Duoplasmatron source modifications for He-3+ operation

Conference · Sat Nov 01 04:00:00 EST 1997 · Rev.Sci.Instrum.

DOI:https://doi.org/10.1063/1.1148746· OSTI ID:572813

Schmidt, C. W. ^[1]; Popovic, M. ^[1]

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1. Fermilab

A duoplasmatron ion source is used to produce 25 mA of 3 He + with a pulse width of ∼80  ms at 360 Hz for acceleration to 10.5 MeV. At this energy, 3 He striking water or carbon targets can produce short lived isotopes of 11 C , 13 N , 15 O , and 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 ∼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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 572813
• Report Number(s): FERMILAB-CONF-97-374; oai:inspirehep.net:451084
• Conference Information: Journal Name: Rev.Sci.Instrum. Journal Volume: 69
• Country of Publication: United States
• Language: English

Related Subjects

DUOPLASMATRONS
HELIUM 3 BEAMS
ION SOURCES
MODIFICATIONS