, Volume 32, Issue 1, pp 67–76 | Cite as

Systematic Uncertainty Evaluation of the Cesium Fountain Primary Frequency Standard at NPL India

  • Aishik Acharya
  • Vattikonda Bharath
  • Poonam Arora
  • Suchi Yadav
  • Ashish Agarwal
  • Amitava Sen Gupta
Short Communication


CSIR-NPL, India (NPLI) has developed its first Cesium atomic fountain (NPLI-CsF1). The indigenously developed fountain frequency standard is now fully operational and its frequency is now being evaluated along with all systematic and statistical uncertainties. Seven frequency evaluations have been recently conducted to estimate fountain frequency with respect to UTC (Coordinate Universal Time). The fountain frequency is compared with the Hydrogen MASER frequency which is contributing to UTC and hence fountain frequency is evaluated with respect to the UTC The fountain frequency is stable to few parts in 1015 at <1 day averaging time.


Laser cooling Cold atom Time scale Atomic fountain clock 



The authors are gratefully acknowledged funding from Council of Scientific and Industrial Research, India for supporting the work.


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Copyright information

© Metrology Society of India 2016

Authors and Affiliations

  1. 1.Time and Frequency SectionCSIR—National Physical LaboratoryNew DelhiIndia
  2. 2.Academy of Scientific and Innovative ResearchChennaiIndia
  3. 3.The NORTHCAP UniversityGurgaonIndia

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