Author: Harold R. KaufmanPublisher:
ISBN:
Category : Electron bombardment conductivity
Languages : en
Pages : 44
Book Description
Performance Correlation for Electron-bombardment Ion Sources
Author: Harold R. KaufmanPublisher:
ISBN:
Category : Electron bombardment conductivity
Languages : en
Pages : 44
Book Description
Onset of Anomalous Diffusion in Electron-bombardment Ion Thrustor
Author: Allan J. CohenPublisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 36
Book Description
Ion-thruster Propellant Utilization
Author: Harold R. KaufmanPublisher:
ISBN:
Category : Electric propulsion
Languages : en
Pages : 68
Book Description
The evaluation and understanding of maximum propellant utilization, with mercury used as the propellant are presented. The primary-electron region in the ion chamber of a bombardment thruster is analyzed at maximum utilization. The results of this analysis, as well as experimental data from a range of ion-chamber configurations, show a nearly constant loss rate for unionized propellant at maximum utilization over a wide range of total propellant flow rate. The discharge loss level of 1000 eV/ion was used as a definition of maximum utilization, but the exact level of this definition has no effect on the qualitative results and little effect on the quantitative results. There are obvious design applications for the results of this investigation, but the results are particularly significant whenever efficient throttled operation is required.
NASA Technical Note
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 290
Book Description
Government-wide Index to Federal Research & Development Reports
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1050
Book Description
Monthly Catalog of United States Government Publications, Cumulative Index
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : United States
Languages : en
Pages : 1250
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1732
Book Description
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1572
Book Description
Analytic Performance of Two-grid Accelerator Designs for Kaufman Thrusters
Author: Walter C. LathemPublisher:
ISBN:
Category : Acceleration (Mechanics)
Languages : en
Pages : 36
Book Description
Results are presented for a theoretical analysis of the performance of two-grid accelerator systems for Kaufman thrusters. Six configurations were used to cover the range of geometries which are of immediate interest. A digital ccomputer program was used to find axially symetric solutions for a single hole of each configuration. Results are presented in terms of maximum current per hole, thrust per hole (including beam divergence effects), and maximum net-to total-voltage ratio consistent with the prevention of electron backstreaming. The results presented herein should be useful in the design of accelerator systems for a variety of applications. An analysis of the effects of charge-exchange ions on the erosion rate of the accelerator grid resulted in equations which could be used to predict the expected useful lifetime of the grid. The equations seemed consistent when theoretical results were compared with experimental results for the SERT II configuration. However, when applied to the configurations used in this analysis, limitations in the usefulness of the model were found and are presented herein.
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1248
Book Description
