H- ion source developments at the SNS

R. F. Welton; M. P. Stockli; S. N. Murray; T. R. Pennisi; B. Han; Y. Kang; R. H. Goulding; D. W. Crisp; D. O. Sparks; N. P. Luciano; J. R. Carmichael; J. Carr

doi:10.1063/1.2816937

H^- ion source developments at the SNS

R. F. Welton
, M. P. Stockli
, S. N. Murray
, T. R. Pennisi
, B. Han
, Y. Kang
, R. H. Goulding
, D. W. Crisp
, D. O. Sparks
, N. P. Luciano
, J. R. Carmichael
, J. Carr

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The U.S. Spallation Neutron Source (SNS) will require substantially higher average and pulse H- beam currents than can be produced from conventional ion sources such as the base line SNS source. H- currents of 40-50 mA (SNS operations) and 70-100 mA (power upgrade project) with a rms emittance of 0.20-0.35π mm mrad and a ∼7% duty factor will be needed. We are therefore investigating several advanced ion source concepts based on rf plasma excitation. First, the performance characteristics of an external antenna source based on an Al2 O3 plasma chamber combined with an external multicusp magnetic configuration, an elemental Cs system, and plasma gun will be discussed. Second, the first plasma measurements of a helicon-driven H- ion source will also be presented.

Original language	English
Article number	02C721
Journal	Review of Scientific Instruments
Volume	79
Issue number	2
DOIs	https://doi.org/10.1063/1.2816937
State	Published - 2008

Funding

ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.

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10.1063/1.2816937

Cite this

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title = "H- ion source developments at the SNS",

abstract = "The U.S. Spallation Neutron Source (SNS) will require substantially higher average and pulse H- beam currents than can be produced from conventional ion sources such as the base line SNS source. H- currents of 40-50 mA (SNS operations) and 70-100 mA (power upgrade project) with a rms emittance of 0.20-0.35π mm mrad and a ∼7\% duty factor will be needed. We are therefore investigating several advanced ion source concepts based on rf plasma excitation. First, the performance characteristics of an external antenna source based on an Al2 O3 plasma chamber combined with an external multicusp magnetic configuration, an elemental Cs system, and plasma gun will be discussed. Second, the first plasma measurements of a helicon-driven H- ion source will also be presented.",

author = "Welton, \{R. F.\} and Stockli, \{M. P.\} and Murray, \{S. N.\} and Pennisi, \{T. R.\} and B. Han and Y. Kang and Goulding, \{R. H.\} and Crisp, \{D. W.\} and Sparks, \{D. O.\} and Luciano, \{N. P.\} and Carmichael, \{J. R.\} and J. Carr",

year = "2008",

doi = "10.1063/1.2816937",

language = "English",

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journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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T1 - H- ion source developments at the SNS

AU - Welton, R. F.

AU - Stockli, M. P.

AU - Murray, S. N.

AU - Pennisi, T. R.

AU - Han, B.

AU - Kang, Y.

AU - Goulding, R. H.

AU - Crisp, D. W.

AU - Sparks, D. O.

AU - Luciano, N. P.

AU - Carmichael, J. R.

AU - Carr, J.

PY - 2008

Y1 - 2008

N2 - The U.S. Spallation Neutron Source (SNS) will require substantially higher average and pulse H- beam currents than can be produced from conventional ion sources such as the base line SNS source. H- currents of 40-50 mA (SNS operations) and 70-100 mA (power upgrade project) with a rms emittance of 0.20-0.35π mm mrad and a ∼7% duty factor will be needed. We are therefore investigating several advanced ion source concepts based on rf plasma excitation. First, the performance characteristics of an external antenna source based on an Al2 O3 plasma chamber combined with an external multicusp magnetic configuration, an elemental Cs system, and plasma gun will be discussed. Second, the first plasma measurements of a helicon-driven H- ion source will also be presented.

AB - The U.S. Spallation Neutron Source (SNS) will require substantially higher average and pulse H- beam currents than can be produced from conventional ion sources such as the base line SNS source. H- currents of 40-50 mA (SNS operations) and 70-100 mA (power upgrade project) with a rms emittance of 0.20-0.35π mm mrad and a ∼7% duty factor will be needed. We are therefore investigating several advanced ion source concepts based on rf plasma excitation. First, the performance characteristics of an external antenna source based on an Al2 O3 plasma chamber combined with an external multicusp magnetic configuration, an elemental Cs system, and plasma gun will be discussed. Second, the first plasma measurements of a helicon-driven H- ion source will also be presented.

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DO - 10.1063/1.2816937

M3 - Article

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SN - 0034-6748

VL - 79

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 2

M1 - 02C721

ER -

H^- ion source developments at the SNS

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