Digital Advances In Triggering And Data Acquisition Systems For Large Scale Dark Matter Search Experiments

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Digital Advances in Triggering and Data Acquisition Systems for Large Scale Dark Matter Search Experiments

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Author : Eryk Filip Druszkiewicz
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (1 download)

Book Synopsis Digital Advances in Triggering and Data Acquisition Systems for Large Scale Dark Matter Search Experiments by : Eryk Filip Druszkiewicz

Download or read book Digital Advances in Triggering and Data Acquisition Systems for Large Scale Dark Matter Search Experiments written by Eryk Filip Druszkiewicz and published by . This book was released on 2017 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: "With a wealth of astrophysical evidence that confirms that the baryonic matter we understand accounts for only 5% of the matter and energy in the universe, the search is on for the mysterious dark matter, that is said to account for 25% of the universe composition. The leading candidate for dark matter is the Weakly Interacting Massive Particle (WIMP). Large Underground Xenon (LUX), a 370 kg two-phase (liquid/gas) xenon time projection chamber operating at 4850 feet underground at the Sanford Underground Research Facility (SURF), has recently completed its operation, setting the world's best limit on the WIMP-nucleon cross section. This thesis presents the author's research and development of a novel, FPGA-based, triggering system. This system has operated at SURF since 2011 and through digital signal processing techniques identified events of interest in real-time. The system processes the incoming data at its filter stages with a rate of 5,100 MB/s and does so consuming a total of only 15 W. The firmware and software were entirely developed by the author, while the custom-built hardware was developed in close collaboration with the author. The system offers great flexibility through the reconfigurability feature of FPGAs, which was exercised often during the course of the experiment. The system allows for fully remote operation, minimizing the personnel needs one mile underground. For this type of detectors, this triggering system has shown to offer the highest efficiency in detecting signals as small as few liquid electrons. An FIR digital filter implementation is presented, that has been tailored for this application and offers an up to 99% and 97% savings in scalars and summers utilization, respectively. LUX-Zepplin (LZ) is a next-generation dark matter detector, that is scheduled to start probing the remainder of the uncharted WIMP-nucleon cross section in 2020. It is a significantly larger successor of LUX, with a total xenon mass of 10 tonne. It will be instrumented with 745 photomultipliers, totaling 1,359 digitizing channels. The author is developing the LZ Data Acquisition and Data Sparsification system. This system is going to handle a continuous input rate of over 200 GB/s and its key elements have already been shown to meet and exceed the LZ requirements. Techniques are presented for allowing data volume footprint reduction, such as efficient digitized pulse storage, offering up to 45% reduction in the effective pulse storage size."--Pages xi-xii.

Searching for Dark Matter with the ATLAS Detector

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Author : Steven Schramm
Publisher : Springer
ISBN 13 : 3319444530
Total Pages : 341 pages
Book Rating : 4.3/5 (194 download)

Book Synopsis Searching for Dark Matter with the ATLAS Detector by : Steven Schramm

Download or read book Searching for Dark Matter with the ATLAS Detector written by Steven Schramm and published by Springer. This book was released on 2016-11-23 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the search for Dark Matter at the LHC in the mono-jet plus missing transverse momentum final state, using the full dataset recorded in 2012 by the ATLAS Experiment. It is the first time that the number of jets is not explicitly restricted to one or two, thus increasing the sensitivity to new signals. Instead, a balance between the most energetic jet and the missing transverse momentum is required, thus selecting mono-jet-like final states. Collider searches for Dark Matter have typically used signal models employing effective field theories (EFTs), even when comparing to results from direct and indirect detection experiments, where the difference in energy scale renders many such comparisons invalid. The thesis features the first robust and comprehensive treatment of the validity of EFTs in collider searches, and provides a means by which the different classifications of Dark Matter experiments can be compared on a sound and fair basis.

The Electronics and Data Acquisition System of the DarkSide Dark Matter Search

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (967 download)

Book Synopsis The Electronics and Data Acquisition System of the DarkSide Dark Matter Search by :

Download or read book The Electronics and Data Acquisition System of the DarkSide Dark Matter Search written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions.

