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Engineering considerations of the duoPIGatron ion source

Description: From fifth symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). In developing an injector system at ORNL with capabilities necessary for high-power injection into ORMAK, several engineering problems must be solved. Emphasis is given to the design and fabrication of the system to achieve electrical stability, power dissipation, beam optics, beam quality, high efficiency and reliability. (auth)
Date: January 1, 1973
Creator: Davis, R.C.; Jernigan, T.C.; Morgan, O.B.; Stewart, L.D. & Stirling, W.L.
Partner: UNT Libraries Government Documents Department

Design of high power injection heaters for the ORMAK system

Description: From fifth symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). The development of neutral injectors at ORNL has stressed input power levels sufficient to heat plasma ions. It has also stressed other problems equally important for success in neutral-injection heating. Injection pulse lengths, which have been extended to 200 msec, will need to be extended further for tokamaks of the future. This requires the ORNL approach of energyefficiency, cooled ion sources, and dc supplies. Low bcam impurity content requires high duty--cycle cleanup, which again means energy efficiency, cooled sources, and dc supplies. Design of the injectors to have gas efficiency and to have sufficient auxiliary pumping is necessary to keep cold gas streaming down to levels not expected to perturb the tokamak plasma. (auth)
Date: January 1, 1973
Creator: Stewart, L.D.; Davis, R.C.; Ezell, J.C.; Jernigan, T.C.; Morgan, O.B.; Stirling, W.L. et al.
Partner: UNT Libraries Government Documents Department

Effect of component performance perturbations on neutral beam injection system performance in thermonuclear reactors

Description: The effect of component performance perturbations on the efficiency of injection of neutral beams into thermonuclear reactors is discussed for a apecific type of a neutral-beam injector. Based on the model chosen, which includes using direct conversion of the unneutralized portions of the ion beam and recovery of the losses from each element of the injector system, quantitative effects of component performance perturbations are presented as a function of the injected-deuterium-atom energy, using positive and negative deuterium ions. The component performances having the largest leverage on the system efficiency are, in decreasing order, the accelerator efficiency, the trapping fraction, the neutralizer loss direct conversion, and the neutralizer power efficiency. (27 figures) (auth)
Date: October 1, 1973
Creator: Hovingh, J.
Partner: UNT Libraries Government Documents Department

Solving problems of neutral beam injectors at LLL

Description: Both mirror machines at LLL, Baseball II and 2XII, require neutral-beam injection of hydrogen or deuteriurm into the plasma. The neutral-beam injector components and their function in the injector system are outlined. Some of the problems with the ion sources, neutralizers, magnetic shielding, beam burial, and vacuum pumping are discussed. (auth)
Date: August 20, 1973
Creator: Chargin, A.K. & Anderson, C.J.
Partner: UNT Libraries Government Documents Department

200 amp neutral beam source

Description: Recent efforts in controlled fusion experiments have indicated the need for large neutral-beam sources to provide an initial plasma for further plasma buildup, for use as a stoking source to makeup losses, or for plasma heating. Experiments now operating or envisioned for the near future anticipate the need for kilo-amp neutral beams in the 20-keV energy range and higher. These sources will be required to focus into relatively small-volume targets, have good gas efficiency, and use a minimum of excess gas for downstream neutralization. A test facility with sufficient pumping capacity to handle sources of this size is described. The ion source, mockup extraction grid, and the requisite electronic and power equipment for a 200-amp neutral-deuterium beam are discussed. The beam pulse length will be from 2 to 10 msec. (auth)
Date: August 20, 1973
Creator: Duffy, T.J.
Partner: UNT Libraries Government Documents Department

Design assumptions and bases for small D-T-fueled Sperical Tokamak (ST) fusion core

Description: Recent progress in defining the assumptions and clarifying the bases for a small D-T-fueled ST fusion core are presented. The paper covers several issues in the physics of ST plasmas, the technology of neutral beam injection, the engineering design configuration, and the center leg material under intense neutron irradiation. This progress was driven by the exciting data from pioneering ST experiments, a heightened interest in proof-of-principle experiments at the MA level in plasma current, and the initiation of the first conceptual design study of the small ST fusion core. The needs recently identified for a restructured fusion energy sciences program have provided a timely impetus for examining the subject of this paper. Our results, though preliminary in nature, strengthen the case for the potential realism and attractiveness of the ST approach.
Date: December 31, 1996
Creator: Peng, Y.K.M.; Galambos, J.D. & Fogarty, P.J.
Partner: UNT Libraries Government Documents Department

Monte Carlo simulation of neutral beam injection into fusion reactors

Description: Motivations and techniques for the Monte Carlo computer simulation of energetic neutral beam injection for fusion reactors are described. The versatility of this approach allows a significantly more sophisticated treatment of charge transfer collision phenomena and consequent effects on engineering design than available from prior work. Exemplary results for a mirror Fusion Engineering Research Facility (FERF) are discussed. (auth)
Date: September 15, 1975
Creator: Miller, R.L.
Partner: UNT Libraries Government Documents Department

