Search

Your search keyword '"Gutlein A"' showing total 36 results
Start Over Author "Gutlein A"
36 results on '"Gutlein A"'

3. On-demand Simulation of Future Mobility Based on Apache Kafka

Author

Anatoli Djanatliev and Moritz Gutlein

Subjects
Service (systems architecture), Computer science, business.industry, Distributed computing, Simulation modeling, Big data, computer.software_genre, Clock synchronization, Set (abstract data type), Modeling and simulation, Stream processing, Middleware (distributed applications), business, computer
Abstract

The modeling and simulation community can benefit from building and running (co-)simulation models on-demand. In order to drive innovation further, it should be easy to set up, orchestrate, and execute simulations – even for researchers with no background in computer science. Additionally, open interfaces should be the default to enable a variety of applications. The possibility to connect external components smoothly with a simulation run allows for elaborate experiments. In this work, the details of the architecture and design of a simulation platform enabling evaluations of future mobility scenarios are presented. While the explanations are based on mobility applications, the concept can be generalized and applied to other domains. The novelty lies in the use of a big data stream processing platform called Apache Kafka. All kinds of required communication are handled by the Kafka middleware. Even the coupling of different simulators is realized on top of it. As a foundation, existing works regarding Modeling and Simulation as a Service are presented. The approach is then described by its architecture, its interfaces, and the life-cycle of a simulation run. Further information is given on the distribution of simulations and the topic-based clock synchronization mechanism. A performance evaluation shows that the approach is on one level with state-of-the art co-simulation middlewares.

Published
2021
Full Text
View/download PDF

4. Experimental Evaluation of the N-Ray Ground Interference Model

Author

Matthias Schafer, Reinhard German, Alexander Brummer, Moritz Gutlein, and Anatoli Djanatliev

Subjects
Line-of-sight, Vehicular ad hoc network, Computer science, Astrophysics::High Energy Astrophysical Phenomena, Measure (physics), Elevation, 020206 networking & telecommunications, 020302 automobile design & engineering, Terrain, 02 engineering and technology, Solid modeling, Interference (wave propagation), 0203 mechanical engineering, 0202 electrical engineering, electronic engineering, information engineering, Path loss, Algorithm, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

In this paper, we evaluate the n-ray ground interference model based on field experiments. The n-ray model is an extension of the popular two-ray interference model for three-dimensional Vehicular Ad Hoc Network (VANET) simulation. Using commodity hardware, we measure the path loss on nine selected test tracks and replay the scenarios simulatively to compare it to the simulated path loss resulting from the n-ray model. The simulation results are in good agreement with the measurements for the most parts in all nine cases, indicating that the n-ray ground interference model is able to capture the effect of ground reflections for arbitrary terrain shapes. The two-ray interference model fails to do so as it neglects elevation information. Moreover, the dependence of the results on the parameterization of the model as well as on the horizontal resolution of the underlying elevation dataset is investigated. In order to ensure that the n-ray model is only applied under Line of Sight (LOS) conditions, we further present a possible combination with our environmental diffraction model.

Published
2020
Full Text
View/download PDF

5. Performance Evaluation of HLA RTI Implementations

Author

Wojciech Baron, Christopher Renner, Anatoli Djanatliev, and Moritz Gutlein

Subjects
Portico, Payload, Computer science, 020209 energy, 0211 other engineering and technologies, 02 engineering and technology, computer.software_genre, High-level architecture, Computer architecture, Component (UML), Middleware (distributed applications), 021105 building & construction, 0202 electrical engineering, electronic engineering, information engineering, Implementation, computer
Abstract

The High Level Architecture is an IEEE standard that enables distributed simulation. There are several implementations of the standard, which are providing i.a. the Run-Time Infrastructure component. This paper compares the four most known RTI Implementations, namely MAK RTI, Pitch pRTI, Portico, and CERTI, with a focus on performance evaluation. In general, Pitch pRTI was the fastest implementation for most of our experiments. CERTI performed best for big payload sizes and Portico showed an interesting oscillation pattern.

