Results from a double Vlasov model for negative ion extraction from volume sources

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Description

A new negative ion source-extraction model has been formulated and implemented which explicitly considers the motion of positive ions and the volume generation of negative ions. It is found that: (1) for high-beam currents, the beam current is limited by a transverse space-charge limit, not an emission limit; (2) there is a saddle point with a concomitant potential barrier preventing most volume produced negative ions from being extracted (the combination of 1 and 2 indicates that in some interesting cases there is the opportunity to increase extraction currents above values presently observed); (3) introduction of cesium may cause an actual ... continued below

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8 p.

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Olsen, D.K.; Raridon, R.J. & Whealton, J.H. July 1, 1998.

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Description

A new negative ion source-extraction model has been formulated and implemented which explicitly considers the motion of positive ions and the volume generation of negative ions. It is found that: (1) for high-beam currents, the beam current is limited by a transverse space-charge limit, not an emission limit; (2) there is a saddle point with a concomitant potential barrier preventing most volume produced negative ions from being extracted (the combination of 1 and 2 indicates that in some interesting cases there is the opportunity to increase extraction currents above values presently observed); (3) introduction of cesium may cause an actual increase in the transverse space-charge limit by accumulation of positive ions of cesium in the presheath.

Physical Description

8 p.

Notes

INIS; OSTI as DE98005993

Source

  • EPAC 1998: 6. European particle accelerator conference, Stockholm (Sweden), 22-26 Jun 1998

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  • Other: DE98005993
  • Report No.: ORNL/CP--98705
  • Report No.: CONF-980671--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/638208 | External Link
  • Office of Scientific & Technical Information Report Number: 638208
  • Archival Resource Key: ark:/67531/metadc696978

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  • July 1, 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 20, 2016, 6:18 p.m.

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Olsen, D.K.; Raridon, R.J. & Whealton, J.H. Results from a double Vlasov model for negative ion extraction from volume sources, report, July 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc696978/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.