmente maiores foram as reduções. O herbicida reduziu características da parte aérea e, em maior intensidade, o comprimento das raízes. No segundo ensaio, em vasos com solo, foram estudados três tratamentos de irrigação (23, 34 e 45 mm) após aplicação de dois níveis de alachlor (0 e 2,88 kg ha-1). A avaliação foi realizada aos 21 dias. Maiores níveis de irrigação causaram redução na matéria fresca e seca das raízes. O alachlor reduziu todas as variáveis medidas na parte aérea das plantas, mas, de modo geral, esse efeito foi de baixa intensidade e ocorreu de maneira semelhante nos níveis de irrigação. A independência dos efeitos entre alachlor e irrigação não corroboraram a premissa de que maiores níveis de água aumentariam a lixiviação do herbicida e a fitotoxicidade ao algodoeiro.
Brazilian savanna cotton growers in fear of phytotoxicity have been using the herbicide alachlor below the minimum dosage recommended by the manufacturer, with low residual activity. Two experiments were carried out to study factors related to alachlor selectivity to cotton. The first assay used germination boxes with sand substrate to study two alachlor rates (0 and 96 µg kg-1) at temperatures of 20, 25, 30, and 35 ºC, combined with three levels of substrate moisture (40%, 60%, and 80% of water holding capacity) and evaluated after 10 days. Seedling growth was affected by environmental conditions, but this response was reduced or cancelled when alachlor was present, with better conditions causing proportionally greater growth reductions. The herbicide caused reductions in aerial part traits and, to a greater extent, in root length. The second assay consisted of pots filled with soil substrate and three irrigation treatments (23, 34, and 45 mm) studied after application of two alachlor levels (0 and 2.88 kg ha-1), and evaluated after 21 days. Higher irrigation levels caused reductions in fresh and dry matter of the roots. Alachlor reduced all variables measured in the aerial part of the cotton plants, but this effect, in general, had low intensity and was similar for all the irrigation levels. The independent effect between alachlor and irrigation does not support the assumption that higher water levels would increase herbicide leaching and its phytotoxicity to cotton.
The CDF silicon vertex detector
Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1994
Journal Article
The Silicon Vertex Detector of the Collider Detector at Fermilab
Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/1994
Journal Article
Electrical performance of the CDF silicon vertex detector
Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1994
Journal Article
A new silicon microstrip detector was designed by the CDF collaboration for the proposed high-luminosity operation of the Tevatron
p
p
¯
collider (Run IIb). The detector is radiation-tolerant and ...will still be functional after exposure to particle fluences of
10
14
1
-
MeV
equivalent
neutrons
/
cm
2
and radiation doses of 20
MRad. The detector will maintain or exceed the performance of the current CDF silicon detector throughout Run IIb. It is based on an innovative silicon “supermodule” design. Critical detector components like the custom radiation-hard SVX4 readout chip, the beryllia hybrids and mini-port (repeater) cards, and the silicon sensors fulfill their specifications and were produced with high yields. The design goals and solutions of the CDF Run IIb silicon detector are described, and the performance of preproduction modules is presented in detail. Results relevant for the development of future silicon systems are emphasized.
The Western museum, because of its specific history, is an institution that has historically privileged the male experience and enforced a rigid gender binary. This study, performed at the History ...Colorado Center in Denver, Colorado, looked to understand how visitors interpret gender within a history museum exhibition. Eighty visitors were interviewed and asked questions about their exhibit experience, including questions about their interpretations of gender, after their visit to the exhibition Destination Colorado . This was complimented by interviews with the three members of the exhibit development team in order to understand what aspects of gender within the exhibit were deliberately developed. The results show that visitors do notice gender and suggest that gender is an identity that should be engaged with in future studies of visitor interpretation and by development teams during the process of creating an exhibition.
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