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Dynamics of charge evolution in glass capillaries for 230-keV Xe23+ ions
Cassimi A., Ikeda T., Maunoury L., L. Zhou C., Guillous S. et al
Physical Review A 86 (2012) 062902 - http://hal.in2p3.fr/in2p3-00761360
Physique/Physique/Physique Atomique
Dynamics of charge evolution in glass capillaries for 230-keV Xe23+ ions
A. Cassimi1, T. Ikeda, L. Maunoury2, C. L. Zhou1, S. Guillous1, A. Mery1, H. Lebius1, A. Benyagoub1, C. Grygiel1, H. Khemliche3, P. Roncin3, H. Merabet, J.A. Tanis1
1 :  CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Ecole Nationale Supérieure d'Ingénieurs de Caen – Université de Caen Basse-Normandie – CNRS : UMR6252 – CEA : DSM/IRAMIS
CIMAP - UMR 6252, Bd H. Becquerel BP 5133 14070 Caen-cedex 5
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
3 :  ISMO - Institut des Sciences Moléculaires d'Orsay
CNRS : UMR8214 – Université Paris XI - Paris Sud
Université Paris-Sud 91405 Orsay cedex
We have measured the transmission of 230-keV (10-keV/q) Xe23+ ions through insulating tapered glass capillaries of microscopic dimensions. The dynamics of charging and discharging processes have been investigated, evidencing an unexpected slow alignment of the beam along the capillary axis. Oscillations of the exiting beam position have been observed during the charging process associated to the formation of charge patches on the capillary inner walls. The emerging ions are guided with a characteristic guiding angle falling on a universal curve proposed for PET polymer nanocapillaries. This result, very similar to the channeling process, is somewhat surprising in view of the significant differences between the straight nanocapillary polymer foils and the tapered microscopic single glass capillary used here. The transmitted ions show no evidence of energy loss or charge changing except for the production of a small neutral fraction that was determined to be due to ions that had become neutralized to form atoms rather than due to photon emission. These results thus test and confirm the validity of transmission and guiding and provide insight into the dynamics of higher-energy ions than have been previously studied in this regard, allowing a determination of the maximum energy for which the guiding process might occur.

Articles dans des revues avec comité de lecture
Physical Review A (Phys. Rev. A)
Publisher American Physical Society
ISSN 1050-2947 (eISSN : 1094-1622)

GANIL 2012-125 N
61.85.+p, 34.50.Fa, 34.35.+a
Expérience GANIL/ARIBE