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in subjects: "Mftf Devices"

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THE PERFORMANCE OF THE 8.4 MW MODULATOR/REGULATOR POWE SYSTEMS FOR THE ELECTRON CYCLOTRON HEATING FACILITY UPGRADE AT DIII-D

The DIII-D National Fusion Facility at General Atomics is completing the upgrade of its electron cyclotron heating (ECH) capability from the previous 3 MW at 110 GHz to 6 MW of generated microwave power. An 8.4 MW modulator/regulator (M/R) power system has been designed and constructed. Surplus hardware that was acquired from the Lawrence Livermore National Laboratory (LLNL) Mirror Fusion Test Facility (MFTF program) was used as part of the design foundation. The power system, with a nominal ou… more

Date: November 1, 2000

Creator: Pronko, S. G. E.; Delaware, S. W.; Harris, T. E.; Hoyt, D.; Kellman, D. H.; Legg, R. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development and application of specially-focused ultrasonic transducers to location and sizing of defects in 75 mm- to 127 mm-thick austenitic stainless steel weld metals

Special UT transducer parts, capable of focusing incident signals within a 25 mm {times} 25 mm {times} 25 mm volume in an austenitic stainless weld metal at depths that varied from 25 mm to 127 mm, were developed and demonstrated to be capable of detecting a defect with cross section equivalent to that of a 4.76 mm-dia flat-bottom hole. Defect length sizing could be accomplished to {plus_minus}50% for 100% of the time and to {plus_minus}25% on selected defect types as follows: porosity groups, … more

Date: August 1, 1992

Creator: Dalder, E. N. C.; Benson, S.; McKinley, B. J. & Carodiskey, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Final design report, September 11, 1986

The task is to design the quasi-optical microwave components for each of five different optical paths within the MFTF-B machine. Each path contains two reflectors. The function of the two reflectors in each path is to modify the output field of a waveguide to a desired pattern within the plasma. For all five beam paths, the waveguide output is assumed to be a TE 01 mode as decided at the July 18, design review. Each optical train consists of two reflectors. The first reflector is an off axis pa… more

Date: November 1, 1988

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The use of idle equipment for ITER (International Thermonuclear Engineering Reactor) magnet development

Test facilities that can be effectively applied to International Thermonuclear Engineering Reactor (ITER) magnet needs are scarce because the costs and the time required to produce them from the ground up tend to be prohibitive. It has been proposed as an option that several unique and valuable pieces of equipment that are already owned by the DOE be consolidated into the Lawrence Livermore National High Field Test Facility (HFTF) which may be uniquely qualified to make effective use of them. 6… more

Date: July 11, 1988

Creator: Miller, J. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Operation of the cryogenic system for the Mirror Fusion Test Facility

The cryogenic system for the Mirror Fusion Test Facility (MFTF) at Lawrence Livermore National Laboratory (LLNL) was designed to cool the entire MFTF-B system from ambient to operating temperature in less than 10 days. The system was successfully operated in the recent plant and capital equipment (PACE) acceptance tests, and results from these tests helped us correct problem areas and improve the system.

Date: June 9, 1987

Creator: Chronis, W.C. & Slack, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Mirror Fusion Test Facility cryogenic system: Performance, management approach, and present equipment status

The cryogenic system for the Mirror Fusion Test Facility (MFTF) is a 14-kW, 4.35-K helium refrigeration system that proved to be highly successful and cost-effective. All operating objectives were met, while remaining within a few percent of initial cost and schedule plans. The management approach used in MFTF allowed decisions to be made quickly and effectively, and it helped keep costs down. Manpower levels, extent and type of industrial participation, key aspects of subcontractor specificati… more

Date: June 8, 1987

Creator: Slack, D.S. & Chronis, W.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Alarm points for fixed oxygen monitors

Oxygen concentration monitors were installed in a vault where numerous pipes carried inert cryogens and gases to the Mirror Fusion Test Facility (MFTF-B) experimental vessel at Lawrence Livermore National Laboratory (LLNL). The problems associated with oxygen-monitoring systems and the reasons why such monitors were installed were reviewed. As a result of this review, the MFTF-B monitors were set to sound an evacuation alarm when the oxygen concentration fell below 18%. We chose the 18% alarm c… more

Date: May 1, 1987

Creator: Miller, G.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Engineering study of the neutral beam and rf heating systems for DIII-D, MFTF-B, JET, JT-60 and TFTR

An engineering study was performed on the rf and neutral beam heating systems implemented for DIII-D, MFTF-B, JET, JT-60 and TFTR. Areas covered include: methodology used to implement the systems, technology, cost, schedule, performance, problems encountered and lessons learned. Systems are compared and contrasted in the areas studied. Summary statements were made on common problems and lessons learned. 3 refs., 6 tabs.

