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1. Muon-induced background in the EDELWEISS dark matter search

Author

The EDELWEISS collaboration, Schmidt, B., Armengaud, E., Augier, C., Benoit, A., Bergé, L., Bergmann, T., Blümer, J., Bres, G., Broniatowski, A., Brudanin, V., Censier, B., Chapellier, M., Charlieux, F., Collin, S., Coulter, P., Cox, G. A., Crauste, O., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Fourches, N., Garde, G., Gascon, J., Gerbier, G., Gros, M., Hehn, L., Henry, S., Hervé, S., Heuermann, G., Juillard, A., Kluck, H., Kozlov, V. Y., Kleifges, M., Kraus, H., Kudryavtsev, V. A., Loaiza, P., Marnieros, S., Menshikov, A., Navick, X. -F., Nieder, H., Nones, C., Olivieri, E., Pari, P., Paul, B., Robinson, M., Rodenas, H., Rozov, S., Sanglard, V., Siebenborn, B., Tcherniakhovski, D., Torrentó-Coello, A. S., Vagneron, L., Walker, R. J., Weber, M., Yakushev, E., Zhang, X., The EDELWEISS collaboration, Schmidt, B., Armengaud, E., Augier, C., Benoit, A., Bergé, L., Bergmann, T., Blümer, J., Bres, G., Broniatowski, A., Brudanin, V., Censier, B., Chapellier, M., Charlieux, F., Collin, S., Coulter, P., Cox, G. A., Crauste, O., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Fourches, N., Garde, G., Gascon, J., Gerbier, G., Gros, M., Hehn, L., Henry, S., Hervé, S., Heuermann, G., Juillard, A., Kluck, H., Kozlov, V. Y., Kleifges, M., Kraus, H., Kudryavtsev, V. A., Loaiza, P., Marnieros, S., Menshikov, A., Navick, X. -F., Nieder, H., Nones, C., Olivieri, E., Pari, P., Paul, B., Robinson, M., Rodenas, H., Rozov, S., Sanglard, V., Siebenborn, B., Tcherniakhovski, D., Torrentó-Coello, A. S., Vagneron, L., Walker, R. J., Weber, M., Yakushev, E., and Zhang, X.

Abstract

A dedicated analysis of the muon-induced background in the EDELWEISS dark matter search has been performed on a data set acquired in 2009 and 2010. The total muon flux underground in the Laboratoire Souterrain de Modane (LSM) was measured to be $\Phi_{\mu}=(5.4\pm 0.2 ^{+0.5}_{-0.9})$\,muons/m$^2$/d. The modular design of the muon-veto system allows the reconstruction of the muon trajectory and hence the determination of the angular dependent muon flux in LSM. The results are in good agreement with both MC simulations and earlier measurements. Synchronization of the muon-veto system with the phonon and ionization signals of the Ge detector array allowed identification of muon-induced events. Rates for all muon-induced events $\Gamma^{\mu}=(0.172 \pm 0.012)\, \rm{evts}/(\rm{kg \cdot d})$ and of WIMP-like events $\Gamma^{\mu-n} = 0.008^{+0.005}_{-0.004}\, \rm{evts}/(\rm{kg \cdot d})$ were extracted. After vetoing, the remaining rate of accepted muon-induced neutrons in the EDELWEISS-II dark matter search was determined to be $\Gamma^{\mu-n}_{\rm irred} < 6\cdot 10^{-4} \, \rm{evts}/(\rm{kg \cdot d})$ at 90%\,C.L. Based on these results, the muon-induced background expectation for an anticipated exposure of 3000\,\kgd\ for EDELWEISS-3 is $N^{\mu-n}_{3000 kg\cdot d} < 0.6$ events., Comment: 21 pages, 16 figures, Accepted for publication in Astropart. Phys

Published
2013
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2. Muon-induced background in the EDELWEISS dark matter search

Author

The EDELWEISS collaboration, Schmidt, B., Armengaud, E., Augier, C., Benoit, A., Bergé, L., Bergmann, T., Blümer, J., Bres, G., Broniatowski, A., Brudanin, V., Censier, B., Chapellier, M., Charlieux, F., Collin, S., Coulter, P., Cox, G. A., Crauste, O., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Fourches, N., Garde, G., Gascon, J., Gerbier, G., Gros, M., Hehn, L., Henry, S., Hervé, S., Heuermann, G., Juillard, A., Kluck, H., Kozlov, V. Y., Kleifges, M., Kraus, H., Kudryavtsev, V. A., Loaiza, P., Marnieros, S., Menshikov, A., Navick, X. -F., Nieder, H., Nones, C., Olivieri, E., Pari, P., Paul, B., Robinson, M., Rodenas, H., Rozov, S., Sanglard, V., Siebenborn, B., Tcherniakhovski, D., Torrentó-Coello, A. S., Vagneron, L., Walker, R. J., Weber, M., Yakushev, E., Zhang, X., The EDELWEISS collaboration, Schmidt, B., Armengaud, E., Augier, C., Benoit, A., Bergé, L., Bergmann, T., Blümer, J., Bres, G., Broniatowski, A., Brudanin, V., Censier, B., Chapellier, M., Charlieux, F., Collin, S., Coulter, P., Cox, G. A., Crauste, O., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Fourches, N., Garde, G., Gascon, J., Gerbier, G., Gros, M., Hehn, L., Henry, S., Hervé, S., Heuermann, G., Juillard, A., Kluck, H., Kozlov, V. Y., Kleifges, M., Kraus, H., Kudryavtsev, V. A., Loaiza, P., Marnieros, S., Menshikov, A., Navick, X. -F., Nieder, H., Nones, C., Olivieri, E., Pari, P., Paul, B., Robinson, M., Rodenas, H., Rozov, S., Sanglard, V., Siebenborn, B., Tcherniakhovski, D., Torrentó-Coello, A. S., Vagneron, L., Walker, R. J., Weber, M., Yakushev, E., and Zhang, X.

Abstract

A dedicated analysis of the muon-induced background in the EDELWEISS dark matter search has been performed on a data set acquired in 2009 and 2010. The total muon flux underground in the Laboratoire Souterrain de Modane (LSM) was measured to be $\Phi_{\mu}=(5.4\pm 0.2 ^{+0.5}_{-0.9})$\,muons/m$^2$/d. The modular design of the muon-veto system allows the reconstruction of the muon trajectory and hence the determination of the angular dependent muon flux in LSM. The results are in good agreement with both MC simulations and earlier measurements. Synchronization of the muon-veto system with the phonon and ionization signals of the Ge detector array allowed identification of muon-induced events. Rates for all muon-induced events $\Gamma^{\mu}=(0.172 \pm 0.012)\, \rm{evts}/(\rm{kg \cdot d})$ and of WIMP-like events $\Gamma^{\mu-n} = 0.008^{+0.005}_{-0.004}\, \rm{evts}/(\rm{kg \cdot d})$ were extracted. After vetoing, the remaining rate of accepted muon-induced neutrons in the EDELWEISS-II dark matter search was determined to be $\Gamma^{\mu-n}_{\rm irred} < 6\cdot 10^{-4} \, \rm{evts}/(\rm{kg \cdot d})$ at 90%\,C.L. Based on these results, the muon-induced background expectation for an anticipated exposure of 3000\,\kgd\ for EDELWEISS-3 is $N^{\mu-n}_{3000 kg\cdot d} < 0.6$ events., Comment: 21 pages, 16 figures, Accepted for publication in Astropart. Phys

Published
2013
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3. A multi-tiered data structure and process management system based on ROOT and CouchDB

Author

Cox, G, Armengaud, E, Augier, C, Benoit, A, Berge, L, Bergmann, T, Bluemer, J, Bres, G, Broniatowski, A, Brudanin, V, Censier, B, Chapellier, M, Chardin, G, Charlieux, F, Collin, S, Coulter, P, Crauste, O, De Jesus, M, Domange, J, Dumoulin, L, Eitel, K, Filosofov, D, Fourches, N, Gascon, J, Gerbier, G, Gironne, J, Gros, M, Henry, S, Herve, S, Jokisch, S, Juillard, A, Kleifges, M, Kluck, H, Kozlovg, V, Kraus, H, Kudryavtsev, V, Loaiza, P, Marnieros, S, Menshikov, A, Navick, X, Nones, C, Olivieri, E, Pari, P, Pattavina, L, Paul, B, Robinson, M, Rodenas, H, Rozov, S, Sanglard, V, Schmidt, B, Semikh, S, Tcherniakhovski, D, Torrento Coello, A, Unrau, M, Vagneron, L, Verdier, M, Walker, R, Weber, M, Yakushev, E, Zhang, X, Zhang, X., NONES, CLAUDIA, PATTAVINA, LUCA MARIA, Cox, G, Armengaud, E, Augier, C, Benoit, A, Berge, L, Bergmann, T, Bluemer, J, Bres, G, Broniatowski, A, Brudanin, V, Censier, B, Chapellier, M, Chardin, G, Charlieux, F, Collin, S, Coulter, P, Crauste, O, De Jesus, M, Domange, J, Dumoulin, L, Eitel, K, Filosofov, D, Fourches, N, Gascon, J, Gerbier, G, Gironne, J, Gros, M, Henry, S, Herve, S, Jokisch, S, Juillard, A, Kleifges, M, Kluck, H, Kozlovg, V, Kraus, H, Kudryavtsev, V, Loaiza, P, Marnieros, S, Menshikov, A, Navick, X, Nones, C, Olivieri, E, Pari, P, Pattavina, L, Paul, B, Robinson, M, Rodenas, H, Rozov, S, Sanglard, V, Schmidt, B, Semikh, S, Tcherniakhovski, D, Torrento Coello, A, Unrau, M, Vagneron, L, Verdier, M, Walker, R, Weber, M, Yakushev, E, Zhang, X, Zhang, X., NONES, CLAUDIA, and PATTAVINA, LUCA MARIA

Abstract

A multi-tiered data structure, analysis toolkit and data processing management system has been constructed using ROOT and CouchDB. This system is well suited for experiments that acquire many computer files of raw data over the course of months or years, that are distributed to different computing centers and further reduced in size by several steps of data processing. Data handling for experiments searching for rare events extracted from digitized pulse traces typically fit this description. An implementation of this system has been constructed for the EDELWEISS-III experiment and is described here in some detail. This solution may also serve as a prototype system for the proposed EURECA experiment. © 2012 Elsevier B.V. All rights reserved.

Published
2012

4. Monitoring of the thermal neutron flux in the LSM underground laboratory

Author

Rozov, S., Armengaud, E., Augier, C., Bergé, L., Benoit, A., Besida, O., Blümer, J., Broniatowski, A., Brudanin, V., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Defay, X., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrach, C., Marnieros, S., Navick, X-F., Nones, C., Olivieri, E., Pari, P., Paul, B., Sanglard, V., Scorza, S., Semikh, S., Verdier, M-A., Vagneron, L., Yakushev, E., Rozov, S., Armengaud, E., Augier, C., Bergé, L., Benoit, A., Besida, O., Blümer, J., Broniatowski, A., Brudanin, V., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Defay, X., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrach, C., Marnieros, S., Navick, X-F., Nones, C., Olivieri, E., Pari, P., Paul, B., Sanglard, V., Scorza, S., Semikh, S., Verdier, M-A., Vagneron, L., and Yakushev, E.

Abstract

This paper describes precise measurements of the thermal neutron flux in the LSM underground laboratory in proximity of the EDELWEISS-II dark matter search experiment together with short measurements at various other locations. Monitoring of the flux of thermal neutrons is accomplished using a mobile detection system with low background proportional counter filled with $^3$He. On average 75 neutrons per day are detected with a background level below 1 count per day (cpd). This provides a unique possibility of a day by day study of variations of the neutron field in a deep underground site. The measured average 4$\pi$ neutron flux per cm$^{2}$ in the proximity of EDELWEISS-II is $\Phi_{MB}=3.57\pm0.05^{stat}\pm0.27^{syst}\times 10^{-6}$ neutrons/sec. We report the first experimental observation that the point-to-point thermal neutron flux at LSM varies by more than a factor two., Comment: submitted to Journal of Physics G: Nuclear and Particle Physics, 8 pages, 4 figures

Published
2010

5. Monitoring of the thermal neutron flux in the LSM underground laboratory

Author

Rozov, S., Armengaud, E., Augier, C., Bergé, L., Benoit, A., Besida, O., Blümer, J., Broniatowski, A., Brudanin, V., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Defay, X., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrach, C., Marnieros, S., Navick, X-F., Nones, C., Olivieri, E., Pari, P., Paul, B., Sanglard, V., Scorza, S., Semikh, S., Verdier, M-A., Vagneron, L., Yakushev, E., Rozov, S., Armengaud, E., Augier, C., Bergé, L., Benoit, A., Besida, O., Blümer, J., Broniatowski, A., Brudanin, V., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Defay, X., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Filosofov, D., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrach, C., Marnieros, S., Navick, X-F., Nones, C., Olivieri, E., Pari, P., Paul, B., Sanglard, V., Scorza, S., Semikh, S., Verdier, M-A., Vagneron, L., and Yakushev, E.

Abstract

This paper describes precise measurements of the thermal neutron flux in the LSM underground laboratory in proximity of the EDELWEISS-II dark matter search experiment together with short measurements at various other locations. Monitoring of the flux of thermal neutrons is accomplished using a mobile detection system with low background proportional counter filled with $^3$He. On average 75 neutrons per day are detected with a background level below 1 count per day (cpd). This provides a unique possibility of a day by day study of variations of the neutron field in a deep underground site. The measured average 4$\pi$ neutron flux per cm$^{2}$ in the proximity of EDELWEISS-II is $\Phi_{MB}=3.57\pm0.05^{stat}\pm0.27^{syst}\times 10^{-6}$ neutrons/sec. We report the first experimental observation that the point-to-point thermal neutron flux at LSM varies by more than a factor two., Comment: submitted to Journal of Physics G: Nuclear and Particle Physics, 8 pages, 4 figures

Published
2010

6. A new high-background-rejection dark matter Ge cryogenic detector

Author

Broniatowski, A., Defay, X., Armengaud, E., Berge, L., Benoit, A., Besida, O., Blumer, J., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Herve, S., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrache, C., Marnieros, S., Navick, X. -F., Nones, C., Olivieri, E., Pari, P., Paul, B., Rozov, S., Sanglard, V., Scorza, S., Semikh, S., Verdier, M. -A., Vagneron, L., Yakushev, E., Broniatowski, A., Defay, X., Armengaud, E., Berge, L., Benoit, A., Besida, O., Blumer, J., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Herve, S., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrache, C., Marnieros, S., Navick, X. -F., Nones, C., Olivieri, E., Pari, P., Paul, B., Rozov, S., Sanglard, V., Scorza, S., Semikh, S., Verdier, M. -A., Vagneron, L., and Yakushev, E.

Abstract

A new design of a cryogenic germanium detector for dark matter search is presented, taking advantage of the coplanar grid technique of event localisation for improved background discrimination. Experiments performed with prototype devices in the EDELWEISS II setup at the Modane underground facility demonstrate the remarkably high efficiency of these devices for the rejection of low-energy $\beta$, approaching 10$^5$ . This opens the road to investigate the range beyond 10$^{-8}$ pb in the WIMP-nucleon collision cross-sections, as proposed in the EURECA project of a one-ton cryogenic detector mass., Comment: submitted to Physical Review Letters

Published
2009
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7. A new high-background-rejection dark matter Ge cryogenic detector

Author

Broniatowski, A., Defay, X., Armengaud, E., Berge, L., Benoit, A., Besida, O., Blumer, J., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Herve, S., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrache, C., Marnieros, S., Navick, X. -F., Nones, C., Olivieri, E., Pari, P., Paul, B., Rozov, S., Sanglard, V., Scorza, S., Semikh, S., Verdier, M. -A., Vagneron, L., Yakushev, E., Broniatowski, A., Defay, X., Armengaud, E., Berge, L., Benoit, A., Besida, O., Blumer, J., Chantelauze, A., Chapellier, M., Chardin, G., Charlieux, F., Collin, S., Crauste, O., De Jesus, M., Di Stefano, P., Dolgorouki, Y., Domange, J., Dumoulin, L., Eitel, K., Gascon, J., Gerbier, G., Gros, M., Hannawald, M., Herve, S., Juillard, A., Kluck, H., Kozlov, V., Lemrani, R., Lubashevskiy, A., Marrache, C., Marnieros, S., Navick, X. -F., Nones, C., Olivieri, E., Pari, P., Paul, B., Rozov, S., Sanglard, V., Scorza, S., Semikh, S., Verdier, M. -A., Vagneron, L., and Yakushev, E.

Abstract

A new design of a cryogenic germanium detector for dark matter search is presented, taking advantage of the coplanar grid technique of event localisation for improved background discrimination. Experiments performed with prototype devices in the EDELWEISS II setup at the Modane underground facility demonstrate the remarkably high efficiency of these devices for the rejection of low-energy $\beta$, approaching 10$^5$ . This opens the road to investigate the range beyond 10$^{-8}$ pb in the WIMP-nucleon collision cross-sections, as proposed in the EURECA project of a one-ton cryogenic detector mass., Comment: submitted to Physical Review Letters

Published
2009
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