Bezkorovaynyy, V.

Bleile, A.

Ceballos, J.

Cho, E. J.

Fischer, E.

Freisleben, W.

Joshi, N.

Körber, B.

Maroussov, V.

Marzouki, F.

Meier, J. P.

Meyer, S.

Mierau, Anna

Müller, H.

Raach, H.

Roux, C.

Schnizer, P.

Seifert, F.

Stafiniak, A.

Sugita, K.

Szwangruber, P.

Weiss, Harald

GSI Repository

Status of the superconducting magnets for FAIR∗E. Fischer† , V. Bezkorovaynyy, A. Bleile, J. Ceballos, E. J. Cho, W. Freisleben, N. Joshi, B. Ko¨rber,V. Maroussov, F. Marzouki, J. P. Meier, S. Meyer, A. Mierau, H. Mu¨ller, H. Raach, C. Roux,P. Schnizer, F. Seifert, A. Stafiniak, K. Sugita, P. Szwangruber, and H. WeissGSI, Darmstadt, GermanyIntroductionWithin this paper we report shortly on all the many dif-ferent activities of the group which now is mainly focusedon procuring the magnets and associated systems for theFAIR project. While many activities were pursued the suc-cessful tests of the SIS100 dipole magnet stick clearly out.Superconducting magnetsRapidly cycling magnets for SIS100Dipoles – production status and first tests The Firstof Series SIS100 main dipole was delivered last year and itstesting campaign has been conducted since December 2013with a successful cool down, measurement of the virginfield curve, required for field optimisation calculations, andfinished with a successful training.The coil structure was found to provide an insulation of3 kV already at the factory test. During the first run themagnet quenched slightly below the nominal current withthe second quench already above nominal field and reachedup to now a maximum current of 15.7 kA and thus showssufficient operation margin.The AC losses produced by the SIS100 main dipole mag-net are one of the main loads on the cyroplant. are wellbelow the expected value of 70 W for a triangular cycle of1 Hz. This is considered explainable by the choice of iron(M600-100A silicon steel), the superconducting low losswire with a CuMn matrix and extra inserts at the magnetends, foreseen for optimising the end field quality.The magnetic field was measured using: a hall probemounted on a mapper, a single stretched wire system, androtating coil probes at different locations [1, 2]. The fieldmeasured with these different systems gave results whichwere matching each other with sufficient accuracy and sec-ond the soundness of the measurement system design.So the overall tests of the magnets were successful:quench behaviour, magnetic field strength, AC losses. Themagnetic field was however a bit deteriorated. The me-chanical accuracy of the yoke assembly was investigatedwith appropriate gauges, which showed that the yoke me-chanics was slightly out of specifications. Based on thesemeasurements mitigation actions were discussed with the∗We acknowledge the support of the European Community-ResearchInfrastructure Activity under the FP7 program CRISP (Grant agreementno: 283745) Work Package 5. We acknowledge the support through theJINR–BMBF contract.† e.fischer@gsi.demanufacturer and will be tested and incorporated in the pro-duction beginning next year.Quadrupole modules Aside of the dipoles the mainquadrupoles together with all corrector and steerer mag-nets are assembled into so called units consisting of a mainquadrupole and up to two correctors. These quadrupoleunits will be produced and tested at cold temperature atJoint Institute for Nuclear Research (JINR). The collab-oration contract for production of quadrupole-, corrector-and steering magnets as well as the integration into units atJINR are finalised and will be signed in January 2015. Theunits are located within 83 quadrupole doublet modulessplit in 11 configurations and four basic classes with mod-ules located in the arc, the end of the straight section of theSIS100 machine. All these modules are currently designedin interaction with Babcock Noell Gmbh Wu¨rzburg / Ger-many. The integration of the modules has to fulfill demand-ing stability criteria of± 125 µm for the main quadrupoles,which makes the design challenging. The tendering pro-cess for the involved components and the integration ofmodules is in preparation and will be established also in2015.Rapidly cycling magnets for SIS300After manufacturing of a first dipole magnet in collab-oration with INFN, Italy, a second collared coil was builttogether with INFN and CERN in frame of the EU-CRISPproject. Ongoing is also the design work on wide aperturequadrupoles for FAIRs HEDgeHOB experiment by IHEPin Protvino, who had already successfully built SIS300quadrupole and corrector prototypes.Magnets of the Super-FRSThe specifications of the SuperFRS magnets were re-leased and the tender launched. The dipoles design hasbeen finalised by CEA/Saclay. The multiplets have beenthoroughly negotiated and the contract will be awardedsoon.TestingPrototype test facility activitiesWhile the magnet was produced in parallel the test facil-ity was upgraded so that all parameters of the magnet couldbe derived including an upgrade of the power converter andprocurement of HTS current leads.GSI SCIENTIFIC REPORT 2014 FG-SIS100-02DOI:10.15120/GR-2015-1-FG-SIS100-02 471The measurements of the field quality were made withthe mole, i.e. a rotating coil probe system with a motor op-erating inside the magnetic field. For series measurementsa measurement shaft will be used with cold coil probes