Search Results

Advanced search parameters have been applied.
open access

MFTF-B quasi-optical ECRH transmission system

Description: The microwave transmission system for ERCH on MFTF-B will utilize quasi-optical transmission techniques. The system consists of ten gyrotron oscillators: two gyrotrons at 28 GHz, two at 35 GHz, and six at 56 GHz. The 28 and 35 GHz gyrotrons both heat the electrons in the end plug (potential peak) while the 56 GHz sources heat the minimum-B anchor region (potential minimum). Microwaves are launched into a pair of cylindrical mirrors that form a pseudo-cavity which directs the microwaves through … more
Date: November 7, 1983
Creator: Yugo, J. J.; Shearer, J. W. & Ziolkowski, R. W.
Partner: UNT Libraries Government Documents Department
open access

MFTF-B electron-cyclotron-resonance heating system

Description: The MFTF-B ECRH system will provide 1.6-MW of microwave power for heating of electrons within the thermal barrier and potential maximum regions of the plasma end-plugs. Absorption of this radiation increases the resonant electron energy which locally alters the electrostatic confining potential within the plasma. The result is a thermal barrier which will isolate end-plug electrons from those in the solenoid thus increasing the plasma confinement time. Microwave energy will be generated by eigh… more
Date: October 22, 1981
Creator: Krause, K. H.; Pollock, G. G. & Yugo, J. J.
Partner: UNT Libraries Government Documents Department
open access

Mechanical design of the folded waveguide for PBX-M and TFTR

Description: The folded waveguide (FWG) antenna is an advanced Cyclotron Range of Frequencies launcher being designed at Oak Ridge National Laboratory in collaboration with Princeton Plasma Physics Laboratory. The FWG offers a drastic increase in radio frequency (RF) power density over typical loop antennas. It also results in internal electric fields of much lower magnitude near the plasma. It is scheduled for installation on either the Tokamak Fusion Test Reactor (TFTR) or the Princeton Beta Experiment-Mo… more
Date: December 31, 1995
Creator: Fogelman, C. H.; Bigelow, T. S. & Yugo, J. J.
Partner: UNT Libraries Government Documents Department
open access

Design of an ion cyclotron resonance heating system for the Compact Ignition Tokamak

Description: The Compact Ignition Tokamak (CIT) requires 10-20 MW of ion cyclotron resonance heating (ICRH) power to raise the plasma temperature to ignition. The initial ICRH system will provide 10 MW of power to the plasma, utilizing a total of six rf power units feeding six current straps in three ports. The systems may be expanded to 20 MW with additional rf power units, antennas, and ports. Plasma heating will be achieved through coupling to the fundamental ion cyclotron resonance of a /sup 3/He minori… more
Date: January 1, 1987
Creator: Yugo, J. J.; Goranson, P. L.; Swain, D. W.; Baity, F. W. & Vesey, R.
Partner: UNT Libraries Government Documents Department
open access

Quasi-optical ECRH beam system for MFTF-B

Description: Multiple frequency electron cyclotron resonance heating (ECRH) is required in the anchor regions of MFTF-B. The requirement for a high transmission efficiency as well as some aspects of the operating environment make a quasi-optical transmission system attractive (neutron activation and damage of materials, x-rays, rf window coolant leaks, cryogenic temperatures, etc.). A quasi-optical transmission system increases the transmission efficiency and reduces the complexity of the hardware in the va… more
Date: January 1, 1983
Creator: Yugo, J. J.; Shearer, J. W.; Ziolkowski, R. W.; Krause, K. H.; Berkey, J. H. & Fong, C. G.
Partner: UNT Libraries Government Documents Department
open access

