Controlling backstreaming ions from X-ray converter targets with time varying final focusing solenoidal lens and beam energy variation

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Backstreaming ions emitted from an x-ray converter hit by a tightly focused intense electron beam can form an ion focusing channel and over-focus the electron beam. As the ions move upstream in time, the net focusing strength increases. The final beam spot size on the target would then change in time and typically be larger than intended. We have developed a model to estimate the backstreaming ions� neutralization factor in a potential sheath near the target surface and away from the sheath. Performance of high resolution x-ray radiography facilities requires high current electron beams to be focused to a millimeter ... continued below

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Caporaso, G J; Chen, Yu-Jiuan & Paul, A August 20, 1998.

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Backstreaming ions emitted from an x-ray converter hit by a tightly focused intense electron beam can form an ion focusing channel and over-focus the electron beam. As the ions move upstream in time, the net focusing strength increases. The final beam spot size on the target would then change in time and typically be larger than intended. We have developed a model to estimate the backstreaming ions� neutralization factor in a potential sheath near the target surface and away from the sheath. Performance of high resolution x-ray radiography facilities requires high current electron beams to be focused to a millimeter spot size on an x-ray converter through out the entire current pulse. We have studied the possibility of maintaining a constant final spot size for the entire pulse by using either a time varying final focusing solenoid field or beam energy variation to compensate the time varying ion focusing effects

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618 Kilobytes

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  • 19th International Linear Accelerator Conference, Chicago, IL, August 23-28,1998

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  • Other: DE00007641
  • Report No.: UCRL-JC-130591
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7641
  • Archival Resource Key: ark:/67531/metadc717285

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  • August 20, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 9:38 p.m.

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Caporaso, G J; Chen, Yu-Jiuan & Paul, A. Controlling backstreaming ions from X-ray converter targets with time varying final focusing solenoidal lens and beam energy variation, article, August 20, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc717285/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.