astheir cores. Together with CERN a system was adapted formeasuring the magnetic field in cold conditions in vacuumand successfully tested. A shaft based on this principle willbe tested beginning next year.Series test facility activitiesThe seres test facility is being built up which is currentlymainly dedicated for testing the SIS100 dipoles. The cry-oinfrastructure including also the feed boxes have been pro-cured supervised by our colleagues of the cryo group andare currently being tested. It will provide 4 test benchesorganised in 2 clusters and allow testing the SIS100 string.At the beginning of the SIS100 series dipole testing allfour benches will be used for the tests of the dipole mag-nets. When the first of series quadrupole doublet will bedelivered to GSI one of the test benches will be used tooperate the string test [3].SIS100 quadrupole testsThe test facility at JINR for these magnets is currentlybeing built up. The first power converter is being assem-bled and will be commissioned soon. Each test bench isequipped with a satellite refrigerator for cooling down andoperating of the magnets. This concept simplifies the paral-lel operation of the test benches. Two satellite refrigeratorshave already been produced.Testing Super-FRS magnets at CERNThe cold tests of Super-FRS will be done at CERN undera collaboration agreement between CERN and GSI. Threetest benches, suitable for dipole magnets and multiplets re-spectively, will be available. This allows a continuous op-eration with one bench being cooled down, one cold andthe measurements running, and the third being warmed up.Given that these choices have been made now the hard-ware can be procured. CERN is already refurbished thenecessary cryogenic infrastructure and setting up the othernecessary test equipment as, for example, power convert-ers, quench detection systems, and systems for magneticmeasurements.Current leadsThe successful test of the first pair of HTS current of lastyear gave the green light to produce the second pair whichwas delivered this year and successfully tested. So the se-ries production of the current leads for the series test stationand the SIS100 machine was launched. Along with thishigh current current low current leads have been designed.A prototype has been procured that will be tested beginningnext year. For the γt-Jump-Quadrupole, a cold normal con-ducting magnet within a quadrupole doublet module, thedesign of current leads has been started. For the Hedgehobcollaboration 4 pairs of 6 kA HTS current leads shall beprocured. A specification is in preparation.Electrical systems and magnet protectionThe quench detection systems for the series test facilityhave been procured. While these systems could detect aquench reliably in the SIS100 machine, the required cableswould create too large parasitic capacitance. Therefore analternative based on transducers is currently under devel-opment.ConclusionAfter the procurement of the different superconductingmagnets has been started in 2013, the first SIS100 dipolewas tested thoroughly in 2014 and a new built chromatic-ity sextupole is ready now for testing as a first correctortype magnet. The dipole tests results proved that the mag-net design is sound and the requested operation parame-ters are achievable. In-depth technologic investigations ofthe yoke production process, supporting the manufacturer,have shown that the remaining problems can be solved byimproving the welding technology so that the specified tol-erances of the yoke geometry can be achieved. Thus a sec-ond yoke will be produced and the corrected first dipole isexpected to provide the required magnetic field accuracy.This will allow us launching the series production still in2015. The production of the other magnets was also pre-pared in 2014. The telegraphic style of this paper reflectsthe many activities that are undertaken to realise the FAIRproject within the given scope and schedule.References[1] P. Schnizer, E. Fischer, P. Akishin, J. P. Meier, A. Mierau,and A. Bleile. Advanced magnetic field description and mea-surements on curved accelerator magnets. In Proceedings ofIPAC2014, Dresden, Germany, 2014.[2] E. Fischer et al., Fast ramped superconducting magnets forFAIR – production status and first test results. IEEE T. Appl.Supercon., 2014. submitted for publication.[3] K. Sugita et al., String test preparation for the superconduct-ing SIS100 accelerator of FAIR. IEEE T. Appl. Supercon.,24(3):1–4, June 2014.[4] A. Bleile et al. Thermodynamic properties of the supercon-ducting dipole magnet of the SIS100 synchrotron. PhysicsPeriodica, 2014. submitted for publication.[5] E. Fischer et al. WEPRI083 IPAC2014, Dresden, Germany,2014.[6] H. Raach et al. 14 kA HTS current leads with one 4.8 Khelium stream for the prototype test facility at GSI. PhysicsPeriodica, 2014. submitted for publication.[7] P. Schnizer et al. Low temperature test capabilities for thesuperconducting magnets of FAIR. IEEE T. Appl. Supercon.,2014. submitted for publication.FG-SIS100-02 GSI SCIENTIFIC REPORT 2014472 DOI:10.15120/GR-2015-1-FG-SIS100-02

Status of the superconducting magnets for FAIR

http://repository.gsi.de/record/184183/files/FG-SIS100-02.pdf

Status of the superconducting magnets for FAIR

Abstract

Similar works

Full text

Available Versions

GSI Repository