Electromagnetic loads on ITER in-vessel components

Description: Design of the vacuum vessel and internal blanket/shield modules for the International Thermonuclear Experimental Reactor (ITER) is strongly influenced by the magnitude of electromagnetic loads due to plasma disruption. Calculations with the finite element code, EddyCuFF, have been performed to quantify these loads and incorporate them into the design process. A multifilament model of plasma motion and current decay has been developed using data generated by the Tokamak Simulation Code (TSC). Co… more
Date: January 1, 1991
Creator: Williamson, D. E.; Conner, D. L.; Nelson, B. E.; Sayer, R. O. & Yugo, J. J.
Partner: UNT Libraries Government Documents Department
open access

Design of the ICRH antenna for TPX

Description: A 6-MW ion cyclotron (IC) system for the Tokamak Physics Experiment (TPX) is in the preliminary design phase. In conjunction with the 3-MW Lower Hybrid system and the 8-MW neutral beam system, the IC system will provide heating and current-drive capabilities to explore advanced tokamak physics and long-pulse (1000 s) operation. The IC launcher consists of six nickel-plated current straps arranged toroidally in pairs behind three water-cooled Faraday shields. The Faraday shields can be independe… more
Date: January 1, 1996
Creator: Fogelman, C. H.; Goranson, P. L.; Swain, D. W.; Ryan, P. M. & Yugo, J. J.
Partner: UNT Libraries Government Documents Department
open access

Lower hybrid system design for the Tokamak physics experiment

Description: The lower hybrid (LH) launcher configuration has been redesigned to integrate the functions of the vertical four-way power splitter and the front waveguide array (front array). This permits 256 waveguide channels to be fed by only 64 waveguides at the vacuum window interface. The resulting configuration is a more compact coupler, which incorporates the simplicity of a multijunction coupler while preserving the spectral flexibility of a conventional lower hybrid launcher. Other spin-offs of the … more
Date: December 31, 1995
Creator: Goranson, P. L.; Conner, D. L.; Swain, D. W.; Yugo, J. J.; Bernabei, S. & Greenough, N.
Partner: UNT Libraries Government Documents Department
open access

ICRF antenna designs for CIT and Alcator C-Mod

Description: An ion cyclotron range of frequencies (ICRF) launcher for the Compact Ignition Tokamak (CIT) has been designed. This launcher incorporates four current straps in a 2 /times/ 2 configuration. The current straps consist of end-fed loops that are grounded in the middle. An antenna similar in geometry, size, and feed configuration to a single strap of the CIT launcher will be built for use on Alcator C-Mod. The design must provide maximum power levels of 4 MW/port for CIT and 2 MW/port for C-Mod, p… more
Date: January 1, 1989
Creator: Goulding, R. H.; Baity, F. W.; Goranson, P. L.; Hoffman, D. J.; Ryan, P. M.; Traylor, D. J. et al.
Partner: UNT Libraries Government Documents Department
open access

Computational Benchmark Calculations Relevant to the Neutronic Design of the Spallation Neutron Source (SNS)

Description: The Spallation Neutron Source (SNS) will provide an intense source of low-energy neutrons for experimental use. The low-energy neutrons are produced by the interaction of a high-energy (1.0 GeV) proton beam on a mercury (Hg) target and slowed down in liquid hydrogen or light water moderators. Computer codes and computational techniques are being benchmarked against relevant experimental data to validate and verify the tools being used to predict the performance of the SNS. The LAHET Code System… more
Date: November 14, 1999
Creator: Gallmeier, F. X.; Glasgow, D. C.; Jerde, E. A.; Johnson, J. O. & Yugo, J. J.
Partner: UNT Libraries Government Documents Department
open access

The ion cyclotron heating (ICH) system for BPX

Description: The ICH system is required to deliver at least 20 MW of rf power to the BPX plasma for pulse lengths of up to 15 s over a range of plasma operating conditions (e.g., average plasma densities from 0.5 to 4.5 {times} 10{sup 20} m{sup {minus}3}, toroidal fields from 5 to 8 T). The power must be delivered to the plasma over a range of frequencies corresponding to the different operating conditions. On the basis of calculations of the load resistance that the antennas will see because of the presenc… more
Date: January 1, 1991
Creator: Swain, D. W.; Yugo, J. J.; Williamson, D. E.; Batchelor, D. B.; Carter, M. D. & Goulding, R. H.
Partner: UNT Libraries Government Documents Department
open access

