Sensitivity enhancement of the gravitational detector OGRAN

Kulagin, V. V.; Oreshkin, S. I.; Попов, С. М.; Rudenko, V. N.; Yudin, I. S.

doi:10.1134/s1063778816130056

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…24 However, in Ref. 25 an intermediate order of magnitude less costly option was proposed, associated with cooling the acoustic detector to a nitrogen temperature of ∼ 80 K. The vacuum chamber of the OGRAN detector can relatively easily be transformed into a nitrogen cryostat as a result of adding an internal nitrogen bath and enveloping the detector with a thermally insulating screen shell. The corresponding design was developed and created for the cryo-OGRAN pilot model.…”

Section: Discussion Of Results and Development Prospectsmentioning

confidence: 99%

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

Rudenko¹,

Gavrilyuk²,

Gusev³

et al. 2020

Int. J. Mod. Phys. A

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Modernized version of the combined opto-acoustical gravitational wave detector OGRAN is presented. Located in the deep underground of the Baksan Neutrino Observatory this setup is aimed to work on the program of collapsing stars searching for in multi-channel manner with the neutrino telescope BUST. The both instruments have the sensitivity allowing a registration of collapses in our Galaxy as rare events with the estimated probability 0.03 year -1 . The OGRAN narrow band sensitivity at the kilohertz frequency is limited by its acoustical mode thermal noise achieving 10 −20 in term of metric perturbations. A possible algorithm of the joint data analysis for the both instruments is developed and resulting formulae of the right detection probability are given. A future increasing of the OGRAN sensitivity associated with the moderate cooling (nitrogen temperature) of the acoustical mode is also discussed.

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Section: Discussion Of Results and Development Prospectsmentioning

confidence: 99%

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

Rudenko¹,

Gavrilyuk²,

Gusev³

et al. 2020

Int. J. Mod. Phys. A

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Laser noise control in the optoacoustical gravitational antenna

Krysanov

2020

J. Phys.: Conf. Ser.

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It is shown that the metric sensitivity theory of the OGRAN project contains description of the Fabry-Perot cavity displacement readout scheme proposed by Braginsky. In theories a quality factor defines laser noise. As an alternative, two phenomenological intrinsic controlled parameters of laser noise are proposed to analyze readout resolution: spectral densities of frequency deviations and power random modulation P(t) = P 0[1 + £(t)]. The formula for vibration noise is derived. The new theory of instrumental sensitivity is applied to explain the effect of readout noise rise while increasing digitization time. To reduce the readout threshold signal from real value of 2 · 10−15 cm/Hz1/2 to required value of 3 · 10−16 cm/Hz1/2 there are proposed actions: 1) to limit temperature drift difference between laser and bar cavity frequencies by value of 250 Hz; 2) to suppress by circuitry means vibration disturbance voltage at the discriminator output while increasing by 20 dB width of feedback frequency range and feedback gain in this range.

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Noise factor and reception bandwidth in optoacoustical GW antenna

Krysanov

2021

J. Phys.: Conf. Ser.

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An expression has extracted from the OGRAN project theory, which provides connection between numerical values of noise factor F and achieved displacement resolution and antenna’s threshold signal in metric variations. Noise factor and “reception bandwidth” connects across displacement resolution. There is defined analytical expression and numerical value for design displacement resolution (sensitivity) on the base intention F = 1. It has appeared that the extracted analytical expression for readout resolution does not correspond to applied Pound-Drever-Hall technique and AURIGA circuitry. This requires an improvement in theoretical design. The achieved resolution value 2·10−15 cm/Hz1/2 is matched to the value for metric sensitivity in pulse hmin ≃ 10−18, which is 15 dB higher than the thermal sensitivity limit.

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Sensitivity enhancement of the gravitational detector OGRAN

Cited by 5 publications

References 16 publications

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

Laser noise control in the optoacoustical gravitational antenna

Noise factor and reception bandwidth in optoacoustical GW antenna

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