Status of the ArDM Experiment: First results from gaseous argon operation in deep underground environment

Collaboration, ArDM; Badertscher, A.; Bay, F.; Bourgeois, Nicolas; Cantini, C.; Daniel, M. K.; Degunda, U.; DiLuise, S.; Epprecht, L.; Gendotti, A.; Horikawa, S.; Knecht, L.; Lussi, D.; Maire, G.; Montès, B.; Murphy, S.; Natterer, G.; Nikolics, K.; Nguyen, K.; Periale, L.; Ravat, S.; Resnati, F.; Romero, Luis Monsonis; Rubbia, A.; Santorelli, R.; Sergiampietri, F.; Sgalaberna, D.; Viant, T.; Wu, S.

doi:10.48550/arxiv.1307.0117

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…LAr is used in several experiments for the direct Dark Matter detection mainly because it allows to reject efficiently γ and α background with respect to nuclear recoil events that could be due to a WIMP (Weakly Interactive Massive Particle) signal [1,3,36,37] . In fact different ionizing particles produce very different scintillation signals in LAr.…”

Section: Discussionmentioning

confidence: 99%

Evidence of delayed light emission of tetraphenyl-butadiene excited by liquid-argon scintillation light

Segreto

2015

Phys. Rev. C

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Tetraphenyl-butadiene is the wavelength shifter most widely used in combination with liquid argon. The latter emits scintillation photons with a wavelength of 127 nm that need to be downshifted to be detected by photomultipliers with glass or quartz windows. Tetraphenyl-butadiene has been demonstrated to have an extremely high conversion efficiency, possibly higher than 100% for 127 nm photons, while there is no precise information about the time dependence of its emission. It is usually assumed to be exponentially decaying with a characteristic time of the order of one ns, as an extrapolation from measurements with exciting radiation in the near UV. This work shows that tetraphenyl-butadiene, when excited by 127 nm photons, re-emits photons not only with a very short decay time, but also with slower ones due to triplet states de-excitations. This fact can strongly contribute to clarifying the anomalies in liquid-argon scintillation light reported in the literature since the 1970s, namely, the inconsistency in the measured values of the long decay time constant and the appearance of an intermediate component. Similar effects should be also expected when the TPB is used in combination with helium and neon, which emit scintillation photons with wavelengths shorter than 127 nm.

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Section: Discussionmentioning

confidence: 99%

Evidence of delayed light emission of tetraphenyl-butadiene excited by liquid-argon scintillation light

Segreto

2015

Phys. Rev. C

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“…Ref. [55]), though at present typical fiducial masses for Argon prototypes are of the order of 100 kg [52]. The data we have generated does not represent the 'highstatistics' regime: across all three experiments the total number of events observed is roughly 200-300 with as few as 10 events in the Germanium detector for some scenarios.…”

Section: A Experimental Benchmarksmentioning

confidence: 99%

Parametrizing the local dark matter speed distribution: A detailed analysis

Kavanagh

2014

Phys. Rev. D

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In a recent paper, a new parametrization for the dark matter (DM) speed distribution f (v) was proposed for use in the analysis of data from direct detection experiments. This parametrization involves expressing the logarithm of the speed distribution as a polynomial in the speed v. We present here a more detailed analysis of the properties of this parametrization. We show that the method leads to statistically unbiased mass reconstructions and exact coverage of credible intervals. The method performs well over a wide range of DM masses, even when finite energy resolution and backgrounds are taken into account. We also show how to select the appropriate number of basis functions for the parametrization. Finally, we look at how the speed distribution itself can be reconstructed, and how the method can be used to determine if the data are consistent with some test distribution. In summary, we show that this parametrization performs consistently well over a wide range of input parameters and over large numbers of statistical ensembles and can therefore reliably be used to reconstruct both the DM mass and speed distribution from direct detection data.

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“…The slow control processes (measurement of the vacuum, temperatures, pressures; control of the liquid argon recirculation, cooling and level; steering the high voltages) are monitored and managed by a a Programmable Logic Controller (PLC). For a more detailed report on the status of ArDM one can refer to [11].…”

Section: The Detectormentioning

confidence: 99%

“…The source holder biasses the light propagation: the isotropic approximation is not valid, and the scintillation preferably shines towards the bottom PMT array. We refer the reader to[11] for more details.…”

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confidence: 99%

ArDM: first results from underground commissioning

et al. 2013

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The Argon Dark Matter experiment is a ton-scale double phase argon Time Projection Chamber designed for direct Dark Matter searches. It combines the detection of scintillation light together with the ionisation charge in order to discriminate the background (electron recoils) from the WIMP signals (nuclear recoils). After a successful operation on surface at CERN, the detector was recently installed in the underground Laboratorio Subterráneo de Canfranc, and the commissioning phase is ongoing. We describe the status of the installation and present first results from data collected underground with the detector filled with gas argon at room temperature.

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Status of the ArDM Experiment: First results from gaseous argon operation in deep underground environment

Cited by 7 publications

References 7 publications

Evidence of delayed light emission of tetraphenyl-butadiene excited by liquid-argon scintillation light

Evidence of delayed light emission of tetraphenyl-butadiene excited by liquid-argon scintillation light

Parametrizing the local dark matter speed distribution: A detailed analysis

ArDM: first results from underground commissioning

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