Characterization and Optimization of EDELWEISS-III FID800 Heat Signals

Billard, J.; Jésus, M. de; Juillard, A.; Queguiner, E.

doi:10.1007/s10909-016-1500-5

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…In this section we study the impact of pulse tube-induced vibrations on the noise of a bolometer. We focus on the 250 g germanium detector because of its increased sensitivity compared to the 30 g detector, thanks to its improved thermal sensing design [18]. We operated the detector at a fixed temperature of 18 mK which corresponds to the standard operating temperatures of the EDELWEISS experiment [6].…”

Section: Bolometer Noise Spectramentioning

confidence: 99%

Vibrations on pulse tube based Dry Dilution Refrigerators for low noise measurements

Olivieri

Billard

Jésus

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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International audienceDry Dilution Refrigerators (DDR) based on pulse tube cryo-coolers have started to replace Wet Dilution Refrigerators (WDR) due to the ease and low cost of operation. However these advantages come at the cost of increased vibrations, induced by the pulse tube. In this work, we present the vibration measurements performed on three different commercial DDRs. We describe in detail the vibration measurement system we assembled, based on commercial accelerometers, conditioner and DAQ, and examined the effects of the various damping solutions utilized on three different DDRs, both in the low and high frequency regions. Finally, we ran low temperature, pseudo-massive (30 and 250 g) germanium bolometers in the best vibration-performing system under study and report on the results

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Section: Bolometer Noise Spectramentioning

confidence: 99%

Vibrations on pulse tube based Dry Dilution Refrigerators for low noise measurements

Olivieri

Billard

Jésus

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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“…These values are a compromise between the sensitivity to microphonics at such high impedance and non-linearity of the V NT D (I) responses (NTD voltage versus bias current). These non-linearities appear due to thermal decoupling of the detectors from the bath via the heat sink, thermal decoupling of the NTD from the germanium crystal via the glue in between them and electron-phonon decoupling within the NTD [32].…”

Section: Heat Channel Readoutmentioning

confidence: 99%

“…With a typical heat response of 0.5 V/K, an energy sensitivity of 50 nV/keV is obtained. Typical time constants at 18 mK are 10 ms for the rise time and 10 and 100 ms for the two main decay times respectively (see [32] for details).…”

Section: Heat Channel Readoutmentioning

confidence: 99%

Performance of the EDELWEISS-III experiment for direct dark matter searches

et al. 2017

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A : We present the results of measurements demonstrating the efficiency of the EDELWEISS-III array of cryogenic germanium detectors for direct dark matter searches. The experimental setup and the FID (Fully Inter-Digitized) detector array is described, as well as the efficiency of the double measurement of heat and ionization signals in background rejection. For the whole set of 24 FID detectors used for coincidence studies, the baseline resolutions for the fiducial ionization energy are mainly below 0.7 keV ee (FHWM) whereas the baseline resolutions for heat energies are mainly below 1.5 keV ee (FWHM). The response to nuclear recoils as well as the very good discrimination capability of the FID design has been measured with an AmBe source. The surface βand α-decay rejection power of R surf < 4 × 10 −5 per α at 90% C.L. has been determined with a 210 Pb source, the rejection of bulk γ-ray events has been demonstrated using γ-calibrations with 133 Ba sources leading to a value of R γ−mis−fid < 2.5 × 10 −6 at 90% C.L.. The current levels of natural radioactivity measured in the detector array are shown as the rate of single γ background. The fiducial volume fraction of the FID detectors has been measured to a weighted average value of (74.6 ± 0.4)% using the cosmogenic activation of the 65 Zn and 68,71 Ge isotopes. The stability and uniformity of the detector response is also discussed. The achieved resolutions, thresholds and background levels of the upgraded EDELWEISS-III detectors in their setup are thus well suited to the direct search of WIMP dark matter over a large mass range.

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“…Also shown are the 1 V normalized heat signal bandwidth and the theoretical noise calculations based on a full electro-thermal modeling 7The minimum ionizing particle in Ge is 7.3 MeV/cm which leads to an energy peak close to 18 MeV. of the detectors [20,22]. Note that the noise expectations are different between the two detectors as using different readout electronics, AC modulation (Figure 7-a and -b) and DC biased current (Figure 7-c), which have different noise characteristics.…”

Section: Bolometer Noise Performancementioning

confidence: 99%

Vibration decoupling system for massive bolometers in dry cryostats

et al. 2018

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A: Pulse-tube based dilution refrigerators are massively employed in low temperature physics. They allow to reduce the running costs and to be operated with unprecedented easiness. However, the main drawback of this technology is the mechanical vibrations induced by the pulsetube cryocooler. These perturbations can cause extra-noises drastically affecting the detector performance. In this paper, we propose a solution to mitigate the impact of these vibrations by mounting the detectors in an elastic-pendulum based suspended tower. Based on vibration modeling and experimental tests, we show that the vibration levels are attenuated by up to two orders of magnitude at most frequencies, especially above ∼ 20 Hz, for both vertical and radial directions. Thanks to this passive isolation solution, vibration levels, both along vertical and radial directions, below 1 µg/ √ Hz in the frequency range [1-1000] Hz are obtained. This provides a convenient environment to test the ultimate performance of low temperature detectors. As a result, we report an improvement by one to two orders of magnitude on the noise levels of massive cryogenic bolometers, leading to thermal energy resolutions improved by a factor 5 to 40. Finally, we conclude that the energy resolution of our cryogenic bolometers are no longer limited from any residual vibrations, hence allowing the perspective of further improving our bolometer performance in the context of low-mass dark matter searches and neutrino physics applications.

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Characterization and Optimization of EDELWEISS-III FID800 Heat Signals

Abstract: National audienc

Cited by 10 publications

References 6 publications

Vibrations on pulse tube based Dry Dilution Refrigerators for low noise measurements

Vibrations on pulse tube based Dry Dilution Refrigerators for low noise measurements

Performance of the EDELWEISS-III experiment for direct dark matter searches

Vibration decoupling system for massive bolometers in dry cryostats

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