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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.
Nucleon Decay Searches with large Liquid Argon TPC Detectors at Shallow Depths: atmospheric neutrinos and cosmogenic backgrounds
Bueno, A.;Dai, Z.;Ge, Y.;Laffranchi, M.;Melgarejo, A. J.;Meregaglia, A.;Navas, S.;Rubbia, A.
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1126-6708/2007/04/041
Abstract: Grand Unification of the strong, weak and electromagnetic interactions into a single unified gauge group is an extremely appealing idea which has been vigorously pursued theoretically and experimentally for many years. The detection of proton or bound-neutron decays would represent its most direct experimental evidence. In this context, we studied the physics potentialities of very large underground Liquid Argon Time Projection Chambers (LAr TPC). We carried out a detailed simulation of signal efficiency and background sources, including atmospheric neutrinos and cosmogenic backgrounds. We point out that a liquid Argon TPC, offering good granularity and energy resolution, low particle detection threshold, and excellent background discrimination, should yield very good signal over background ratios in many possible decay modes, allowing to reach partial lifetime sensitivities in the range of $10^{34}-10^{35}$ years with exposures up to 1000 kton$\times$year, often in quasi-background-free conditions optimal for discoveries at the few events level, corresponding to atmospheric neutrino background rejections of the order of $10^5$. Multi-prong decay modes like e.g. $p\to \mu^- \pi^+ K^+$ or $p\to e^+\pi^+\pi^-$ and channels involving kaons like e.g. $p\to K^+\bar\nu$, $p\to e^+K^0$ and $p\to \mu^+K^0$ are particularly suitable, since liquid Argon imaging (...)
DarkSide50 results from first argon run  [PDF]
D. D'Angelo,for the DarkSide Collaboration
Physics , 2015,
Abstract: DarkSide (DS) at Gran Sasso underground laboratory is a direct dark matter search program based on TPCs with liquid argon from underground sources. The DS-50 TPC, with 50 kg of liquid argon is installed inside active neutron and muon detectors. DS-50 has been taking data since Nov 2013, collecting more than 10^7 events with atmospheric argon. This data represents an exposure to the largest background, beta decays of 39Ar, comparable to the full 3 y run of DS-50 with underground argon. When analysed with a threshold that would give a sensitivity in the full run of about 10^-45 cm2 at a WIMP mass of 100 GeV, there is no 39Ar background observed. We present the detector design and performance, the results from the atmospheric argon run and plans for an upscale to a multi-ton detector along with its sensitivity.
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.
Study of accelerator neutrino interactions in a liquid argon TPC  [PDF]
A. Martinez de la Ossa
Physics , 2007,
Abstract: We study the potentialities of a 50 liter liquid argon TPC prototype operated at the CERN WANF neutrino beam. We concentrate on the selection and reconstruction of quasi-elastic events and measure the cross section for this reaction.
The ArDM project: a Liquid Argon TPC for Dark Matter Detection
Laffranchi, M.;Rubbia, A.
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1742-6596/65/1/012014
Abstract: WIMPs (Weakly Interacting Massive Particles) are considered the main candidates for Cold Dark Matter. The ArDM experiment aims at measuring signals directly induced by WIMPs in liquid argon. A 1-ton prototype is currently developed with the goal of demonstrating the feasibility and performance of a detector with such a large target mass. ArDM aims at acting as a liquid argon TPC and additionally measuring the scintillation light. The principle of the experiment and the conceptual design of the detector are described.
Test of a Liquid Argon TPC in a magnetic field and investigation of high temperature superconductors in liquid argon and nitrogen  [PDF]
A. Badertscher,L. Knecht,M. Laffranchi,G. Natterer,A. Rubbia,Th. Strauss
Physics , 2010, DOI: 10.1088/1742-6596/308/1/012026
Abstract: Tests with cosmic ray muons of a small liquid argon time projection chamber (LAr TPC) in a magnetic field of 0.55 T are described. No effect of the magnetic field on the imaging properties were observed. In view of a future large, magnetized LAr TPC, we investigated the possibility to operate a high temperature superconducting (HTS) solenoid directly in the LAr of the detector. The critical current $I_c$ of HTS cables in an external magnetic field was measured at liquid nitrogen and liquid argon temperatures and a small prototype HTS solenoid was built and tested.
