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Wyświetlanie 1-10 z 11
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
Artykuł
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
Inne
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:
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 11

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