Improvements on the stability and operation of a magnetron H − ion source

Sosa, A.; Bollinger, D. S.; Karns, P. R.; Tan, C. Y.

doi:10.1103/PhysRevAccelBeams.20.050102

Title: Improvements on the stability and operation of a magnetron $H^{-}$ ion source

Abstract

The magnetron H^- ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated offline test stand with the aim of improving different operational issues. The solenoid type gas valve was tested as an alternative to the piezoelectric gas valve in order to avoid its temperature dependence. A new cesium oven was designed and tested in order to avoid glass pieces that were present with the previous oven, improve thermal insulation and fine tune its temperature. A current-regulated arc modulator was developed to run the ion source at a constant arc current, providing very stable beam outputs during operations. In order to reduce beam noise, the addition of small amounts of N₂ gas was explored, as well as testing different cathode shapes with increasing plasma volume. This study summarizes the studies and modifications done in the source over the last three years with the aim of improving its stability, reliability and overall performance.

Authors:: Sosa, A.; Bollinger, D. S.; Karns, P. R.; Tan, C. Y.

Publication Date:: Wed May 31 00:00:00 EDT 2017

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1360994

Alternate Identifier(s):: OSTI ID: 1346363

Report Number(s):: FERMILAB-PUB-17-009-AD; arXiv:1701.01757
Journal ID: ISSN 2469-9888; PRABCJ; 050102

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Published Article

Journal Name:: Physical Review Accelerators and Beams

Additional Journal Information:: Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 5; Journal ID: ISSN 2469-9888

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS

Citation Formats


                    Sosa, A., Bollinger, D. S., Karns, P. R., and Tan, C. Y. Improvements on the stability and operation of a magnetron H − ion source.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevAccelBeams.20.050102.

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                    Sosa, A., Bollinger, D. S., Karns, P. R., & Tan, C. Y. Improvements on the stability and operation of a magnetron H − ion source.  United States.  https://doi.org/10.1103/PhysRevAccelBeams.20.050102

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                    Sosa, A., Bollinger, D. S., Karns, P. R., and Tan, C. Y. Wed .  
"Improvements on the stability and operation of a magnetron H − ion source".  United States.  https://doi.org/10.1103/PhysRevAccelBeams.20.050102.

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@article{osti_1360994,

  title        = {Improvements on the stability and operation of a magnetron H − ion source},

  author       = {Sosa, A. and Bollinger, D. S. and Karns, P. R. and Tan, C. Y.},

  abstractNote = {The magnetron H- ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated offline test stand with the aim of improving different operational issues. The solenoid type gas valve was tested as an alternative to the piezoelectric gas valve in order to avoid its temperature dependence. A new cesium oven was designed and tested in order to avoid glass pieces that were present with the previous oven, improve thermal insulation and fine tune its temperature. A current-regulated arc modulator was developed to run the ion source at a constant arc current, providing very stable beam outputs during operations. In order to reduce beam noise, the addition of small amounts of N2 gas was explored, as well as testing different cathode shapes with increasing plasma volume. This study summarizes the studies and modifications done in the source over the last three years with the aim of improving its stability, reliability and overall performance.},

  doi          = {10.1103/PhysRevAccelBeams.20.050102},

  journal      = {Physical Review Accelerators and Beams},

  number       = 5,

  volume       = 20,

  place        = {United States},

  year         = {Wed May 31 00:00:00 EDT 2017},

  month        = {Wed May 31 00:00:00 EDT 2017}

}

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https://doi.org/10.1103/PhysRevAccelBeams.20.050102

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Figures / Tables:

FIG. 1: Schematic of Fermilab’s magnetron H⁻ source.

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Works referenced in this record:

A new solid state extractor pulser for the FNAL magnetron ion source
journal, February 2016

Bollinger, D. S.; Lackey, J.; Larson, J.
Review of Scientific Instruments, Vol. 87, Issue 2
DOI: 10.1063/1.4932121

Reduction of beam current noise in the FNAL magnetron ion source
conference, January 2015

Bollinger, D. S.; Karns, P. R.; Tan, C. Y.
FOURTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2014), AIP Conference Proceedings
DOI: 10.1063/1.4916482

A Direct Extraction H- Ion Source
journal, June 1977

Allison, Paul W.
IEEE Transactions on Nuclear Science, Vol. 24, Issue 3
DOI: 10.1109/TNS.1977.4329022

Performance of the Magnetron H− Source on the BNL 200 MeV Linac
conference, January 2002

Alessi, James G.
HIGH INTENSITY AND HIGH BRIGHTNESS HADRON BEAMS: 20th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams ICFA-HB2002, AIP Conference Proceedings
DOI: 10.1063/1.1522646

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Similar Records

Title: Improvements on the stability and operation of a magnetron H − ion source

Abstract

Citation Formats

Figures / Tables:

A new solid state extractor pulser for the FNAL magnetron ion source journal, February 2016

Reduction of beam current noise in the FNAL magnetron ion source conference, January 2015

A Direct Extraction H- Ion Source journal, June 1977

Performance of the Magnetron H− Source on the BNL 200 MeV Linac conference, January 2002

Title: Improvements on the stability and operation of a magnetron $H^{-}$ ion source

A new solid state extractor pulser for the FNAL magnetron ion source
journal, February 2016

Reduction of beam current noise in the FNAL magnetron ion source
conference, January 2015

A Direct Extraction H- Ion Source
journal, June 1977

Performance of the Magnetron H− Source on the BNL 200 MeV Linac
conference, January 2002