Date: January 1, 1987

Creator: Lindquist, W.B. & Staten, S.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The operator interface for the Mirror Fusion Test Facility

The uncertain and most likely changing nature of a large experimental facility like MFTF, as well as its large number of control and monitor points, ruled against the traditional hardware approach involving walls of knobs, dials, oscilloscopes, and strip chart recorders. Rather, from the beginning, project management specified computer control of all systems, and operation of the complete MFTF under an integrated computer control system became a major engineering goal. The Integrated Controls a… more

Date: December 1, 1986

Creator: Lang, N. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Construction and operation of the 12-T superconducting coils for the Mirror Fusion Test Facility

We have successfully constructed and tested a pair of high-field coils that is part of the magnet set of the Mirror Fusion Test Facility (MFTF-B) at the Lawrence Livermore National Laboratory. Each coil consists of a multifilamentary Nb/sub 3/Sn magnet nested inside a multifilamentary NbTi magnet. During our test, these coils produced a central field of 12 T, with a peak conductor field of 12.5 T. The dimensions of the Nb/sub 3/Sn insert coil are: 1.34-m bore, 2.57-m outer diameter, and 1.14-m … more

Date: September 25, 1986

Creator: Zbasnik, J. P.; Kozman, T. A.; Shimer, D. W. & Hathaway, D. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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MFTF-B acceptance tests and operation

Final acceptance tests of the Mirror Fusion Test Facility (MFTF-B) were completed in February 1986. These tests verified performance of the following subsystems: the magnet system, the vacuum system and vessel, cryogenic systems, 80-keV neutral-beam sources and power supplies, microwave power systems for plasma heating, the supervisory control and diagnostic system, and the local control and instrumentation system. The entire magnet system was operated at full field continuously for 24 hours. T… more

Date: September 24, 1986

Creator: Coensgen, F. H.; Gerich, J. W.; Holl, P. M.; Karpenko, V. P.; Kozman, T. A.; Krause, K. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Liquid helium cooling of the MFTF superconducting magnets

During acceptance testing of the Mirror Fusion Test Facility (MFTF), we measured these tests: liquid helium heat loads and flow rates in selected magnets. We used the data from these tests to estimate helium vapor quality in the magnets so that we could determine if adequate conductor cooling conditions had occurred. We compared the measured quality and flow with estimates from a theoretical model developed for the MFTF magnets. The comparison is reasonably good, considering influences that can… more

Date: September 1, 1986

Creator: VanSant, J.H. & Zbasnik, J.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Numerical study of the mode selection in response spectrum analysis-condensed version

For quality assurance of the dynamic response spectrum analysis, the Nuclear Regulatory Commission (NRC) recommends retaining all modes below the cutoff frequency at which the spectral acceleration (S/sub a/) returns to the peak zero period acceleration (ZPA). It also suggests that modes accounting for at least 90 percent of the structural masses be included in the analysis. A simple frame-type structure is generated as a baseline frame. Then groups of oscillators representing substructure are … more

Date: September 1, 1986

Creator: Ng, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Static and dynamic analyses on the MFTF (Mirror Fusion Test Facility)-B Axicell Vacuum Vessel System: Final report

The Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory (LLNL) is a large-scale, tandem-mirror-fusion experiment. MFTF-B comprises many highly interconnected systems, including a magnet array and a vacuum vessel. The vessel, which houses the magnet array, is supported by reinforced concrete piers and steel frames resting on an array of foundations and surrounded by a 7-ft-thick concrete shielding vault. The Pittsburgh-Des Moines (PDM) Corporation, which was awarded th… more

Date: September 1, 1986

Creator: Ng, D.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Construction and testing of the Mirror Fusion Test Facility magnets

This paper describes the construction and testing of the Mirror Fusion Test Facility superconducting magnet set. Construction of the first Yin Yang magnet was started in 1978. And although this particular magnet was later modified, the final construction of these magnets was not completed until 1985. When completed these 42 magnets weighed over 1200 tonnes and had a maximum stored energy of approximately 1200 MJ at full field. Together with power supplies, controls and liquid nitrogen radiation… more

Date: August 1, 1986

Creator: Kozman, T.; Shimer, D.; VanSant, J. & Zbasnik, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High field superconducting magnets (12 T and greater) for fusion applications

The technology for producing high fields in large superconducting magnets has increased greatly in recent years, but must increase still more in the future. In this paper, we examine the present state of the art vis-a-vis the needs of a next-generation fusion machine and outline a program to provide for those needs. We also highlight recent developments that suggest the program goals are within reach.

