Fusion Programme - ENEA - Fusione

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Fusion Programme19.5Section view B-Bscale 3:119.51Section view A-Ascale 3:15331.765310.6215.519.5 15.51.75(NHFML) Talahassee (USA)facilities for testing. It wasdecided to involve more than onelaboratory in order to get resultsas fast as possible and therebyhave the minimum delay insetting up EDIPO. ENEA’sparticipation involved bothmanufacturing the cables as wellas preparing the samplesaccording to the specificgeometry required from eachtesting facility. Table 4.I gives thefabrication parameters of the firstbatch of samples delivered toSULTAN; fig. 4.2 reproduces thesample geometry for theconductors tested at NHFML[4.1,4.2,4.3].Section viewscale 3:1Section view C-Cscale 3:131.7626.52 27.38Isometric viewscale 3:5Fig. 4.2 - Sample geometry for testing CICC cables at NHFML (units in mm)DIPCON. Based on the positiveresults obtained during thePITCON measurementcampaign and the relative gain ofthe parameters defined, the finalprocessing of the dipole dummycables was carried out in thesecond half of 2007. A full set oftwo high-field-region and fivelow-field-region conductors, for atotal length of slightly less than1 km, was manufactured anddelivered for winding tests toBabcock Noell GmbH(Germany), responsible for thecoil construction. In addition tocable manufacturing, ENEAundertook gas-flow/helium-leakmeasurements and developedspecial conductor terminations for tight sealing of the cables. After the results of the Babcock Noell windingtests, the definitive dipole cables will be produced and the activity is expected to end within June 2008.2007 Progress Report78In the framework of magnet R&D, EFDA involved ENEA in a research programme on theSimulation development and validation of detailed simulation tools. The activities, aimed at increasing thecodes prediction capability of conductor performance, were split into different tasks and developedwith the support of Padua, Udine and Bologna Universities, Turin Polytechnic, the CREATEConsortium and the Italian company of L.T. Calcoli S.r.l.Considering the particular structural characteristics ofthe ITER CICCs, a specific campaign was started toinvestigate the influence of the geometric parameters[4.1] P. Bauer et al., Proposal for critical current testing ofCICC cables for the EFDA dipole project at theNHMFL split solenoid facility, EFDA CSU Garching(March 2007)
4. Superconductivity2007 Progress ReportTable 4.I - Set of parameters of batch #1 samples on conductor stiffness at differentcabling sub-stage levels because theConductor PITSAM1 LF1 HF3 superconducting performance ofNb 3 Sn strands is very sensitive toCable pattern 3×3×4×4 3×3×3×4 3×3×4×4mechanical strain. By means ofSc strand OST 8712-2finite–elements analysis, with detailedSc strand number 144 48 144 3D nonlinear cable representation, itCu/non Cu (0/9×4×4 (5/4)×3×4 (0/9)×4×4 was proved that variations inTwist pitches (mm) 58/95/139/213twist–pitch and void fraction provokeOuter dimensions (mm) 21.1×9.5 12.6×12.6 20.3×10.3 considerable changes in thelongitudinal and bending stiffness ofJacket thickness (mm) 1.6 1.75 1.6the cable sub-stage. FurtherEstimated void fraction (%) 30 35 35 developments of the simulationmodels, together with an experimentalprogramme to complete thevalidation, are in progress and will lead to the simulation of the entire last-but-one cabling stage of the ITERtoroidal-field conductor.In support of the final design of the new EFDA dipole Nb 3 Sn coil, ENEA was assigned the task ofdeveloping a model capable of evaluating the strain state of the strands inside the conductor. Thefinite–elements code ABAQUS was used to study the conductor cabling, including twisting andcompaction, cool-down from the heat-treatment temperature to the operative cryogenic temperature, andthe mechanical loads due to Lorentz forces in operative conditions. Two different models were considered:a) beam-like model; b) solid model. Different levels of discretization were adopted to identify also thecorrect strain distribution within the strand cross section, based on the bending and axial strain distributionobtained from analysis at conductor scale. All the simulations were performed on the different layoutsproposed by EFDA for the high-field and low-field conductors. A sensitivity analysis was applied to theEDIPO low-field conductor, with variable cabling twist pitch (TP) and fixed void fraction (TMSC-CODVAL).Results indicate that the configurations with a short TP have a total tensile strain (TS) lower than the longTP configurations, suggesting that the short TP sample has better transport performance.In order to have the simulations adhere to the physical reality, a nonlinear constitutive relation based onexperimentally measured stress-strain curves was adopted for the strand behaviour. The final results of theactivity concluded the conductor design optimisation (TMSC-DICOMO).At the same time, numerical techniques were used to tackle the problem of crack propagation in theEDIPO insulating resin which de-bonds at the conductor interface (TMSC-CODVAL). The dipole insulationwas studied in a 2D model at T=4.2 K and nominal current, and a maximum shear stress of 80 MPa wasobtained, which is within the acceptable limit of 100 MPa. Work is in progress for a full detailed 3D model.Push out tests will be performed at 4.2 K.A 3D nonlinear electromagnetic code is being used to investigate the em behaviour of the ITER poloidalfield full-size conductor. Simulation of the poloidal field insert sample (PFIS) experimental characterisationcampaign performed at the SULTAN facility in 2004 includes development of an ad hoc model for theterminations and bottom joint and a review of the input parameters used in the code. Thermal parametersensitivity analysis is in progress and first results are promising. A new code for nonlinear ‘fast’ analyses isbeing tested and will be used for a comparison with the results that will be obtained in 2008 from thepoloidal field conductor insert (PFCI) measurement campaign. The activity (TMSC-CODVAL) started inAugust 2007 and final results will be discussed within May 2008.