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Plasma Performance Improvement with Lithium-Coated Plasma-Facing Components in NSTX

Description: Lithium as a plasma-facing material has many attractive features, including a reduction in the recycling of hydrogenic species and the potential for withstanding high heat and neutron fluxes in fusion reactors. Recent NSTX experiments have shown, for the first time, significant and recurring benefits of lithium coatings on plasma-facing components (PFC's) to the performance of divertor plasmas in both L- and H- mode confinement regimes heated by high-power neutral beams. They included decreases… more
Date: September 29, 2008
Creator: Kaita, R., et. al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Lessons Learned in Risk Management on NCSX

Description: The National Compact Stellarator Experiment (NCSX) was designed to test physics principles of an innovative stellarator design developed by the Princeton Plasma Physics Laboratory and Oak Ridge National Laboratory. Construction of some of the major components and sub-assemblies was completed, but the estimated cost and schedule for completing the project grew as the technical requirements and risks became better understood, leading to its cancellation in 2008. The project's risks stemmed from i… more
Date: February 11, 2009
Creator: G.H. Neilson, C.O. Gruber, J.H. Harris, D.J. Rej, R.T. Simmons, and R.L. Strykowsky
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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NCSX Plasma Heating Methods

Description: The National Compact Stellarator Experiment (NCSX) has been designed to accommodate a variety of heating systems, including ohmic heating, neutral beam injection, and radio-frequency (rf). Neutral beams will provide one of the primary heating methods for NCSX. In addition to plasma heating, neutral beams are also expected to provide a means for external control over the level of toroidal plasma rotation velocity and its profile. The experimental plan requires 3 MW of 50-keV balanced neutral bea… more
Date: January 18, 2008
Creator: H.W. Kugel, D. Spong, R. Majeski and M. Zarnstorff
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low Distortion Welded Joints for NCSX

Description: The National Compact Stellarator Experiment (NCSX) required precise positioning of the field coils in order to generate suitable magnetic fields. A set of three modular field coils were assembled to form the Half Field-Period Assemblies (HPA). Final assembly of the HPA required a welded shear plate to join individual coils in the nose region due to the geometric limitations and the strength constraints. Each of the modular coil windings was wound on a stainless steel alloy (Stellalloy) casting.… more
Date: February 19, 2009
Creator: M. Denault, M Viola, W. England
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimizing Extender Code for NCSX Analyses

Description: Extender is a parallel C++ code for calculating the magnetic field in the vacuum region of a stellarator. The code was optimized for speed and augmented with tools to maintain a specialized NetCDF database. Two parallel algorithms were examined. An even-block work-distribution scheme was comparable in performance to a master-slave scheme. Large speedup factors were achieved by representing the plasma surface with a spline rather than Fourier series. The accuracy of this representation and the r… more
Date: January 22, 2008
Creator: M. Richman, S. Ethier, and N. Pomphrey
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Risk Management on the National Compact Stellarator Project (NCSX)

Description: In its simplest form, risk management is a continuous assessment from project start to completion that identifies what can impact your project (i.e., what the risks are)., which of these risks are important, and identification and implementation of strategies to deal with these risks (both threats and opportunities). The National Compact Stellerator Experiment (NCSX) Project was a "first-of-a-kind" fusion experiment that was technically very challenging, primarily resulting from the complex com… more
Date: February 6, 2009
Creator: Risk Management on the National Compact Stellarator Project
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Testing of Compact Bolted Fasteners with Insulation and Friction-Enhanced Shims for NCSX

Description: 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 … more
Date: February 4, 2009
Creator: L. E. Dudek, J.H. Chrzanowski, G. Gettelfinger, P. Heitzenroeder, S. Jurczynski, M. Viola and K. Freudenberg
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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NCSX Toroidal Field Coil Design

Description: The National Compact Stellarator Experiment (NCSX) is an experimental device whose design and construction is underway at the Department of Energy's Princeton Plasma Physics Laboratory (PPPL). The primary coil systems for the NCSX device consist of the twisted plasma-shaping Modular Coils, the Poloidal Field Coils, and the Toroidal Field (TF) Coils. The TF Coils are D-shaped coils wound from hollow copper conductor, and vacuum impregnated with a glass-epoxy resin system. There are 18 identical,… more
Date: October 7, 2005
Creator: Kalish M, Rushinski J, Myatt L, Brooks A, Dahlgren F, Chrzanowski J, Reiersen W, Freudenberg K
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Manufacturing Development of the NCSX Modular Coil Windings

Description: The modular coils on the National Compact Stellarator Experiment (NCSX) present a number of significant engineering challenges due to their complex shapes, requirements for high dimensional accuracy and the high current density required in the modular coils due to space constraints. In order to address these challenges, an R&D program was established to develop the conductor, insulation scheme, manufacturing techniques, and procedures. A prototype winding named Twisted Racetrack Coil (TRC) was … more
Date: September 27, 2005
Creator: Chrzanowski JH, Fogarty PJ, Heitzenroeder PJ, Meighan T, Nelson B, Raftopoulos S, Williamson D
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Production Phase for the National Compact Stellarator Experiment (NCSX) Modular Coil Winding Forms

Description: The production phase for the NCSX modular coil winding forms has been underway for approximately one year as of this date. This is the culmination of R&D efforts performed in 2001-4. The R&D efforts included limited manufacturing studies while NCSX was in its conceptual design phase followed by more detailed manufacturing studies by two teams which included the fabrication of full scale prototypes. This provided the foundation necessary for the production parts to be produced under a fi… more
Date: October 20, 2005
Creator: Heitzenroeder, P.; Brown, T.; Neilson, G.; Malinowski, F.; Sutton, L.; Nelson, B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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NCSX Vacuum Vessel Fabrication

Description: The National Compact Stellarator Experiment (NCSX) is being constructed at the Princeton Plasma Physics Laboratory (PPPL) in conjunction with the Oak Ridge National Laboratory (ORNL). The goal of this experiment is to develop a device which has the steady state properties of a traditional stellarator along with the high performance characteristics of a tokamak. A key element of this device is its highly shaped Inconel 625 vacuum vessel. This paper describes the manufacturing of the vessel. The … more
Date: October 7, 2005
Creator: Viola, M. E.; Brown, T.; Heitzenroeder, P.; Malinowski, F.; Reiersen, W.; Sutton, L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using E-beam Mapping to Detect Coil Misalignment in NCSX

Description: Following assembly of the NCSX device, a program of e-beam mapping experiments is planned to validate the accuracy of the construction and assembly of the NCSX coil systems. To aid in the development of requirements for the e-beam mapping hardware and machine requirements, simulations of the e-beam mapping experiments, including various coil misalignments, have been done. The magnetic flux surface configuration was constructed using a numerical code, based on the Biot-Savart law, to calculate t… more
Date: October 18, 2005
Creator: Fredrickson E, Georgiyevskiy A, Rudakov V, Zarnstorff MC
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Accomplishments in Field Period Assembly for NCSX* This is how we did it

Description: The National Compact Stellarator Experiment (NCSX) was a collaborative effort between ORNL and PPPL. PPPL provided the assembly techniques with guidance from ORNL to meet design criteria. The individual vacuum vessel segments, modular coils, trim coils, and toroidal field coils components were delivered to the Field Period Assembly (FPA) crew who then would complete the component assemblies and then assemble the final three field period assemblies, each consisting of two sets of three modular c… more
Date: September 14, 2009
Creator: Michael Viola, J. Edwards, T. Brown, L. Dudek, R. Ellis, P. Heitzenroeder, R. Strykowsky and Michael Cole
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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