| Paper |
Title |
Page |
| WEPP079 |
Beam Dynamics Layout and Loss Studies for the FAIR P-Injector
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2701 |
| |
- G. Clemente, L. Groening
GSI, Darmstadt
- S. Minaev
ITEP, Moscow
- U. Ratzinger, R. Tiede
IAP, Frankfurt am Main
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The development of coupled CH-DTL cavities represents a major achievement in the development of the 325 MHz, 70 MeV FAIR P-Injector. This coupled-cavity solution has important consequencies on the beam dynamics design which has to be adapted to this new kind of resonator. In combination with the KONUS beam dynamics, this solution allows to achieve all the requirements of the FAIR project in terms of beam intensity and quality reducing at the same time the number of focusing elements along the machine. A layout based on 6 CH coupled modules is presented and compared with a solution composed of three coupled modules up to 35 MeV followed by three long single resonators up to the energy of 70 MeV. A redesigned 35 MeV intertank section became necessary to avoid beam losses and emittance growth. Finally, the effect of random mistakes such as quadrupole misalignments and phase as well as voltage setting errors have been investigated to determine the tolerances of mechanical construction and rf controls during operation.
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| TUPP131 |
Status of the Linac Components for the Italian Hadrontherapy Centre CNAO
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1833 |
| |
- 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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