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UNBF Physics Seminar

Author: Penny Davenport

Posted on Sep 23, 2019

Category: News and Notices

Bin Jian, NRC, will present "The NRC-FCs2 atomic fountain clock: primary frequency standard of Canada" on Thursday, Sept. 26, from 1:15 - 2:15 p.m., in the IUC Physics/Admin Bldg, 204.

“The definition of SI second is based on the transition frequency of the hyperfine ground states of 133Cs and is realized by primary frequency standards. The next generation of NRC’s primary frequency standards, NRC-FCs2 atomic fountain clock, has been developed over the last few years. The physics package of NRC-FCs2 was built at the National Physical Laboratory (UK) based on the design of the NPL-CsF2 atomic fountain clock in a collaboration between NPL and NRC. The other experimental subsystems, such as the optical, microwave, electronics and control systems, were adapted and/or upgraded from the previous NRC atomic fountain apparatus. We recently completed the first accuracy evaluation of NRC-FCs2 fountain clock with an overall systematic uncertainty of 2.4×10-16 in terms of the fractional frequency, which is comparable to the best in the world. The short term stability of NRC-FCs2 is 1.1×10-13 at 1 second averaging time. Frequency comparisons between NRC-FCs2 fountain clock and the other primary and secondary frequency standards contributing to the steering of TAI using GPS precise point positioning method show excellent agreement. NRC-FCs2 fountain clock will be used as a primary frequency standard to contribute to the steering of TAI and to calibrate the official time scale of Canada, UTC(NRC), and other atomic frequency standards.”

Please join us for Colloquium tea in P203 beforehand.

Category: News and Notices

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