Barth, W.

Clemente, G.

Groening, L.

Mickat, S.

Ratzinger, U.

Schlitt, B.

GSI Repository

The Status of the High-Energy Linac Project at GSI ∗S. Mickat1, W. Barth1, G. Clemente1, L. Groening1, B. Schlitt1, and U. Ratzinger21GSI, Darmstadt, Germany; 2Goethe University, Frankfurt, GermanyThe High-Energy (HE) Linac is proposed to substitutethe existing UNILAC post-stripper section. Mainly thepost-stripper consists of the Alvarez Linac, which is in op-eration over four decades successfully. The main parame-ters of the HE Linac follow the design parameters of the ex-isting post-stripper [1], e.g. the HE Linac reaches the sameoutput energy of 11.4 MeV/u at about half of the lentgh. Incomparison the beam pulse length and the pulse repetitionrate is optimised to the FAIR requirements. The HE Linacwill not provide with long duty cycle beams [2].In the long term the substitution of the existing Alvarez isthe only possibility to provide an adequate heavy ion injec-tor for FAIR. The need for a future substitution is confirmedby a study recording the status of the existing post-stripperfor investigating its future operating risk [3].One important milestone for reducing the operating riskis the development of a new and modularised rf system,which is in progress [4]. The rf system can be applied tothe existing Alvarez section as well as to the HE Linac inshort pulse operation. Negotiations with commercial sup-pliers concerning the prototype of a high power amplifierare expected to be closed in spring 2014.56 percent of the total costs are assigend to the rf systems(fig.1) according to the executive summary ”Proposal forthe HE Linac” [5], which was submitted in summer 2013to the GSI supervisory board and the director’s board.OutlookIn November 2013 the GSI accelerator chain for Ura-nium beam was reviewed. The review comittee comprisedfive external and international recognised accelerator ex-perts. As a result a window for the input beam parametersfor the SIS18 is defined. For providing 2 · 1011 U28+ par-ticles a beam current of 15 mA at a pulse length of 80 µswithin an emittance of 5 mm mrad is required for instance[6]. In addition a quasi Front-to-End simulation along theUNILAC shows, that by taking future upgrade options intoaccount already, with the existing Alvarez section the Fairrequirements are not reached [7]. Even by substituting theAlvarez section by the HE Linac the aim is not reached perse regarding the existing boundary conditions. Currentlyworkpackages are defined together with the Institute of Ap-plied Physics at Frankfurt University. Starting from the Ionsources to the SIS18 transfer channel every section is re-investigated for improvements in beam quality and inten-sity.∗FAIR@GSI PSP code:6-6-7-06Figure 1: Investment cost of technical susbsystems inMEUR and percent. The total sum is 26.6 MEUR (basedon prices of 2012)References[1] B. Schlitt et al., “Status of High Energy Linac Project at GSI”,GSI Scientific Report 2012 (2013) 270[2] S. Mickat et al., “Status of the sc cw LINAC at GSI”, ExoticNuclei, EXON-2012, Proceedings of the International Sym-posium (2013) 337[3] S. Mickat, H. Vormann et al., “Die UNILAC Post-StripperSektion - Zustandsaufnahme und Betriebsrisiko”, InternalReport (2013)[4] M. Hoerr, B. Schlitt, G. Schreiber, W. Vinzenz, W. Barth,Internal Note (2013)[5] B. Schlitt et al., “Proposal of a New Heavy Ion Post-StripperLinac at GSI (HE-Linac) - Executive Summary” (2013)[6] S. Appel, “SIS18 Injection: Parameters studies on MTI withspace charge and longitudinal aspects” talk at the Rev. ofFAIR Uranium Beam Parameters along the Accelerator Chain(2013)[7] L. Groening, “HE-Linac: Layout and preliminary (quasi)Front-to-End Simulations” talk at the Review of FAIR Ura-nium Beam Parameters along the Accelerator Chain (2013)FG-UNILAC-10 GSI SCIENTIFIC REPORT 2013306 doi:10.15120/GR-2014-1-FG-UNILAC-10

The Status of the High-Energy Linac Project at GSI

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The Status of the High-Energy Linac Project at GSI

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