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Wyświetlanie 1-10 z 20
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:
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:
The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements
Autorzy:
Emmenegger, S.
Kirch, K.
Doorenbos, C. B.
Harris, P. G.
Saenz-Arevalo, W.
Roccia, S.
Ries, D.
Pais, D.
Thorne, J.
Lefort, T.
Griffith, W. C.
Tavakoli Dinani, R.
Zsigmond, G.
Crawford, C. B.
Ban, G.
Piegsa, F. M.
Bison, G.
Bondar, V.
Fertl, M.
Krempel, J.
Rienäcker, I.
Schnabel, A.
Zejma, Jacek
Lauss, B.
Schmidt-Wellenburg, P.
Fratangelo, A.
Pignol, G.
Chanel, E.
Ayres, N. J.
Shen, B.
Svirina, K.
Rozpędzik, Dagmara
Bodek, Kazimierz
Clement, B.
Rebreyend, D.
Staab, M.
Bouillaud, T.
Daum, M.
Chiu, P.-J.
Yazdandoost, N.
Rauscher, G.
Naviliat-Cuncic, O.
Severijns, N.
Grujic, Z. D.
Opis:
We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute, which features an interior cubic volume with each side of length 2.92 m, thus providing an accessible space of 25 m$^{3}$. The MSR has 87 openings of diameter up to 220 mm for operating the experimental apparatus inside and an intermediate space between the layers for housing sensitive signal processing electronics. The characterization measurements show a remanent magnetic field in the central 1 m$^{3}$ below 100 pT and a field below 600 pT in the entire inner volume, up to 4 cm to the walls. The quasi-static shielding factor at 0.01 Hz measured with a sinusoidal 2$\mu$T peak-to-peak signal is about 100 000 in all three spatial directions and increases rapidly with frequency to reach 10$^{8}$ above 1 Hz.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
Autorzy:
Bouillaud, T.
Emmenegger, S.
Thorne, J. A.
Krempel, J.
Touati, S.
Severijns, N.
Ries, D.
Chanel, E.
Bison, G.
Daum, M.
Yazdandoost, N.
Griffith, W. C.
Roccia, S.
Hild, N.
Koss, P. A.
Bondar, V.
Naviliat-Cuncic, O.
Rozpędzik, Dagmara
Weis, A.
Lauss, B.
Fertl, M.
Ziehl, N.
Ayres, N. J.
Kasprzak, M.
Pignol, G.
Rienäcker, I.
Zsigmond, G.
Tavakoli Dinani, R.
Lefort, T.
Wursten, E.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Doorenbos, C. B.
Crawford, C. B.
Chiu, P.-J.
Mohanmurthy, P.
Svirina, K.
Clement, B.
Harris, P. G.
Flaux, P.
Shen, B.
Kirch, K.
Kletzl, V.
Rawlik, M.
Pais, D.
Zejma, Jacek
Piegsa, F. M.
Opis:
We report on a search for a new, short-range, spin-dependent interaction using a modified version of the experimental apparatus used to measure the permanent neutron electric dipole moment at the Paul Scherrer Institute. This interaction, which could be mediated by axion-like particles, concerned the unpolarized nucleons (protons and neutrons) near the material surfaces of the apparatus and polarized ultracold neutrons stored in vacuum. The dominant systematic uncertainty resulting from magnetic-field gradients was controlled to an unprecedented level of approximately 4 pT cm$^{−1}$ using an array of optically-pumped cesium vapor magnetometers and magnetic-field maps independently recorded using a dedicated measurement device. No signature of a theoretically predicted new interaction was found, and we set a new limit on the product of the scalar and the pseudoscalar couplings $g_{s}g_{p}\lambda^{2}$ < 8.3 $\times$ 10$^{-28}$ m$^{2}$ (95% C.L.) in a range of 5 µm < $\lambda$ < 25 mm for the monopole–dipole interaction. This new result confirms and improves our previous limit by a factor of 2.7 and provides the current tightest limit obtained with free neutrons.
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
Wyświetlanie 1-10 z 20

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