Dresden 2014 – wissenschaftliches Programm

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BE: Beschleunigerphysik

BE 1: Hadron Accelerators and Colliders

BE 1.4: Gruppenbericht

Montag, 31. März 2014, 16:00–16:30, MOL 213

Reacceleration of Ion Beams for Higher Performance in Tumor-Therapy — •Christian Schömers, Andreas Peters, and Thomas Haberer — Heidelberger Ionenstrahl-Therapiezentrum

At the Heidelberg Ion-Beam Therapy Centre (HIT) cancer patients are treated using the raster-scanning method. A synchrotron provides pencil beams in therapy quality for 255 energy steps per ion type allowing to vary the penetration depth and thus to irradiate tumors slice-by-slice. So far, changing the beam energy necessitates a new synchrotron cycle, including all phases without beam extraction.

The no. of ions that can be accelerated in the synchrotron usually exceeds the required no. of ions for one energy slice. An intensity upgrade of the injector system will be investigated, to increase the no. of accelerated particles even more. The treatment time could be significantly reduced by reaccelerating or decelerating the remaining ions to the next energy level. By alternating acceleration and extraction phases several slices could be irradiated with only short interruptions.

Therefore the reacceleration of a transversally blown up beam * due to RF-knockout extraction * must be investigated, beam losses have to be minimized. To estimate the benefit of this operation mode, treatment time has been simulated and compared to the time achieved in the past. A reduction of up to 65 percent is possible and more patients can be treated! Simulations and first tests of a reaccelerated and extracted beam are presented.