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Wyświetlanie 1-10 z 12
Tytuł:
Highly stable atomic vector magnetometer based on free spin precession
Autorzy:
Chowdhuri, Z.
Lefort, T.
Piegsa, F. M.
Wursten, E.
Rawlik, M.
Kirch, K.
Severijns, N.
Rozpędzik, Dagmara
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Bison, G.
Roccia, S.
Quemener, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Lemiere, Y.
Helaine, V.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Kasprzak, M.
Grujic, Z. D.
Koch, H. C.
Afach, S.
Wyszyński, Grzegorz
Kozela, A.
Prashanth, P. N.
Weis, A.
Krempel, J.
Hayen, L.
Knowles, P.
Opis:
We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 mu T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and achieves a scalar resolution better than 300 fT for integration times ranging from 80 ms to 1000 s. The best scalar resolution of less than 80 fT was reached with integration times of 1.6 to 6 s. We were able to measure the magnetic field direction with a resolution better than 10 mu rad for integration times from 10 s up to 2000 s.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Constraining interactions mediated by axion-like particles with ultracold neutrons
Autorzy:
Zenner, J.
Lefort, T.
Piegsa, F. M.
Daum, M.
Frakke, B.
Kirch, K.
Rebreyend, D.
Severijns, N.
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Kermaidic, Y.
Bison, G.
Fertl, M.
Roccia, S.
Quemener, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Lemiere, Y.
Pignol, G.
Schnabel, A.
Helaine, V.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Kasprzak, M.
Grujic, Z. D.
Koch, H. C.
Afach, S.
Wyszyński, Grzegorz
Voigt, J.
Kozela, A.
Burghoff, M.
Prashanth, P. N.
Weis, A.
Krempel, J.
Knowles, P.
Opis:
We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 1 mu T vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. A possible coupling between freely precessing polarized neutron spins and unpolarized nucleons of the wall material can be investigated by searching for a tiny change of the precession frequencies of neutron and mercury spins. Such a frequency change can be interpreted as a consequence of a short range spin-dependent interaction that could possibly be mediated by axions or axion-like particles. The interaction strength is proportional to the CP violating product of scalar and pseudoscalar coupling constants g(S)g(P). Our result confirms limits from complementary experiments with spin-polarized nuclei in a model-independent way. Limits from other neutron experiments are improved by up to two orders of magnitude in the interaction range of 10(-6) < lambda < 10(-4) m.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Measurement of a false electric dipole moment signal from ^{199}Hg atoms exposed to an inhomogeneous magnetic field
Autorzy:
Chowdhuri, Z.
Grujic, Z.
Lefort, T.
Zenner, J.
Horras, M.
Piegsa, F. M.
Wursten, E.
Daum, M.
Severijns, N.
Kirch, K.
Rebreyend, D.
Franke, B.
Green, K.
Naviliat-Cuncic, O.
Harris, P. G.
Kermaidic, Y.
Zejma, Jacek
Bison, G.
Fertl, M.
van der Grinten, M. G. D.
Henneck, R.
Pendlebury, J. M.
Quemener, G.
Roccia, S.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Heil, W.
Lemiere, Y.
Pignol, G.
Geltenbort, P.
Ivanov, S. N.
Iaydjiev, P.
Helaine, V.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Kasprzak, M.
Lauss, B.
Koch, H. C.
Afach, S.
Wyszyński, Grzegorz
Kozela, A.
Prashanth, P. N.
Ban, B.
Weis, A.
Krempel, J.
Knowles, P.
Opis:
We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for Hg-199 atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the motional magnetic field. The proportionality to electric-field strength makes it apparently similar to an electric dipole moment (EDM) signal, although unlike an EDM this effect is P- and T-conserving. We have used a neutron magnetic resonance EDM spectrometer, featuring a mercury co-magnetometer and an array of external cesium magnetometers, to measure the shift as a function of the applied magnetic field gradient. Our results are in good agreement with theoretical expectations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Gravitational depolarization of ultracold neutrons : comparison with data
Autorzy:
Prashanth, P. N.
Kirch, K.
Quemener, G.
Franke, B.
Komposch, S.
Roccia, S.
Ivanov, S. N.
Ries, D.
Kasprzak, M.
Griffith, W. C.
Lefort, T.
Shiers, D.
Wursten, E.
Rawlik, M.
Zsigmond, G.
Koch, H. C.
Plonka-Spehr, C.
Geltenbort, P.
Pendlebury, J. M.
Kermaidic, Y.
Ban, G.
Piegsa, F. M.
Bison, G.
Fertl, M.
Krempel, J.
Zejma, Jacek
Lauss, B.
Schmidt-Wellenburg, P.
van der Grinten, M. G. D.
Musgrave, M.
Kozela, A.
Pignol, G.
Ayres, N. J.
Helaine, V.
Zenner, J.
Iaydjiev, P.
Rozpędzik, Dagmara
Green, K.
Bodek, Kazimierz
Thorne, J. A.
Weis, A.
Rebreyend, D.
Baker, C. A.
Harris, P. G.
Heil, W.
Afach, S.
Lemiere, Y.
Naviliat-Cuncic, O.
Severijns, N.
Grujic, Z. D.
Opis:
We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field gradients of spin-depolarization rates and also of shifts in the measured neutron Larmor precession frequency. We find excellent qualitative agreement, with gravitationally enhanced depolarization accounting for several previously unexplained features in the data.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment
Autorzy:
Chowdhuri, Z.
Lefort, T.
Piegsa, F. M.
Wursten, E.
Koch, H.-C.
Daum, M.
Leredde, A.
Rawlik, M.
Kirch, K.
Rebreyend, D.
Franke, B.
Severijns, N.
Grujić, Z. D.
Rozpędzik, Dagmara
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Kermaidic, Y.
Emmenegger, S.
Pierre, E.
Chiu, P.-J.
Dinani, R. Tavakoli
Bondar, V.
Bison, G.
Fertl, M.
Roccia, S.
Hélaine, V.
Quéméner, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Pignol, G.
Mohanmurthy, P.
Ayres, N. J.
Hild, N.
Griffith, W. C.
Schnabel, A.
Pazgalev, A.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Kasprzak, M.
Lauss, B.
Abel, C.
Afach, S.
Wyszyński, Grzegorz
Musgrave, M.
Koss, P. A.
Kozela, A.
Prashanth, P. N.
Ferraris-Bouchez, L.
Thorne, J.
Lemière, Y.
Pais, D.
Crawford, C. B.
Chanel, E.
Weis, A.
Krempel, J.
Hayen, L.
Knowles, P.
Opis:
An array of 16 laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser drives all magnetometers that are located in a high-vacuum chamber, with a selection of the sensors mounted on a high-voltage electrode. We describe details of the Cs sensors' construction and modes of operation, emphasizing the accuracy and sensitivity of the magnetic-field readout. We present two applications of the magnetometer array directly beneficial to the nEDM experiment: (i) the implementation of a strategy to correct for the drift of the vertical magnetic-field gradient and (ii) a procedure to homogenize the magnetic field. The first reduces the uncertainty of the nEDM result. The second enables transverse neutron spin relaxation times exceeding 1500 s, improving the statistical sensitivity of the nEDM experiment by about 35% and effectively increasing the rate of nEDM data taking by a factor of 1.8.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 12

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