Onboard Hydrogen Frequency Standard for the Millimetron Space Observatory

Demidov, N. A.; Belyaev, А. А.; Polyakov, V. А.; Timofeev, Yu. V.

doi:10.1007/s11018-018-1503-5

Cited by 5 publications

(2 citation statements)

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“…Millimetron will have an onboard hydrogen atomic clock with an Alan deviation of about σ(τ ) = 1.9 • 10 −15 on τ ∼ 100 s., which makes it possible to conduct observations in VLBI mode even at frequencies that are much higher (up to 840 GHz) than those to be planned on board [20].…”

Section: Millimetron Observatorymentioning

confidence: 99%

Analysis of Orbital Configurations for Millimetron Space Observatory

Rudnitskiy,

Mzhelskiy,

Shchurov

et al. 2021

Preprint

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In this contribution a primary feasibility study of different orbital configurations for Millimetron space observatory is presented. Priority factors and limitations were considered by which it is possible to assess the capabilities of a particular orbit. It included technical and scientific capabilities of each orbit regarding the fuel costs, satellite observability, the quality of very long baseline interferometric (VLBI) imaging observations and source visibilities.

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Section: Millimetron Observatorymentioning

confidence: 99%

Analysis of Orbital Configurations for Millimetron Space Observatory

Rudnitskiy,

Mzhelskiy,

Shchurov

et al. 2021

Preprint

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“…At present, the countries that carry out the research and development of space active hydrogen masers mainly include Europe [5][6][7][8], Russia [9][10][11], and China [12][13][14]. The Neuchatel Observatory in Switzerland used a high-Q sapphire microwave resonator to replace the traditional resonator in space active hydrogen maser, which greatly reduced the mass of the entire system to about 35 kg (Figure 1A), and the frequency stability could reach 1.5 × 10 -13 /s and 1.5 × 10 -15 /10 5 s [6,7].…”

Section: Introductionmentioning

confidence: 99%

Design of a vacuum system for space active hydrogen maser

Que

et al. 2022

Front. Phys.

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With the high precision and stability of its frequency signal outputs, active hydrogen maser plays an important role in such fields as timing, satellite navigation, and communication. However, it needs to be lighter so as to be applied in space. We made a research, based on the calculation of the hydrogen flow and the adsorption efficiency of the adsorption unit, on the parameters of the vacuum system and the structural requirements, and designed a combined vacuum pump for the Space Active Hydrogen Maser (SAHM). This vacuum pump consists of a getter pump and a small ion pump, the total mass of which is about 5 kg. The pumping speed will be about 474 L/s by computation, when an amount, 2.5 MPa L, of hydrogen has been adsorbed by getters. Theoretically, the total source hydrogen inflow in lifetime is not higher than 20% of the total capacity getter pump, thus the design should amply meet the requirements of the SAHM vacuum system, and is of great significance for future SAHM applications.

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