L. Gargiulo, P. Bayetti, V. Bruno, J. Cordier, J. Hatchressian, C. Hernandez, M. Houry, D. Keller, J. Martins, Y. Measson, Y. Perrot
{"title":"In-situ diagnostics handled by the AIA multipurpose carrier","authors":"L. Gargiulo, P. Bayetti, V. Bruno, J. Cordier, J. Hatchressian, C. Hernandez, M. Houry, D. Keller, J. Martins, Y. Measson, Y. Perrot","doi":"10.1109/FUSION.2009.5226461","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226461","url":null,"abstract":"With possible ITER applications, a 8m long multipurpose carrier has been developed by CEA institutes to operate in the plasma vessel without breaking its conditioning.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122979324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sawan, P. Wilson, T. Tautges, L. El-Guebaly, D. Henderson, T. Bohm, E. Marriott, B. Kiedrowski, B. Smith, A. Ibrahim, R. Slaybaugh
{"title":"Application of CAD-neutronics coupling to geometrically complex fusion systems","authors":"M. Sawan, P. Wilson, T. Tautges, L. El-Guebaly, D. Henderson, T. Bohm, E. Marriott, B. Kiedrowski, B. Smith, A. Ibrahim, R. Slaybaugh","doi":"10.1109/FUSION.2009.5226505","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226505","url":null,"abstract":"An innovative computational tool (DAG-MCNP) has been developed for efficient and accurate 3-D nuclear analysis of geometrically complex fusion systems. Direct coupling with CAD models allows preserving the geometrical details, eliminating possible human error, and faster design iterations. DAG-MCNP has been applied to perform 3-D nuclear analysis for several fusion designs and demonstrated the ability to generate high-fidelity high-resolution results that significantly improve the design process. This tool will be the core for a full CAD-based simulation predictive capability that couples engineering analyses directly to the CAD solid model.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128782541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Frattolillo, F. Bombarda, S. Migliori, M. Capobianchi, G. Ronci, L. Baylor, S. Combs, C. Foust, S. Meitner, D. Fehling, B. Coppi, G. Roveta
{"title":"Development of the high speed pellet injector for ignitor","authors":"A. Frattolillo, F. Bombarda, S. Migliori, M. Capobianchi, G. Ronci, L. Baylor, S. Combs, C. Foust, S. Meitner, D. Fehling, B. Coppi, G. Roveta","doi":"10.1109/FUSION.2009.5226406","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226406","url":null,"abstract":"ENEA and Oak Ridge National Laboratory (ORNL) are collaborating on the development of a four barrel, two-stage pneumatic injector for the Ignitor experiment, featuring two innovative concepts: (i) the proper shaping of the propellant pressure pulse to improve pellet acceleration, and (ii) the use of fast closing (≪ 10 ms) valves to drastically reduce the expansion volumes of the propellant gas removal system. Two independent sub-systems have been built and tested separately by ENEA and ORNL. The ENEA equipment has then been shipped to Oak Ridge, where testing of the two coupled systems have started during the last year. The results of the first two short experimental campaigns, jointly carried out by ENEA and ORNL teams (May 12–16 and December 15–19 2008), as well as the latest advancement of this project will be reported.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116265437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Sharafat, A. Aoyama, N. Morley, N. Ghoniem, B. Williams, James Seline
{"title":"Development of closed-cell syntactic SiC-foam for Flow Channel Inserts","authors":"S. Sharafat, A. Aoyama, N. Morley, N. Ghoniem, B. Williams, James Seline","doi":"10.1109/FUSION.2009.5226456","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226456","url":null,"abstract":"Syntactic closed-cell SiC-foam is being developed as a potential material for Flow Channel Inserts (FCIs). Syntactic foams consist of hollow spheres embedded in a matrix material. Manufacturing of syntactic polymer-base foams is a well-established technology; however, fabrication of syntactic ceramic foams has not been widely demonstrated. For FCI applications the syntactic SiC-foam should consist of near-stochiometric SiC with a well controlled closed-cell size distribution. Here, we report on the development status of the syntactic foam for FCI applications.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122018616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effects of the grid breakdowns on the acceleration Grid Power supply of the ITER NBI","authors":"A. Ferro, L. Zanotto, V. Toigo","doi":"10.1109/FUSION.2009.5226427","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226427","url":null,"abstract":"The acceleration grids of the ITER Neutral Beam Injector (NBI) are likely to be subjected to frequent breakdowns. As a consequence, large voltage oscillations arise on the power supply terminals, which could stress the system and may propagate to the power supply. This paper deals with the analyses carried out to assess the impact of such voltage oscillations on the Acceleration Grid Power Supply (AGPS) of the NBI. A detailed high-frequency model of the power supply is setup and simulations are run, with the aim of estimating the voltage and current stresses at the primary side of the AGPS. The results are analyzed and discussed, giving inputs for the design and testing of the equipments.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"12 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123518946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Yip, P. Mauzey, P. Anderson, T. Le, T. Hegstad, A. Thomas, D. Leung
{"title":"DIII-D water-cooling system upgrades through modeling and power saving projects","authors":"H. Yip, P. Mauzey, P. Anderson, T. Le, T. Hegstad, A. Thomas, D. Leung","doi":"10.1109/FUSION.2009.5226381","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226381","url":null,"abstract":"The DIII-D water-cooling system for the fusion facility at General Atomics consists of the vessel and coil cooling water systems (DIII-D water), components cooling water systems (power supplies, ion-sources, diagnostics and gyrotrons), and heat rejection system (cooling tower and heat exchanger) for the operation of the fusion facility. Since 2005 the water-cooling systems have undergone major upgrades, resulting in average power savings of over 50%. The water-cooling system is now capable of handling future heat loads for long pulse duration (10 s) while operating at lower cost.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115041259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Chrzanowski, T. Meighan, P. Fogarty, L. Dudek, J. F. Paul
