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| TUPC095 |
Beam Diagnostics for Commissioning the HEBT and Gantry Sections of the HIT Medical Accelerator
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1281 |
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- M. Schwickert, A. Reiter
GSI, Darmstadt
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The HIT medical accelerator at Heidelberg, Germany, is the first dedicated heavy-ion cancer therapy facility in Europe, consisting of a two-stage injector Linac followed by a compact synchrotron. It features three treatment places: two horizontal beam lines, where treatment will be carried out from 2008 using proton and carbon beams, and the first 360° rotating heavy-ion Gantry structure. The accelerator sections of this facility were designed and constructed by GSI, which thereafter was in charge of the commissioning. By now, the required medical beam quality has been achieved in both horizontal beam lines, and beam commissioning of the Gantry structure has started. In this contribution we describe the technical layout of beam diagnostic devices and present measurement data taken in high-energy beam transport lines and patient treatment places.
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| TUPP127 |
Spill Structure Measurements at the Heidelberg Ion Therapy Centre
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1824 |
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- A. Peters, R. Cee, T. Haberer, T. Winkelmann
HIT, Heidelberg
- T. Hoffmann, A. Reiter, M. Schwickert
GSI, Darmstadt
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A specially designed accelerator facility for tumour irradiation located at the Heidelberg University Hospital was built up, the commissioning is still ongoing. Technically the Heidelberg Ion Therapy Center (HIT) fully relies on the three dimensional intensity-controlled rasterscan technique developed at GSI. This method demands for smoothly extracted ion beams (from protons to oxygen) from the HIT synchrotron. For this purpose a RF knock-out system consisting of a RF-exciter in combination with an electrostatic septum, two septum magnets and two sextupoles is used. To characterize the extracted beams scintillators for low intensities and ionization chambers for higher currents are installed in the high energy transport lines. Using a PXI-based DAQ system full spills are recorded with a time bin of 100 μs. Typical raw data will be shown as well as derived statistics like Fourier spectra and maximum-to-average ratios that proof the beam quality for its applicability to produce outstanding dose distributions via beam scanning. In addition, safety aspects like the performance of the spill interrupt procedure will be demonstrated with measured data.
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| TUPP131 |
Status of the Linac Components for the Italian Hadrontherapy Centre CNAO
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1833 |
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- H. Vormann, C. M. Kleffner, A. Reiter, B. Schlitt
GSI, Darmstadt
- G. Clemente, U. Ratzinger
IAP, Frankfurt am Main
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The IH-DTL for the Linac in the Italian National Center for Hadron Therapy in Oncology CNAO will accelerate different ion species (C4+, O6+,3He+, H2+) to an energy of 7 MeV/u. The combined rebunching and accelerating beam dynamic concept ("KONUS", "Kombinierte Null Grad Struktur", combined zero degree structure) requires a real voltage distribution in all 56 accelerator gaps (distributed in 4 sections) matching very close to the design voltage distribution. The tuning of the mechanically finished and copper plated cavity started in January 2007, based on the experience from the similar IH-DTL for the HIT linac ("Heidelberger Ionenstrahl-Therapiezentrum", the Heidelberg ion beam therapy center). Very small differences in mechanical measures caused modified starting conditions, resulting in varying number and shape of fixed tuners, but nevertheless accurate field distribution. The CNAO Linac is at presently under commissioning, all linac components except the IH-DTL have been delivered to the center in November 2007.
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