Permanent-magnet quadrupoles in RFQ Linacs

Lysenko, W P; Wang, T F

Title: Permanent-magnet quadrupoles in RFQ Linacs

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Abstract

We investigated the possibility of increasing the current-carrying capability of radio-frequency quadrupole (RFQ) linear accelerators by adding permanentmagnet quadrupole (PMQ) focusing to the existing transverse focusing provided by the rf electric field. Increased transverse focusing would also allow shortening RFQ linacs by permitting a larger accelerating gradient, which is normally accompanied by an undesirable increased transverse rf defocusing effect. We found that PMQs were not helpful in increasing the transverse focusing strength in an RFQ. This conclusion was reached after some particle tracing simulations and some analytical calculations. In our parameter regime, the addition of the magnets increases the betatron frequency but does not result in improved focusing because the increased flutter more than offsets the gain from the increased betatron frequency.

Authors:: Lysenko, W P; Wang, T F

Publication Date:: Tue Oct 01 00:00:00 EDT 1985

Research Org.:: Los Alamos National Laboratory, Los Alamos, NM

OSTI Identifier:: 6189509

Report Number(s):: CONF-850504-
Journal ID: CODEN: IETNA; TRN: 86-004320

Resource Type:: Conference

Journal Name:: IEEE Trans. Nucl. Sci.; (United States)

Additional Journal Information:: Journal Volume: NS-32:5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; QUADRUPOLE LINACS; BEAM FOCUSING MAGNETS; PERMANENT MAGNETS; BEAM DYNAMICS; BEAM TRANSPORT; BETATRON OSCILLATIONS; FEASIBILITY STUDIES; RF SYSTEMS; ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; LINEAR ACCELERATORS; MAGNETS; OSCILLATIONS; 430303* - Particle Accelerators- Experimental Facilities & Equipment

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                    Lysenko, W P, and Wang, T F. Permanent-magnet quadrupoles in RFQ Linacs.  United States: N. p., 1985. 
        Web.

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                    Lysenko, W P, & Wang, T F. Permanent-magnet quadrupoles in RFQ Linacs.  United States.

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                    Lysenko, W P, and Wang, T F. 1985.  
        "Permanent-magnet quadrupoles in RFQ Linacs".  United States.

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@article{osti_6189509,

  title        = {Permanent-magnet quadrupoles in RFQ Linacs},

  author       = {Lysenko, W P and Wang, T F},

  abstractNote = {We investigated the possibility of increasing the current-carrying capability of radio-frequency quadrupole (RFQ) linear accelerators by adding permanentmagnet quadrupole (PMQ) focusing to the existing transverse focusing provided by the rf electric field. Increased transverse focusing would also allow shortening RFQ linacs by permitting a larger accelerating gradient, which is normally accompanied by an undesirable increased transverse rf defocusing effect. We found that PMQs were not helpful in increasing the transverse focusing strength in an RFQ. This conclusion was reached after some particle tracing simulations and some analytical calculations. In our parameter regime, the addition of the magnets increases the betatron frequency but does not result in improved focusing because the increased flutter more than offsets the gain from the increased betatron frequency.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6189509},
  journal      = {IEEE Trans. Nucl. Sci.; (United States)},
number       = ,

  volume       = NS-32:5,

  place        = {United States},

  year         = {Tue Oct 01 00:00:00 EDT 1985},

  month        = {Tue Oct 01 00:00:00 EDT 1985}

}

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