Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.30: Poster

Donnerstag, 13. März 2008, 14:00–16:00, Poster C3

Development of a thermal ionizer as ion catcher — •Emil Traykov, Otto Dermois, Duurt-Jan van der Hoek, Klaus Jungmann, Wilbert Kruithof, Aran Mol, Gerco Onderwater, Marlene di Silva, Moslem Sohani, Oscar Versolato, Lorenz Willmann, and Hans Wilschut — Kernfysisch Versneller Instituut, University of Groningen

An effective ion catcher is an important part of a radioactive beam facility that is based on in-flight production. The catcher stops fast radioactive products and emits them as singly charged slow ions. Current ion catchers are based on stopping in He gas. However, with increasing intensity of the secondary beam the amount of ion-electron pairs created eventually prevents the electromagnetic extraction of the radioactive ions from the gas cell. In contrast, such limitations are not present in thermal ionizers used with the ISOL production technique. Therefore, at least for alkaline and alkaline earth elements, a thermal ionizer should then be preferred. An important use of the TRIµP facility at KVI will be for precision measurements using atom traps. Atom trapping is particularly possible for alkaline and alkaline earth isotopes. Therefore, we have built and tested a thermal ionizer. Using a radioactive beam of ²¹Na of about 20 MeV/nucleon, the temperature dependence and throughput of the ionizer catcher was characterized. The results will be presented.