HIAT2015 - List of Authors (Tiede, R.)

Paper	Title	Page
TUA1I02	Upgrade of the UNILAC for FAIR	139
	L. Groening, A. Adonin, W.A. Barth, X. Du, R. Hollinger, E. Jäger, M. Kaiser, S. Mickat, A. Rubin, P. Scharrer, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao, C. Zhang GSI, Darmstadt, Germany Ch.E. Düllmann HIM, Mainz, Germany H. Hähnel, U. Ratzinger, A. Seibel, R. Tiede IAP, Frankfurt am Main, Germany
	The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. In order to meet the requirements for the upcoming FAIR project the machine has to be revised. A dedicated uranium source branch is under design. It has to provide up to 20 emA of 238U⁴⁺ at 2.2 keV/u to the entrance of the RFQ. The latter needs to be re-designed aiming at lower electric surface fields for sparking mitigation. The operational flexibility of the subsequent MEBT will be enhanced. We report on recent achievements on enhancing the stripping efficiency from U⁴⁺ to U²⁸⁺ by employing a pulsed jet of hydrogen gas. The stripper section may also include an option to provide a round-to-flat adapter shrinking the horizontal emittance at the expense of the vertical one. The existing post-stripper DTL is in operation since 40 years and will be fully re-designed. An optimized drift tube shape increases the shunt impedance, varying stem orientations shall mitigate parasite rf-modes, and asymetric and enhanced quadrupole focusing will preserve the beam flatness. The contribution will describe the various upgrade measures.
	Slides TUA1I02 [4.477 MB]
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Paper

Title

Page

Upgrade of the UNILAC for FAIR

139

L. Groening, A. Adonin, W.A. Barth, X. Du, R. Hollinger, E. Jäger, M. Kaiser, S. Mickat, A. Rubin, P. Scharrer, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao, C. Zhang
GSI, Darmstadt, Germany
Ch.E. Düllmann
HIM, Mainz, Germany
H. Hähnel, U. Ratzinger, A. Seibel, R. Tiede
IAP, Frankfurt am Main, Germany

The UNIversal Linear Accelerator (UNILAC) at GSI has served as injector for all ion species from protons for uranium for the past four decades. In order to meet the requirements for the upcoming FAIR project the machine has to be revised. A dedicated uranium source branch is under design. It has to provide up to 20 emA of 238U⁴⁺ at 2.2 keV/u to the entrance of the RFQ. The latter needs to be re-designed aiming at lower electric surface fields for sparking mitigation. The operational flexibility of the subsequent MEBT will be enhanced. We report on recent achievements on enhancing the stripping efficiency from U⁴⁺ to U²⁸⁺ by employing a pulsed jet of hydrogen gas. The stripper section may also include an option to provide a round-to-flat adapter shrinking the horizontal emittance at the expense of the vertical one. The existing post-stripper DTL is in operation since 40 years and will be fully re-designed. An optimized drift tube shape increases the shunt impedance, varying stem orientations shall mitigate parasite rf-modes, and asymetric and enhanced quadrupole focusing will preserve the beam flatness. The contribution will describe the various upgrade measures.

Slides TUA1I02 [4.477 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)