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 1572 pages
Book Rating : 4.:/5 (31 download)

Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Task I

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (953 download)

Book Synopsis Task I by :

Download or read book Task I written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark Matter Search - During the period of performance, our group continued the search for dark matter in the form of weakly interacting massive particles or WIMPs. As a key member of the CDMS (Cryogenic Dark Matter Search) collaboration, we completed the CDMS II experiment which led the field in sensitivity for more than five years. We fabricated all detectors, and participated in detector testing and verification. In addition, we participated in the construction and operation of the facility at the Soudan Underground Laboratory and played key roles in the data acquisition and analysis. Towards the end of the performance period, we began operating the SuperCDMS Soudan experiment, which consists of 15 advanced Ge (9 kg) detectors. The advanced detector design called iZIP grew out of our earlier DOE Particle Detector R & D program which demonstrated the rejection of surface electrons to levels where they are no longer the dominant source of background. Our group invented this advanced design and these larger detectors were fabricated on the Stanford campus in collaboration with the SLAC CDMS group and the Santa Clara University group. The sensitivity reach is expected to be up to 5 times better than CDMS II after two years of operation. We will check the new limits on WIMPs set by XENON100, and we expect improved sensitivity for light mass WIMPs beyond that of any other existing experiment. Our group includes the Spokesperson for SuperCDMS and continues to make important contributions to improvements in the detector technology which are enabling the very low trigger thresholds used to explore the low mass WIMP region. We are making detailed measurements of the charge transport and trapping within Ge crystals, measuring the diffusive trapping distance of the quasiparticle excitations within the Al phonon collector fins on the detector surface, and we are contributing to the development of much improved detector Monte Carlos which are essential to guide the detector design and optimize the analysis. Neutrino Physics - In the period of performance the neutrino group successfully completed the construction of EXO-200 and commissioned the detector. Science data taking started on Jun 1, 2011. With the discovery of the 2-neutrino double-beta decay in 136-Xe and the first measurement of the 0-neutrino mode resulting in the most stringent limit of Majorana masses, our group continues to be a leading innovator in the field of neutrino physics which is central to DOE-HEP Intensity Frontier program. The phenomenon of neutrino oscillations, in part elucidated by our earlier efforts with the Palo Verde and KamLAND experiments, provides the crucial information that neutrino masses are non-zero and, yet, it contains no information on the value of the neutrino mass scale. In recent times our group has therefore shifted its focus to a high sensitivity 0-neutrino double beta decay program, EXO. The 0-neutrino double beta decay provides the best chance of extending the sensitivity to the neutrino mass scale below 10 meV but, maybe more importantly, it tests the nature of the neutrino wave function, providing the most sensitive probe for Majorana particles and lepton number violation. The EXO program, formulated by our group several years ago, plans to use up to tonnes of the isotope 136-Xe to study the 0-neutrino double beta decay mode. The EXO-200 detector is the first step in this program and it represents the only large US-led and based experiment taking data. The EXO-200 isotope enrichment program broke new grounds for the enterprise of double beta decay. The detector design and material selection program paid off, resulting in a background that is among the very best in the field. The "first light" of EXO-200 was very exciting with the discovery -in the first month of data- of the rarest 2-neutrino double beta decay mode ever observed. The lower limit on the 0-neutrino double beta decay half-life, published in Phys. Rev. Lett. and based on th ...

Commissioning the Miner Experiment to Take the First Low-background Data Using a Data Acquisition System from the SuperCDMS Dark Matter Search Experiment

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Author : Joseph Mammo
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)

Book Synopsis Commissioning the Miner Experiment to Take the First Low-background Data Using a Data Acquisition System from the SuperCDMS Dark Matter Search Experiment by : Joseph Mammo

Download or read book Commissioning the Miner Experiment to Take the First Low-background Data Using a Data Acquisition System from the SuperCDMS Dark Matter Search Experiment written by Joseph Mammo and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Multi-disciplinary Approach to Dark Matter Searches

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Author : Miguel Figueiredo Vaz Pato
Publisher :
ISBN 13 :
Total Pages : 185 pages
Book Rating : 4.:/5 (8 download)

Book Synopsis A Multi-disciplinary Approach to Dark Matter Searches by : Miguel Figueiredo Vaz Pato

Download or read book A Multi-disciplinary Approach to Dark Matter Searches written by Miguel Figueiredo Vaz Pato and published by . This book was released on 2011 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large portion of the present Universe is composed of a non-luminous kind of matter, which is intrinsically distinct from ail mass constituents known to exist. The evidence for this so-called Dark Matter spans sub-galactic to cosmological scales, and strongly suggests that it contributes around 80-85% of the matter content in our Universe. Over the past years, numerous experimental results relevant for Dark Matter searches have been released, triggering a great deal of excitement in the field. Moreover, plenty of data are expected in the near future. This thesis aims at linking Dark Matter models and their experimental signatures in current and upcoming detectors. As far as indirect Dark Matter detection is concerned, special attention is paid to the recently reported electron/positron excess in cosmic rays, which can in principle be explained by Dark Matter annihilations in our Galaxy. In order to test this possibility we perform a multi-messenger analysis combining the constraints from different astrophysical channels such as antiprotons, gamma-rays and radio signals. The uncertainties entering the computation of Dark Matter signatures are very significant and ultimately limit our ability to extract the properties of Dark Matter in case of discovery. Therefore, to assess and forecast ail relevant uncertainties is crucial, and a large portion o this thesis is devoted to that topic. In particular, we study the prospects for pinpointing cosmic-ray propagation with AMS-02, the systematic uncertainties regarding the local Dark Matter density and the effect of astrophysical unknowns on direct detection experiments.

