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Qualification Tests of 474 Photomultiplier Tubes for the Inner Detector of the Double Chooz Experiment  [PDF]
C. Bauer,E. Borger,R. Hofacker,K. J?nner,F. Kaether,C. Langbrandtner,M. Lindner,S. Lucht,M. Reissfelder,S. Sch?nert,A. Stüken,C. Wiebusch
Physics , 2011, DOI: 10.1088/1748-0221/6/06/P06008
Abstract: The hemispherical 10" photomultiplier tube (PMT) R7081 from Hamamatsu Photonics K.K. (HPK) is used in various experiments in particle and astroparticle physics. We describe the test and calibration of 474 PMTs for the reactor antineutrino experiment Double Chooz. The unique test setup at Max-Planck-Institut f\"ur Kernphysik Heidelberg (MPIK) allows one to calibrate 30 PMTs simultaneously and to characterize the single photo electron response, transit time spread, linear behaviour and saturation effects, photon detection efficiency and high voltage calibration.
The Trigger and Timing System of the Double Chooz Experiment  [PDF]
F. Beissel,A. Cabrera,A. Cucuanes,J. V. Dawson,D. Kryn,C. Kuhnt,S. Lucht,B. Reinhold,M. Rosenthal,S. Roth,A. Stahl,A. Stüken,C. Wiebusch
Physics , 2012, DOI: 10.1088/1748-0221/8/01/T01003
Abstract: Modern precision neutrino experiments like Double Chooz require a highly efficient trigger system in order to reduce systematic uncertainties. The trigger and timing system of the Double Chooz experiment was designed according to this goal. The Double Chooz trigger system is driven by the basic idea of triggering on multiple thresholds according to the total visible energy and additionally triggering on the number of active photomultiplier tubes (PMTs) in the detector. To do so, the trigger system continuously monitors the analogue signals from all PMTs in the detector. The amplitudes of these PMT-signals are summed for groups of certain PMTs (group signals) and for all PMTs (sum signal), respectively. The group signals are discriminated by two thresholds for each input channel and four thresholds for the sum signal. The resulting signals are processed by the trigger logic unit which is implemented in a FPGA. In addition to the proper trigger, the trigger system provides a common clock signal for all subsequent data acquisition systems to guarantee a synchronous readout of the Double Chooz detectors. The present design of the system provides a high flexibility for the applied logic and settings, making it useful for experiments other than Double Chooz. The Double Chooz trigger and timing system was installed and commissioned in 2011. This article describes the hardware of the trigger and timing system. Furthermore the setup, implemented trigger logic and performance of the trigger and timing system for the Double Chooz experiment is presented.
From Double Chooz to Triple Chooz - Neutrino Physics at the Chooz Reactor Complex  [PDF]
P. Huber,J. Kopp,M. Lindner,M. Rolinec,W. Winter
Physics , 2006, DOI: 10.1088/1126-6708/2006/05/072
Abstract: We discuss the potential of the proposed Double Chooz reactor experiment to measure the neutrino mixing angle $\sin^2 2\theta_{13}$. We especially consider systematical uncertainties and their partial cancellation in a near and far detector operation, and we discuss implications of a delayed near detector startup. Furthermore, we introduce Triple Chooz, which is a possible upgrade scenario assuming a second, larger far detector, which could start data taking in an existing cavern five years after the first far detector. We review the role of the Chooz reactor experiments in the global context of future neutrino beam experiments. We find that both Double Chooz and Triple Chooz can play a leading role in the search for a finite value of $\sin^2 2\theta_{13}$. Double Chooz could achieve a sensitivity limit of $\sim 2 \cdot 10^{-2}$ at the 90%~confidence level after 5~years while the Triple Chooz setup could give a sensitivity below $10^{-2}$.
The Double Chooz Experiment  [PDF]
Charles E. Lane
Physics , 2008,
Abstract: The Double Chooz experiment returns to the site of the Chooz experiment with a pair of detectors for a differential neutrino flux measurement, providing sensitivity to sin^2(2theta13) > 0.03. Reaching this goal requires significant improvements in systematic uncertainties, based on the experience with previous reactor neutrino experiments.
