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Wyświetlanie 1-10 z 18
Tytuł:
Active compensation of magnetic field distortions based on vector spherical harmonics field description
Autorzy:
Chowdhuri, Z.
Wursten, E.
Daum, M.
Severijns, N.
Kirch, K.
Franke, B.
Rozpędzik, Dagmara
Perkowski, Maciej
Zejma, Jacek
Bison, G.
Fertl, M.
Zsigmond, G.
Quéméner, G.
Komposch, S.
Reis, D.
Schnabel, A.
Bodek, Kazimierz
Lauss, B.
Afach, S.
Wyszyński, Grzegorz
Koss, P. A.
Kozela, A.
Opis:
An analytic solution to the magnetostatic inverse problem in the framework of vector spherical harmonic basis functions is presented. This formalism is used for the design of a spherical magnetic field compensation system and its performance is compared with an already existing rectangular coil system. The proposed set of spherical coils with 15 degrees of freedom achieves a shielding factor of 1000 or better in a large part of the volume enclosed by the coils for a dipolar type external perturbation.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
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:
A device for simultaneous spin analysis of ultracold neutrons
Autorzy:
Chowdhuri, Z.
Lefort, T.
Wursten, E.
Daum, M.
Rawlik, M.
Kirch, K.
Rebreyend, D.
Franke, B.
Severijns, N.
Halaine, V.
Rozpędzik, Dagmara
Rocchia, S.
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Kermaidic, Y.
Bison, G.
Fertl, M.
Henneck, R.
Quemener, G.
Zsigmond, G.
Ries, D.
Komposch, S.
Mtchedlishvili, A.
Lemiere, Y.
Pignol, G.
Geltenbort, P.
Kazprzak, M.
Prashant, P. N.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Grujic, Z. D.
Afach, S.
Wyszyński, Grzegorz
Kozela, A.
Piegsa, F.
Weis, A.
Krempel, J.
Hayen, L.
Opis:
We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is (18.2 $\pm$ 6.1)% relative to the former sequential analyser under nominal running conditions.
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
Wyświetlanie 1-10 z 18

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