The trigger and timing system of the Double Chooz experiment

Beißel, F.; Cabrera, A.; Cucoanes, A. S.; Dawson, J.; Kryn, D.; Kuhnt, Christopher; Lucht, S.; Reinhold, B.; Rosenthal, M.; Roth, Stefan; Stahl, A.; Stüken, A.; Wiebusch, C. H.

doi:10.1088/1748-0221/8/01/t01003

Cited by 12 publications

(16 citation statements)

References 19 publications

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“…The detector is surrounded by 15 cm of demagnetized steel to suppress external γ-rays. The main detector is covered by an outer veto system (not used in this analysis).The readout is triggered by custom energy sum electronics [33][34][35]. The ID PMTs are separated into two groups of 195 PMTs uniformly distributed throughout the volume and the PMT signals in each group are summed.…”

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confidence: 99%

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Indication of Reactorν¯eDisappearance in the Double Chooz Experiment

Abe¹,

Aberle²,

Akiri³

et al. 2012

Phys. Rev. Lett.

1,109

732

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The Double Chooz Experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944 ± 0.016 (stat) ± 0.040 (syst) was obtained in 101 days of running at the Chooz Nuclear Power Plant in France, with two 4.25 GW th reactors. The results were obtained from a single 10 m 3 fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a non-zero value of the still unmeasured neutrino mixing parameter sin 2 2θ13. Analyzing both the rate of the prompt positrons and their energy spectrum we find sin 2 2θ13= 0.086 ± 0.041 (stat) ±0.030 (syst), or, at 90% CL, 0.017 < sin 2 2θ13 < 0.16. We report first results of a search for a non-zero neutrino oscillation [1] mixing angle, θ 13 , based on reactor antineutrino disappearance. This is the last of the three neutrino oscillation mixing angles [2,3] for which only upper limits [4,5] are available. The size of θ 13 sets the required sensitivity of long-baseline oscillation experiments attempting to measure CP violation in the neutrino sector or the mass hierarchy.In reactor experiments [6,7] addressing the disappearance ofν e , θ 13 determines the survival probability of electron antineutrinos at the "atmospheric" squaredmass difference, ∆m 2 atm . This probability is given by:where L is the distance from reactor to detector in meters and E the energy of the antineutrino in MeV. The full formula can be found in Ref.[1]. Eq. 1 provides a direct way to measure θ 13 since the only additional input is the well measured value of |∆m 2 atm | = (2.32Other running reactor experiments [9,10] are using the same technique.Electron antineutrinos of < 9 MeV are produced by reactors and detected through inverse beta decay (IBD): ν e + p → e + + n. Detectors based on hydrocarbon liquid scintillators provide the free proton targets. The IBD signature is a coincidence of a prompt positron signal followed by a delayed neutron capture. We present here our first results with a detector located ∼ 1050 m from the two 4.25 GW th thermal power reactors of the Chooz Nuclear Power Plant and under a 300 MWE rock overburden. The analysis is based on 101 days of data including 16 days with one reactor off and one day with both reactors off.The antineutrino flux of each reactor depends on its thermal power and, for the four main fissioning isotopes, 235 U, 239 Pu, 238 U, 241 Pu, their fraction of the total fuel content, their energy released per fission, and their fission and capture cross-sections. The fission rates and associated errors were evaluated using two predictive and complementary reactor simulation codes: MURE [17,18] and DRAGON [19]. This allowed a study of the sensitivity to the important reactor parameters (e.g.. thermal power, boron concentration, temperatures and densities). The quality of these simulations...

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mentioning

confidence: 99%

“…The readout is triggered by custom energy sum electronics [33][34][35]. The ID PMTs are separated into two groups of 195 PMTs uniformly distributed throughout the volume and the PMT signals in each group are summed.…”

mentioning

confidence: 99%

Indication of Reactorν¯eDisappearance in the Double Chooz Experiment

Abe¹,

Aberle²,

Akiri³

et al. 2012

Phys. Rev. Lett.

1,109

732

View full text Add to dashboard Cite

show abstract

“…A summed signal that is created in the FEE is used for the trigger [68]. The amplitude is roughly proportional to the charge collected at the PMT anodes.…”

Section: Outer Muon Vetomentioning

confidence: 99%

“…PPO and bis-MSB were added as fluor and wavelength-shifter, respectively. Three remotely operated calibration units mounted on top of each steel vessel allow for the deployment of an LED, a 68 Ge source, and a combined neutron/gamma source of 241 Am-13 C and 60 Co among three vertical axes. In each antineutrino detector, 192 20-cm PMTs along the side wall of the steel vessel detect the photons from interactions in the scintillators.…”

Section: Layout Of the Antineutrino Detectorsmentioning

confidence: 99%