Particle Dark Matter

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Author : Gianfranco Bertone
Publisher : Cambridge University Press
ISBN 13 : 0521763681
Total Pages : 763 pages
Book Rating : 4.5/5 (217 download)

Book Synopsis Particle Dark Matter by : Gianfranco Bertone

Download or read book Particle Dark Matter written by Gianfranco Bertone and published by Cambridge University Press. This book was released on 2010-01-07 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the dark matter problem in particle physics, astrophysics and cosmology for graduate students and researchers.

A Search for Wavelike Dark Matter with Dielectrically-loaded Multimode Cavities

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Author : Raphael Cervantes
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

Book Synopsis A Search for Wavelike Dark Matter with Dielectrically-loaded Multimode Cavities by : Raphael Cervantes

Download or read book A Search for Wavelike Dark Matter with Dielectrically-loaded Multimode Cavities written by Raphael Cervantes and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark matter makes up 85% of the matter in the universe and 27% of its energy density, but we don’t know what comprises dark matter. There are several compelling candidates for dark matter that have wavelike properties, including axions and dark photons. Wavelike dark matter can be detected using ultra-sensitive microwave cavities. The ADMX experiment usesa cylindrical cavity operating at the fundamental mode to search for axions in the few [microelectronvolt] mass range. However, the ADMX search technique becomes increasingly challenging with increasing axion mass. This is because higher masses require smaller-diameter cavities, and a smaller cavity volume reduces the signal strength. Thus, there is interest in developing more sophisticated resonators to overcome this problem. The ADMX-Orpheus experiment uses a dielectric-loaded Fabry-Perot cavity to search for axions and dark photons with masses approaching 100 [microelectronvolts]. Orpheus maintains a large volume by operating at a higher-order mode, and the dielectrics shape the electric field so that the mode couples more strongly to the axion and dark photon. This thesis describes the development and commissioning of ADMX-Orpheus to search for dark photons with masses between 65.5 [microelectronvolts] and 69.3 [microelectronvolts]. This thesis includes motivation for why dielectric cavities are suitable for detecting axions and dark photons around 100 [microelectronvolts]; the design and characterization of such a cavity, including the resonant frequency, quality factor, and detection volume of the mode of interest; the mechanical design, electronics, and data acquisition system for the Orpheus experiment; the inaugural search for dark photons 65.5 [microelectronvolts] and 69.3 [microelectronvolts]; and the resulting excluded parameter space; plans for upgrading Orpheus to search for axions in a similar mass range.

A Proposal for a Ton Scale Bubble Chamber for Dark Matter Detection

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Author :
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (727 download)

Book Synopsis A Proposal for a Ton Scale Bubble Chamber for Dark Matter Detection by :

Download or read book A Proposal for a Ton Scale Bubble Chamber for Dark Matter Detection written by and published by . This book was released on 2010 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature of non-baryonic dark matter is one of the most intriguing questions for particle physics at the start of the 21st century. There is ample evidence for its existence, but almost nothing is known of its properties. WIMPs are a very appealing candidate particle and several experimental campaigns are underway around the world to search for these particles via the nuclear recoils that they should induce. The COUPP series of bubble chambers has played a significant role in the WIMP search. Through a sequence of detectors of increasing size, a number of R & D issues have arisen and been solved, and the technology has now been advanced to the point where the construction of large chambers requires a modest research effort, some development, but mostly just engineering. It is within this context that we propose to build the next COUPP detector - COUPP-500, a ton scale device to be built over the next three years at Fermilab and then deployed deep underground at SNOLAB. The primary advantages of the COUPP approach over other technologies are: (1) The ability to reject electron and gamma backgrounds by arranging the chamber thermodynamics such that these particles do not even trigger the detector. (2) The ability to suppress neutron backgrounds by having the radioactively impure detection elements far from the active volume and by using the self-shielding of a large device and the high granularity to identify multiple bubbles. (3) The ability to build large chambers cheaply and with a choice of target fluids. (4) The ability to increase the size of the chambers without changing the size or complexity of the data acquisition. (5) Sensitivity to spin-dependent and spin-independent WIMP couplings. These key advantages should enable the goal of one background event in a ton-year of exposure to be achieved. The conceptual design of COUPP-500 is scaled from the preceding devices. In many cases all that is needed is a simple scaling up of components previously used. Calibration and R & D are still needed on some aspects of the system. We know we have the ability to distinguish alpha-induced events from nuclear recoils, but we do not yet know whether the combination of material purity and rejection are good enough to run for a year with no alpha background. We also need to have more detailed measurements of the detector threshold and a better understanding of its high gamma rejection. In addition, there are important checks to make on the longevity of the detector components in the hydraulic fluid and on the chemistry of the active fluid. The 2009 PASAG report explicitly supported the construction of the COUPP-500 device in all funding scenarios. The NSF has shown similar enthusiasm. It awarded one of its DUSEL S4 grants to assist in the engineering needed to build COUPP-500. The currently estimated cost of COUPP-500 is $8M, about half the $15M-$20M price tag expected by the PASAG report for a next generation dark matter search experiment. The COUPP-500 device will have a spin independent WIMP-nucleus cross-section sensitivity of 6 x 10−47 cm2 after a background-free year of running. This device should then provide the benchmark against which all other WIMP searches are measured.

