SAP2017 - List of Authors (Plum, M.A.)

Paper	Title	Page
MOPH31	Fringe Field Overlap Model for Quadrupoles	99
	H. Jia IMP/CAS, Lanzhou, People's Republic of China M.A. Plum ORNL, Oak Ridge, Tennessee, USA
	Funding: Funded by the China Scholarship Council In the large aperture-to-length ratio quadrupoles, there will be long fringe field. When putting three of this type quadrupoles next to each other, the field will overlap and change the beam dynamics of "hard-edge" model of Triplet quadrupoles. By numeric integration, we find that the transfer matrix difference is quite significant at the first part of MEBT of CADS Injector II. By re-exploring the 'hard-edge' model, the traditional definition of quadrupole's effective length and effective gradient are found to be just rough approximations and not right in this condition. The finding explains the good prediction of beam dyanamics model of MEBT by emittance measurements with different current settings of the triplet quadrupoles, and may be also helpful in explaining some discrepancies in beam lines around the world
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH31
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Paper

Title

Page

Fringe Field Overlap Model for Quadrupoles

99

H. Jia
IMP/CAS, Lanzhou, People's Republic of China
M.A. Plum
ORNL, Oak Ridge, Tennessee, USA

Funding: Funded by the China Scholarship Council
In the large aperture-to-length ratio quadrupoles, there will be long fringe field. When putting three of this type quadrupoles next to each other, the field will overlap and change the beam dynamics of "hard-edge" model of Triplet quadrupoles. By numeric integration, we find that the transfer matrix difference is quite significant at the first part of MEBT of CADS Injector II. By re-exploring the 'hard-edge' model, the traditional definition of quadrupole's effective length and effective gradient are found to be just rough approximations and not right in this condition. The finding explains the good prediction of beam dyanamics model of MEBT by emittance measurements with different current settings of the triplet quadrupoles, and may be also helpful in explaining some discrepancies in beam lines around the world

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH31

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)