Eisel, T.

Kauschke, M.

Kollmus, H.

Schroeder, Claus

Streicher, B.

GSI Repository

Cryogenics for SIS100 Accelerator∗B. Streicher1, T. Eisel1, M. Kauschke1, C. Schroeder1, and H. Kollmus11CSCY, GSI, Darmstadt, GermanyIntroductionThe cryogenic system for the FAIR (Facility for Antipro-ton and Ion Research) superconducting (SC) SIS100 syn-chrotron (see Figure 1) can be divided into six sections.Each of these sections will be fed from a separate Feed Box(FB) which will supply liquid helium (LHe) for magnet,vacuum chamber and bus-bar cooling as well as gaseoushelium (GHe) for thermal shield cooling. Each sixth of thering consists of one cold arc and a straight warm sectionwith normal conducting accelerating cavities. Yet the warmsection still needs to include three SC quadrupole doublets.The design progress of the cryogenic system for the SIS100is described in the following sections.Figure 1: Schematic representation of SIS100 synchrotronshowing six BPL sections.Cryogenic SystemBy-pass Lines (BPLs) bypass each of the six straightwarm sections of SIS100 to supply LHe and cold electri-cal connections to the SC quadrupole doublets within thesesections. Each of the six by-pass sections is alternatelyequipped either with the FB or the End Box (EB) whichintercepts the helium flow. The purpose of such an infras-tructure is to be able to separate the ring into six sectionswhich can be independently cooled down, warmed up andserviced. Detailed technical specification [1] concerningthe BPL System was prepared and approved at GSI in 2013.Based on this, the in-kind contract was signed betweenFAIR and Wroclaw University of Technology (WUT). In∗FAIR@GSI PSP code: 2.8.12 and 2.14.8.1.6conjunction with the cryogenic group CSCY, the WUT iscurrently preparing a complete technical solution of theproposed BPL System. Internal holding structure for bothhelium headers and bus-bars is being designed as well asnew clamping solution to fix the bus-bar pairs. The mostcomplicated components namely the connection boxes thatinterface BPL to quadrupole units and on both sides to thecold arcs are also being engineered. The WUT will man-ufacture all the components of the BPL sections accordingto specifications until the end of 2016.During 2014 all technical specifications of all remainingcryogenic components for SIS100 namely the FBs, Cur-rent Lead Boxes (CLBs), Feed-in Lines (FILs) and Feed-in Boxes (FIBs) together with all the interfaces will bespecified. These components will also be produced withinthe in-kind collaboration with WUT. First-of-series compo-nents delivered to GSI will be tested within the Serial TestFacility (STF) currently under construction. The test of theSIS100 ”Mini String” (MS) will provide the opportunityto assemble and test a small scale model of SIS100 cryo-genic infrastructure. It will be composed of two SC mag-nets representing the cold arc section joined with the smallpart of the BPL section. This MS will be fed from the FBjoined together with the CLB to supply LHe and two pairsof cooled SC bus-bars for both magnets. The FB in ques-tion will be supplied using STF cold box manufactured byLinde Cryotechnik. The control system for the MS has tobe also developed at GSI based on UNICOS platform.Serial Test Facility for SC MagnetsIn order to test the fast-ramped SC magnets for FAIR,a cryogenic test facility is designed and currently underconstruction at GSI. The overall capacity of the cryo plantis 1.5 kW @ 4.4 K equivalent and can be distributed tofour test benches individually. In total 108 dipoles for theSIS100 will be tested at cold. The capacity of the cryo-genic system is designed in a way, that one magnet can becooled down and another magnet can be kept at cold forthe measurements in the same time. The other two testbenches serve for warming up and for magnet exchange,respectively. Beyond the dipoles, the high flexibility of theset-up allows also the testing of other FAIR magnets, likethe SIS100 quadrupole modules or the operation of a stringconfiguration.References[1] https://edms.cern.ch/document/1261140/8GSI SCIENTIFIC REPORT 2013 FG-SIS100-02doi:10.15120/GR-2014-1-FG-SIS100-02 FAIR@GSI 325

Cryogenics for SIS100 Accelerator

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Cryogenics for SIS100 Accelerator

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