Multipactor in a Coaxial Line Under the Presence of an Axial DC Magnetic Field

Gonzalez-Iglesias, D.; Pérez, Antonio Martín; Anza, S.; Vague, Joaquin; Gimeno, B.; Boria, Vicente E.; Raboso, D.; Vicente, C.; Gil, J.; Caspers, F.; Conde, Luis

doi:10.1109/led.2012.2186952

Cited by 22 publications

(12 citation statements)

References 10 publications

(8 reference statements)

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“…The multipactor effect in a coaxial line under the presence of a uniform axial static magnetic field was investigated in a previous paper [8]. These results evidence that RF power thresholds (the lowest RF power value at which the multipactor discharge appears) are strongly influenced by the magnitude of the magnetic field.…”

Section: Introductionmentioning

confidence: 74%

“…[8]. The experimental set-up is the standard one, commonly employed in multipactor measurements is shown in Fig.…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

“…The uniform static axial magnetic field is applied by means of a long solenoid, where the sample in inserted. Theoretical results show that multipactor resonant electron trajectories are disturbed by the presence of an external uniform axial DC magnetic field [8]. In this case, the equations of motion of the effective electron are simplified since B ext,r = 0.…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

“…In Ref. [8] the case of f = 1.145 GHz in Fig. 3 was analyzed by examining the electron trajectories at some relevant points of the multipactor power threshold curve.…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

“…3 together with the theoretical ones. It should be mentioned that although some experimental measurements for f = 1.145 GHz were previously presented in [8], new measurements have been performed in order to explore the multipactor-free zone for higher f c /f values. These new measurements are summarized in Table I, where it is indicated the magnitude of the static axial magnetic field B DC , the corresponding ratio f c /f , and the maximum level of RF input power available in the experimental test-bed P max .…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

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Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Gonzalez-Iglesias

Pérez

Anza³

et al. 2014

IEEE Trans. Electron Devices

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The main aim of this paper is the analysis of the feasibility of employing permanent magnets for the multipactor mitigation in a coaxial waveguide. First, the study of a coaxial line immersed in a uniform axial magnetic field shows that multipactor can be suppressed at any RF frequency if the external magnetic field is strong enough. Both theoretical simulations and experimental tests validate this statement. Next, multipactor breakdown of a coaxial line immersed in a hollow cylindrical permanent magnet is analyzed. Numerical simulations show that multipactor can be suppressed in a certain RF frequency range. The performed experimental test campaign demonstrates the capability of the magnet to avoid the multipactor electron multiplication process.

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Section: Introductionmentioning

confidence: 74%

“…[8]. The experimental set-up is the standard one, commonly employed in multipactor measurements is shown in Fig.…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

“…In Ref. [8] the case of f = 1.145 GHz in Fig. 3 was analyzed by examining the electron trajectories at some relevant points of the multipactor power threshold curve.…”

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

Section: A Uniform Static Axial Magnetic Fieldmentioning

confidence: 99%

See 3 more Smart Citations

Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Gonzalez-Iglesias

Pérez

Anza³

et al. 2014

IEEE Trans. Electron Devices

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Ping-pong modes and higher-periodicity multipactor

Kishek

2013

Physics of Plasmas

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Multipactor is a vacuum discharge driven by secondary electron emission. Multiple period multipactors have long been known to exist but have been studied less extensively. In a period-n multipactor, electrons undergo multiple impacts in one rf period, with the synchronous phase alternating periodically between multiple values. A novel resonant form is proposed that combines one- and two-surface impacts within a single period, provided the total transit time is an odd number of rf half-periods and the product of secondary yields exceeds unity. For low fD products, the simplest such mode is shown to significantly increase the upper electric field boundary of the multipacting region and lead to overlap of higher-order bands. The results agree nicely with 3-D particle-in-cell code simulations. An alternative, map-based method is introduced for analyzing higher-periodicity multipactor. Practical implications of the findings are discussed, including consequences for multipactor suppression strategies using a dc magnetic field.

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Observation of multipactor suppression in a dielectric-loaded accelerating structure using an applied axial magnetic field

Jing

Chang

Gold

et al. 2013

Applied Physics Letters

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Efforts by a number of institutions to develop a Dielectric-Loaded Accelerating (DLA) structure capable of supporting high gradient acceleration when driven by an external radio frequency source have been ongoing over the past decade. Single surface resonant multipactor has been previously identified as one of the major limitations on the practical application of DLA structures in electron accelerators. In this paper, we report the results of an experiment that demonstrated suppression of multipactor growth in an X-band DLA structure through the use of an applied axial magnetic field. This represents an advance toward the practical use of DLA structures in many accelerator applications.

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Multipactor in a Coaxial Line Under the Presence of an Axial DC Magnetic Field

Cited by 22 publications

References 10 publications

Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Ping-pong modes and higher-periodicity multipactor

Observation of multipactor suppression in a dielectric-loaded accelerating structure using an applied axial magnetic field

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