Title :
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
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;
Conference_Titel :
EFTF-2010 24th European Frequency and Time Forum
Conference_Location :
Noordwijk
Print_ISBN :
978-1-4673-5970-2
DOI :
10.1109/EFTF.2010.6533679
