High precision measurements of carbon disulfide negative ion mobility and diffusion

Snowden‐Ifft, D.; Gauvreau, J.-L.

doi:10.1063/1.4803004

Cited by 23 publications

(48 citation statements)

References 12 publications

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“…The key feature of the DRIFT detector is the fact that negative ions (CS − 2 ) are used to transport the ionization signal to the readout plane composed of Multi-Wire Proportional Counters (MWPC) [57]. It opens the possibility to develop TPCs with very long drift distances with minimal diffusion and hence large volumes [53][54][55][56][57]. The gas mixture currently used is 73% CS 2 + 25% CF 4 + 2% O 2 at a pressure of 55 mbar.…”

Section: Driftmentioning

confidence: 99%

“…The choice of the target medium is thus critical. CS 2 offers the possibility to drift negative ions, which enables very long drift distances with minimal diffusion and hence large volumes [51][52][53][54][55][56][57]. Directional electron-drift TPCs are using CF 4 , for the spin content of 19 F that enables a sensitivity to spin dependent interaction [58], and for the properties of this gas: electron drift velocity, diffusion and its scintillation output, which can be used for optical readout [22,59].…”

Section: B Track Reconstructionmentioning

confidence: 99%

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A review of the discovery reach of directional Dark Matter detection

et al. 2016

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Section: Driftmentioning

confidence: 99%

Section: B Track Reconstructionmentioning

confidence: 99%

A review of the discovery reach of directional Dark Matter detection

et al. 2016

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“…The goal of the DRIFT collaboration is the detection of a directional signal from WIMP dark matter in our galaxy [89]. In order to accomplish this goal a unique, low-pressure, Negative Ion Time Projection Chamber (NITPC) technology has been developed [90]. The negative-ion drift allows DRIFT to have the lowest energy threshold and best inherent directionality of any limit-setting, directional, dark matter detector [91,92].…”

Section: C1 Capabilitiesmentioning

confidence: 99%

Dark Matter Search in a Beam-Dump eXperiment (BDX) at Jefferson Lab

Battaglieri¹,

Bersani²,

Caiffi³

et al. 2016

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MeV-GeV dark matter (DM) is theoretically well motivated but remarkably unexplored. This proposal presents the MeV-GeV DM discovery potential for a ∼1 m 3 segmented CsI(Tl) scintillator detector placed downstream of the Hall A beam-dump at Jefferson Lab, receiving up to 10 22 electrons-on-target (EOT) in 285 days. This experiment (Beam-Dump eXperiment or BDX) would be sensitive to elastic DM-electron and to inelastic DM scattering at the level of 10 counts per year, reaching the limit of the neutrino irreducible background. The distinct signature of a DM interaction will be an electromagnetic shower of few hundreds of MeV, together with a reduced activity in the surrounding active veto counters. A detailed description of the DM particle χ production in the dump and subsequent interaction in the detector has been performed by means of Monte Carlo simulations. Different approaches have been used to evaluate the expected backgrounds: the cosmogenic background has been extrapolated from the results obtained with a prototype detector running at INFN-LNS (Italy), while the beam-related background has been evaluated by GEANT4 Monte Carlo simulations. The proposed experiment will be sensitive to large regions of DM parameter space, exceeding the discovery potential of existing and planned experiments in the MeV-GeV DM mass range by up to two orders of magnitude. 4We propose a beam-dump experiment to search for light (MeV-GeV) Dark Matter (DM). DM in this mass range is motivated by both experimental and theoretical considerations. On the theory side, simple extensions to the Standard Model (SM) can accommodate DM-SM interactions that yield the observed DM cosmological abundance. On the experimental side, such models also generically feature particles that explain the currently discrepant value of the muon's anomalous magnetic moment and resolve anomalies in astrophysical observations, while simultaneously evading cosmological and direct-production constraints.This experiment could be performed by placing a detector downstream of one of the JLab experimental Halls to detect DM particles that could be produced by the electron beam in the dump, pass through surrounding shielding material, and deposit visible energy inside the detector by scattering off various target particles or -if unstable -by decaying inside the detector volume. A new underground facility placed ∼ 20m downstream of the beam dump of the experimental Hall-A will host the detector, serving as a general-purpose facility for any future beam-dump experiments. The run would be completely parasitic without affecting the normal operations and the physics program of the Hall. The most striking signal that this experiment would look for consists of events with ∼ GeV electromagnetic energy deposition. With the detector and the experimental set-up we are proposing, this signal will be easily detected over a negligible background. This striking signature can arise in two classes of models: in those where DM scatters elastically off atomic electrons in the detector, an...

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“…After an interaction in the active volume of the detector, the electronegative CS 2 component is used to capture free electrons in the gas. Drifting ionization track signals as anions minimizes the effect of diffusion to thermal scale [48]. The high drift field around the MWPC anode wires strips the excess electron from the CS − 2 , leading to proportional avalanche multiplication [49].…”

Section: The Drift-iid Detector and Directed Neutron Exposuresmentioning

confidence: 99%

Measurement of directional range components of nuclear recoil tracks in a fiducialised dark matter detector

Battat¹,

Daw²,

Ezeribe³

et al. 2017

J. Inst.

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A: We present results from the first measurement of axial range components of fiducialized neutron induced nuclear recoil tracks using the DRIFT directional dark matter detector. Nuclear recoil events are fiducialized in the DRIFT experiment using temporal charge carrier separations between different species of anions in 30:10:1 Torr of CS 2 :CF 4 :O 2 gas mixture. For this measurement, neutron-induced nuclear recoil tracks were generated by exposing the detector to 252 Cf source from different directions. Using these events, the sensitivity of the detector to the expected axial directional signatures were investigated as the neutron source was moved from one detector axis to another. Results obtained from these measurements show clear sensitivity of the DRIFT detector to the axial directional signatures in this fiducialization gas mode.

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High precision measurements of carbon disulfide negative ion mobility and diffusion

Cited by 23 publications

References 12 publications

A review of the discovery reach of directional Dark Matter detection

A review of the discovery reach of directional Dark Matter detection

Dark Matter Search in a Beam-Dump eXperiment (BDX) at Jefferson Lab

Measurement of directional range components of nuclear recoil tracks in a fiducialised dark matter detector

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