Autor: Chiu, P.-J. - Prolib Integro

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Tytuł:: Data blinding for the nEDM experiment at PSI
Autorzy:: Emmenegger, S.
Kermaïdic, Y.
Krempel, J.
Ferraris-Bouchez, L.
Ries, D.
Leredde, A.
Chanel, E.
Bison, G.
Daum, M.
Roccia, S.
Hild, N.
Ban, G.
Bondar, V.
Lemiere, Y.
Naviliat-Cuncic, O.
Rozpędzik, Dagmara
Weis, A.
Lauss, B.
Schnabel, A.
Ayres, N. J.
Grujić, Z.
Kasprzak, M.
Pignol, G.
Rienäcker, I.
Zsigmond, G.
Lefort, T.
Piegsa, F. M.
Wursten, E.
Virot, R.
Kozela, A.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Crawford, C. B.
Chiu, P.-J.
Mohanmurthy, P.
Rebreyend, D.
Harris, P. G.
Flaux, P.
Kirch, K.
Rawlik, M.
Komposch, S.
Pais, D.
Hommet, J.
Zejma, Jacek
Mtchedlishvili, A.
Opis:: Psychological bias towards, or away from, prior measurements or theory predictions is an intrinsic threat to any data analysis. While various methods can be used to try to avoid such a bias, e.g. actively avoiding looking at the result, only data blinding is a traceable and trustworthy method that can circumvent the bias and convince a public audience that there is not even an accidental psychological bias. Data blinding is nowadays a standard practice in particle physics, but it is particularly difficult for experiments searching for the neutron electric dipole moment (nEDM), as several cross measurements, in particular of the magnetic field, create a self-consistent network into which it is hard to inject a false signal. We present an algorithm that modifies the data without influencing the experiment. Results of an automated analysis of the data are used to change the recorded spin state of a few neutrons within each measurement cycle. The flexible algorithm may be applied twice (or more) to the data, thus providing the option of sequentially applying various blinding offsets for separate analysis steps with independent teams. The subtle manner in which the data are modified allows one subsequently to adjust the algorithm and to produce a re-blinded data set without revealing the initial blinding offset. The method was designed for the 2015/2016 measurement campaign of the nEDM experiment at the Paul Scherrer Institute. However, it can be re-used with minor modification for the follow-up experiment n2EDM, and may be suitable for comparable projects elsewhere.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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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

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Skocz do pozycji: 7.

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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Skocz do pozycji: 8.

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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Skocz do pozycji: 9.

Tytuł:: A large 'Active Magnetic Shield' for a high-precision experiment
Autorzy:: Virot, R.
Lefort, T.
Rienäcker, I.
Piegsa, F. M.
Daum, M.
Bouillaud, T.
Kirch, K.
Rawlik, M.
Severijns, N.
Rozpędzik, Dagmara
Mullan, P.
Naviliat-Cuncic, O.
Zejma, Jacek
Ban, G.
Emmenegger, S.
Bondar, V.
Bison, G.
Fertl, M.
Fratangelo, A.
Roccia, S.
Doorenbos, C. B.
Chiu, P. -J.
Chen, J.
Ries, D.
Shelton, T.
Yazdandoost, N.
Zsigmond, G.
Pignol, G.
Chen, W.
Kletzl, V.
Ayres, N. J.
Schnabel, A.
Griffith, W. C.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Abel, C.
Grujic, Z. D.
Segarra, E. P.
Tavakoli Dinani, R.
Harris, P.
Svirina, K.
Koss, P. A.
Ferraris-Bouchez, L.
Saenz-Arevalo, W.
Thorne, J.
Pais, D.
Ziehl, N.
Crawford, C. B.
Chanel, E.
Krempel, J.
Opis:: We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5 m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about 10$^{5}$ for its inner sensitive volume. The AMS consists of a system of eight complex, feedback-controlled compensation coils constructed on an irregular grid spanned on a volume of less than 1000 m$^{3}$ around the MSR. The AMS is designed to provide a stable and uniform magnetic-field environment around the MSR, while being reasonably compact. The system can compensate static and variable magnetic fields up to $\pm$ 50μT (homogeneous components) and $\pm$ 5μT/m (first-order gradients), suppressing them to a few μT in the sub-Hertz frequency range. The presented design concept and implementation of the AMS fulfills the requirements of the n2EDM experiment and can be useful for other applications, where magnetically silent environments are important and spatial constraints inhibit simpler geometrical solutions.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments
Autorzy:: Bowles, D.
Lejuez, A.
Lefort, T.
Li, R.
Rienäcker, I.
Piegsa, F. M.
Pacura, Sebastian
Bouillaud, T.
Kirch, K.
Rebreyend, D.
Severijns, N.
Rozpędzik, Dagmara
Mullan, P.
Naviliat-Cuncic, O.
Harris, P. G.
Ban, G.
Zejma, Jacek
Emmenegger, S.
Chiu, P.-J.
Bondar, V.
Bison, G.
Fertl, M.
Fratangelo, A.
Roccia, S.
Doorenbos, C. B.
Yazdandoost, N.
Ries, D.
Zsigmond, G.
Crawford, C. B.
Pignol, G.
Chen, W.
Kletzl, V.
Ayres, N. J.
Schnabel, A.
Griffith, W. C.
Vankeirsbilck, J.
Schmidt-Wellenburg, P.
Bodek, Kazimierz
Lauss, B.
Tavakoli Dinani, R.
Grujic, Z. D.
Segarra, E. P.
Svirina, K.
Voigt, J.
Saenz-Arevalo, W.
Thorne, J.
Pais, D.
Ziehl, N.
Chanel, E.
Krempel, J.
Opis:: High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optimized procedure results in a residual magnetic field that has been reduced by a factor of two. The ultra-low field is achieved with the full magnetic-field-coil system, and a large vacuum vessel installed, both in the MSR. In the inner volume of $\sim$ 1.4 m$^{3}$, the field is now more uniform and below 300 pT. In addition, the procedure is faster and dissipates less heat into the magnetic environment, which in turn, reduces its thermal relaxation time from 12h down to 1.5h.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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