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Tritium related safety considerations for mirror upgrades

Description: One of the primary objectives of the MFTF-B upgrades is to demonstrate the technology of tritium breeding in a reactor-like configuration. This requires use and processing of tritium, involving an inventory of several hundred grams at the plant. This paper reviews the results of a preliminary assessment of the radiation hazard associated with the handling of tritium. The radiation dose consequences due to tritium release from normal operation and due to postulated accidents on plant personnel a… more
Date: November 30, 1983
Creator: Ghose, S.K.
Partner: UNT Libraries Government Documents Department
open access

NOVA laser facility for inertial confinement fusion

Description: The NOVA laser consists of ten beams, capable of concentrating 100 to 150 kJ of energy (in 3 ns) and 100 to 150 TW of power (in 100 ps) on experimental targets by 1985. NOVA will also be capable of frequency converting the fundamental laser wavelength (1.05 ..mu..m) to its second (0.525 ..mu..m) or third (0.35 ..mu..m) harmonic. This additional capability (80 to 120 kJ at 0.525 ..mu..m, 40 to 70 kJ at 0.35 ..mu..m) was approved by the US Department of Energy (DOE) in April 1982. These shorter w… more
Date: November 30, 1983
Creator: Simmons, W.W.
Partner: UNT Libraries Government Documents Department
open access

Mirror Fusion Test Facility: an intermediate device to a mirror fusion reactor

Description: The Mirror Fusion Test Facility (MFTF-B) now under construction at Lawrence Livermore National Laboratory represents more than an order-of-magnitude step from earlier magnetic-mirror experiments toward a future mirror fusion reactor. In fact, when the device begins operating in 1986, the Lawson criteria of ntau = 10/sup 14/ cm/sup -3/.s will almost be achieved for D-T equivalent operation, thus signifying scientific breakeven. Major steps have been taken to develop MFTF-B technologies for tande… more
Date: March 30, 1983
Creator: Karpenko, V.N.
Partner: UNT Libraries Government Documents Department
open access

Design of a separator/neutralizer to limit impurities and non-primary species in the Mirror Fusion Test Facility

Description: The optimum plasma for the tandem Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory (LLNL) is very sensitive to heavy contaminates, such as oxygen and metals. Unfortunately the current neutral beam sources generate not only high energy deuterium particles but also high energy oxygen particles. A new MFTF-B separator/neutralizer has been designed to filter out the unwanted oxygen and allow only primary species neutrals to reach the plasma.
Date: November 30, 1983
Creator: Goldner, A.I.
Partner: UNT Libraries Government Documents Department
open access

Configuration and layout of the tandem mirror Fusion Power Demonstrator

Description: Studies have been performed during the past year to determine the configuration of a tandem mirror Fusion Power Demonstrator (FPD) machine capable of producing 1750 MW of fusion power. The FPD is seen as the next logical step after the Mirror Fusion Test Facility-B (MFTF-B) toward operation of a power reactor. The design of the FPD machine allows a phased construction: Phase I, a hydrogen or deuterium checkout machine; Phase 2, a DT breakeven machine; Phase 3, development of the Phase 2 machine… more
Date: November 30, 1983
Creator: Clarkson, I.R. & Neef, W.S.
Partner: UNT Libraries Government Documents Department
open access

Assurance management program for the 30 Nova laser fusion project

Description: The Nova assurance management program was developed using the quality assurance (QA) approach first implemented at LLNL in early 1978. The LLNL QA program is described as an introduction to the Nova assurance management program. The Nova system is described pictorially through the Nova configuration, subsystems and major components, interjecting the QA techniques which are being pragmatically used to assure the successful completion of the project.
Date: November 30, 1983
Creator: Levy, A.J.
Partner: UNT Libraries Government Documents Department
open access

Theory of optical flashes

Description: The theory of optical flashes created by x- and ..gamma..-ray burst heating of stars in binaries is reviewed. Calculations of spectra due to steady-state x-ray reprocessing and estimates of the fundamental time scales for the non-steady case are discussed. The results are applied to the extant optical data from x-ray and ..gamma..-ray bursters. Finally, I review predictions of flashes from ..gamma..-ray bursters detectable by a state of the art all-sky optical monitor.
Date: September 30, 1983
Creator: London, R. A.
Partner: UNT Libraries Government Documents Department
open access

