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1.
X. Defay A. Broniatowski A. Juillard S. Marnieros M. Chapellier L. Dumoulin S. Collin L. Bergé F. Lalu X. F. Navick 《Journal of Low Temperature Physics》2008,151(3-4):896-901
A new design of an ionization-heat germanium detector for dark matter search is presented, based on the use of interleaved
electrodes for charge collection. This device allows active rejection of surface events by performing the appropriate cuts
in the charge measurement data. Test experiments were performed with a prototype device, fitted with annular collection electrodes
and with a neutron transmutation-doped Ge thermometer. Calibration runs with gamma and neutron sources demonstrate the remarkable
possibilities offered by this type of detector in terms of surface event discrimination.
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2.
Donna M. Qualters Thomas C. Sheahan Emanuel J. Mason David S. Navick Matthew Dixon 《工程教育杂志》2008,97(1):37-45
This paper describes a feedback process that assessed first‐year engineering student learning using a mastery exam. The results were used to improve learning and teaching in first‐year courses. To design the initial exam, basic knowledge and concepts were identified by instructors from each of the host departments (Chemistry, Math, Physics and Computer Science). In 2004, the 45‐item exam was administered to 191 second‐year engineering students, and in September 2005, the revised exam was administered to the next class of second‐year engineering students. The exam was analyzed using Item Response Theory (IRT) to determine student abilities in each subject area tested. Between exam administrations, workshops were conducted with the four department instructor groups to present exam results and discuss teaching issues. The exam provided a learning assessment mechanism that can be used to engage faculty in science, mathematics, and engineering in productive linkages for continual improvement to curriculum. 相似文献
3.
A. Aliane F. De Moro C. Pigot P. Agnese X. de la Broïse A. Gasse X.-F. Navick M. Karolak H. Ribot J.-L. Sauvageot V. Szeflinski Y. Gobil D. Renaud P. Rivallin H. Geoffray 《Journal of Low Temperature Physics》2008,151(1-2):381-386
X-ray Astronomy provides a unique window on a wide variety of astrophysical phenomena. The currently operating X-ray space
observatories perform X-ray spectral imaging with the use of CCDs. When available, cryogenic X-ray microcalorimeter arrays
will far outperform CCDs in terms of spectral resolution, energy bandwidth and count rate. Experience has been gained with
Infra-Red bolometer arrays at CEA-LETI (Grenoble) in collaboration with the CEA-SAp (Saclay); taking advantage of this background,
we are now developing an X-ray spectro-imaging camera for the next generation space astronomy missions, using silicon technology
(implanted and high temperature diffused thermistors).
Each pixel of this array detector is made of a tantalum absorber bound, by indium bump hybridization, to a silicon thermistor.
The absorber array is bound to the thermistor array in a single automatic step. The thermo-mechanical link, provided by hybridization,
is being improved in terms of thermal capacitance. Finally, our main effort is in developing arrays of silicon thermistors
with negligible excess 1/f noise. The thermistor has been simulated with the 2D simulator ATHENA (SILVACO International). We studied the effects of
the implants and their thermal treatment on both vertical and lateral dopant distributions at the edges of the thermistor.
Prototypes have been created following the procedure optimized by the ATHENA simulation. We present the status of the development
and results of measurements performed on these four main building blocks required to create a detector array up to 32×32 pixels
in size.
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4.
O. Martineau A. Benoît L. Berg A. Broniatowski L. Chabert B. Chambon M. Chapellier G. Chardin P. Charvin M. De Jsus P. Di Stefano D. Drain L. Dumoulin J. Gascon G. Gerbier E. Gerlic C. Goldbach M. Goyot M. Gros J. P. Hadjout S. Herv A. Juillard A. de Lesquen M. Loidl J. Mallet S. Marnieros N. Mirabolfathi L. Mosca X. -F. Navick G. Nollez P. Pari C. Riccio V. Sanglard L. Schoeffel M. Stern L. Vagneron The EDELWEISS Collaboration 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2004,530(3):426-439
Several aspects of the analysis of the data obtained with the cryogenic heat-and-ionization Ge detectors used by the EDELWEISS dark matter search experiment are presented. Their calibration, the determination of their energy threshold, fiducial volume and nuclear recoil acceptance are detailed. 相似文献
5.
6.
Xavier-Francois Navick Cyril Bachelet David Bouville Noel Coron Laurent Devoyon Andrea Giuliani David Gray Serge Hervé Vincent Humbert Mathieu Lemaitre Martin Loidl Pierre de Marcillac Claudia Nones Yves Pénichot Thierry Redon Alexis René Matias Rodrigues 《Journal of Low Temperature Physics》2016,184(1-2):292-298
7.
X.-F. Navick 《Journal of Low Temperature Physics》2014,176(5-6):995-1001
In dark matter WIMP searches the fundamental background is due to neutron flux. Thus shielding plays a crucial role in attenuating this flux and consequently in suppressing nuclear recoil background events. The transition from EDELWEISS-II to EDELWEISS-III with a total fiducial mass of 24 kg and improved background rejection has required the modification of the neutron shielding. In this paper we describe the design of this new neutron shielding and give an estimate of the expected neutron rate in comparison with the EDELWEISS-II experiment. 相似文献
8.
A. Broniatowski X. Defay A. Juillard S. Marnieros L. Dumoulin M. Chapellier X.-F. Navick F. Schwamm 《Journal of Low Temperature Physics》2008,151(3-4):830-834
Detectors fitted with interleaved collection electrodes offer a promising solution to the problem of surface event rejection
in cryogenic Ge detectors for dark matter search. Detector design and modeling are discussed, based on computer simulations
of the collection field and on pulse-shape analysis of the ionization signals. Test experiments with a prototype detector
are presented in a companion paper by X. Defay et al. in this conference.
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9.
X. -F. Navick M. Carty M. Chapellier G. Chardin C. Goldbach R. Granelli S. Herv M. Karolak G. Nollez F. Nizery C. Riccio P. Starzynski V. Villar 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2004,520(1-3):189-192
In its first stage, the EDELWEISS-II dark matter experiment will use 21×320 g ionization-heat bolometers with NTD thermal sensors. To improve the present sensitivity of EDELWEISS to WIMP interactions by a further factor 100, ultra-low radioactivity detector holders exclusively made of copper and Teflon have been designed. The new design is using the relative expansion coefficients of copper, Teflon and germanium to hopefully ensure a dissipation-free detector holding.
In order to validate this new holder, we need to compare the vibration behavior of the old holder and the new one. The amplitude of the bolometer vibrations is measured using the variation of capacitance between electrodes sputtered on the Ge crystal and reference electrodes fixed above the detector holders. We present noise measurements and compare them to the equivalent measurements using the detector holders of the Edelweiss-I experiment, which gave very satisfying results. 相似文献
10.
X.-F. Navick 《Journal of Low Temperature Physics》2008,151(3-4):891-895
The discrimination power of the NTD ionization-heat detectors to distinguish nuclear recoils from electron recoils is affected
by events interpreted as surface events. On the basis of the data from EDELWEISS I and first data taking of EDELWEISS-2, we
present a coherent interpretation and direct evidence that surface events occur and are due to radon daughter deposition on
detector surface and close-by surfaces. The estimation of the surface activities of contaminated surface are extracted from
the new data taking.
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