Abstract.
The LPCTrap experiment uses an open Paul trap which was built to enable precision measurements in the beta decay of radioactive ions. The initial goal was the precise measurement of the beta-neutrino angular correlation coefficient in the decay of 6He . Its geometry results from a careful optimization of the harmonic potential created by cylindrical electrodes. It supersedes previously considered geometries that presented a smaller detection solid angle to the beta particle and the recoiling ion. We describe here the methods which were used for the potential optimization, and we present the measured performances in terms of trapping time, cloud size and temperature, and space charge related limits. The properties of the ion cloud at equilibrium are investigated by a simple numerical simulation using hard sphere collisions, which additionally gives insights on the trapping loss mechanism. The interpretation for the observed trapping lifetimes is further corroborated by a model recently developed for ion clouds in Paul traps. The open trap shall serve other projects. It is currently used for commissioning purpose in the TRAPSENSOR experiment and is also considered in tests of the Standard Model involving the beta decay of polarized 23Mg and 39Ca ion in the frame of the MORA experiment. The latter tests require in-trap polarization of the ions and further optimization of the trapping and detection setup. Based on the results of the simulations and of their interpretation, different improvements of the trapping setup are discussed.
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References
G. Ban et al., Ann. Phys. (Berlin) 525, 576 (2013)
M. Gonzalez-Alonso, O. Naviliat-Cuncic, N. Severijns, Prog. Part. Nucl. Phys. 104, 165 (2019)
R.E. March, J.F.J. Todd, Quadrupole Ion Trap Mass Spectrometry, in Chemical Analysis, a series of monographs on analytical chemistry and its applications, edited by J.D. Winefordner (Wiley, 2005)
R. Alheit, C. Henning, R. Morgenstern, F. Vedel, G. Werth, Appl. Phys. B 61, 277 (1995)
P. Delahaye et al., Hyperfine Interact. 132, 475 (2001)
P. Delahaye, PhD Thesis (University of Caen Basse-Normandie, 2002)
P. Delahaye, A new Paul trap geometry for a measurement of $\beta$-$\nu$ angular correlation in ^6He decay, poster presented at the HCI Conference, Caen (2002)
D. Manura, D. Dahl, SIMION (R) 8.0 User Manual (Scientific Instrument Services, Inc., Ringoes, NJ, 2008) http://simion.com/
P.H. Dawson, Quadrupole Mass Spectrometry and its Applications (American Vacuum Society Classics, 1976)
D. Rodriguez, A. Méry, G. Ban, J. Brégeault, G. Darius, D. Durand, X. Fléchard, M. Herbane, M. Labalme, E. Liénard et al., D. Nucl. Instrum. Methods Phys. Res. A 565, 876 (2006)
X. Fléchard, Ph. Velten, E. Liénard et al., J. Phys. G: Nucl. Part. Phys. 38, 055101 (2011)
W.H. Press, S.A. Teukolsky, W.T. Vetterling, B.P. Flannery, Numerical recipies in C, second edition (Cambridge University Press, 1992)
L.A. Viehland, E.A. Mason, At. Nucl. Data Tables 60, 37 (1995)
X. Fabian, F. Mauger, G. Quéméner, Ph. Velten, G. Ban, C. Couratin, P. Delahaye, D. Durand, B. Fabre, P. Finlay et al., Hyperfine Interact. 235, 87 (2015)
X. Fabian, PhD Thesis (University of Caen), HAL Id: tel-01288412
P. Delahaye, Eur. Phys. J. A 55, 83 (2019) arXiv:1810.09121 [physics.plasm-ph]
F.G. Major, H.G. Dehmelt, Phys. Rev. 170, 91 (1968)
X. Fléchard, G. Ban, D. Durand, E. Liénard, F. Mauger, A. Méry, O. Naviliat-Cuncic, D. Rodriguez, P. Velten, Hyperfine Interact. 199, 21 (2011)
R. Moszynski et al., J. Chem. Phys. 6, 4697 (1994)
E. Liénard, G. Ban, C. Couratin, P. Delahaye, D. Durand et al., Hyperfine Interact. 236, 1 (2015)
P. Delahaye, E. Liénard, I. Moore et al., Hyperfine Interact. 240, 63 (2019)
G. Neyens et al., Phys. Rev. Lett. 94, 022501 (2005)
M. Kowalska et al., Phys. Rev. C 77, 034307 (2008)
M. Schwarz et al., Rev. Sci. Instrum. 83, 083115 (2012)
S. Schwarz et al., Nucl. Instrum. Methods B 204, 474 (2003)
J.M. Cornejo, P. Escobedo, D. Rodríguez, Hyperfine Interact. 227, 223 (2014)
J.M. Cornejo et al., Rev. Sci. Instrum. 86, 103104 (2015)
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Communicated by K. Blaum
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated during this study are contained in this published article. The results of the calculations shown here can be easily reproduced using similar numerical methods.]
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Delahaye, P., Ban, G., Benali, M. et al. The open LPC Paul trap for precision measurements in beta decay. Eur. Phys. J. A 55, 101 (2019). https://doi.org/10.1140/epja/i2019-12777-3
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DOI: https://doi.org/10.1140/epja/i2019-12777-3