RFQ Linac Structure Developments at CRNL

Hutcheon, R. M.; Hansborough, L.D.; Hohban, K. J.; Schriber, S. O.

doi:10.1109/tns.1983.4336712

Cited by 4 publications

(5 citation statements)

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“…However, the window-coupled RFQ requires higher power consumption because of the higher rf current density [34]. The double-dipole (DD) RFQ structure, firstly proposed by CRNL in 1983 [8], can effectively enlarge the mode separation of RFQs of a specific length by simply modifying the undercut scheme instead of adding additional stabilizers [9]. In contrast with the undercut in the four-vane conventional (4C) RFQ, the DD RFQ employs undercuts at both ends of only two opposing vanes, while the other two vanes are short-circuited at both ends, as shown in figure 13.…”

Section: Double-dipole Four-vane Structurementioning

confidence: 99%

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Wang

et al. 2020

J. Inst.

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Section: Double-dipole Four-vane Structurementioning

confidence: 99%

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Wang

et al. 2020

J. Inst.

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“…A DD RFQ structure [6] was previously analyzed in mid-1980 using 2-D CAD tools. However, it was rarely used because of its drawbacks.…”

Section: Simulation Accuracy Of a Short Dd Rfqmentioning

confidence: 99%

“…5 is utilized in this study for both 4C and DD cut-backs. Since there is a measured field result for DD [6], we first present a comparison of the simulated and measured field results of the DD RFQ case.…”

Section: Field Simulation Accuracymentioning

confidence: 99%

“…Previously proposed 2-D simulations were not adequate to precisely handle such problems [6], and could not calculate harmonics and modal field distributions; especially if any nonuniform perturbation analysis was needed. Therefore, recently 3-D simulation studies have been adopted to analyze and design RFQs with high accuracy [4] [5].…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 3 describes two RFQ types: the previously analyzed four cut-back (4C) structure [1], and the alternate double dipole (DD) structure [6] that could offer significant performance improvement.…”

Section: Introductionmentioning

confidence: 99%

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Radio frequency quadrupole cavity structure for particle accelerators — Simulation and measurements

Shin

Kang

Champion

et al. 2013

2013 IEEE MTT-S International Microwave Symposium Digest (MTT)

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EM simulation of long RFQ with quadruple ridge (vane) waveguide structure with narrow vane gaps and vane end cutbacks is a complex and challenging task. Advances in 3-D EM simulation tools in recent years can lead to accurate analysis of such structures. Here, we present the simulation of long RFQs (over 2Ȝ), validate our results with measurements, compare simulated results of eigenmode frequencies and field distribution to measured values, and finally extend our analysis to an alternative and very promising design noted as double dipole structure. Excellent agreement between measurement and simulation has been attained and design comparison between the long double dipole and the traditional RFQs has been developed.

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100% Duty Factor RFQ Linac Systems at CRNL

Hutcheon

Brown

Hansborough

et al. 1983

IEEE Trans. Nucl. Sci.

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Chalk River Nuclear LaboratoriesChalk River, Ontario, Canada KOJ IJO Sumina ry An RFQ linac operating at 100% duty factor (cw) and high currents is required for an accel erator breeder. Two high power structures are being built as part of the RFQ development program. Firstly, a copper 270 MHz "sparker" cavity with RFQ geometry is being tested to determine cw field breakdown levels and conditioning characteristics. The desi gn and status of the "sparker" are presented. Secondly, a 270 MHz cw RFQ linac (RFQ1) is being designed to accelerate a nominal 75 miA from 50 to 600 keV, to study beam quality and stability as well as resonator field tuning and leveling requirements under conditions of high beam loss at high average power. For example, the combination of cw operation and restricted space at the entrance require new approaches in end terminations and tuners. The status of RFQ1 is presented and design innovations outlined. IntroductionThe low enerly beamn latinching section of an accelerator breeder , as now envisaged, requires a 300 mA 100% duty factor RFQ. This presents new design problenis, for the current is to be much higher than in existing designs, implying either increased vane voltage or increased bore hole size.Since the rf power increases very rapidly with bore hole radius ( r4), it is important to operate at the highest practical voltage gradient, i.e., just safely below the conditioned sparking limit. Although such limits have been studied for relatively high duty factor operation2, no definite information is available for cw operation, especially under conditions of high beam current, noderate beam spill, and a resulting high background pressure.

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RFQ Linac Structure Developments at CRNL

Cited by 4 publications

References 0 publications

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Radio frequency quadrupole cavity structure for particle accelerators — Simulation and measurements

100% Duty Factor RFQ Linac Systems at CRNL

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RFQ Linac Structure Developments at CRNL

Cited by 4 publications

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Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Novel deuteron RFQ design with trapezoidal electrodes and double dipole four-vane structure

Radio frequency quadrupole cavity structure for particle accelerators &#x2014; Simulation and measurements

100% Duty Factor RFQ Linac Systems at CRNL

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Radio frequency quadrupole cavity structure for particle accelerators — Simulation and measurements