A tagged low-momentum kaon test-beam exposure with a 250L LAr TPC (J-PARC T32)  [PDF]
O. Araoka,A. Badertscher,A. Curioni,S. DiLuise,U. Degunda,L. Epprecht,L. Esposito,A. Gendotti,T. Hasegawa,S. Horikawa,K. Kasami,N. Kimura,L. Knecht,T. Kobayashi,C. Lazzaro,D. Lussi,M. Maki,A. Marchionni,T. Maruyama,A. Meregaglia,T. Mitani,Y. Nagasaka,J. Naganoma,H. Naito,S. Narita,G. Natterer,K. Nishikawa,A. Okamoto,H. Okamoto,F. Petrolo,F. Resnati,A. Rubbia,C. Strabel,M. Tanaka,T. Viant,Y. Yamanoi,K. Yorita,M. Yoshioka
Physics , 2011,
Abstract: At the beginning of 2010, we presented at the J-PARC PAC an R$&$D program towards large (100 kton scale) liquid argon TPCs, suitable to investigate, in conjunction with the J-PARC neutrino beam, the possibility of CP violation in the neutrino sector and to search for nucleon decay. As a first step we proposed a test experiment to identify and measure charged kaons, including their decays, in liquid argon. The detector, a 250L LAr TPC, is exposed to charged kaons, in a momentum range of 540-800 MeV/c, in the K1.1BR beamline of the J-PARC slow extraction facility. This is especially important to estimate efficiency and background for nucleon decay searches in the charged kaon mode ($p \rightarrow \bar{\nu} K^+$, etc.), where the kaon momentum is expected to be in the few hundred MeV/c range. A prototype setup has been exposed in the K1.1BR beamline in the fall of 2010. This paper describes the capabilities of the beamline, the construction and setting up of the detector prototype, along with some preliminary results.
The PANDA GEM-based TPC Prototype  [PDF]
L. Fabbietti,H. Angerer,R. Beck,M. Berger,F. B?hmer,K. T. Brinkmann,P. Bühler,M. Danner,S. D\orheim,C. Funke,F. Cusanno,J. Hehner,A. Heinz,M. Henske,C. H?ppner,D. Kaiser,B. Ketzer,I. Konorov,J. Kunkel,M. Lang,J. Marton,S. Neubert,S. Paul,A. Schmah,C. Schmidt,R. Schmitz,S. Schwab,D. Soyk,K. Suzuki,U. Thoma,M. Vandenbroucke,B. Voss,D. Walter,Q. Weitzel,E. Widmann,A. Winnebeck,L. W?rner,H. G. Zaunick,X. Zhang,J. Zmeskal
Physics , 2010, DOI: 10.1016/j.nima.2010.06.317
Abstract: We report on the development of a GEM-based TPC prototype for the PANDA experiment. The design and requirements of this device will be illustrated, with particular emphasis on the properties of the recently tested GEM-detector, the characterization of the read-out electronics and the development of the tracking software that allows to evaluate the GEM-TPC data.
Beam Test with a GridGEM TPC Prototype Module  [PDF]
Ralf Diener,Ties Behnke,Stefano Caiazza,Isa Heinze,Volker Prahl,Christoph Rosemann,Oliver Sch?fer,Jan Timmermans,Robert Volkenborn,Klaus Zenker
Physics , 2012,
Abstract: The International Large Detector (ILD) --a detector concept for the International Linear Collider (ILC)-- foresees a Time Projection Chamber (TPC) as its main tracking detector. Currently, the R&D efforts for such a TPC focus on studies using a large prototype that can accommodate up to seven read-out modules which are comparable to the ones that would be used in the final ILD TPC. The DESY TPC group has developed such a module using GEMs for the gas amplification, which are mounted on thin ceramic frames. The module design and first results of a test beam campaign are presented.
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