Date: July 9, 1986

Creator: Miller, J. R.; Summers, L. T. & Kerns, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Options for axisymmetric operation of MFTF-B

The flexibility of MFTF-B for axisymmetric experiments has been investigated. Interhcanging the axicell coils and increasing their separation results in an axisymmetric plug cell with 12:1 and 6:1 inner and outer mirror ratios, respectively. For axisymmetric operation, the sloshing-ion neutral beams, ECRH gyrotrons, and the pumping system would be moved to the axicell. Stabilization by E-rings could be explored in this configuration. With the addition of octopole magnets, off-axis multipole sta… more

Date: March 30, 1986

Creator: Fenstermacher, M. E.; Devoto, R. S. & Thomassen, K. I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Vacuum vessel for the tandem Mirror Fusion Test Facility

In 1980, the US Department of Energy gave the Lawrence Livermore National Laboratory approval to design and build a tandem Mirror Fusion Test Facility (MFTF-B) to support the goals of the National Mirror Program. We designed the MFTF-B vacuum vessel both to maintain the required ultrahigh vacuum environment and to structurally support the 42 superconducting magnets plus auxiliary internal and external equipment. During our design work, we made extensive use of both simple and complex computer m… more

Date: March 10, 1986

Creator: Gerich, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Seismic analysis of the Mirror Fusion Test Facility: soil structure interaction analyses of the Axicell vacuum vessel. Revision 1

This report documents the seismic analyses performed by SMA for the MFTF-B Axicell vacuum vessel. In the course of this study we performed response spectrum analyses, CLASSI fixed-base analyses, and SSI analyses that included interaction effects between the vessel and vault. The response spectrum analysis served to benchmark certain modeling differences between the LLNL and SMA versions of the vessel model. The fixed-base analysis benchmarked the differences between analysis techniques. The SSI… more

Date: March 1, 1986

Creator: Maslenikov, O. R.; Mraz, M. J. & Johnson, J. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Diagnostic control, data acquisition and data processing at MFTF-B (Mirror Fusion Test Facility)

Diagnostic instruments at the Mirror Fusion Test Facility (MFTF-B) are operated by a distributed computer system which provides an integrated control, data acquisition and data processing interface. Instrument control settings, operator inputs and lists of data to be acquired are combined with data acquired by instrument data recorders, to be used downstream by data processing codes; data processing programs are automatically informed of operator control and setpoint actions without operator in… more

Date: January 1, 1986

Creator: Preckshot, G.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Magnetic shielding for the long-pulse, pure-beam source neutralizers on the MFTF-B

Present ion sources produce deuterium ions plus small amounts of impurity ions including oxygen. The oxygen current is readily trapped by the Mirror Fusion Test Facility-B (MFTF-B) plasma and represents a severe energy loss mechanism. A pure-beam source-neutralizer has been designed by LLNL for the MFTF-B. This concept uses momentum separation by closely coupling an electromagnet to the source to purify the beam. This design requires a low pressure in the neutralizer, implying a long length and… more

Date: November 15, 1985

Creator: Kerns, J.; Stone, R.; Fabyan, F. & Martin, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Operation of cold-cathode gauges in high magnetic fields

The Mirror Fusion Test Facility (MFTF-B), under construction at LLNL, requires measurement of the neutral gas density in high magnetic fields near the plasma at several axial regions. This Background Gas Pressure (BGP) diagnostic will help us understand the role of background neutrals in particle and power balance, particularly in the maintenance of the cold halo plasma that shields the hot core plasma from the returning neutrals. It consists of several cold-cathode, magnetron-type gauges strip… more

Date: November 11, 1985

Creator: Thomas, S. R., Jr.; Goerz, D. A. & Pickles, W. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design, construction, and testing of the vacuum vessel for the tandem Mirror Fusion Test Facility

Date: November 1, 1985

Creator: Gerich, J.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thermal and structural analysis of the LBL 10 x 40 cm long pulse accelerator and the 12 x 48 cm common long pulse accelerator for TFTR, doublet III-D, and MFTF-B

Stress and deflection of the grid rails of the existing, Lawrence Berkeley Laboratory (LBL) designed, 10 x 40 cm Long Pulse (neutral beam) Accelerator (40LPA) and the expanded 12 x 48 cm version, Common Long Pulse Source (CLPS), have been computed for a series of assumed heat load distributions. The combined stress from self-constraint of thermal expansion and rail holder reaction forces has been calculated. A simplification of the gradient grid rail holder was analyzed and was found to work as… more

Date: November 1, 1985

Creator: Wells, R.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department