Time-dependent degradation of an ion-focused ATA beam

W. M. Fawley, J. K. Boyd, George J Caporaso, F. W. Chambers, Y. P. Chong, J. S. Hildum, P. Lee, T. J. Orzechowski, D. R. Rogers, K. W. Struve, J. T. Weir

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Detailed measurements of the time-dependent beam quality of an ATA (Advanced Test Accelerator) pulse transported on a KrF laser-photoionized benzene channel were performed. It was found that the tail portion (τ ≥ 20-30 ns) of the pulse becomes severely degraded both at high currents (I > 3 kA) and at long transport distances. Nonaxisymmetric channel ion motion is suspected as the predominant source of the problem. The authors discuss various experiments which varied laser properties (timing, fluence, profiles), background ion pressure, and electron beam current in order to study the physics behind this degradation.

Original languageEnglish (US)
Title of host publicationProc 1989 IEEE Part Accel Conf
EditorsFloyd Bennett, Joyce Kopta
Place of PublicationPiscataway, NJ, United States
PublisherPubl by IEEE
Number of pages3
StatePublished - 1989
Externally publishedYes
EventProceedings of the 1989 IEEE Particle Accelerator Conference - Chicago, IL, USA
Duration: Mar 20 1989Mar 23 1989


OtherProceedings of the 1989 IEEE Particle Accelerator Conference
CityChicago, IL, USA

ASJC Scopus subject areas

  • Engineering(all)


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