Published
2020
Full Text
View/download PDF

9. Coupled Traffic Simulation by Detached Translation Federates: An HLA-Based Approach

Author

Moritz Gutlein and Anatoli Djanatliev

Subjects
Computer science, Distributed computing, Traffic simulation, 030206 dentistry, Transparency (human–computer interaction), 010501 environmental sciences, Translation (geometry), 01 natural sciences, 03 medical and health sciences, 0302 clinical medicine, High-level architecture, Order (exchange), Middleware, 0105 earth and related environmental sciences
Abstract

Typically, there is more than one possible answer to the question of how to model and simulate a problem. Combinations of different simulation paradigms and techniques are currently in vogue and potentially necessary to meet certain requirements. Besides clear advantages, model combinations tend to increase the complexity of the overall model building process. Even if different paradigms are coupled via a middleware, another use case might require reimplementing the connections. Additionally, users need increased effort to understand how the results have been generated in composed models. If it is not clear how data has been transformed from input to output, the trust in simulation is impaired. In order to counteract, a concept for reusable translation between submodels is proposed, leading to a better transparency regarding the data flows. We applied the High Level Architecture based approach to connect a macroscopic, a mesoscopic, and a microscopic traffic simulation.

Published
2019
Full Text
View/download PDF

10. Performance Gains in V2X Experiments Using Distributed Simulation in the Veins Framework

Author

Anatoli Djanatliev, Reinhard German, and Moritz Gutlein

Subjects
High-level architecture, Speedup, 0203 mechanical engineering, Computer science, Computation, Simulation modeling, Work (physics), 0202 electrical engineering, electronic engineering, information engineering, Traffic load, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Parallel computing
Abstract

The increasing precision in simulation models leads to a high computational effort. In general, parallel and distributed simulation is one technique to speed up a simulation to an acceptable runtime. Depending on the simulation model, the suitability of a parallel or distributed simulation varies. This applies also to coupled V2X simulations, where distributed computation may help to increase performance drastically. In this work, we identify opportunities and possibilities regarding distributed V2X simulations. Therefore, we describe and evaluate an approach to distribute multiple instances of the well-known Veins framework that are interacting and running concurrently. The instances are coupled using a hybrid co-simulation framework based on the High Level Architecture. With increasing traffic load, a higher speedup can be measured.

Published
2019
Full Text
View/download PDF

11. Sharing of Energy Among Cooperative Households Using Distributed Multi-Agent Reinforcement Learning

Author

Marco Pruckner, Moritz Gutlein, and Niklas Ebell

Subjects
Computer science, 020209 energy, Distributed computing, 05 social sciences, 050801 communication & media studies, 02 engineering and technology, Electrical grid, Energy storage, 0508 media and communications, Smart grid, 0202 electrical engineering, electronic engineering, information engineering, Reinforcement learning, Microgrid, Observability, Electric power, Information exchange
Abstract

Due to the increase of the complexity and uncertainty in the future sustainable energy system new control algorithms for decentralized acting energy entities are needed. We present an approach of distributed Reinforcement Learning in a multi-agent setup to find a control strategy of two cooperative agents within an energy cell. In order to practice energy sharing to decrease the energy cell's overall interdependence on the electrical grid, we train two independently learning agents, an energy storage and an electric power generator using Q-learning. We compare the learned strategy of the agents under partial and full observability of the environment and evaluate the interdependence of the energy cell on the electrical grid. Our results show that distributed Q-learning with independently learning agents works in the setup of an energy cell without the necessity of information exchange between agents. The algorithm under partial observability of the environment reaches comparable performance to that of full observability with fewer need of communication but at the cost of five times longer training time.

Published
2019
Full Text
View/download PDF

12. Elevation Estimation with a High Resolution Automotive Radar

Author

Stefan Brisken, Felix Hohne, and Johanna Gutlein-Holzer

Subjects
Azimuth, Interferometry, Dimension (vector space), Radar imaging, Automotive radar, Resolution (electron density), 0202 electrical engineering, electronic engineering, information engineering, Elevation, Range (statistics), 020206 networking & telecommunications, 02 engineering and technology, Geology, Remote sensing
Abstract

This paper demonstrates that interferometry is an effective means to provide elevation information in an automotive radar. Often discarded as yielding ‘no real resolution in elevation’, we display experimental results showing that high resolution in range, velocity and azimuth renders resolution in elevation dimension redundant.

