Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO<sub>2</sub>bolometers

Willers, M.; Feilitzsch, F. von; Gütlein, A.; Münster, A.; Lanfranchi, J.‐C.; Oberauer, L.; Potzel, W.; Roth, Stephan V.; Schönert, S.; Sivers, M. v.; Wawoczny, S.; Zöller, A.; Giuliani, A.

doi:10.1088/1748-0221/10/03/p03003

Cited by 22 publications

(25 citation statements)

References 23 publications

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“…Noise spectra of NTLLD4 detector signal acquired for different electrode voltage bias, without photon flux 34. Ulisse cryostat, CSNSM (d) Noise spectra of NTLLD4 detector signal, acquired for different electrode voltage bias and for different photon flux generated via the LED.…”

mentioning

confidence: 99%

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Novati

Bergé

Dumoulin

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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In this work we present how to fabricate large-area (15 cm 2 ), ultra-low threshold germanium bolometric photo-detectors and how to operate them to detect few (optical) photons. These detectors work at temperatures as low as few tens of mK and exploit the Neganov-Trofimov-Luke (NTL) effect. They are operated as charge-to-heat transducers: the heat signal is linearly increased by simply changing a voltage bias applied to special metal electrodes, fabricated onto the germanium absorber, and read by a (NTD-Ge) thermal sensor. We fabricated a batch of five prototypes and ran them in different facilities with dilution refrigerators. We carefully studied how impinging spurious infrared radiation impacts the detector performances, by shining infrared photons via optical-fiber-guided LED signals, in a controlled manner, into the bolometers. We hence demonstrated how the radiation-tightness of the test environment tremendously enhances the detector performances, allowing to set electrode voltage bias up to 90 volts without any leakage current and signal-to-noise gain as large as a factor 12 (for visible photons). As consequence, for the first time we could operate large-area NTD-Ge-sensorequipped NTL bolometric photo-detectors capable to reach sub 10-eV baseline noise (RMS). Such detectors open new frontiers for rare-event search experiments based on low light yield Ge-NTD equipped scintillating bolometers, such the CUPID neutrinoless double-beta decay experiment.1 The enhancement of visible-wavelength photons absorption was initially found to be 35% [45].

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mentioning

confidence: 99%

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Novati

Bergé

Dumoulin

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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“…Re-scaling the light signal from 2615 to 2528 keV, we obtain DP=3.6, using one highly likely assumption that an α particle at 2528 keV will show a light signal equal than the same particle at 5304 keV ( 210 Po). This DP is the best ever achieved with large mass TeO 2 crystals (M > 7 g) and without the need for additional Neganov-Luke amplification [33,45,46], or more sophisticated TES sensors [47] or both [48].…”

Section: Heat and Light Measurementmentioning

confidence: 86%

Cryogenic light detectors with enhanced performance for rare event physics

Barucci

Beeman

Caracciolo

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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We have developed and tested a new way of coupling bolometric light detectors to scintillating crystal bolometers based upon simply resting the light detector on the crystal surface, held in position only by gravity. This straightforward mounting results in three important improvements: (1) it decreases the amount of non-active materials needed to assemble the detector, (2) it substantially increases the light collection efficiency by minimizing the light losses induced by the mounting structure, and (3) it enhances the thermal signal induced in the light detector thanks to the extremely weak thermal link to the thermal bath.We tested this new technique with a 16 cm 2 Ge light detector with thermistor readout sitting on the surface of a large TeO 2 bolometer. The light collection efficiency was increased by greater than 50% compared to previously tested alternative mountings. We obtained a baseline energy resolution on the light detector of 20 eV RMS that, together with increased light collection, enabled us to obtain the best α vs β/γ discrimination ever obtained with massive TeO 2 crystals. At the same time we achieved rise and decay times of 0.8 and 1.6 ms, respectively. This superb performance meets all of the requirements for the CUPID (CUORE Upgrade with Particle IDentification) experiment, which is a 1-ton scintillating bolometer follow up to CUORE. tons, producing heat (phonons) that is measured by a suitable thermometer. The main difference among the various Bolometric Light Detector (BLD) instruments currently in use is the choice of the thermometer element, e.g. Transition Edge Sensors (TES) [12], Neutron Transmutation Doped (NTD) thermistors [13] or Micro Magnetic Calorimeters (MMC) [14].The work presented here was performed within the CU-PID framework [15,16], the future follow up of CUORE [17] that represents the largest world-wide bolometric experiment to date. The aim was to develop NTD-based BLDs with improved performance in terms of sensitivity, time response and simplified packaging for large arrays. Using the tiny Cherenkov light emission of TeO 2 [18,19] to decrease by two order of magnitude the α-induced background, requires a BLD with a S/N ratio of the order of ∼5 [16]: this corresponds to a RMS baseline resolution of the BLD of the order of ∼20 eV being the Cherenkov light signal of the order of 100 eV. Actually one can work towards the optimization of the light collection [20] and/or towards the energy resolution of the BLD or -as we made in this work-both. Additionally, in case of 100 Mo-based compounds, beside the same need to suppress the surface α-induced background, a fast time response of the BLD (≤ 1 ms) is mandatory to suppress the background induced the pile-up of the 2ν DBD [21]: also in this case the S/N ratio will play an important

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“…At the energy scale of interest for 0νββ, the signal electrons emit light while α particles do not. Several tests were done on small [82][83][84] and large crystals 80,[85][86][87][88][89] to characterize the discrimination power. The challenge of this method is the detection of the extremely small amount of light emitted by electrons at the 130 Te 0νββ energy (Q ββ ∼2.5 MeV) that is of the order of 100 eV, 87,90,91 i.e.…”

Section: Scintillating Bolometersmentioning

confidence: 99%

Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers

Bellini

2018

Int. J. Mod. Phys. A

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Bolometers are cryogenic calorimeters which feature excellent energy resolution, low energy threshold, high detection efficiency, flexibility in choice of materials, particle identification capability if operated as hybrid devices. After thirty years of rapid progresses, they represent nowadays a leading technology in several fields: particle and nuclear physics, X-ray astrophysics, cosmology. However, further and substantial developments are required to increase the sensitivity to the levels envisioned by future researches. A review of the challenges to be addressed and potentialities of bolometers in the search for rare nuclear decays is given, with particular emphasis to the neutrinoless double beta decay physics case.

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Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO₂bolometers

Cited by 22 publications

References 23 publications

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Cryogenic light detectors with enhanced performance for rare event physics

Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers

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Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO2bolometers

Cited by 22 publications

References 23 publications

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Cryogenic light detectors with enhanced performance for rare event physics

Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers

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Product

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Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO₂bolometers