Dresden 2017 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: Poster Session

AKBP 6.8: Poster

Mittwoch, 22. März 2017, 18:30–20:00, P4

Alvarez DTL Cavity Design for the UNLAC Upgrade — •Xiaonan Du¹, Lars Groening¹, Sacha Micakt¹, and Anja Seibel^1,2 — ¹GSI, Darmstadt, Germany — ²Frankfurt University of Applied Sciences, Frankfurt, Germany

The GSI UNILAC upgrade project includes the replacement of the existing post-stripper drift tube linac (DTL). In this project, our goal is to provide a complete design for the new Alvarez-type cavities to achieve the same acceleration within the same total rf-length as before. In order to improve the performance of the cavities, the tube shape is specifically designed to obtain a more homogeneous surface field w.r.t. the existing layout, thus lowering the peak surface field being equivalent to an increase of the shunt impedance. A tuning method was developed to stabilize the cavity with dedicated stem configurations. The beta profile design is performed with cell by cell simulation of 3D models, which provide accurate energy gain and other rf-parameters for every cell. The acceleration from 1.4 MeV/u to 11.4 MeV/u will be provided by five tanks with different tube shapes and average axial electric field. Details of the DTL design are reported in this paper.