Published
2019
Full Text
View/download PDF

13. Search for dark photons using data from CRESST-II Phase 2

Author

Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Understanding the nature and origin of dark matter is one of the most important challenges for modern particle physics. During the previous decade the sensitivities of direct dark matter searches have improved by several orders of magnitude. These experiments focus their work mainly on the search for dark-matter particles interacting with nuclei (e.g. Weakly Interacting Massive Particles, WIMPs). However, there exists a large variety of different candidates for dark-matter particles. One of these candidates, the so-called dark photon, is a long-lived vector boson with a kinetic mixing to the standard-model photon. In this work we present the preliminary results of our search for dark photons. Using data from the direct dark matter search CRESST-II Phase 2 we can improve the existing constraints for the kinetic mixing for dark-photon masses between 0.3 and 0.5 keV/c2. In addition, we also present projected sensitivities for the next phases of the CRESST-III experiment showing great potential to improve the sensitivity for dark-photon masses below 1 keV.

Published
2017

14. Dark-photon search using data from CRESST-II Phase 2

Author

Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Identifying the nature and origin of dark matter is one of the major challenges for modern astro and particle physics. Direct dark-matter searches aim at an observation of dark-matter particles interacting within detectors. The focus of several such searches is on interactions with nuclei as provided e.g. by weakly interacting massive particles. However, there is a variety of dark-matter candidates favoring interactions with electrons rather than with nuclei. One example are dark photons, i.e., long-lived vector particles with a kinetic mixing to standard-model photons. In this work we present constraints on this kinetic mixing based on data from CRESST-II Phase 2 corresponding to an exposure before cuts of 52 kg-days. These constraints improve the existing ones for dark-photon masses between 0.3 and 0.7 keV/c2.

Published
2017

15. Direct dark matter search with the CRESST-III experiment - status and perspectives

Author

Willers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gutlein, A, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Wustrich, M, Zoller, A, Willers M, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gutlein A, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Wustrich M, Zoller A, Willers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gutlein, A, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Wustrich, M, Zoller, A, Willers M, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gutlein A, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Wustrich M, and Zoller A

Abstract

The CRESST-III experiment, located in the Gran Sasso underground laboratory (LNGS, Italy), aims at the direct detection of dark matter (DM) particles. Scintillating CaWO4 crystals operated as cryogenic detectors are used as target material for DM-nucleus scattering. The simultaneous measurement of the phonon signal from the CaWO4 crystal and of the emitted scintillation light in a separate cryogenic light detector is used to discriminate backgrounds from a possible dark matter signal. The experiment aims to significantly improve the sensitivity for low-mass (less than or similar to 5-10 GeV/c(2)) DM particles by using optimized detector modules with a nuclear recoil-energy threshold less than or similar to 100 eV. The current status of the experiment as well as projections of the sensitivity for spin-independent DM-nucleon scattering will be presented.

Published
2017

21. The CRESST-III low-mass WIMP detector

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Krauss, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Krauss H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Krauss, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Krauss H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The next generation direct dark matter experiment CRESST-III has a high potential to significantly increase the sensitivity to low-mass WIMPs (mx ≲10GeV/c2). We present the new CRESST detector module: it consists of a 24 g CaWO4 crystal operated as a phonon detector and a 20×20 mm2 silicon-on-sapphire light detector. The phonon energy threshold is lowered to ∼100eV and a light detector resolution of typically 5eV is achieved. A fully-scintillating inner detector housing is realised which efficiently rejects events from surface-alpha decays. The CaWO4 sticks holding the target crystal are also operated as calorimeters to discriminate all possible artefacts related to the support structure. A projection for the sensitivity to spin-independent WIMP-nucleon scattering is given for the first phase of CRESST-III which will start beginning of 2016.

