The R
icochet
reactor neutrino observatory is planned to be installed at the Laue Langevin Institute starting mid-2022. Its scientific goal is to perform a low-energy and high precision measurement ...of the coherent elastic neutrino-nucleus scattering spectrum in order to explore exotic physics scenarios. R
icochet
will host two cryogenic detector arrays: the CryoCube (Ge target) and the Q-
array
(Zn target), operated at 10 mK. The 1 kg Ge CryoCube will consist of 27 Ge crystals instrumented with NTD-Ge thermal sensors and charge collection electrodes for a simultaneous heat and ionization readout to reject the electromagnetic backgrounds (gamma, beta, x-rays). We present the status of its front-end electronics. The first stage of amplification is made of High Electron Mobility Transistors developed by CNRS/C2N laboratory, optimized to achieve ultra-low noise performance at 1 K with a dissipation as low as 15
μ
W per channel. Our noise model predicts that 10 eV heat and 20 eV
ee
RMS baseline resolutions are feasible with a high dynamic range for the deposited energy (up to 10 MeV) thanks to loop amplification schemes. Such resolutions are mandatory to have a high discrimination power between nuclear and electron recoils at the lowest energies.
Results from a prototype TES detector for the Ricochet experiment Augier, C.; Baulieu, G.; Belov, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2023, Volume:
1057
Journal Article
Peer reviewed
Open access
Coherent elastic neutrino-nucleus scattering (CEνNS) offers valuable sensitivity to physics beyond the Standard Model. The Ricochet experiment will use cryogenic solid-state detectors to perform a ...precision measurement of the CEνNS spectrum induced by the high neutrino flux from the Institut Laue-Langevin nuclear reactor. The experiment will employ an array of detectors, each with a mass of ∼30 g and a targeted energy threshold of 50 eV. Nine of these detectors (the “Q-Array”) will be based on a novel Transition-Edge Sensor (TES) readout style, in which the TES devices are thermally coupled to the absorber using a gold wire bond. We present initial characterization of a Q-Array-style detector using a 1 gram silicon absorber, obtaining a baseline root-mean-square resolution of less than 40 eV.
The future
Ricochet
experiment aims at searching for new physics in the electroweak sector by providing a high precision measurement of the Coherent Elastic Neutrino-Nucleus Scattering (CENNS) ...process down to the sub-100 eV nuclear recoil energy range. The experiment will deploy a kg-scale low-energy-threshold detector array combining Ge and Zn target crystals 8.8 m away from the 58 MW research nuclear reactor core of the Institut Laue Langevin (ILL) in Grenoble, France. Currently, the
Ricochet
Collaboration is characterizing the backgrounds at its future experimental site in order to optimize the experiment’s shielding design. The most threatening background component, which cannot be actively rejected by particle identification, consists of keV-scale neutron-induced nuclear recoils. These initial fast neutrons are generated by the reactor core and surrounding experiments (reactogenics), and by the cosmic rays producing primary neutrons and muon-induced neutrons in the surrounding materials. In this paper, we present the
Ricochet
neutron background characterization using
3
He proportional counters which exhibit a high sensitivity to thermal, epithermal and fast neutrons. We compare these measurements to the
Ricochet
Geant4 simulations to validate our reactogenic and cosmogenic neutron background estimations. Eventually, we present our estimated neutron background for the future
Ricochet
experiment and the resulting CENNS detection significance. Our results show that depending on the effectiveness of the muon veto, we expect a total nuclear recoil background rate between 44 ± 3 and 9 ± 2 events/day/kg in the CENNS region of interest, i.e. between 50 eV and 1 keV. We therefore found that the
Ricochet
experiment should reach a statistical significance of 4.6 to 13.6
σ
for the detection of CENNS after one reactor cycle, when only the limiting neutron background is considered.
The future
Ricochet
experiment aims to search for new physics in the electroweak sector by measuring the Coherent Elastic Neutrino-Nucleus Scattering process from reactor antineutrinos with high ...precision down to the sub-100 eV nuclear recoil energy range. While the
Ricochet
collaboration is currently building the experimental setup at the reactor site, it is also finalizing the cryogenic detector arrays that will be integrated into the cryostat at the Institut Laue Langevin in early 2024. In this paper, we report on recent progress from the Ge cryogenic detector technology, called the CryoCube. More specifically, we present the first demonstration of a 30 eVee (electron equivalent) baseline ionization resolution (RMS) achieved with an early design of the detector assembly and its dedicated High Electron Mobility Transistor (HEMT) based front-end electronics with a total input capacitance of about 40 pF. This represents an order of magnitude improvement over the best ionization resolutions obtained on similar phonon-and-ionization germanium cryogenic detectors from the EDELWEISS and SuperCDMS dark matter experiments, and a factor of three improvement compared to the first fully-cryogenic HEMT-based preamplifier coupled to a CDMS-II germanium detector with a total input capacitance of 250 pF. Additionally, we discuss the implications of these results in the context of the future
Ricochet
experiment and its expected background mitigation performance.
