NIST F1 and F2

reportActive / Technical Report | Accession Number: ADA639437 | Open PDF

Abstract:

The National Institute of Standards and Technology operates a cesium fountain primary frequency standard, NIST-F1, which has been contributing to International Atomic Time TAI since 1999. During the intervening 11 years, we have improved NIST-F1 so that the uncertainty is currently delta integralintegralsub 0 approximately 3x10exp -16, dominated by uncertainty in the blackbody-radiation-induced frequency shift. In order to circumvent the uncertainty associated with the blackbody shift, we have built a new fountain, NIST-F2, in which the microwave interrogation region is cryogenic 80 K, reducing the blackbody shift to negligible levels. We briefly describe here the series of improvements to NIST-F1 that have allowed its uncertainty to reach the low 10-16 level and present early results from NIST-F2.

Author(s):
Heavner, T. P. ; Parker, T. E. ; Shirley, J. H. ; Kunz, P. ; Jefferts, S. R.
Author Organization(s):
NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO TIME AND FREQUENCY DIV
Descriptive Note:
Conference paper
Supplementary Note:
Presented at the Precise Time and Time Interval (PTTI) Systems and Applications Meeting (42nd) in Reston, Virginia on 15-18 Nov 2010 and published in proceedings of the same, p457-461. See also ADA547222, conference proceedings.
Pagination:
0009

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NIST-TFD/CO
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_6.2.3_Core Enterprise Services; JCA_5_Command and Control; JCA_8_Building Partnerships
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*FREQUENCY STANDARDS, BLACKBODY RADIATION, FREQUENCY SHIFT
Field(s)/Group(s):
Operations Research, Test Facilities, Equipment and Methods, Telemetry
Keyword(s):
NIST F1 CESIUM FOUNTAIN PRIMARY FREQUENCY STANDARD
Report Date:
2010 Nov 01
Creation Date:
2016 Oct 31