Published
2016

22. Exploring Low-Mass Dark Matter with CRESST

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II (Cryogenic Rare Event Search with Superconducting Thermometers) experiment, whose second phase has been successfully finished in summer 2015, aims at the direct detection of dark matter particles. The intrinsic radiopurity of CaWO4 crystals, the capability to reject recoil events from alpha-surface contamination, and the energy threshold were significantly improved compared to previous runs of the experiment. A moderate exposure of 29 kg-days acquired by one ∼ 250 g CaWO4 detector provides competitive limits on the spin-independent dark matter particle-nucleon cross section and probes a new region of parameter space for dark matter particle masses below 3 GeV/c2. The potential for low-mass dark matter particle search can be further exploited by a new detector design planned for CRESST-III. We describe the experimental strategy for the near future and give projections for the sensitivity.

Published
2016

23. Results on light dark matter particles with a low-threshold CRESST-II detector

Author

Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II experiment uses cryogenic detectors to search for nuclear recoil events induced by the elastic scattering of dark matter particles in CaWO4 crystals. Given the low energy threshold of our detectors in combination with light target nuclei, low mass dark matter particles can be probed with high sensitivity. In this letter we present the results from data of a single detector module corresponding to 52 kg live days. A blind analysis is carried out. With an energy threshold for nuclear recoils of 307 eV we substantially enhance the sensitivity for light dark matter. Thereby, we extend the reach of direct dark matter experiments to the sub- GeV/c2 region and demonstrate that the energy threshold is the key parameter in the search for low mass dark matter particles.

Published
2016

24. In-situ study of light production and transport in phonon light detector modules for dark matter search

Author

Kiefer, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Ferreiroiachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Kiefer M, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, FerreiroIachellini N, Gorla P, Gutlein A, Hauff D, Jochum J, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Kiefer, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Ferreiroiachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Kiefer M, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, FerreiroIachellini N, Gorla P, Gutlein A, Hauff D, Jochum J, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers) searches for dark matter via the phonon and light signals of elastic scattering processes in scintillating crystals. The discrimination between a possible dark matter signal and background is based on the light yield. We present a new method for evaluating the two characteristics of a phonon/light detector module that determine how much of the deposited energy is converted to scintillation light and how efficiently a module detects the produced light. In contrast to former approaches with dedicated setups, we developed a method which allows us to use data taken with the cryogenic setup, during a dark matter search phase. In this way, we accounted for the entire process that occurs in a detector module, and obtained information on the light emission of the crystal as well as information on the performance of the module (light transport and detection). We found that with the detectors operated in CRESST-II phase 1, about 20% of the produced scintillation light is detected. A part of the light is likely absorbed by creating meta-stable excitations in the scintillating crystals. The light not detected is not absorbed entirely, as an additional light detector can help to increase the fraction of detected light.

Published
2016

25. New results on low-mass dark matter from the CRESST-II experiment

Author

Petricca, F, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Petricca F, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Petricca, F, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Petricca F, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II experiment is searching for dark matter particles via their elastic scattering off nuclei in a target material. The CRESST target consists of scintillating CaW04 crystals which are operated as cryogenic calorimeters at millikelvin temperatures and read out by transition edge sensors. Each interaction in the CaW04 target crystal produces a phonon signal and also a light signal that is measured by a secondary cryogenic calorimeter. The low energy thresholds of these detectors, combined with the presence of light nuclei in the target material, allow to probe the low-mass region of the parameter space for spin-independent dark matter-nucleon scattering with high sensitivity. In this contribution results from a blind analysis of one detector module operated in the latest measurement campaign are presented. An unprecedented sensitivity for the light dark matter has been obtained with 52kg live days and a threshold of 307eV for nuclear recoils, extending the reach of direct dark matter searches to the sub-GeV/c2 region.

Published
2016

26. New limits on double electron capture of Ca-40 and W-180

Author

Angloher, G, Bauer, M, Bauer, P, Bavykina, I, Bento, A, Bucci, C, Canonica, L, Ciemniak, C, Defay, X, Deuter, G, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Huff, P, Isaila, C, Jochum, J, Kiefer, M, Kimmerle, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Pfister, S, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schmaler, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Tretyak, V, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer M, Bauer P, Bavykina I, Bento A, Bucci C, Canonica L, Ciemniak C, Defay X, Deuter G, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Huff P, Isaila C, Jochum J, Kiefer M, Kimmerle M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Pfister S, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schmaler J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Tretyak V, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bauer, M, Bauer, P, Bavykina, I, Bento, A, Bucci, C, Canonica, L, Ciemniak, C, Defay, X, Deuter, G, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Huff, P, Isaila, C, Jochum, J, Kiefer, M, Kimmerle, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Pfister, S, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schmaler, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Tretyak, V, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer M, Bauer P, Bavykina I, Bento A, Bucci C, Canonica L, Ciemniak C, Defay X, Deuter G, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Huff P, Isaila C, Jochum J, Kiefer M, Kimmerle M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Pfister S, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schmaler J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Tretyak V, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

