Speaker
Description
A mixed C/He ion beam with varying helium fraction has been investigated at GSI to study a new mode of image guidance for carbon ion beam therapy. “Mixed” refers to a beam with C and He ions extracted simultaneously from a single ion source (CAPRICE ECR) provided for the subsequent UNILAC-SIS18 accelerator complex during two previous beam times (¹²C³⁺/⁴He⁺ beam). Both ion species were simultaneously accelerated and extracted from SIS18 and characterised in the biophysics cave. Further combinations (¹²C³⁺/⁴He⁺ and ¹²C⁴⁺/³He⁺ from CH4 or CO2) were investigated at the ECR test bench with respect to beam currents, stability, and the C-to-He fraction, as determined by optical emission spectroscopy and mass spectrometry. All configurations met the requirements, but some with a residual oxygen contamination. The sequential injection of two different, i.e. “dual” ion beams, and the simultaneous acceleration and extraction, were successfully demonstrated at the UNILAC-SIS18. This opens the way for new modes of dual C/He oxygen-free beam operation. Some concepts are discussed for providing C/He ion beams for future beam times; either from two separate ion sources or a single ion source.
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