High Power Modulator/regulators for neutral beam sources

Description: PPPL has recently completed two new Modulator/Regulators for neutral injection sources used on the ATC machine and is constructing four new ones for use with sources on the PLT machine. The ATC modulator uses the well proven 4CX35,000C tetrode as the main switch tube, while the PLT modulators will be using the new but significantly higher powered X-2170 tetrodes. Some interesting circuit and manufacturing techniques are discussed. (MOW)
Date: January 1, 1975
Creator: Lawson, J.Q. & Deitz, A.
Partner: UNT Libraries Government Documents Department

Effect of component performance perturbations on the efficiency of injection of neutral beams into thermonuclear reactors

Description: From 5th symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). The effect of component performance perturbations on the efficiency of injection of neutral beams into thermonuclear reactors is discussed for a specific type of a neutral beam injector. Based on the model chosen, which includes using direct conversion of the unneutralized portions of the ion beam and recovery of the losses from each element of the injector system, quantitative effects of component performance perturbations are presented as a function of the injected deuterium atom energy, using positive and negative deuterium ions. The component performances having the largest leverage on the system efficiency are, in decreasing order, the accelerator efficiency, the trapping fraction, the neutralizer loss direct conversion, and the neutralizer power efficiency. (auth)
Date: October 10, 1973
Creator: Hovingh, J.
Partner: UNT Libraries Government Documents Department

Power supply for the LBL 40 keV neutral beam source

Description: A 20 keV, 50 Amp, 10 millisec pulse D$sup 0$ Neutral Beam Source at the Lawrence Berkeley Laboratory that serves as the prototype for 12 similar sources now in operation on the 2XIIB Mirror Machine at the Lawrence Livermore Laboratory has been recently upgraded to operate at 40 keV. The system of electronically regulated and controlled power supplies that drive the Source is described. (auth)
Date: November 1, 1975
Creator: Baker, W.R.; Fitzgerald, M.L. & Honey, V.J.
Partner: UNT Libraries Government Documents Department

Test facility for the development of 150-keV, multi-megawatt neutral beam systems

Description: The next generation of CTR experiments, such as the Tokamak Fusion Test Reactor (TFTR), will require neutral-beam injection systems that produce multi- megawatt, 120-keV deuterium-beam pulses of 0.5-second duration. Since present injection systems are operating in the 10- to 40-keV range, an intensive development effort is in progress to meet a 150-keV requirement. The vacuum system and power supplies that make up a test facility to be used in the development of these injectors are described. (MOW)
Date: November 1, 1975
Creator: Haughian, W.; Baker, W.R.; Biagi, L.A. & Hopkins, D.B.
Partner: UNT Libraries Government Documents Department

Mechanical engineering problems in the TFTR neutral beam system

Description: A conceptual design of a prototype beam line for the TFTR Neutral Beam System has been developed. The basic components have been defined, cost estimates prepared, and the necessary development programs identified. Four major mechanical engineering problems, potential solutions and the required development programs are discussed. (auth)
Date: January 1, 1975
Creator: Cannon, D.D.; Bryant, E.H.; Johnson, R.L.; Kim, J.; Queen, C.C. & Schilling, G.
Partner: UNT Libraries Government Documents Department

Conceptual design of a neutral-beam injection system for the TFTR

Description: The neutral-beam injection requirements for heating and fueling the next generation of fusion reactor experiments far exceed those of present devices; the neutral-beam systems needed to meet these requirements will be large and complex. A conceptual design of a TFTR tokamak injection system to produce 120 keV deuterium-ion beams with a total power of about 80 MW is given. (auth)
Date: November 1, 1975
Creator: Ehlers, K.W.; Berkner, K.H.; Cooper, W.S.; Hooper, E.B.; Pyle, R.V. & Stearns, J.W.
Partner: UNT Libraries Government Documents Department

PLT neutral injection ignitron accelerating supply

Description: A phase-controlled rectifier was designed for the accelerating supply on the PLT Neutral Beam Injection system at PPPL. The rectifier must furnish 70 amperes at up to 50 KV for 300 milliseconds, with a duty cycle of up to 10 percent. Protection of the injectors requires the supply to withstand repeated crowbarring. The rectifying element selected to satisfy these requirements was a commercially-available ignitron, installed in a supporting frame and using firing circuits and controls designed by PPPL. (auth)
Date: November 1, 1975
Creator: Ashcroft, D.L.; Murray, J.G.; Newman, R.A. & Peterson, F.L.
Partner: UNT Libraries Government Documents Department

Neutral beam injection in 2XIIB

Description: Integrated into the operation of the 2XIIB controlled fusion experiment is a 600-A, 20-keV neutral injection system: the highest neutral-beam current capacity of any existing fusion machine. This paper outlines the requirements of the injection system and the design features to which they led. Both mechanical and electrical aspects are discussed. Also included is a brief description of some operational aspects of the system and some of the things we have learned along the way, as well as a short history of the most significant developments. (auth)
Date: November 1, 1975
Creator: Hibbs, S.M.
Partner: UNT Libraries Government Documents Department