Double Chooz: Optimizing CHOOZ for a possible theta 13 measurement  [PDF]
S. A. Dazeley,for the Double Chooz Collaboration
Physics , 2005,
Abstract: The proposed Double Chooz theta 13 experiment is described. Double Chooz will be an optimized reactor disappearance experiment similar to the original CHOOZ. The optimization includes an increase in the signal to noise by increasing the target volume to twice the original CHOOZ, reducing singles background with a non-scintillating oil buffer region around the target and carefully controlling systematic uncertainties by measuring the electron antineutrino flux of the source with a near detector. The Double Chooz far detector will be situated in the same cavern as CHOOZ but will detect ~50000 electron antineutrinos in three years of operation. We estimate a systematic uncertainty of 0.6%, and a reduction of the upper limit on theta 13 to 5 degrees.
Monte Carlo aided design of the inner muon veto detectors for the Double Chooz experiment  [PDF]
D. Dietrich,D. Greiner,J. Jochum,T. Lachenmaier,L. F. F. Stokes,M. R?hling
Physics , 2012, DOI: 10.1088/1748-0221/7/08/P08012
Abstract: The Double Chooz neutrino experiment aims to measure the last unknown neutrino mixing angle theta_13 using two identical detectors positioned at sites both near and far from the reactor cores of the Chooz nuclear power plant. To suppress correlated background induced by cosmic muons in the detectors, they are protected by veto detector systems. One of these systems is the inner muon veto. It is an active liquid scintillator based detector and instrumented with encapsulated photomultiplier tubes. In this paper we describe the Monte Carlo aided design process of the inner muon veto, that resulted in a detector configuration with 78 PMTs yielding an efficiency of 99.978 +- 0.004% for rejecting muon events and an efficiency of >98.98% for rejecting correlated events induced by muons. A veto detector of this design is currently used at the far detector site and will be built and incorporated as the muon identification system at the near site of the Double Chooz experiment.
Status Report on Double Chooz  [PDF]
A. Portaa,for the Double Chooz collaboration
Physics , 2009,
Abstract: Double Chooz main target is to measure Theta13 oscillation parameter by comparing reactor neutrino fluxes in two identical detectors located respectively at 400 m and 1 km away from the 2 Chooz reactor cores. The far detector is now under construction, while we have just completed the design phase of the near one. In this report I will discuss the detector principle, sensitivity and its present construction status.
The Double Chooz Experiment  [PDF]
Daniel M. Kaplan
Physics , 2006, DOI: 10.1063/1.2402699
Abstract: There is broad consensus in the worldwide physics community as to the need for a new reactor-neutrino experiment to measure or limit the neutrino mixing angle $\theta_{13}$. The Double Chooz Experiment, planned for operation in the years 2008-2011, will search for values of $\sin^2{2\theta_{13}}$ down to $\approx$0.03. This will be the first new information on $\theta_{13}$ in over a decade and will cover most of the remaining parameter space. A quick and relatively inexpensive project is made possible by the existing neutrino laboratory at the Chooz site.
Double-Chooz Neutrino Experiment  [PDF]
C. Palomares
Physics , 2009,
Abstract: The Double Chooz experiment will use the electron antineutrinos produced by the Chooz nuclear power station to search for a non-vanishing value of the Theta_13 neutrino mixing angle. Double Chooz will be the first of a new generation of neutrino experiments using identical detectors at different distances from the neutrino source to reduce the systematic errors due to the uncertainties on the neutrino flux and to the detector acceptance. The far detector is expected to be operative by the beginning of 2010. Installation of the near detector will occur in 2010.
String Partons and Multiple Quantisation  [PDF]
Phil E. Gibbs
Physics , 1996,
Abstract: I consider an algebraic construction of creation and annihilation operators for superstring and p-brane parton models. The result can be interpreted as a realisation of multiple quantisation and suggests a relationship between quantisation and dimension. The most general algebraic form of quantisation may eventually be expressed in the language of category theory.
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