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Type Seminar
La physique dans tous ses états
Date May 24 > 24, 2022 - 11h
Time 11h
Location GANIL, Guest House
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First in-gas laser spectroscopy with S3-LEB

by Anjali Ajayakumar

Ajayakumar1, Y.Balasmeh2, L. Caceres1, A. Claessens4, P. Delahaye1, W.Dong3, R. Ferrer4, X. Fléchard2, S. Franchoo3, S. Geldhof1, N. Lecesne1, R. Leroy1, V.Manea3, I.Moore5, A. Ortiz-Cortes1, J. Romans4, A. Roubin4, H. Savajols1, S.Sels4, P. Van Duppen4, K.Wendt6

1GANIL, CEA/DRF-CNRS/IN2P3, B.P. 55027, 14076 Caen,
2Normandie Université, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, F-14000 Caen, France
3IIJCLab, Université Paris-Sud 11, CNRS/IN2P3 91406 Orsay
4KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
5University of Jyväskylä, FI-40014 University of Jyväskylä,Jyväskylä, Finland
6Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany

Abstract: The S3-LEB (Super Separator Spectrometer-Low Energy Branch) is a low energy radioactive ion beam installation dedicated to the study of exotic nuclei, which is currently under commissioning as a part of the GANIL-SPIRAL2 facility [1]. High intensity primary beams delivered by the superconducting LINAC of SPIRAL 2 will allow increased production rates of nuclei by fusion evaporation reactions and thus will facilitate the exploration of the neutron-deficient and heavy-mass extremes of the nuclear chart. The reaction products will be separated by the recoil separator S3 and will be delivered to the LEB installation coupled to the S3 focal plane [2].

S3-LEB is a gas cell setup where the radioactive ions of interest are thermalized, neutralized and then selectively laser ionized either inside the gas cell or in a hypersonic gas jet environment created after the gas cell using a De-Laval nozzle. It is then followed by radiofrequency quadrupole ion guides, which allows efficient transmission of the ions to a Multi-Reflection Time of Flight Mass Spectrometer (MR-TOF MS) for further beam purification and detection. First offline results from S3-LEB were published recently presenting the commissioning of laser systems and conditions for optimum operation of the ion guides obtained using an alkali ion source [3].

We present the progress in the offline commissioning of the S3-LEB setup. The first laser spectroscopy in the gas cell, as well as the transport of laser ions, bunching and trapping in the MR-TOF MS will be presented For the offline commissioning, Er laser ions which is one the day 1 campaign case, are produced by heating a filament installed in the gas cell for the offline commissioning.

[1] Grand Accélérateur National d’Ions Lourds, URL: https://www.ganil-spiral2.eu/en/
[2] F. Déchery et al., Eur. Phys. J. A 51, 66 (2015), URL: https://doi.org/10.1140/epja/i2015-15066-3
[3] J.Romans et al., Atoms, 10, 21 (2022) URL : https://doi.org/10.3390/atoms10010021