Search for Dark Matter with ATLAS

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Author : Ruth Pöttgen
Publisher : Springer
ISBN 13 : 9783319410449
Total Pages : 0 pages
Book Rating : 4.4/5 (14 download)

Book Synopsis Search for Dark Matter with ATLAS by : Ruth Pöttgen

Download or read book Search for Dark Matter with ATLAS written by Ruth Pöttgen and published by Springer. This book was released on 2016-07-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1. Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.

INIS Atomindex

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Author :
Publisher :
ISBN 13 :
Total Pages : 794 pages
Book Rating : 4.:/5 (319 download)

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Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis

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Author : Caterina M. L. Marcon
Publisher :
ISBN 13 : 9789178958849
Total Pages : pages
Book Rating : 4.9/5 (588 download)

Book Synopsis Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis by : Caterina M. L. Marcon

Download or read book Development of New Approaches to ATLAS Detector Simulation and Dark Matter Searches with Trigger Level Analysis written by Caterina M. L. Marcon and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Elementary particles and their interactions are successfully described by the Standard Model of particle physics (SM). However, it has been observed that extensions Beyond the Standard Model (BSM) are required to account for a large part of yet undiscovered particles and interactions, such as Dark Matter (DM). To advance the knowledge of the SM and to pursue DM discoveries, CERN has the ambitious plan of further increasing the Large Hadron Collider's (LHC) energy and luminosity, thus reaching unprecedented event rates in the field of collider physics. This thesis is divided in three parts, dealing with some of the most challenging aspects of the ATLAS experiment at the LHC present and future activities. After a thorough review of the SM, BSM physics is outlined, with particular attention to DM searches. The second part of this work addresses the issue of coping with the foreseen event rates of the High-Luminosity LHC (HL-LHC) phase. Indeed, optimizations of the existing Geant4 simulation codes are a crucial step to alleviate the need for new and expensive hardware resources. With the objective of improving the efficiency of the simulation tools, an extensive study on different compilers, different optimization levels and different build types is presented. In addition, a preliminary investigation on the geometry description of the ATLAS Transition Radiation Tracker (TRT) modules is discussed. The last part of the thesis covers the DM searches carried out by the ATLAS Trigger-object Level Analysis (TLA) group. These searches are based on the analysis of the invariant mass spectrum of di-jet events and, during LHC Run 2, have been performed at energies in the 450-1800 GeV range (integrated luminosity up to 29.3 fb-1 and center of mass energy of 13 TeV). After a review of the TLA studies, a preliminary investigation on the performance of Bayesian and Frequentist statistical tools is presented. In particular, the attention is focused on the interpretation and handling of systematic uncertainties both on background and DM signals. This is of particular importance in the process of finding localized excesses, which can indicate the existence of DM signals, and setting limits on the DM event cross sections.

Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment

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Author : Kevin Ahmad McCarthy
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (865 download)

Book Synopsis Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment by : Kevin Ahmad McCarthy

Download or read book Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment written by Kevin Ahmad McCarthy and published by . This book was released on 2013 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astrophysical and cosmological measurements on the scales of galaxies, galaxy clusters, and the universe indicate that ~85% of the matter in the universe is composed of dark matter, made up of non-baryonic particles that interact with cross-sections on the weak scale or lower. Hypothetical Weakly Interacting Massive Particles, or WIMPs, represent a potential solution to the dark matter problem, and naturally arise in certain Standard Model extensions. The Cryogenic Dark Matter Search (CDMS) collaboration aims to detect the scattering of WIMP particles from nuclei in terrestrial detectors. Germanium and silicon particle detectors are deployed in the Soudan Underground Laboratory in Minnesota. These detectors are instrumented with phonon and ionization sensors, which allows for discrimination against electromagnetic backgrounds, which strike the detector at rates orders of magnitude higher than the expected WIMP signal. This dissertation presents the development of numerical models of the physics of the CDMS detectors, implemented in a computational package collectively known as the CDMS Detector Monte Carlo (DMC). After substantial validation of the models against data, the DMC is used to investigate potential backgrounds to the next iteration of the CDMS experiment, known as SuperCDMS. Finally, an investigation of using the DMC in a reverse Monte Carlo analysis of WIMP search data is presented. 140.23 kg-days of WIMP search data from the silicon detectors in the CDMSII experiment is also analyzed. The resulting upper limits on the WIMP-nucleon crosssection are higher than those published by other experiments at all WIMP masses, and the lowest limit on the WIMP-nucleon cross-section is 1.07*10-42 cm2 at a mass of 60 GeV/c2. These results do provide new and interesting constraints at WIMP masses

Large Scale U.S. Dark Matter Axion Search

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Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (871 download)

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Download or read book Large Scale U.S. Dark Matter Axion Search written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe the instrumentation and operations of the microwave cavity axion detector presently taking data at Lawrence Livermore National Laboratory This experiment, in collaboration of LLNL, MIT, Univ of Florida, LBNL, Univ of Chicago, FNAL, and INR/Moscow, has been operating with greater than 90% live time since February 1996 with the objective of exploring the region from 0 5 to 1 9 GHz (2 1 to 7 9 æeV) at greater than KSVZ sensitivitv In a com~ & on paper (E Daw) in these proceedings, the data analysis and Iirst results will be described (See also.

A Background-Subtracted Search for Annual Modulation in CDMS II

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Author : Danielle Speller
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (12 download)

Book Synopsis A Background-Subtracted Search for Annual Modulation in CDMS II by : Danielle Speller

Download or read book A Background-Subtracted Search for Annual Modulation in CDMS II written by Danielle Speller and published by . This book was released on 2017 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The identification of dark matter is one of the outstanding problems of our time. Cos- mological and astrophysical clues such as structure formation and relic densities, anomalous galaxy rotation curves, and mass density profiles provide ample evidence of an undetected mass component of the universe. Meanwhile, recent advancements in particle physics point toward extensions to the Standard Model, many of which posit candidates for new particles and new physics at the weak scale and beyond. If, as expected, the confluence of the hints of new physics in particle physics, astrophysics, and cosmology at the weak scale is more than coincidence, the detection of dark matter will pave the way for a paradigm shift in our fundamental understanding of the universe. Weakly interacting massive particles (WIMPs), in particular, are a well-motivated class of candidates for particle dark matter. Naturally predicted in supersymmetry (SUSY), WIMPs are stable, weakly-interacting, and produced in sufficient abundance to comprise the quantity of missing mass in a number of simple cases. Over the last two decades of experimentation, significant areas of the parameter space defined by the simplest SUSY theories have been ruled out, but WIMPs and related particles remain compelling candidates for dark matter searches. Several avenues for the detection and identification of dark matter are currently being pursued. The present work is a description of the search for a direct detection of super- symmetric dark matter via scattering from standard model particles. The Cryogenic Dark Matter Search (CDMS) Experiment uses ionization and athermal phonon sensor technolo- gies to achieve event-by-event discrimination of electron and nuclear recoils in cryogenic germanium crystal detectors. At low energies, where the the ability to discriminate individ- ual nuclear recoil events from background is reduced, a periodic variation of the rate and crossover signatures in the energy spectrum can aid the identification of a WIMP signature in the presence of significant backgrounds. In general, the direct detection of dark matter is the first step toward the identification and classification of dark matter in the universe. This work describes a background-subtracted search for annual modulation in the WIMP- search data acquired in the Cryogenic Dark Matter Search II (CDMS II) Experiment, which was the second implementation of the highly successful CDMS technology. We observe no significant modulation in the 2.7 keVnr to 11.9 keVnr (nuclear-recoil-equivalent) energy range selected for this analysis. These results are not compatible with a WIMP dark matter interpretation of the signals reported by the DAMA/LIBRA and CoGeNT experiments, and provide complementary support to earlier CDMS low-threshold germanium analyses.

International Aerospace Abstracts

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Author :
Publisher :
ISBN 13 :
Total Pages : 488 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1995 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: