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Data acquisition electronics and reconstruction software for directional detection of Dark Matter with MIMAC  [PDF]
O. Bourrion,G. Bosson,C. Grignon,J. L. Bouly,J. P. Richer,O. Guillaudin,F. Mayet,D. Santos
Physics , 2010, DOI: 10.1016/j.nima.2010.07.035
Abstract: Directional detection of galactic Dark Matter requires 3D reconstruction of low energy nuclear recoils tracks. A dedicated acquisition electronics with auto triggering feature and a real time track reconstruction software have been developed within the framework of the MIMAC project of detector. This auto-triggered acquisition electronic uses embedded processing to reduce data transfer to its useful part only, i.e. decoded coordinates of hit tracks and corresponding energy measurements. An acquisition software with on-line monitoring and 3D track reconstruction is also presented.
Low radioactivity argon dark matter search results from the DarkSide-50 experiment  [PDF]
The DarkSide Collaboration,P. Agnes,L. Agostino,I. F. M. Albuquerque,T. Alexander,A. K. Alton,K. Arisaka,H. O. Back,B. Baldin,K. Biery,G. Bonfini,M. Bossa,B. Bottino,A. Brigatti,J. Brodsky,F. Budano,S. Bussino,M. Cadeddu,L. Cadonati,M. Cadoni,F. Calaprice,N. Canci,A. Candela,H. Cao,M. Cariello,M. Carlini,S. Catalanotti,P. Cavalcante,A. Chepurnov,A. G. Cocco,G. Covone,L. Crippa,D. D'Angelo,M. D'Incecco,S. Davini,S. De Cecco,M. De Deo,M. De Vincenzi,A. Derbin,A. Devoto,F. Di Eusanio,G. Di Pietro,E. Edkins,A. Empl,A. Fan,G. Fiorillo,K. Fomenko,G. Forster,D. Franco,F. Gabriele,C. Galbiati,C. Giganti,A. M. Goretti,F. Granato,L. Grandi,M. Gromov,M. Guan,Y. Guardincerri,B. R. Hackett,K. Herner,E. V. Hungerford,Al. Ianni,An. Ianni,I. James,C. Jollet,K. Keeter,C. L. Kendziora,V. Kobychev,G. Koh,D. Korablev,G. Korga,A. Kubankin,X. Li,M. Lissia,P. Lombardi,S. Luitz,Y. Ma,I. N. Machulin,A. Mandarano,S. M. Mari,J. Maricic,L. Marini,C. J. Martoff,A. Meregaglia,P. D. Meyers,T. Miletic,R. Milincic,D. Montanari,A. Monte,M. Montuschi,M. Monzani,P. Mosteiro,B. J. Mount,V. N. Muratova,P. Musico,J. Napolitano,A. Nelson,S. Odrowski,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,S. Parmeggiano,K. Pelczar,N. Pelliccia,S. Perasso,A. Pocar,S. Pordes,D. A. Pugachev,H. Qian,K. Randle,G. Ranucci,A. Razeto,B. Reinhold,A. L. Renshaw,A. Romani,B. Rossi,N. Rossi,D. Rountree,D. Sablone,P. Saggese,R. Saldanha,W. Sands,S. Sangiorgio,C. Savarese,E. Segreto,D. A. Semenov,E. Shields,P. N. Singh
Physics , 2015,
Abstract: The DarkSide-50 dark matter search reports the first results obtained using a target of low-radioactivity argon extracted from underground sources. The experiment is located at the Laboratori Nazionali del Gran Sasso and uses a two-phase time projection chamber as a detector. A total of 155 kg of low radioactivity argon has been obtained, and we have determined that underground argon is depleted in Ar-39 by a factor (1.4 +- 0.2) x 10^3 relative to atmospheric argon. The underground argon is also found to contain (2.05 +- 0.13) mBq/kg of Kr-85. We find no evidence for dark matter in the form of WIMPs in 70.9 live-days of data with a fiducial mass of (36.9 +- 0.6) kg. When combined with our preceding search with an atmospheric argon target, we set a 90 % C.L. upper limit on the WIMP-nucleon spin-independent cross section of 2.0 x 10^-44 cm^2 (8.6 x 10^-44 cm^2, 8.0 x 10^-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2 , 10 TeV/c^2).
Status and Results from DarkSide-50  [PDF]
Alden Fan,for the DarkSide Collaboration
Physics , 2015,
Abstract: DarkSide-50 is the first physics detector of the DarkSide dark matter search program. The detector features a dual-phase underground-argon Time Projection Chamber (TPC) of 50 kg active mass surrounded by an organic liquid-scintillator neutron veto (30 tons) and a water-Cherenkov muon detector (1000 tons). The TPC is currently fully shielded and operating underground at Gran Sasso National Laboratory. A first run of 1422 kg-day exposure with atmospheric argon represents the most sensitive dark matter search using a liquid argon target. The TPC is now filled with underground argon, greatly reduced in 39Ar, and DarkSide-50 is in its final configuration for an extended dark matter search. Overviews of the design, performance, and results obtained so far with DarkSide-50 will be presented, along with future prospects for the DarkSide program.
A FLUKA Study of $β$-delayed Neutron Emission for the Ton-size DarkSide Dark Matter Detector  [PDF]
Anton Empl,Ed V. Hungerford
Physics , 2014,
Abstract: In the published cosmogenic background study for a ton-sized DarkSide dark matter search, only prompt neutron backgrounds coincident with cosmogenic muons or muon induced showers were considered, although observation of the initiating particle(s) was not required. The present paper now reports an initial investigation of the magnitude of cosmogenic background from $\beta$-delayed neutron emission produced by cosmogenic activity in DarkSide. The study finds a background rate for $\beta$-delayed neutrons in the fiducial volume of the detector on the order of < 0.1 event/year. However, detailed studies are required to obtain more precise estimates. The result should be compared to a radiogenic background event rate from the PMTs inside the DarkSide liquid scintillator veto of 0.2 events/year.
Instrumentation, acquisition and analysis of the Phase II SIMPLE dark matter search signals  [PDF]
M. Felizardo
Physics , 2011,
Abstract: I describe the new instrumentation for the SIMPLE dark matter search experiment, and its use in identifying, validating and rejecting non-WIMP backgrounds in the first stage of the Phase II project measurements. Beyond intrinsic acoustic background discrimination, evidence is provided for discrimination between {\alpha}- and neutron-induced events via analysis of the signal parameters. Analysis of the first stage result of the Phase II measurements yields 14 events associated with the ambient neutron field, consistent with MCNP simulations which include all materials radio-assays and full measurement shielding.
First Results from the DarkSide-50 Dark Matter Experiment at Laboratori Nazionali del Gran Sasso  [PDF]
P. Agnes,T. Alexander,A. Alton,K. Arisaka,H. O. Back,B. Baldin,K. Biery,G. Bonfini,M. Bossa,A. Brigatti,J. Brodsky,F. Budano,L. Cadonati,F. Calaprice,N. Canci,A. Candela,H. Cao,M. Cariello,P. Cavalcante,A. Chavarria,A. Chepurnov,A. G. Cocco,L. Crippa,D. D'Angelo,M. D'Incecco,S. Davini,M. De Deo,A. Derbin,A. Devoto,F. Di Eusanio,G. Di Pietro,E. Edkins,A. Empl,A. Fan,G. Fiorillo,K. Fomenko,G. Forster,D. Franco,F. Gabriele,C. Galbiati,A. Goretti,L. Grandi,M. Gromov,M. Y. Guan,Y. Guardincerri,B. Hackett,K. Herner,E. V. Hungerford,Al. Ianni,An. Ianni,C. Jollet,K. Keeter,C. Kendziora,S. Kidner,V. Kobychev,G. Koh,D. Korablev,G. Korga,A. Kurlej,P. X. Li,B. Loer,P. Lombardi,C. Love,L. Ludhova,S. Luitz,Y. Q. Ma,I. Machulin,A. Mandarano,S. Mari,J. Maricic,L. Marini,C. J. Martoff,A. Meregaglia,E. Meroni,P. D. Meyers,R. Milincic,D. Montanari,A. Monte,M. Montuschi,M. E. Monzani,P. Mosteiro,B. Mount,V. Muratova,P. Musico,A. Nelson,S. Odrowski,M. Okounkova,M. Orsini,F. Ortica,L. Pagani,M. Pallavicini,E. Pantic,L. Papp,S. Parmeggiano,R. Parsells,K. Pelczar,N. Pelliccia,S. Perasso,A. Pocar,S. Pordes,D. Pugachev,H. Qian,K. Randle,G. Ranucci,A. Razeto,B. Reinhold,A. Renshaw,A. Romani,B. Rossi,N. Rossi,S. D. Rountree,D. Sablone,P. Saggese,R. Saldanha,W. Sands,S. Sangiorgio,E. Segreto,D. Semenov,E. Shields,M. Skorokhvatov,O. Smirnov,A. Sotnikov,C. Stanford,Y. Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Tonazzo,E. Unzhakov,R. B. Vogelaar,M. Wada,S. Walker,H. Wang,Y. Wang,A. Watson
Physics , 2014, DOI: 10.1016/j.physletb.2015.03.012
Abstract: We report the first results of DarkSide-50, a direct search for dark matter operating in the underground Laboratori Nazionali del Gran Sasso (LNGS) and searching for the rare nuclear recoils possibly induced by weakly interacting massive particles (WIMPs). The dark matter detector is a Liquid Argon Time Projection Chamber with a (46.4+-0.7) kg active mass, operated inside a 30 t organic liquid scintillator neutron veto, which is in turn installed at the center of a 1 kt water Cherenkov veto for the residual flux of cosmic rays. We report here the null results of a dark matter search for a (1422+-67) kg d exposure with an atmospheric argon fill. This is the most sensitive dark matter search performed with an argon target, corresponding to a 90% CL upper limit on the WIMP-nucleon spin-independent cross section of 6.1x10^-44 cm^2 for a WIMP mass of 100 GeV/c^2.
Comments on "A Dark Matter Search with MALBEK"  [PDF]
J. I. Collar
Physics , 2014,
Abstract: CoGeNT and MALBEK use p-type point contact germanium detectors to search for low-mass dark matter particles. Both detectors enjoy identical intrinsic noise characteristics. However, MALBEK's data acquisition electronics severely degrade the ability to separate signals originating in the bulk of the germanium crystal from surface backgrounds, through a measurement of the preamplifier pulse rise-time in the sub-keVee energy range of interest. The physical meaning of the parameter W$_{par}$ developed by the MAJORANA collaboration to compensate for this limitation is clarified here. It is shown that this parameter does not correlate to rise-time at low energy, and is presently unable to distinguish between surface and bulk events below $\sim$1 keVee. This leads to a sizable overstatement of MALBEK's sensitivity to low-mass dark matter particles, when employing aggressive W$_{par}$ cuts.
The DarkSide Program at LNGS  [PDF]
Alex Wright,for the DarkSide Collaboration
Physics , 2011,
Abstract: DarkSide is a direct detection dark matter program based on two phase time projection chambers with depleted argon targets. The DarkSide detectors are designed, using novel low background techniques and active shielding, to be capable of demonstrating in situ a very low level of residual background. This means that each detector in the DarkSide program should have the ability to make a convincing claim of dark matter detection based on the observation of a few nuclear recoil events. The collaboration is currently operating a 10 kg prototype detector, DarkSide-10, in Laboratori Nazionali del Gran Sasso, Italy, while the first physics detector in the program, DarkSide-50, is expected to be deployed at LNGS at the end of 2012.
Light Yield in DarkSide-10: a Prototype Two-phase Liquid Argon TPC for Dark Matter Searches  [PDF]
T. Alexander,D. Alton,K. Arisaka,H. O. Back,P. Beltrame,J. Benziger,G. Bonfini,A. Brigatti,J. Brodsky,L. Cadonati,F. Calaprice,A. Candela,H. Cao,P. Cavalcante,A. Chavarria,A. Chepurnov,D. Cline,A. G. Cocco,C. Condon,D. D'Angelo,S. Davini,E. De Haas,A. Derbin,G. Di Pietro,I. Dratchnev,D. Durben,A. Empl,A. Etenko,A. Fan,G. Fiorillo,K. Fomenko,F. Gabriele,C. Galbiati,S. Gazzana,C. Ghag,C. Ghiano,A. Goretti,L. Grandi,M. Gromov,M. Guan,C. Guo,G. Guray,E. V. Hungerford,Al. Ianni,An. Ianni,A. Kayunov,K. Keeter,C. Kendziora,S. Kidner,V. Kobychev,G. Koh,D. Korablev,G. Korga,E. Shields,P. Li,B. Loer,P. Lombardi,C. Love,L. Ludhova,L. Lukyanchenko,A. Lund,K. Lung,Y. Ma,I. Machulin,J. Maricic,C. J. Martoff,Y. Meng,E. Meroni,P. D. Meyers,T. Mohayai,D. Montanari,M. Montuschi,P. Mosteiro,B. Mount,V. Muratova,A. Nelson,A. Nemtzow,N. Nurakhov,M. Orsini,F. Ortica,M. Pallavicini,E. Pantic,S. Parmeggiano,R. Parsells,N. Pelliccia,L. Perasso,F. Perfetto,L. Pinsky,A. Pocar,S. Pordes,G. Ranucci,A. Razeto,A. Romani,N. Rossi,P. Saggese,R. Saldanha,C. Salvo,W. Sands,M. Seigar,D. Semenov,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Teymourian,J. Thompson,E. Unzhakov,R. B. Vogelaar,H. Wang,S. Westerdale,M. Wojcik,A. Wright,J. Xu,C. Yang,S. Zavatarelli,M. Zehfus,W. Zhong,G. Zuzel
Physics , 2012, DOI: 10.1016/j.astropartphys.2013.08.004
Abstract: As part of the DarkSide program of direct dark matter searches using liquid argon TPCs, a prototype detector with an active volume containing 10 kg of liquid argon, DarkSide-10, was built and operated underground in the Gran Sasso National Laboratory in Italy. A critically important parameter for such devices is the scintillation light yield, as photon statistics limits the rejection of electron-recoil backgrounds by pulse shape discrimination. We have measured the light yield of DarkSide-10 using the readily-identifiable full-absorption peaks from gamma ray sources combined with single-photoelectron calibrations using low-occupancy laser pulses. For gamma lines of energies in the range 122-1275 keV, we get consistent light yields averaging 8.887+-0.003(stat)+-0.444(sys) p.e./keVee. With additional purification, the light yield measured at 511 keV increased to 9.142+-0.006(stat) p.e./keVee.
Data acquisition electronics and reconstruction software for real time 3D track reconstruction within the MIMAC project  [PDF]
O. Bourrion,G. Bosson,C. Grignon,J. L. Bouly,J. P. Richer,O. Guillaudin,F. Mayet,J. Billard,D. Santos
Physics , 2011, DOI: 10.1088/1748-0221/6/11/C11003
Abstract: Directional detection of non-baryonic Dark Matter requires 3D reconstruction of low energy nuclear recoils tracks. A gaseous micro-TPC matrix, filled with either 3He, CF4 or C4H10 has been developed within the MIMAC project. A dedicated acquisition electronics and a real time track reconstruction software have been developed to monitor a 512 channel prototype. This autotriggered electronic uses embedded processing to reduce the data transfer to its useful part only, i.e. decoded coordinates of hit tracks and corresponding energy measurements. An acquisition software with on-line monitoring and 3D track reconstruction is also presented.
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