We analyzed low-background data from the CRESST-II experiment with a total net exposure of 730 kg days to extract limits on double electron capture processes. We established new limits for 40Ca with T1/2 2v2K > 9.9 × 1021 y and T1/2 0v2EC > 1.4 × 1022 y and for 180W T1/2 2v/2K > 3.1 × 1019 with y and T1/2 0v2ED > 9.4 × 1018 y at 90% CL. Depending on the process, these values improve the currently best limits by a factor of ∼1.4-30.

Published
2016

27. Limits on Momentum-Dependent Asymmetric Dark Matter with CRESST-II

Author

Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The usual assumption in direct dark matter searches is to consider only the spin-dependent or spin-independent scattering of dark matter particles. However, especially in models with light dark matter particles O(GeV/c2), operators which carry additional powers of the momentum transfer q2 can become dominant. One such model based on asymmetric dark matter has been invoked to overcome discrepancies in helioseismology and an indication was found for a particle with a preferred mass of 3 GeV/c2 and a cross section of 10-37 cm2. Recent data from the CRESST-II experiment, which uses cryogenic detectors based on CaWO4 to search for nuclear recoils induced by dark matter particles, are used to constrain these momentum-dependent models. The low energy threshold of 307 eV for nuclear recoils of the detector used, allows us to rule out the proposed best fit value above.

Published
2016

29. Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Sivers MV, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Sivers MV, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The experiment CRESST`-II aims at the detection of dark matter with scintillating CaWO 4 crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST`-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c(2). This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO4 crystal, called TUM40, grown at the Technische Universitat Munchen. The average beta/gamma rate of 3.51/[kg keV day] (1-40 keV) and the total intrinsic alpha activity from natural decay chains of 3.08 +/- 0.04 mBq/kg are the lowest reported for CaWO4 detectors. Contributions from cosmogenic activation, surface-alpha decays, external radiation and intrinsic alpha/beta emitters are investigated in detail. A Monte-Carlo based background decomposition allows to identify the origin of the majority of beta/gamma events in the energy region relevant for dark matter search.

Published
2015

30. Impact of coherent neutrino nucleus scattering on direct dark matter searches based on CaWO4 crystals

Author

Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Proebst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaeffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Proebst F, Reindl F, Roth S, Rottler K, Sailer C, Schaeffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Proebst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaeffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Proebst F, Reindl F, Roth S, Rottler K, Sailer C, Schaeffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Atmospheric and solar neutrinos scattering coherently off target nuclei will be an important background source for the next generation of direct dark matter searches. In this work we focus on calcium tungstate as target material. For comparison with existing works we calculate the neutrino floor indicating which sensitivities can be reached before the neutrino background appears. In addition, we investigate the sensitivities of future direct dark matter searches using CRESST-II like detectors. Extending previous works we take into account achievable energy resolutions and thresholds as well as beta and gamma backgrounds for this investigation. We show that an exploration of WIMP-nucleon cross sections below the neutrino floor is possible for exposures of ≳10 kg-years. In the third part we show that a first detection of coherent neutrino nucleus scattering of atmospheric and solar neutrinos using the same detectors and the backgrounds is feasible for exposures of ≳50 kg-years.

