Investigation of electromagnetic field perturbation with respect to mechanical imperfections in radio-frequency quadrupole (RFQ) structure

Ki R. Shin; Yoon W. Kang; Sang Ho Kim; Aly E. Fathy

doi:10.1109/TNS.2012.2206052

Investigation of electromagnetic field perturbation with respect to mechanical imperfections in radio-frequency quadrupole (RFQ) structure

Ki R. Shin, Yoon W. Kang, Sang Ho Kim, Aly E. Fathy

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

2 Scopus citations

Abstract

Electromagnetic (EM) fields near the beam axis in a radio frequency quadrupole (RFQ) are very sensitive to dimensional changes especially on vane tip geometries. Due to measurement difficulties, field distribution around the beam axis is generally assumed to be equal to that measured outside of vane gaps in quadrants using a bead-pull technique. If an RFQ structure has any mechanical imperfections in its vanes, local field distributions around the beam axis could be different from the design field profiles. The distorted field may affect beam quality as well as the operational stability and reliability of the RFQ system. In order to understand changes of field distribution in the RFQ against localized mechanical imperfections, a study with systematic 3D simulations has been carried out using a model developed for the RFQ in Spallation Neutron Source (SNS) of Oak Ridge National Laboratory. Field information at various locations such as around the beam-axis, bead-pull positions, and pickup probe positions are investigated with the vane tip perturbations. Design considerations for proper field retuning with perturbation are also presented and discussed to help future RFQ designs.

Original language	English
Article number	6265351
Pages (from-to)	2428-2434
Number of pages	7
Journal	IEEE Transactions on Nuclear Science
Volume	59
Issue number	5 PART 3
DOIs	https://doi.org/10.1109/TNS.2012.2206052
State	Published - 2012
Externally published	Yes

Funding

Manuscript received November 11, 2011; revised January 30, 2012; accepted March 30, 2012. Date of publication August 10, 2012; date of current version October 09, 2012. This work was supported by the SNS through UT-Battelle, LLC, under contract DE-AC05–00OR22725 for the U.S. DOE. The authors would like to thank the Basic Energy Sciences program of the U.S. DOE and the Research Accelerator Division of SNS for supporting this work.

Funders	Funder number
U.S. Department of Energy
Basic Energy Sciences
UT-Battelle	DE-AC05–00OR22725
SNS Nordic Forest Research

Keywords

Field distribution
mechanical imperfection
radio frequency quadrupole (RFQ)

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10.1109/TNS.2012.2206052

Cite this

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abstract = "Electromagnetic (EM) fields near the beam axis in a radio frequency quadrupole (RFQ) are very sensitive to dimensional changes especially on vane tip geometries. Due to measurement difficulties, field distribution around the beam axis is generally assumed to be equal to that measured outside of vane gaps in quadrants using a bead-pull technique. If an RFQ structure has any mechanical imperfections in its vanes, local field distributions around the beam axis could be different from the design field profiles. The distorted field may affect beam quality as well as the operational stability and reliability of the RFQ system. In order to understand changes of field distribution in the RFQ against localized mechanical imperfections, a study with systematic 3D simulations has been carried out using a model developed for the RFQ in Spallation Neutron Source (SNS) of Oak Ridge National Laboratory. Field information at various locations such as around the beam-axis, bead-pull positions, and pickup probe positions are investigated with the vane tip perturbations. Design considerations for proper field retuning with perturbation are also presented and discussed to help future RFQ designs.",

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N2 - Electromagnetic (EM) fields near the beam axis in a radio frequency quadrupole (RFQ) are very sensitive to dimensional changes especially on vane tip geometries. Due to measurement difficulties, field distribution around the beam axis is generally assumed to be equal to that measured outside of vane gaps in quadrants using a bead-pull technique. If an RFQ structure has any mechanical imperfections in its vanes, local field distributions around the beam axis could be different from the design field profiles. The distorted field may affect beam quality as well as the operational stability and reliability of the RFQ system. In order to understand changes of field distribution in the RFQ against localized mechanical imperfections, a study with systematic 3D simulations has been carried out using a model developed for the RFQ in Spallation Neutron Source (SNS) of Oak Ridge National Laboratory. Field information at various locations such as around the beam-axis, bead-pull positions, and pickup probe positions are investigated with the vane tip perturbations. Design considerations for proper field retuning with perturbation are also presented and discussed to help future RFQ designs.

AB - Electromagnetic (EM) fields near the beam axis in a radio frequency quadrupole (RFQ) are very sensitive to dimensional changes especially on vane tip geometries. Due to measurement difficulties, field distribution around the beam axis is generally assumed to be equal to that measured outside of vane gaps in quadrants using a bead-pull technique. If an RFQ structure has any mechanical imperfections in its vanes, local field distributions around the beam axis could be different from the design field profiles. The distorted field may affect beam quality as well as the operational stability and reliability of the RFQ system. In order to understand changes of field distribution in the RFQ against localized mechanical imperfections, a study with systematic 3D simulations has been carried out using a model developed for the RFQ in Spallation Neutron Source (SNS) of Oak Ridge National Laboratory. Field information at various locations such as around the beam-axis, bead-pull positions, and pickup probe positions are investigated with the vane tip perturbations. Design considerations for proper field retuning with perturbation are also presented and discussed to help future RFQ designs.

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Investigation of electromagnetic field perturbation with respect to mechanical imperfections in radio-frequency quadrupole (RFQ) structure

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