Validity of coupling impedance bench measurements

Hahn, H.

doi:10.1103/physrevstab.3.122001

Cited by 19 publications

(12 citation statements)

References 3 publications

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“…The question to what degree the bench impedance is a valid representation of the beam impedance requires a separate analysis and is beyond the scope of this paper. Theoretical 7,8 and experimental 9 work indicates that a remarkable agreement between actual and measured impedance is achieved with sufficiently thin wires.…”

Section: Introductionmentioning

confidence: 87%

Interpretation of Coupling Impedance Bench Measurements

Hahn¹

2003

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Coupling impedance values of accelerator components can be obtained from standard bench measurements based on the coaxial wire method. The longitudinal impedance is obtained with one wire and the transverse impedance with a twin wire inserted into the "device under test". The coupling impedance follows from the interpretation of the scattering coefficients from a network analyzer. In this report, models and formulae applicable to the interpretation of the data are collected and reviewed, with emphasize on lumped and distributed kicker magnets.

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Section: Introductionmentioning

confidence: 87%

Interpretation of Coupling Impedance Bench Measurements

Hahn¹

2003

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“…The question of to what degree the bench impedance is a valid representation of the beam impedance requires a separate analysis [7] and is beyond the scope of this paper, although certain results of the field analysis [8] are used here for error estimates. Theoretical and experimental [9] work suggest that agreement between actual and measured impedance can be achieved which is sufficient for the design requirements of accelerator/storage rings if several caveats are respected.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of coupling impedance bench measurements

Hahn

2004

Phys. Rev. ST Accel. Beams

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Coupling impedance values of accelerator components can be obtained from standard bench measurements based on the coaxial wire method. Longitudinal impedance is obtained with one wire and the transverse impedance with a twin wire inserted into the ''device under test.'' The coupling impedance follows from the interpretation of the scattering coefficients from a network analyzer. In this paper, models and formulas applicable to the interpretation of the data are collected and reviewed. The paper is focused on lumped and distributed kicker magnets, for which a simulated measurement is numerically analyzed with the results graphically presented. This study suggests that the application of the standard lumped formula or the simple log formula for distributed impedances is appropriate.

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“…obtained in a reference tube of at least equal length and is interpreted according to the Hahn-Pedersen (HP) formula for lumped units [10],…”

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confidence: 99%

Improved analytical model of the transverse coupling impedance of ferrite kicker magnets

Davino

Hahn

2003

Phys. Rev. ST Accel. Beams

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A transformer model of ferrite kicker magnets is presented in this paper. Based on this model, an equivalent circuit is derived for which the elements can be obtained by bench measurements or by estimates from the magnet geometry. Improved formulas for the transverse coupling impedance of lumped and traveling wave kicker magnets are derived from the model and the equivalent circuit. The formulas differ from the corresponding handbook results in their dependence on the external termination or aperture aspect, respectively. The effect of ferrite properties on the transverse coupling impedance is analyzed. The model was confirmed by bench measurements with the twin-wire technique made on the full-size and half-size prototypes of the extraction kicker of the SNS accumulator ring. The application of this model to the design of the kickers allowed a significant reduction of the SNS transverse coupling impedance budget.

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Validity of coupling impedance bench measurements

Cited by 19 publications

References 3 publications

Interpretation of Coupling Impedance Bench Measurements

Interpretation of Coupling Impedance Bench Measurements

Interpretation of coupling impedance bench measurements

Improved analytical model of the transverse coupling impedance of ferrite kicker magnets

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