Development of passive hydrogen maser in Shanghai Astronomical Observatory

Author

Xie Yonghui ; Dai Jiayua ; Chen Wenxing ; Liu Tiexin ; Zhang Yong ; Pen Jixing ; Lin Chuanfu

Author_Institution

Shanghai Astron. Obs., Shanghai, China

fYear

2010

fDate

13-16 April 2010

Firstpage

1

Lastpage

5

Abstract

Study of passive hydrogen maser in Shanghai Astronomical Observatory is introduced. New type of passive hydrogen maser with high performance has been developed. It has unique features such as novel kind of electrode cavity with high Q factor (loaded-cavity Q factor up to 10000) and new frequency control scheme of electronics package, with the help of novel cavity-bulb assembly, quadrupole state selector, nickel purifier, new dissociator and four layer magnetic shield, the atomic signal gain of physics package is up to 3dB at -80dBm microwave signal input. Several passive hydrogen maser prototypes have been developed. Preliminary performance test yields the frequency stability better than 1×10-12τ-1/2(1s≤τ≤10000s) and 1×10-14 @1day.

Keywords

Q-factor measurement; astronomical observatories; atomic clocks; electrodes; hydrogen; Q factor; Shanghai astronomical observatory; atomic signal gain; cavity-bulb assembly; dissociator; electrode cavity; electronics package; frequency control scheme; frequency stability; layer magnetic shield; microwave signal input; nickel purifier; passive hydrogen maser development; physics package; quadrupole state selector;

fLanguage

English

Publisher

ieee

Conference_Titel

EFTF-2010 24th European Frequency and Time Forum

Conference_Location

Noordwijk

Print_ISBN

978-1-4673-5970-2

Type

conf

DOI

10.1109/EFTF.2010.6533679

Filename

6533679