A Helium Cryostat for Investigating the Properties of Massive Solid Resonators with Deep Cooling

Krysanov, V. A.; Motylev, A. M.; Oreshkin, S. I.; Rudenko, V. N.

doi:10.1007/s11018-015-0643-0

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Modernized version of this setup was implemented for the development of the OGRAN cryogenic setup. Also, a special helium cryostat was used for testing mirror's parameters evolution during the cooling process [12]. Optical scheme of the modernized test model is presented in Fig.…”

Section: Ogran Test Setup With Cryogenic Mirrorsmentioning

confidence: 99%

“…The cylindrical body had a 2 cm hole along main axis to transmit laser light in FP cavity. The aluminum body with attached mirrors was placed in the special cryostat [12] also in the good thermal contact with walls of cryostat inner chamber. To minimize losses of thermal irradiation, the inner chamber was covered by several screens with liquid helium and nitrogen temperatures.…”

Section: Technology Of Cryogenic Opticsmentioning

confidence: 99%

“…The only one optical window with 2 cm in diameter was foreseen at the end cover of the cryostat together with co-centric holes in the inner envelopes. Through this window the light of pump laser can illuminate the FP resonator associated with the model detector (details of the cryostat and the model one can take in [12]). Reflected from FP resonator light might be picked up with outside photo detector.…”

Section: Technology Of Cryogenic Opticsmentioning

confidence: 99%

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Opto-acoustical gravitational bar detector with cryogenic mirrors

et al. 2016

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Abstract. Enhancing of sensitivity of the opto-acoustical gravitational wave (GW) antenna OGRAN installed in the underground facilities of Baksan Neutrino Observatory is analyzed. Calculations are presented showing a sensitivity improving on two orders of value after a cooling the solid body acoustical part of the antenna to the nitrogen temperature. A possibility of keeping of the same optical scheme of the antenna at low temperature is discussed. Design of modernized construction for cryogenic version of the antenna OGRAN is described. Test experiments with cooled pilot model carrying cryogenic mirrors illuminated by the optical pump up to 0.5 W are presented.

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Section: Ogran Test Setup With Cryogenic Mirrorsmentioning

confidence: 99%

Section: Technology Of Cryogenic Opticsmentioning

confidence: 99%

Section: Technology Of Cryogenic Opticsmentioning

confidence: 99%

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Opto-acoustical gravitational bar detector with cryogenic mirrors

et al. 2016

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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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