Duoplasmatron source modifications for {sup 3}He{sup +} Operation

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Description

A duoplasmatron ion source is used to produce 25 mA of {sup 3}He+ with a pulse width of {approximately}80 ms at 360 Hz for acceleration to 10.5 MeV. At this energy, {sup 3}He striking water or carbon targets can produce short lived isotopes of {sup 11}C, {sup 13}N, {sup 15}O and {sup 18}F for medical positron emission tomography (PET). A duoplasmatron ion source was chosen originally since it is capable of a sufficient singly-charged helium beam with an acceptable gas consumption. Stable long-term operation of the source required a change in the filament material to molybdenum, and a careful understanding ... continued below

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5 p.; Other: FDE: POSTSCRIPT; PL:

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Schmidt, C.W. & Popovic, M. November 1, 1997.

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Description

A duoplasmatron ion source is used to produce 25 mA of {sup 3}He+ with a pulse width of {approximately}80 ms at 360 Hz for acceleration to 10.5 MeV. At this energy, {sup 3}He striking water or carbon targets can produce short lived isotopes of {sup 11}C, {sup 13}N, {sup 15}O and {sup 18}F for medical positron emission tomography (PET). A duoplasmatron ion source was chosen originally since it is capable of a sufficient singly-charged helium beam with an acceptable gas consumption. Stable long-term operation of the source required a change in the filament material to molybdenum, and a careful understanding of the oxide filament conditioning, operation and geometry. Other improvements, particularly in the electronics, were helpful to increasing the reliability. The source has operated for many months at {approximately}2.5% duty factor without significant problems and with good stability. We report here the effort that was done to make this source understandable and reliable.

Physical Description

5 p.; Other: FDE: POSTSCRIPT; PL:

Notes

INIS; OSTI as DE98050626

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  • 7. international conference on ion sources, Taormina (Italy), 7-13 Sep 1997

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  • Other: DE98050626
  • Report No.: FNAL/C--97/374
  • Report No.: CONF-970958--
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 572813
  • Archival Resource Key: ark:/67531/metadc698207

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  • November 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 1, 2016, 6:20 p.m.

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Schmidt, C.W. & Popovic, M. Duoplasmatron source modifications for {sup 3}He{sup +} Operation, article, November 1, 1997; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc698207/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.