{"title":"Lessons learned during the manufacture of the NCSX modular coils","authors":"J. Chrzanowski, T. Meighan, P. Fogarty, L. Dudek, J. F. Paul","doi":"10.1109/FUSION.2009.5226453","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226453","url":null,"abstract":"The National Compact Stellarator Experiment's (NCSX) modular coils presented a number of engineering and manufacturing challenges due to their complex shapes, requirements for high dimensional accuracy and high current density requirements due to space constraints. Being the first of their kind, these coils required the implementation of many new manufacturing and measuring techniques and procedures. This was the first time that these manufacturing techniques and methods were applied in the production of coils at the laboratory. This resulted in a steep learning curve for the first several coils. Through the effective use of procedures, tooling modifications, involvement and ownership by the manufacturing workforce, and an emphasis on safety, the assembly team was able to reduce the manufacturing times and improve upon the manufacturing methods. This paper will discuss the learning curve and steps that were taken to improve the manufacturing efficiency and reduce the manufacturing times for the modular coils without forfeiting quality.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"75 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134101630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Dudek, J. Chrzanowski, G. Gettelfinger, P. Heitzenroeder, S. Jurczynski, M. Viola, K. Freudenberg
{"title":"Testing of compact bolted fasteners with insulation and friction-enhanced shims for NCSX","authors":"L. Dudek, J. Chrzanowski, G. Gettelfinger, P. Heitzenroeder, S. Jurczynski, M. Viola, K. Freudenberg","doi":"10.1109/FUSION.2009.5226444","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226444","url":null,"abstract":"The fastening of the National Compact Stellarator Experiment's (NCSX) modular coils presented a number of engineering and manufacturing challenges due to the high magnetic forces, need to control induced currents, tight tolerances and restrictive space envelope. A fastening method using high strength studs, jack nuts, insulating spacers, bushings and alumina coated shims was developed which met the requirements. A test program was conducted to verify the design. The tests included measurements of flatness of the spacers, determination of contact area, torque vs. tension of the studs and jack nuts, friction coefficient tests on the alumina and G-10 insulators, electrical tests, and tension relaxation tests due to temperature excursions from room temperature to liquid nitrogen temperatures. This paper will describe the design and the results of the test program.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134268607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A novel demountable TF joint design for low aspect ratio spherical torus tokamaks","authors":"R. Woolley","doi":"10.1109/FUSION.2009.5226385","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226385","url":null,"abstract":"A novel shaped design for the radial conductors and demountable electrical joints connecting inner and outer legs of copper TF system conductors in low aspect ratio tokamaks is described and analysis results are presented. Specially shaped designs can optimize profiles of electrical current density, magnetic force, heating, and mechanical stress.","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130771539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Freudenberg, M. Cole, D. Williamson, P. Goranson, B. Nelson, P. Heitzenroeder, R. Myatt
{"title":"Performance evaluation and analysis of critical interface features of the National Compact Stellarator Experiment (NCSX)","authors":"K. Freudenberg, M. Cole, D. Williamson, P. Goranson, B. Nelson, P. Heitzenroeder, R. Myatt","doi":"10.1109/FUSION.2009.5226515","DOIUrl":"https://doi.org/10.1109/FUSION.2009.5226515","url":null,"abstract":"The (18) modular coils for the National Compact Stellarator Experiment (NCSX) are joined at assembly by interfaces to form a toroidal shell which serves as the structural backbone of the device. There are six each of three coil types (A, B, and C); consequently, there are 4 distinct interface designs (A-A, A-B, B-C, C-C). This paper describes the performance evaluations and analyses used in the development of these critical interfaces. Initial analyses indicated that the baseline interface designs did not provide adequate shear capability along the inner (unbolted) legs between the modular coils and did not adequately address assembly tolerance requirements. Consequently a design effort was undertaken to develop interfaces with adequate shear capability and which would facilitate the achievement of assembly tolerances. Analyses indicated that a friction coefficient of 0.3 is necessary for “no-slip” joints with a preload value of ∼320 kN in the outboard regions. Two types of compatible segmented friction shims were developed to meet the friction requirement. One type uses alumina coated stainless steel shims and the other uses G-10/ stainless steel/ G-10 “sandwich shims.” Analyses indicated that the time constant requirements for induced currents in the shell could still be achieved with welds along all the inner (unbolted) legs except at the C-C interface. Consequently, welded interfaces utilizing alternating MIG fillet welds on each end of shims between coil castings were developed to react the shear loads. This configuration minimizes distortion since it avoids direct weld shrinkage stress across the interfaces. Analyses indicates that a 12.7 mm fillet weld has adequate shear capability, with average stress through the welds of 90–125 MPa, compared to a static limit of 217 MPa. Custom sized compression pucks located in the middle of the welded shims react the compressive loads and have average stresses less than 137 MPa. Fatigue acceptability of the welded joints was examined using crack growth data of welded specimens and estimates the maximum acceptable initial flaw size in 12.7 mm welds to be 3.2 mm. At this size, a crack would propagate to an unacceptably large size in 500,000 (5 X life).","PeriodicalId":236460,"journal":{"name":"2009 23rd IEEE/NPSS Symposium on Fusion Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131262346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}