Particle discrimination in TeO 2 bolometers using light detectors read out by transition edge sensors

Schäffner, K.; Angloher, G.; Bellini, F.; Casali, N.; Ferroni, F.; Hauff, D.; Nagorny, S.; Pattavina, L.; Petricca, F.; Pirro, S.; Pröbst, F.; Reindl, F.; Seidel, W.; Strauß, R.

doi:10.1016/j.astropartphys.2015.03.008

Cited by 34 publications

(22 citation statements)

References 34 publications

(32 reference statements)

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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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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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“…Although TeO 2 crystals are not scintillating the phonon-light technique could be applied via the detection of Cherenkov radiation [15]. The first experimental realization of this background suppression technique was achieved using silicon based NTL-amplified cryogenic light detectors [47] and has since been also achieved using silicon-on-sapphire based light detectors [48] and germanium-based NTL detectors [25]. The technique is currently also being considered for the future CUPID experiment [49,50].…”

Section: Neutrinoless Double Beta Decaymentioning

confidence: 99%

Cryogenic detectors for dark matter search and neutrinoless double beta decay

Münster

Schönert

Willers

2017

Nuclear Instruments and Methods in Physics Research Section A:

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“…These are low radioactive contamination, large sensitive area (∼5x5 cm 2 ), ease of fabrication and operation on the scale of ∼1000 detectors and limited thermal and mechanical impact on the cryogenic apparatus hosting the experiment. While there are several promising experimental techniques [13,14,15], none of them meet all the above mentioned requirements at present.…”

Section: The Calder Projectmentioning

confidence: 99%

CALDER: Cryogenic light detectors for background-free searches

Domizio

Bellini

Cardani

et al. 2018

AIP Conference Proceedings

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High sensitivity phonon-mediated kinetic inductance detector with combined amplitude and phase read-out Applied Physics Letters 110, 033504 (2017) Abstract. CALDER is a R&D project for the development of cryogenic light detectors with an active surface of 5x5cm 2 and an energy resolution of 20 eV RMS for visible and UV photons. These devices can enhance the sensitivity of next generation large mass bolometric detectors for rare event searches, providing an active background rejection method based on particle discrimination. A CALDER detector is composed by a large area Si absorber substrate with superconducting kinetic inductance detectors (KIDs) deposited on it. The substrate converts the incoming light into athermal phonons, that are then sensed by the KIDs. KID technology combine fabrication simplicity with natural attitude to frequency-domain multiplexing, making it an ideal candidate for a large scale bolometric experiments. We will give an overview of the CALDER project and show the performances obtained with prototype detectors both in terms of energy resolution and efficiency.

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Particle discrimination in TeO 2 bolometers using light detectors read out by transition edge sensors

Cited by 34 publications

References 34 publications

Cryogenic light detectors with enhanced performance for rare event physics

Cryogenic light detectors with enhanced performance for rare event physics

Cryogenic detectors for dark matter search and neutrinoless double beta decay

CALDER: Cryogenic light detectors for background-free searches

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