RICHARD SALDANHA IDENTIFICATION OF ... - KICP Workshops

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Signal Amplitude [a.u.] 10 5 10 4 10 3 10 2 10 1 Light Yield Measurements Single photoelectron spectrum 0 50 100 150 200 250 Energy L.Y. Resolution (σ) 122 8.87 [%] 5.2 Figure 2: Example of the charge response spectrum of a single PMT exposed to low-occupancy laser flashes. The horizontal axis measures charge in integrated digitizer counts (counts · samples), where 1 count · sample [keV] corresponds to a PMT [p.e. output/ charge keV] of 0.0078 pC. The colored curves represent components in the fit function used in the calibration. Green: pedestal. Dashed Magenta: Gaussian and exponential terms of the single-p.e. model convolved with pedestal. Solid Magenta: full single-p.e. response convolved with pedestal. Solid Blue: 2-p.e response. Dotted Blue: ≥ 3-p.e. response. Solid Red: Sum of all components. 511 8.78 3.4 662 9.08 3.1 have modeled the n-photoelectron response of the system as 1275 8.60 2.9 fn(x) = ρ(x) ∗ ψ n∗ 1 (x) (2) AVERAGE 8.9 +/- 0.4 where ρ denotes the zero photoelectron response (pedestal), ∗ is a convolution, and ψ n∗ is the n-fold The single photoelectron response of each tube was measured using Detector light yield was measured 6 a fast, pulsed laser using a series of external γ sources at null field Rate [counts/sec/10 p.e.] 0.20 0.15 0.10 0.05 0 arXiv:1204.6218 [astro-ph.IM] 137 Cs Spectrum χ 2 /ndf Mean Sigma 662 keV Line 169.7/115 6010 ± 1.8 186.2 ± 1.9 0 2000 4000 6000 8000 10000 12000 Detected scintillation light [p.e.]
S1 and S2 signals With drift fields on, the recoil energy is divided into a light (S1) and charge (S2) signal Erec ∝ S1 + k·S2 S1 and S2 are anti-correlated The sum is independent of the drift field S1 7
Page 1 and 2: PRINCETON UNIVERSITY 26th July 2012
Page 3 and 4: DarkSide Program Multi-stage progra
Page 5: DarkSide 10 First designed, built a
Page 9 and 10: • • • • • DS-10 Performan
Page 11 and 12: • • • External Water tank 80
Page 13 and 14: • • • 13 Borated Liquid Scint
Page 15 and 16: Inner detector TPC 19x 3” PMTs TP
Page 17 and 18: Underground Argon • 40 Ar is most
Page 19 and 20: Underground Argon Measurement Low b
Page 21 and 22: Sensitivity 21

RICHARD SALDANHA IDENTIFICATION OF ... - KICP Workshops

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