Article

Jones, D J M; Aikomo, M; Ashford, S; Ashkhasi, A; Davis, J A; Devine, B; Eglin, B; Everett, S B; Foot, R; Galbraith, D; Hendricks, R J; Khatry, K; Langham, C; Lewis, R; Newton-Griffiths, J; Owen, H; Shemar, S L; Sheppard, A; Smyth, C; Szymaniec, K; Walby, S; Weston, D F M; Whale, J; Whibberley, P B; Wilson, A; Wilson, C; Margolis, H S (2024) A new resilient time and frequency infrastructure for UTC(NPL). Journal of Physics: Conference Series, 2889. 012025

Sherril, N; Parsons, A O; Baynham, C F A; Bowden, W; Curtis, E A; Hendricks, R; Hill, I R; Hobson, R; Margolis, H S; Robertson, B I; Schioppo, M; Szymaniec, K; Tofful, A; Tunesi, J; Godun, R M; Calmet, X (2023) Analysis of atomic-clock data to constrain variations of fundamental constants. New Journal of Physics, 25. 093012

Barontini, G; Blackburn, L; Boyer, V; Butuc-Mayer, F; Calmet, X; Lopez-Urrutia, J R C; Curtis, E A; Darquie, B; Dunningham, J; Fitch, N J; Forgan, E M; Georgiou, K; Gill, P; Godun, R M; Goldwin, J; Guarrera, V; Harwood, A C; Hill, I R; Hendricks, R J; Jeong, M; Johnson, M Y H; Keller, M; Kozhiparambil Sajith, L P; Kuipers, F; Margolis, H S; Mayo, C; Newman, P; Parsons, A O; Prokhorov, L; Robertson, B I; Rodewald, J; Safronova, M S; Sauer, B E; Schioppo, M; Sherril, N; Stadnik, Y V; Szymaniec, K; Tarbutt, M R; Thompson, R C; Tofful, A; Tunesi, J; Vecchio, A; Wang, Y; Worm, S (2022) Measuring the stability of fundamental constants with a network of clocks. EPJ Quantum Technology, 9. 12

Burrows, K; Hendricks, R J; Szymaniec, K; Gibble, K; Beattie, S; Jian, B (2020) Measuring atom positions in a microwave cavity to evaluate distributed cavity phase shifts. Metrologia, 57 (6). 065003 ISSN 0026-1394

Beattie, S; Jian, B; Alcock, J; Gertsvolf, M; Hendricks, R; Szymaniec, K; Gibble, K (2020) First accuracy evaluation of the NRC-FCs2 primary frequency standard. Metrologia, 57 (3). 035010 ISSN 0026-1394

Hendricks, R J; Ozimek, F; Szymaniec, K; Nagorny, B; Dunst, P; Nawrocki, J; Beattie, S; Jian, B; Gibble, K (2019) Cs Fountain Clocks for Commercial Realizations—An Improved and Robust Design. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 66 (3). pp. 624-631. ISSN 0885-3010

Szymaniec, K; Hendricks, R J; Turza, K; Nagórny, B; Dunst, P; Nawrocki, J; Krehlik, P; Śliwczyński, Ł; Czubla, A (2018) Operation of caesium fountain frequency standards with remote hydrogen maser references. Metrologia, 55 (6). pp. 782-788. ISSN 0026-1394

Barwood, G P; Gill, P; Klein, H A; Hosaka, K; Huang, G; Lea, S N; Margolis, H S; Szymaniec, K; Walton, B R (2017) Trapped strontium ion optical clocks. Proceedings of the SPIE, 10567. 105672U

Szymaniec, K; Lea, S N; Gibble, K*; Park, S E*; Liu, K*; Glowacki, P* (2016) NPL Cs fountain frequency standards and the quest for the ultimate accuracy. J. Phys.: Conf. Ser., 723. 012003

Ovchinnikov, Y B; Szymaniec, K; Edris, S* (2015) Measurement of rubidium ground-state hyperfine transition frequency using atomic fountains. Metrologia, 52 (4). pp. 595-599.

Barwood, G P; Huang, G; Klein, H A; Johnson, L A M; King, S A; Margolis, H S; Szymaniec, K; Gill, P (2014) Agreement between two 88Sr+ optical clocks to 4 parts in 10^17. Phys. Rev. A, 89 (5). 050501

Godun, R M; Nisbet-Jones, P B R; Jones, J M; King, S A; Johnson, L A M; Margolis, H S; Szymaniec, K; Lea, S N; Bongs, K*; Gill, P (2014) Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time-variation of fundamental constants. Phys. Rev. Lett., 113 (21). 210801

Szymaniec, K; Lea, S N; Liu, K* (2014) An evaluation of the frequency shift caused by collisions with background gas in the primary frequency standard NPL-CsF2. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 61 (1). pp. 203-206.

Szymaniec, K; Noh, H R*; Park, S E*; Takamizawa, A* (2013) Spin polarization in a freely evolving sample of cold atoms. Appl. Phys. B, Laser Opt., 111 (3). pp. 527-535.