Ricochet Progress and Status Augier, C.; Beaulieu, G.; Belov, V. ...
Journal of low temperature physics,
08/2023, Volume:
212, Issue:
3-4
Journal Article
Peer reviewed
Open access
We present an overview of recent progress toward the
Ricochet
coherent elastic neutrino nucleus scattering (CE
ν
NS) experiment. The ILL research reactor in Grenoble, France has been selected as the ...experiment site, after in situ studies of vibration and particle backgrounds. We present background rate estimates specific to that site, along with descriptions of the planned CryoCube and Q-Array detector payloads.
The feasibility of wireless intra-chip interconnections is presented. Integrated antennas and transmitted electromagnetic waves properties are investigated via simulation and experimental results. ...Materials and metallization design impact on system performances is found critical. Their study leads to the definition of high-performance structures manufactured via standard dual damascene processes. As a result, excellent propagation characteristics are obtained with crosstalk effects between antenna and nearby lines of the same order with those of traditional interconnects, thus demonstrating the viability and economic interest of wireless interconnects.
The New IRAM KID Arrays 2 (NIKA2) consortium has just finished installing and commissioning a millimetre camera on the IRAM 30-m telescope. It is a dual-band camera operating with three ...frequency-multiplexed kilo-pixels arrays of lumped element kinetic inductance detectors (LEKID) cooled at 150 mK, designed to observe the intensity and polarisation of the sky at 260 and 150 GHz (1.15 and 2 mm). NIKA2 is today an IRAM resident instrument for millimetre astronomy, such as intracluster medium from intermediate to distant clusters and so for the follow-up of Planck satellite detected clusters, high redshift sources and quasars, early stages of star formation and nearby galaxies emission. We present an overview of the instrument performance as it has been evaluated at the end of the commissioning phase.
Journal of Low Temperature Physics 209, pages 570-580 (2022) The RICOCHET reactor neutrino observatory is planned to be installed at the
Laue Langevin Institute (ILL) starting mid-2022. Its ...scientific goal is to
perform a low-energy and high precision measurement of the coherent elastic
neutrino-nucleus scattering (CE$\nu$NS) spectrum in order to explore exotic
physics scenarios. RICOCHET will host two cryogenic detector arrays: the
CryoCube (Ge target) and the Q-ARRAY (Zn target), operated at 10 mK. The 1 kg
Ge CryoCube will consist of 27 Ge crystals instrumented with NTD-Ge thermal
sensors and charge collection electrodes for a simultaneous heat and ionization
readout to reject the electromagnetic backgrounds (gamma, beta, x-rays). We
present the status of its front-end electronics. The first stage of
amplification is made of High Electron Mobility Transistor (HEMT) developed by
CNRS/C2N laboratory, optimized to achieve ultra-low noise performance at 1K
with a dissipation as low as 15 $\mu$W per channel. Our noise model predicts
that 10 eV heat and 20 eVee RMS baseline resolutions are feasible with a high
dynamic range for the deposited energy (up to 10 MeV) thanks to loop
amplification schemes. Such resolutions are mandatory to have a high
discrimination power between nuclear and electron recoils at the lowest
energies.
The future Ricochet experiment aims to search for new physics in the electroweak sector by measuring the Coherent Elastic Neutrino-Nucleus Scattering process from reactor antineutrinos with high ...precision down to the sub-100 eV nuclear recoil energy range. While the Ricochet collaboration is currently building the experimental setup at the reactor site, it is also finalizing the cryogenic detector arrays that will be integrated into the cryostat at the Institut Laue Langevin in early 2024. In this paper, we report on recent progress from the Ge cryogenic detector technology, called the CryoCube. More specifically, we present the first demonstration of a 30~eVee (electron equivalent) baseline ionization resolution (RMS) achieved with an early design of the detector assembly and its dedicated High Electron Mobility Transistor (HEMT) based front-end electronics. This represents an order of magnitude improvement over the best ionization resolutions obtained on similar heat-and-ionization germanium cryogenic detectors from the EDELWEISS and SuperCDMS dark matter experiments, and a factor of three improvement compared to the first fully-cryogenic HEMT-based preamplifier coupled to a CDMS-II germanium detector. Additionally, we discuss the implications of these results in the context of the future Ricochet experiment and its expected background mitigation performance.
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