Status report on the EXPLORER and NAUTILUS detectors and the present science run

Astone, P.; Ballantini, R.; Babusci, D.; Bassan, M.; Carelli, P.; Cavallari, G.; Cavanna, F.; Chincarini, A.; Coccia, E.; Cosmelli, C.; D’Antonio, S.; Dubath, F.; Fafone, V.; Foffa, Stefano; Gemme, G.; Giordano, G.; Maggiore, Michele; Marini, A.; Minenkov, Y.; Modena, I.; Modestino, G.; Moleti, Arturo; Murtas, F.; Pai, A.; Palamara, O.; Pallottino, G. V.; Parodi, R.; Mortari, G. Piano; Pizzella, G.; Quintieri, L.; Rocchi, A.; Ronga, F.; Sturani, R.; Terenzi, R.; Torrioli, G.; Vaccarone, R.; Vandoni, G.; Visco, M.

doi:10.1088/0264-9381/23/8/s08

Cited by 23 publications

(19 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was calculated for an optimally oriented source, as will be described in detail below. The detector parameters used for this simulation have already been achieved in separate experiments [1,2,3]. The sensitivity curves are obtained considering the detector operating at T = 50mK with a 50 SQUID amplifier and with the electrical mode coupled to the mechanical ones.…”

Section: B Strain Sensitivitymentioning

confidence: 99%

See 1 more Smart Citation

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Gottardi

2007

Phys. Rev. D

View full text Add to dashboard Cite

We report the results of a detailed numerical analysis of a real resonant spherical gravitational wave antenna operating with six resonant two-mode capacitive transducers read out by superconducting quantum interference devices (SQUID) amplifiers. We derive a set of equations to describe the electro-mechanical dynamics of the detector. The model takes into account the effect of all the noise sources present in each transducer chain: the thermal noise associated with the mechanical resonators, the thermal noise from the superconducting impedance matching transformer, the back-action noise and the additive current noise of the SQUID amplifier. Asymmetries in the detector signal-to-noise ratio and bandwidth, coming from considering the transducers not as point-like objects but as sensor with physically defined geometry and dimension, are also investigated. We calculate the sensitivity for an ultracryogenic, 30 ton, 2 meter in diameter, spherical detector with optimal and non-optimal impedance matching of the electrical read-out scheme to the mechanical modes. The results of the analysis is useful not only to optimize existing smaller mass spherical detector like MiniGrail, in Leiden, but also as a technological guideline for future massive detectors. Furthermore we calculate the antenna patterns when the sphere operates with one, three and six transducers. The sky coverage for two detectors based in The Netherlands and Brasil and operating in coincidence is also estimated. Finally, we describe and numerically verify a calibration and filtering procedure useful for diagnostic and detection purposes in analogy with existing resonant bar detectors.

show abstract

Section: B Strain Sensitivitymentioning

confidence: 99%

“…Resonant bar antennas are in continuous operation at 4.2K with sensitivity and bandwidth never reached before [1], [2]. These detectors could improve their sensitivity of one order of magnitude in the coming years when operating at 100mK.…”

Section: Introductionmentioning

confidence: 99%

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Gottardi

2007

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…We consider the EXPLORER and NAUTILUS operating during 2004 [21], using the filtered data setup as the ROG collaboration released [28]. The main characteristics of the experimental apparatuses, in terms of frequency coverage, are shown in Table I.…”

Section: Explorer and Nautilus Sensitivitymentioning

confidence: 99%

“…The test validity is performed employing the real signals generated by extensive air showers (EASs) [23], and the filtered data of EXPLORER and NAUTILUS, all relative to the year 2004 [21,28]. Two events were selected, each for the single detector, with highest interaction energy with relative bar, in order to be independent of the noise.…”

Section: Cosmic Rays Detectionmentioning

confidence: 99%

“…The resonant GW detectors EXPLORER and NAUTILUS [21] data are analyzed corresponding to the long sequence that occurred on October 5th [22], and to the GF on December 27th. As previously seen, during this event, several observations were performed using GW experimental apparatuses but, as far as the October outburst is concerned, there were no previous GW measurements although it represents a very significant event because of the exceptional energy release and duration, extending 3 Â 10 42 erg over more than 100 pulses in a 10-minute span of time.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SGR 1806-20 and the gravitational wave detectors EXPLORER and NAUTILUS

Modestino

Pizzella

2011

Phys. Rev. D

View full text Add to dashboard Cite

The activity of the soft gamma ray repeater SGR 1806-20 is studied in correlation with the EXPLORER and NAUTILUS data, during the year 2004, for gravitational wave (GW) short signal search. Corresponding to the most significant triggers, the bright outburst on October 5th and the giant flare (GF) on December 27th, the associated GW signature is searched. Two methods are employed for processing the data. With the average-modulus algorithm, the presence of short pulses with energy E gw ! 1:8 Â 10 49 erg is excluded with 90% probability, under the hypothesis of isotropic emission. This value is comparable to the upper limits obtained by LIGO regarding similar sources. Using the cross-correlation method, we find a discrepancy from the null-hypothesis of the order of 1%. This statistical excess is not sufficient to claim a systematic association between the gravitational and the electromagnetic radiations, because the estimated GW upper limits are yet several orders of magnitude far away from the theoretically predicted levels, at least three for the most powerful SGR flare.

show abstract

The Detection of Gravitational Waves

Braccini

Fidecaro

2015

Gravity: Where Do We Stand?

View full text Add to dashboard Cite

Status report on the EXPLORER and NAUTILUS detectors and the present science run

Cited by 23 publications

References 12 publications

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

SGR 1806-20 and the gravitational wave detectors EXPLORER and NAUTILUS

The Detection of Gravitational Waves

Contact Info

Product

Resources

About