King, S A; Godun, R M; Webster, S A; Margolis, H S; Johnson, L A M; Szymaniec, K; Baird, P E G*; Gill, P (2012) Absolute frequency measurement of the 2S- 1/2 - 2F-2 7/2) electric octupole transition in a single ion of Yb-171(+) with 10(-15) fractional uncertainty. New J. Phys., 14 (1). 013045

Li, R X*; Gibble, K*; Szymaniec, K (2011) Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts. Metrologia, 48 (5). pp. 283-289.

Szymaniec, K; Park, S E* (2011) Primary frequency standard NPL-CsF2: optimised operation near the collisional shift cancellation point. IEEE Trans. Instrum. Meas., 60 (7). pp. 2475-2481.

Szymaniec, K; Park, S E*; Marra, G; Chalupczak, W (2010) First accuracy evaluation of the NPL-CsF2 primary frequency standard. Metrologia, 47 (4). pp. 363-376.

Bauch, A*; Achkar, J*; Bize, S*; Calonico, D*; Dach, R*; Hlavac, R*; Lorini, L*; Parker, T*; Petit, G*; Piester, D; Szymaniec, K; Uhrich, P* (2006) Comparison between frequency standards in Europe and the USA at the 10-15 uncertainty level. Metrologia, 43 (1). pp. 109-120.

Szymaniec, K; Chalupczak, W; Whibberley, P B; Lea, S N; Henderson, D (2006) Reply to the comment on 'Evaluation of the primary frequency standard NPL-CsF1'. Metrologia, 43 (3). L18-19

Szymaniec, K; Chalupczak, W; Whibberley, P B; Lea, S N; Henderson, D (2005) Evaluation of the primary frequency standard NPL-CsF1. Metrologia, 42 (1). pp. 49-57.

Margolis, H S; Barwood, G P; Huang, G; Klein, H A; Lea, S N; Szymaniec, K; Gill, P (2004) Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion. Science, 306 (5700). pp. 1355-1358.

Conference or Workshop Item

Beattie, S; Jian, B; Alcock, J; Gertsvolf, M; Hendricks, R J; Szymaniec, K; Gibble, K (2019) NRC-FCs2 primary frequency standard at the National Research Council Canada. In: 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 9-15 March 2019, New Delhi, India.

Hendricks, R J; Burrows, K; Szymaniec, K (2019) Robust Cs fountain clocks, novel evaluation tools and flexible operational configurations. In: URSI Asia-Pacific Radio Science Conference (AP-RASC), 9-15 March 2019, New Delhi, India.

Beattie, S; Jian, B; JohnAlcock, A; Gertsvolf, M; Hendricks, R; Szymaniec, K; Gibble, K (2018) Preliminary Evaluation of NRC-FCs2 Fountain Clock at the National Research Council Canada. In: 2018 IEEE International Frequency Control Symposium (IFCS), 21-24 May 2018, Olympic Valley, CA, USA.

Hendricks, R J; Ozimek, F; Szymaniec, K; Dunst, P; Nagorny, B; Nawrocki, J; Beattie, S; Jian, B; Chen, W; Gibble, K (2017) Design and performance of Cs fountain frequency standards constructed for metrology laboratories. In: 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFC), 9-13 July 2017, Besancon, France.

Beattie, S; Jian, B; Alcock, A J; Bernard, J; Gertsvolf, M; Hendricks, R; Ozimek, F; Szymaniec, K; Gibble, K (2017) The NRC-FCs2 primary frequency standard at the national research council Canada. In: 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFC), 9-13 July 2017, Besancon, France.

Dunst, P; Nagorny, B; Lemanski, D; Nogas, P; Nawrocki, J; Hendricks, R J; Ozimek, F; Szymaniec, K (2017) Preliminary evaluation of the AOS-CsF1 primary frequency standard. In: 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFC), 9-13 July 2017, Besancon, France.

Gibble, K*; Lea, S N; Szymaniec, K (2012) A microwave cavity designed to minimize distributed cavity phase errors in a primary cesium frequency standard. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Barwood, G P; Huang, G; Klein, H A; Margolis, H S; Lea, S N; Szymaniec, K; Chalupczak, W; Gill, P (2006) An optical frequency standard based on a transition in a single trapped strontium ion. In: Optical Frequency Combs for Space International Workshop, 2-3 October 2006, NPL, UK.

Szymaniec, K; Chalupczak, W; Whibberley, P B; Lea, S N; Henderson, D (2004) Evaluation of NPL-CSF1 primary frequency standard. In: Conference on Precision Electromagnetic Measurement (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Szymaniec, K; Chalupczak, W; Henderson, D (2003) Initial evaluation of the NPL caesium fountain frequency standard. In: Proceedings of the 2003 IEEE International Frequency Control Symposium and PDS Exhibition (jointly with the 17th European Frequency and Time Forum), 3-9 May 2003, Tempa, Florida, USA.

Henderson, D; Lea, S N; Szymaniec, K; Whibberley, P B (2001) Towards a caesium fountain frequency standard at the NPL. In: Proceedings of the 15th European Frequency and Time Forum (EFTF), March 2001, Neuchatel, Switzerland.

Henderson, D; Lea, S N; Szymaniec, K; Whibberley, P B (2001) Towards a ceasium fountain frequency standard at the NPL. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Henderson, D; Whibberley, P B; Szymaniec, K; Lea, S N (1999) Towards a caesium fountain frequency standard at NPL. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, November 1999, Brighton, UK.