A sparkless resistive glass correction electrode for the spherical proportional counter

Katsioulas, I.; Giomataris, I.; Knights, P.; Gros, M.; Navick, X.F.; Nikolopoulos, K.; Savvidis, I.

doi:10.1088/1748-0221/13/11/p11006

Cited by 36 publications

(40 citation statements)

References 22 publications

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“…A binned maximum likelihood fit of the model to the energy spectrum is performed using the following loglikelihood function: (6) where N i refers to the number of events observed in the i th bin of width ∆ i , while N tot refers to the total number of events which is fixed by the acquisition time and laser frequency (i.e. independent of the energy range over which the data is fit).…”

Section: A Modeling Of the Detector Responsementioning

confidence: 99%

“…(5) and Eq. (6). The contribution to the fit of signal events (N ≥ 1 e − ) and null events (N = 0 e − ) are indicated as dashed purple and solid orange lines, respectively.…”

Section: Trigger Efficiencymentioning

confidence: 99%

“…(5) and Eq. (6). For each value of µ, we fit a Gaussian to the distribution of the 10 3 best fit values of our parameters of interest.…”

Section: Appendixmentioning

confidence: 99%

See 2 more Smart Citations

Precision laser-based measurements of the single electron response of spherical proportional counters for the NEWS-G light dark matter search experiment

Arnaud¹,

Bard²,

Brossard³

et al. 2019

Phys. Rev. D

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Spherical Proportional Counters (SPCs) are a novel gaseous detector technology employed by the NEWS-G low-mass dark matter search experiment for their high sensitivity to single electrons from ionization. In this paper, we report on the first characterization of the single electron response of SPCs with unprecedented precision, using a UV-laser calibration system. The experimental approach and analysis methodology are presented along with various direct applications for the upcoming next phase of the experiment at SNOLAB. These include the continuous monitoring of the detector response and electron drift properties during dark matter search runs, as well as the experimental measurement of the trigger threshold efficiency. We measure a mean ionization energy of W = 27.6 ± 0.2 eV in Ne + CH4 (2%) for 2.8 keV X-rays, and demonstrate the feasibility of performing similar precision measurements at sub-keV energies for future gas mixtures to be used for dark matter searches at SNOLAB.

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Section: A Modeling Of the Detector Responsementioning

confidence: 99%

“…(5) and Eq. (6). The contribution to the fit of signal events (N ≥ 1 e − ) and null events (N = 0 e − ) are indicated as dashed purple and solid orange lines, respectively.…”

Section: Trigger Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Precision laser-based measurements of the single electron response of spherical proportional counters for the NEWS-G light dark matter search experiment

Arnaud¹,

Bard²,

Brossard³

et al. 2019

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

show abstract

“…tor from the anode wire and improves the electric field homogeneity for zenith angles near the wire [15]. However, further improvements in the field homogeneity are required, and in this led to the development of the resistive glass electrode prototypes [23]. In Fig.…”

Section: Pos(corfu2018)088mentioning

confidence: 99%

“…The details of the detector design are given in Ref. [23]. The module is at the centre of a spherical, stainless steel vessel of 15 cm radius and is supported by a copper rod with a 4 mm (6 mm) inner (outer) diameter.…”

Section: Pos(corfu2018)088mentioning

confidence: 99%