Design of folded waveguide antenna for Alcator C-Mod

Description: The Oak Ridge National Laboratory (ORNL) ion cyclotron range of frequencies (ICRF) antenna for Alcator C-Mod is a folded waveguide (FWG) antenna designed to determine whether the FWG can serve as a high power density, ceramic-free antenna for both present heating and fast wave current drive (FWCD) applications and for future tokamaks such as the International Thermonuclear Experimental Reactor (ITER) and the Tokamak Physics Experiment (TPX). The FWG is particularly attractive because it has a l… more
Date: December 1, 1993
Creator: Fogelman, C. H.; Bigelow, T. S.; Carter, M. D.; Hoffman, D. J.; Riemer, B. W.; Yugo, J. J. et al.
Partner: UNT Libraries Government Documents Department
open access

Rf modeling and design of a folded waveguide launcher for the Alcator C-Mod tokamak

Description: The folded waveguide (FWG) launcher is being investigated as an improved antenna configuration for plasma heating in the ion cyclotron range of frequencies (ICRF). A development FWG launcher was successfully tested at Oak Ridge National Laboratory (ORNL) with a low-density plasma load and found to have significantly greater power density capability than current strap-type antennas operating in similar plasmas. To further test the concept on a high density tokamak plasma, a collaboration has bee… more
Date: December 1, 1993
Creator: Bigelow, T. S.; Fogelman, C. F.; Baity, F. W.; Carter, M. D.; Hoffman, D. J.; Ryan, P. M. et al.
Partner: UNT Libraries Government Documents Department
open access

The ORNL fast wave ICRF (Ion Cyclotron Range of Frequencies) antenna for Alcator C-Mod

Description: A fast wave ICRF antenna is being designed for Alcator C-Mod which is prototypical in many respects of the baseline launcher design for the Compact Ignition Tokamak (CIT). The C-Mod launcher has a single current strap, with a strap and cavity geometry very similar to one quadrant of the CIT launcher, which has four straps in a 2 {times} 2 configuration. The antenna fits entirely within an 8 in. wide by 25 in. long port and is radially movable over a distance of 15 cm. It will operate at a frequ… more
Date: January 1, 1989
Creator: Goulding, R. H.; Hoffman, D. J.; Conner, D. L.; Hammonds, C. J.; Ping, J. L.; Riemer, B. W. et al.
Partner: UNT Libraries Government Documents Department
open access

Technology of fast-wave current drive antennas

Description: The design of fast-wave current drive (FWCD) antennas combines the usual antenna considerations (e.g., the plasma/antenna interface, disruptions, high currents and voltages, and thermal loads) with new requirements for spectral shaping and phase control. The internal configuration of the antenna array has a profound effect on the spectrum and the ability to control phasing. This paper elaborates on these considerations, as epitomized by a proof-of-principle (POP) experiment designed for the DII… more
Date: January 1, 1989
Creator: Hoffman, D. J.; Baity, F. W.; Goulding, R. H.; Haste, G. R.; Ryan, P. M.; Taylor, D. J. et al.
Partner: UNT Libraries Government Documents Department
open access

ICRF heating on the burning plasma experiment (BPX)

Description: RF power in the ion cyclotron range of frequencies (ICRF) has been chosen as the primary heating technique for BPX. This decision is based on the wide success of ICRF heating in existing experiments (JET, TFTR, JT-60), the capability of ion cyclotron waves to penetrate the high-density plasmas of BPX, the ability to concentrate ICRF power deposition near the plasma center, and the ready availability of high-power sources at the appropriate frequency. The primary task of the ICRF system is to he… more
Date: January 1, 1991
Creator: Batchelor, D. B.; Carter, M. D.; Goulding, R. H.; Hoffman, D. J.; Jaeger, E. F.; Ryan, P. M. et al.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen