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Prospective Active Hydrogen Maser VCH-2021

А. А. Belyaev, V. G. Vorontsov, S. D. Gorelov, N. А. Demidov, D. G. Knyazev, V. А. Polyakov, Yu. V. Timofeev

Transactions of IAA RAS, issue 67, 44–50 (2023)

Keywords: active hydrogen maser, single state selection system, adiabatic rapid passage method

Abstract

The results of the development of a prospective active hydrogen maser VCH-2021 based on physics package with single state selection are discussed. The main terms causing the active hydrogen maser frequency stability are analyzed: cavity thermal noise and receiver thermal noise. Since the medium- and long-term frequency stability is mainly caused by the cavity thermal noise a single state selection method is proposed to reduce its contribution. The main design features of the single state selection system and the results of calculations of the number of atoms entering the storage bulb are considered. Inversion area design are reviewed. At the moment, two methods of creating an inversion region are known: the sudden field reversal method and the adiabatic rapid passage method. The main advantage of the adiabatic rapid passage method for serial production is no need to use careful shielding of the inversion region. The magnitude of the constant component of the magnetic field in this method is approximately G, while for the correct operation of the sudden field reversal method the magnitude of the residual external magnetic fields should not exceed 1 × 10^(–6) G. The description of the main electronic parts of the VCH-2021 is given. The digital phase lock loop system of the crystal oscillator frequency and the digital cavity autotuning system are used in the instrument. All of this allowed to reduce the hydrogen maser output signals phase temperature coefficient less than 2 ps/°С; simplify adjusting procedure; improve accuracy, reproducibility, stability, portability. The single state selection control module has been developed provides direct current supply and Zeeman transition frequencies generation necessary for the adiabatic rapid passage method.

Citation

Text

RIS

А. А. Belyaev, V. G. Vorontsov, S. D. Gorelov, N. А. Demidov, D. G. Knyazev, V. А. Polyakov, Yu. V. Timofeev. Prospective Active Hydrogen Maser VCH-2021 // Transactions of IAA RAS. — 2023. — Issue 67. — P. 44–50.

TY  - JOUR
TI  - Prospective Active Hydrogen Maser VCH-2021
AU  - Belyaev, А. А.
AU  - Vorontsov, V. G.
AU  - Gorelov, S. D.
AU  - Demidov, N. А.
AU  - Knyazev, D. G.
AU  - Polyakov, V. А.
AU  - Timofeev, Yu. V.
PY  - 2023
T2  - Transactions of IAA RAS
IS  - 67
SP  - 44
AB  - The results of the development of a prospective active hydrogen maser
VCH-2021 based on physics package with single state selection are
discussed. The main terms causing the active hydrogen maser frequency
stability are analyzed: cavity thermal noise and receiver thermal
noise. Since the medium- and long-term frequency stability is mainly
caused by the cavity thermal noise a single state selection method is
proposed to reduce its contribution.  The main design features of the
single state selection system and the results of calculations of the
number of atoms entering the storage bulb are considered. Inversion
area design are reviewed. At the moment, two methods of creating an
inversion region are known: the sudden field reversal method and the
adiabatic rapid passage method. The main advantage of the adiabatic
rapid passage method for serial production is no need to use careful
shielding of the inversion region. The magnitude of the constant
component of the magnetic field in this method is approximately G,
while for the correct operation of the sudden field reversal method
the magnitude of the residual external magnetic fields should not
exceed 1 × 10^(–6) G.  The description of the main electronic parts
of the VCH-2021 is given. The digital phase lock loop system of the
crystal oscillator frequency and the digital cavity autotuning system
are used in the instrument. All of this allowed to reduce the
hydrogen maser output signals phase temperature coefficient less than
2 ps/°С; simplify adjusting procedure; improve accuracy,
reproducibility, stability, portability. The single state selection
control module has been developed provides direct current supply and
Zeeman transition frequencies generation necessary for the adiabatic
rapid passage method.
DO  - 10.32876/ApplAstron.67.44-50
UR  - http://iaaras.ru/en/library/paper/2170/
ER  -