Stuttgart 2012 – scientific programme
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A: Fachverband Atomphysik
A 2: Atomic systems in external fields I
A 2.8: Talk
Monday, March 12, 2012, 12:15–12:30, V57.05
Ionisation Dynamics and Ion Heating Processes of low-Z Ions in EBIS/T — •Erik Ritter and Günter Zschornack — Institute of Solid State Physics, Technische Universität Dresden, Germany
In the past 40 years, EBIS/T were primarily used in basic research to produce highly charged heavy ions. Hence the production of low-Z ions in EBIS/T has not been well investigated. It is well known, that there exist some difficulties in the physics of low-Z ion production, which have to be covered for the optimal operation conditions of EBIS/T systems. The interest in producing low-Z ions in EBIS/T permanently increase because, EBIS/T are expected to be an alternative approach for the ion production in medical particle therapy facilities.
This work presents investigations on the ionisation dynamics of H+ and H2+ ions but can also be applied for other low-Z ions. The ion losses from the ion trap are dominated by energy transfer processes of the produced low-Z ions from residual gas ions or heating by the electron beam. In order to examine these processes measurements of the ionisation dynamics and the energy spread of the extracted ions were done for different ionisation times/trap times (time resolved ion extraction). Thereby the dependence of fundamental ion source parameters such as gas pressure, electron beam current and electron energies were investigated. The results from a room temperature EBIS (B = 600 mT) and a super conductive EBIS (B = 6 T) are compared for proofing the effects on the electron beam current density.
This work is supported by the Federal Ministry of Economics and Technology (Project ZIM-KOOP KF2561301AB0).