Commercial bacterial colony counter for semiautomatic track counting

Description: Bacterial colony counters have not been widely used for track counting. However, they do provide an economical alternative to sophisticated optical analyzers for applications that require reproducible track density measurements for large numbers of samples. Simple measurements of size characteristics can be made when there is little need for high resolutions. Such systems are particularly well suited for neutron and alpha dosimetry work, particularly if electrochemical etching or some other tra… more
Date: August 30, 1983
Creator: Griffith, R.V.; McMahon, T.A. & Espinosa, G.
Partner: UNT Libraries Government Documents Department
open access

Analytical studies of advanced high-field designs: 20-tesla large-bore superconducting magnets

Description: Several emerging technologies have been combined in a conceptual design study demonstrating the feasibility of producing ultrahigh magnetic fields from large-bore superconducting solenoid magnets. Several designs have been produced that approach peak fields of 20-T in 2.0-m diameter inner bores. The analytical expressions comprising the main features of CONDUCTOR and ADVMAGNET, the two computer programs used in the design of these advanced magnets, are also discussed. These magnets and design t… more
Date: September 30, 1983
Creator: Hoard, R. W.; Cornish, D. N.; Scanlan, R. M.; Zbasnik, J. P.; Leber, R. L.; Hickman, R. B. et al.
Partner: UNT Libraries Government Documents Department
open access

X-ray microscopy using grazing-incidence reflections optics

Description: The role of Kirkpatrick-Baez microscopes as the workhorse of the x-ray imaging devices is discussed. This role is being extended with the development of a 22X magnification Kirkpatrick-Baez x-ray microscope with multilayer x-ray mirrors. These mirrors can operate at large angles, high x-ray energies, and have a narrow, well defined x-ray energy bandpass. This will make them useful for numerous experiments. However, where a large solid angle is needed, the Woelter microscope will still be necess… more
Date: June 30, 1983
Creator: Price, R.H.
Partner: UNT Libraries Government Documents Department
open access

Status of tandem-mirror confinement

Description: Recent end-stopping experiments in TMX-Upgrade show strong plugging of the central cell by lower-density plugs, requiring both electron-cyclotron heating (ECRH) and 47/sup 0/ neutral-beam injection, consistent with the thermal-barrier concept. These experiments have low density (n < 10/sup 12/ cm/sup -3/) due to inefficient ECRH power coupling. Hot-ion and hot-electron buildup are consistent with Fokker-Planck calculations. No ion-cyclotron activity is observed in the plugs; occasional electron… more
Date: August 30, 1983
Creator: Baldwin, D.E.
Partner: UNT Libraries Government Documents Department
open access

Development of procedures to ensure quality and integrity in Tandem Mirror Experiment-Upgrade (TMX-U) diagnostics systems

Description: The diagnostic systems for Tandem Mirror Experiment-Upgrade (TMX-U) have grown from eleven initial systems to more than twenty systems. During operation, diagnostic system modifications are sometimes required to complete experimental objectives. Also, during operations new diagnostic systems are being developed and implemented. To ensure and maintain the quality and integrity of the data signals, a set of plans and systematic actions are being developed. This paper reviews the procedures set in… more
Date: November 30, 1983
Creator: Coutts, G. W.; Coon, M. L.; Hinz, A. F.; Hornady, R. S.; Lang, D. D. & Lund, N. P.
Partner: UNT Libraries Government Documents Department
open access

Performance of the MFTF magnet cryogenic power leads

Description: The cryogenic power lead system for the MFTF superconducting magnets has been acceptance tested and operated with the magnets. This system, which includes 5-m-long superconducting buses, 1.5-m-long vapor-cooled transition leads, external warm buses, and a cryostack, can conduct up to 6000 A (dc) and operate adiabatically for long periods. We present both design details and performance data; our MFTF version is an example of a reliable lead system for large superconducting magnets contained in a… more
Date: November 30, 1983
Creator: VanSant, J.H.
Partner: UNT Libraries Government Documents Department
open access