[4.2] P. Bauer et al., Report on PITSAM III & IV assemblyat ENEA Frascati, EFDA CSU Garching (April 2007)[4.3] P. Bauer et al., Report on FL1&2 Test at NHMFL June2007, EFDA CSU Garching (August 2007)During 2007 the relevance of some conductor testscarried out in the past at SULTAN were discussed atlength. To clarify earlier measurement procedures and79
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PROGRESS REPORT2007Nuclear Fusion a
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ContentsPART I - FUSION PROGRAMME 7
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2007PART IV - MISCELLANEOUS 18314.
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2007analyses of the missions to be
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Fusion Programme2007 Progress Repor
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Fusion ProgrammeTable 1.I - Summary
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Fusion ProgrammeFollowing a Europea
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Fusion Programmen e (10 20 m -3 )3.
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Fusion Programme2007 Progress Repor
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Fusion Programmewas not affected by
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Fusion ProgrammeShear Alfvén wavec
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Fusion Programmen H (10 20 /m 3 )0.
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Fusion Programmei.e., typically, ra
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Fusion ProgrammeENEA has provided t
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Fission Technologythrough calculati
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Fission Technology1.23 e+001.17 e+0
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Fission TechnologyPressure (bar)642
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Fission TechnologyFig. 8.37 - Creep
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Fission TechnologyENEA organised th
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Fission TechnologyTemperature600400
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Fission TechnologyZ(m)1.00.80.60.40
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Fission Technologythat a system is
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Fission TechnologyMaxwellian-averag
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Fission TechnologyBOT3P has large w
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Fission Technology9.1 Boron Neutron
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Fission TechnologyIn collaboration
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Fission Technologyvolume. Thus the
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Fission TechnologyFig. 9.9 - Logger
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Fission TechnologyIn relation to EN
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Fission TechnologyArticles11.1 Publ
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Fission TechnologyArticles incourse
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Fission TechnologyF. ROELOFS, B. DE
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Fission TechnologyE. BERTHOUMIEUX e
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Fission TechnologyInternal reportsR
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Fission TechnologyRTI FPN-P815-008
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PART IIINUCLEAR PROTECTION171
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12. Radioactive Waste Management an
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13. Publications - Nuclear Protecti
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Miscellaneous14.1 Advances in the I
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Miscellaneoususing a full wave code
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MiscellaneousAt present the effect
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MiscellaneousSuperAGILE view of the
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Abbreviations and AcronymsAacACPADS
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Abbreviations and AcronymsEFITEHRSE
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Abbreviations and AcronymsITERITGIT
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Abbreviations and AcronymsPFWPGAPHY
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Abbreviations and AcronymsVVDEVELLA
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