TY  - CONF
AU  - Ondreka, David
AU  - Bozyk, Lars
AU  - Graeff, Christian
AU  - Spiller, Peter
AU  - Stadlmann, Jens
AU  - Volz, Lennart
A3  - Pilat, Fulvia
A3  - Fischer, Wolfram
A3  - Saethre, Robert
A3  - Anisimov, Petr
A3  - Andrian, Ivan
TI  - Slow extraction of a dual-isotope beam from SIS18
PB  - JACoW Publishing
M1  - GSI-2025-00401
SP  - 1698-1701 pages
PY  - 2024
N1  - Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license.
AB  - Recently, the heavy ion synchrotron SIS18 at GSI was for the first time operated with a dual-isotope beam, made up of 12C3+ and 4He+. Such a beam can be used to improve carbon radiotherapy by providing online information on dose deposition, where the helium ions serve as a probe beam traversing the patient while depositing a negligible dose. For this, the accelerator has to deliver a slowly extracted beam with a fixed fraction of helium over the spill. The difference in mass-to-charge ratio of 4He compared to 12C is small enough to permit simultaneous acceleration and to make the two isotopes practically indistinguishable for the accelerator instrumentation. Yet, it may cause a temporal shift between the two components in the spill owing to the sensitivity of slow extraction to tiny tune variations. We investigated different extraction methods, and examined the time-wise stability of the dual-isotope beam with a beam monitoring setup installed in the GSI biophysics experiment room. A constant helium fraction was obtained using transverse knock-out extraction with adjusted chromaticity.
T2  - 15th International Particle Accelerator Conference
CY  - 19 May 2024 - 24 May 2024, Nashville (USA)
Y2  - 19 May 2024 - 24 May 2024
M2  - Nashville, USA
KW  - Accelerator Physics (Other)
KW  - mc4-hadron-accelerators - MC4: Hadron Accelerators (Other)
KW  - MC4.A16 - MC4.A16 Advanced Concepts (Other)
LB  - PUB:(DE-HGF)8
DO  - DOI:10.18429/JACOW-IPAC2024-TUPS29
UR  - https://repository.gsi.de/record/357444
ER  -