Noise filtering algorithm for the MFTF-B computer based control system

Description: An algorithm to reduce the message traffic in the MFTF-B computer based control system is described. The algorithm filters analog inputs to the control system. Its purpose is to distinguish between changes in the inputs due to noise and changes due to significant variations in the quantity being monitored. Noise is rejected while significant changes are reported to the control system data base, thus keeping the data base updated with a minimum number of messages. The algorithm is memory efficie… more
Date: November 30, 1983
Creator: Minor, E.G.
Partner: UNT Libraries Government Documents Department
open access

Evaluating and tuning system response in the MFTF-B control and diagnostics computers

Description: The software system running on the Supervisory Control and Diagnostics System (SCDS) of MFTF-B is, for the major part, an event driven one. Regular, periodic polling of sensors' outputs takes place only at the local level, in the sensors' corresponding local control microcomputers (LCC's). An LCC reports a sensor's value to the supervisory computer only if there was a significant change. This report is passed as a message, routed among and acted upon by a network of applications and systems tas… more
Date: November 30, 1983
Creator: Palasek, R.L.; Butner, D.N. & Minor, E.G.
Partner: UNT Libraries Government Documents Department
open access

Sparking protection for MFTF-B neutral beam power supplies

Description: This paper describes the upgrade of MFTF-B Neutral Beam Power Supplies for sparking protection. High performance ion sources spark repeatedly so ion source power supplies must be insensitive to sparking. The hot deck houses the series tetrode, arc and filament supplies, and controls. Hot deck shielding has been upgraded and a continuous shield around the arc, filament, gradient grid, and control cables now extends from the hot deck, through the core snubber, to the source. The shield carries ac… more
Date: November 30, 1983
Creator: Cummings, D. B.
Partner: UNT Libraries Government Documents Department
open access

Strategies of design, development and activation of the Nova control system

Description: Nova and Novette are large complex experimental laser facilities which require extensive and sophisticated control systems for their successful operation. Often, in major controls projects, certain invisible aspects of the project, such as overall strategy, management, resources and historical constraints, have a more profound effect upon success than any specific hardware/software design. The design and performance of the Nova/Novette laser control system will be presented with special emphasi… more
Date: June 30, 1983
Creator: Holloway, F.W.
Partner: UNT Libraries Government Documents Department
open access

Startup experience with the MFTF-B ECRH 100 kV dc power supply

Description: One of the 24 Accel dc Power Supplies (ADCPS) originally intended for the Mirror Fusion Test Facility (MFTF-B) Neutral Beam Power Supply (NBPS) System has been converted to provide negative polarity output at 90 kV with a load current of 64 A dc. The load duty cycle is a pulse of 30-seconds duration with a pulse repetition period of five minutes. A new control system has been built which will serve as a prototype for the MFTF-B ADCPS controls, and a test setup was built which will be used to te… more
Date: November 30, 1983
Creator: Bishop, S. R.; Goodman, R. A. & Wilson, J. H.
Partner: UNT Libraries Government Documents Department
open access

Computer model of the MFTF-B neutral beam Accel dc power supply

Description: Using the SCEPTRE circuit modeling code, a computer model was developed for the MFTF Neutral Beam Power Supply System (NBPSS) Accel dc Power Supply (ADCPS). The ADCPS provides 90 kV, 88 A, to the Accel Modulator. Because of the complex behavior of the power supply, use of the computer model is necessary to adequately understand the power supply's behavior over a wide range of load conditions and faults. The model developed includes all the circuit components and parameters, and some of the stra… more
Date: November 30, 1983
Creator: Wilson, J. H.
Partner: UNT Libraries Government Documents Department
open access

Alternative power supply and dump resistor connections for similar, mutally coupled, superconducting coils

Description: Alternative methods of connecting similar mutually coupled coils to their power supplies and dump resistors are investigated. The circuits are evaluated for both operating and fault conditions. The factors considered are the voltage to ground during a dump, short circuits, open circuits, quenches, and failure of the protection system to detect a quench. Of particular interest are the currents induced in coils that remain superconducting when one or more coils quench. The alternative connections… more
Date: November 30, 1983
Creator: Owen, E. W.; Shimer, D. W. & Wang, S. T.
Partner: UNT Libraries Government Documents Department
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