Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Wulf B. Kunkel"'
Autor:
P. Purgalis, C. F. Chan, Wulf B. Kunkel, W. F. Steele, Ka-Ngo Leung, O. A. Anderson, G. J. deVries, G. D. Ackerman, J.W. Kwan, Russell Wells, W. S. Cooper
Publikováno v:
Review of Scientific Instruments. 62:1521-1526
In testing a cesiated volume‐production negative ion source, we have obtained 75 mA of H− beam current in a 270 ms pulse length delivered downstream of the 87 keV preaccelerator. Optimum pressure in the source was less than 8 mT and the electron
Autor:
W. F. DiVergilio, R. W. Hamm, Ka-Ngo Leung, G. J. deVries, Wulf B. Kunkel, C. A. Hauck, M. D. Williams, D. S. McDonald
Publikováno v:
Review of Scientific Instruments. 62:100-104
An rf driven multicusp source capable of generating 1-ms H{sup -} beam pulses with a repetition rate as high as 150 Hz has been developed. This source can be operated with a filament or other types of starter. There is almost no lifetime limitation a
Autor:
A. F. Lietzke, P. Purgalis, Ka-Ngo Leung, C. A. Hauck, Russell Wells, O. A. Anderson, J.W. Kwan, G. J. deVries, W. S. Cooper, Wulf B. Kunkel, C. F. Chan
Publikováno v:
Review of Scientific Instruments. 61:2378-2382
Based on recent experimental results made on the large and small multicusp volume H− sources, a new multicusp source has been designed to generate high‐brightness H− or D− beams for high duty factor or dc operations. Cesium will be introduced
Autor:
Wulf B. Kunkel
Publikováno v:
Review of Scientific Instruments. 61:354-359
All large tokamak fusion experiments today use auxiliary heating by multimegawatt beams of neutral isotopes of hydrogen injected with energies in the neighborhood of 100 keV per atom. This requires reliable operation of large ion souces, each deliver
Publikováno v:
Physics Today. 45:86-88
Autor:
Ka-Ngo Leung, W. F. DiVergilio, D. S. McDonald, Wulf B. Kunkel, D. A. Bachman, M. D. Williams
Publikováno v:
Review of Scientific Instruments. 63:2741-2743
The use of a rf‐induction discharge as a H− source is attractive for long life, pulsed, or cw operation. Recently, a new rf‐driven, magnetically filtered multicusp source has been developed at LBL to generate volume‐produced H− beams with e
Autor:
C. F. Chan, Wulf B. Kunkel, W. F. Steele, Russell Wells, C. F. A. van Os, Ka-Ngo Leung, M. D. Williams, G. J. deVries, A. F. Lietzke, O. A. Anderson, J.W. Kwan, W. S. Cooper
Publikováno v:
Review of Scientific Instruments. 63:2705-2707
A D− surface‐conversion source using a solid barium converter is designed for steady‐state operation to produce 200 mA of D−. A similar ion source of twice the size as the one discussed here will meet the requirements set by the present US‐
Publikováno v:
Review of Scientific Instruments. 61:619-621
The role of highly vibrationally excited hydrogen molecules has been postulated to be of great importance in H− ion sources. However the the difficulty of making in situ measurements has led to a paucity of direct determinations of these species wi
Publikováno v:
AIP Conference Proceedings.
Recent results of surface produced negative ions are presented. Two low work function metal surfaces have been studied, barium and magnesium, in combination with several plasma generators; RF‐ and DC‐filament discharges. The negative ion yield fo
Autor:
Wulf B. Kunkel, Kurt F. Schoenberg
Publikováno v:
Journal of Applied Physics. 50:4685-4691
The general plasma characteristics of a Berkeley Multifilament Ion Source are presented. The measurements are obtained via a pulsed electrostatic‐probe data‐acquisition system, and in part conclude: (a) The electron distribution function consists