Autor: Koss, P. A. - Prolib Integro

Skocz do pozycji: 1.

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

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Tytuł:: Search for ultralight axion dark matter in a side-band analysis of a $^{199}$Hg free-spin precession signal
Autorzy:: Lefort, T.
Piegsa, F. M.
Wursten, E.
Daum, M.
Dechenaux, B.
Rawlik, M.
Kirch, K.
Severijns, N.
Rozpędzik, Dagmara
Pignol, Guillaume
Schmidt-Wellenburg, Philipp
Flaux, P.
Ban, G.
Harris, P. G.
Kermaidic, Y.
Emmenegger, S.
Zejma, Jacek
Bondar, V.
Bison, G.
Roccia, Stephanie
Ries, D.
Komposch, S.
Thorne, J. A.
Ayres, N. J.
Griffith, W. C.
MohanMurthy, Prajwal
Naviliat Cuncic, Oscar
Bodek, Kazimierz
Lauss, B.
Abel, C.
Koss, P. A.
Stadnik, Y. V.
Zsigmond, Geza
Pais, D.
Crawford, C. B.
Chanel, E.
Weis, A.
Krempel, J.
Opis:: Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field. Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's trajectory through our Galaxy. This spin coupling resembles an oscillating pseudo-magnetic field which modulates the spin precession of nuclear spins. Here we report on the null result of a demonstration experiment searching for a frequency modulation of the free spin-precession signal of $^{199}$Hg in a 1 $\mu$T magnetic field. Our search covers the axion mass range 10$^{-16}$ eV $\lesssim$ m$_{a} \lesssim$ 10$^{-13}$ eV and achieves a peak sensitivity to the axion-nucleon coupling of g$_{aNN} \approx$ 3.5 $\times$ 10$^{-6}$ GeV$^{-1}$.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: The n2EDM experiment at the Paul Scherrer Institute
Autorzy:: Emmenegger, S.
Kirch, K.
Crawford, C.
Roccia, S.
Ries, D.
Pais, D.
Thorne, J.
Lefort, T.
Griffith, W. C.
Ross, K.
Wursten, E.
Rawlik, M.
Leredde, A.
Zsigmond, G.
Ban, G.
Piegsa, F. M.
Bison, G.
Bondar, V.
Krempel, J.
Schnabel, A.
Zejma, Jacek
Lauss, B.
Schmidt-Wellenburg, P.
Flaux, P.
Mohanmurthy, P.
Kozela, A.
Pignol, G.
Chanel, E.
Ayres, N. J.
Ferraris-Bouchez, L.
Rozpędzik, Dagmara
Virot, R.
Bodek, Kazimierz
Clement, B.
Weis, A.
Rebreyend, D.
Grujić, Z. D.
Koss, P. A.
Daum, M.
Lemière, Y.
Chiu, P.-J.
Harris, P. G.
Heil, W.
Voigt, J.
Abel, C.
Naviliat-Cuncic, O.
Severijns, N.
Hild, N.
Opis:: We present the new spectrometer for the neutron electric dipole moment (nEDM) search at the Paul Scherrer Institute (PSI), called n2EDM. The setup is at room temperature in vacuum using ultracold neutrons. n2EDM features a large UCN double storage chamber design with neutron transport adapted to the PSI UCN source. The design builds on experience gained from the previous apparatus operated at PSI until 2017. An order of magnitude increase in sensitivity is calculated for the new baseline setup based on scalable results from the previous apparatus, and the UCN source performance achieved in 2016.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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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

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