Published
2015

31. Energy-dependent light quenching in CaWO4 crystals at mK temperatures

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Carli, W, Erb, A, von Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Hellgartner, D, Jochum, J, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Carli W, Erb A, von Feilitzsch F, Gorla P, Gutlein A, Hauff D, Hellgartner D, Jochum J, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Carli, W, Erb, A, von Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Hellgartner, D, Jochum, J, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Carli W, Erb A, von Feilitzsch F, Gorla P, Gutlein A, Hauff D, Hellgartner D, Jochum J, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Scintillating CaWO4 single crystals are a promising multi-element target for rare-event searches and are currently used in the direct dark matter experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers). The relative light output of different particle interactions in CaWO4 is quantified by quenching factors (QFs). These are essential for an active background discrimination and the identification of a possible signal induced by weakly interacting massive particles (WIMPs). We present the first precise measurements of the QFs of O, Ca and W at mK temperatures by irradiating a cryogenic detector with a fast neutron beam. A clear energy dependence of the QF of O and, less pronounced, of Ca was observed for the first time. Furthermore, in CRESST neutron-calibration data a variation of the QFs among different CaWO4 single crystals was found. For typical CRESST detectors the QFs in the region-of-interest (10-40 keV) are QF(O)(ROI) = (11.2 +/- 0.5) %, QF(Ca)(ROI) = (5.94 +/- 0.49)% andQF(W)(ROI) = (1.72 +/- 0.21) %. The latest CRESST data (run32) is reanalyzed using these fundamentally new results on light quenching in CaWO4 having moderate influence on the WIMP analysis. Their relevance for future CRESST runs and for the clarification of previously published results of direct dark matter experiments is emphasised.

Published
2014

32. Radiopurity of CaWO4 crystals for direct dark matter search with CRESST and EURECA

Author

Munster, A, Sivers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kraus, H, Lanfranchi, J, Laubenstein, M, Loebell, J, Ortigoza, Y, Petricca, F, Potzel, W, Probst, F, Puimedon, J, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Munster A, Sivers MV, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Gorla P, Gutlein A, Hauff D, Jochum J, Kraus H, Lanfranchi JC, Laubenstein M, Loebell J, Ortigoza Y, Petricca F, Potzel W, Probst F, Puimedon J, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Munster, A, Sivers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kraus, H, Lanfranchi, J, Laubenstein, M, Loebell, J, Ortigoza, Y, Petricca, F, Potzel, W, Probst, F, Puimedon, J, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Munster A, Sivers MV, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Gorla P, Gutlein A, Hauff D, Jochum J, Kraus H, Lanfranchi JC, Laubenstein M, Loebell J, Ortigoza Y, Petricca F, Potzel W, Probst F, Puimedon J, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The direct dark matter search experiment CRESST uses scintillating CaWO4 single crystals as targets for possible WIMP scatterings. An intrinsic radioactive contamination of the crystals as low as possible is crucial for the sensitivity of the detectors. In the past CaWO4 crystals operated in CRESST were produced by institutes in Russia and the Ukraine. Since 2011 CaWO4 crystals have also been grown at the crystal laboratory of the Technische Universitat Munchen (TUM) to better meet the requirements of CRESST and of the future tonne-scale multi-material experiment EURECA. The radiopurity of the raw materials and of first TUM-grown crystals was measured by ultra-low background gamma-spectrometry. Two TUM-grown crystals were also operated as low-temperature detectors at a test setup in the Gran Sasso underground laboratory. These measurements were used to determine the crystals' intrinsic alpha-activities which were compared to those of crystals produced at other institutes. The total alpha-activities of TUM-grown crystals as low as 1 : 23 +/- 0 : 06 mBq/kg were found to be significantly smaller than the activities of crystals grown at other institutes typically ranging between similar to 15 mBq/kg and similar to 35 mBq/kg.

Published
2014

33. Multi-channel MMW-systems for short range applications

Author

Sebastian Bertl, Johanna Gutlein, Jürgen Detlefsen, and Andreas Kirschner

Subjects
Continuous-wave radar, Computer science, Small antenna, Radar imaging, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Computer Science::Networking and Internet Architecture, Baseband, Calibration, Range (statistics), Electronic engineering, Systems architecture, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Multi channel
Abstract

Millimeter-wave (mmW) sensorics are an interesting option for several short range applications like the imaging of persons or the monitoring of indoor environments. Due to the small antenna dimensions, compact sensor setups can be realised. This paper will discuss different setups for mmW-sensors based on the principle of a frequency-modulated continuous wave radar with respect to system architecture, calibration concepts, resulting sensor capabilities and imaging results.

Published
2012
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results