Cathode ion bombardment in rf photoguns

Pozdeyev, E.; Kayran, D.; Litvinenko, V.N.

doi:10.1103/physrevstab.12.043501

Cited by 4 publications

(22 citation statements)

References 6 publications

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“…For the convenience of instability analysis for a given perturbation wavenumber k, some beam physicists prefer to express the LSC impedances directly as a function of k instead of  (for example, Refs. [2,4,6,7,8,17,22]). If we choose the bunch center as reference point for the longitudinal coordinate, Eqs.…”

Section: Lsc Impedances Of a Round Beam Between Parallel Plates And Imentioning

confidence: 99%

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Approximate longitudinal space charge impedances of a round beam between parallel plates and inside a rectangular chamber

Li¹,

Wang²

2015

Nuclear Instruments and Methods in Physics Research Section A:

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This paper presents the approximate analytical solutions to the longitudinal space charge (LSC) impedances of a round beam with uniform transverse distribution and sinusoidal line density modulations under two boundary conditions: (a) between parallel plates (b) inside a rectangular chamber, respectively. When the ratio of beam diameter to chamber height is small, the image charge fields of the round beam can be approximated by those of a line charge, the approximate analytical LSC impedances can be obtained by image method. The derived theoretical LSC impedances are valid at any perturbation wavelength and are consistent well with the numerical simulation results in a large range of ratios of beam diameters to chamber heights.

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Section: Lsc Impedances Of a Round Beam Between Parallel Plates And Imentioning

confidence: 99%

“…The longitudinal space charge (LSC) effect plays an important role in the microwave instability of low energy beam with high intensity near or above transition [1][2][3]. It is also one of the important reasons causing the micro-bunching instability for free-electron lasers (FELs) [4].…”

Section: Introductionmentioning

confidence: 99%

Approximate longitudinal space charge impedances of a round beam between parallel plates and inside a rectangular chamber

Li¹,

Wang²

2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…The LSC impedances are important factors that should be taken into account in the design and operation of modern particle accelerators, especially the ones with low energy and high beam intensities, which are prone to microwave instabilities induced by the LSC fields [1,2]. It is also important for the Free-Electron Lasers (FELs) where the electron's energy is up to a few GeV but its peak current is on the order of kA [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the longitudinal space charge impedance of a round uniform beam inside parallel plates and rectangular chambers

Wang

2015

Phys. Rev. ST Accel. Beams

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This paper analyzes the longitudinal space charge impedances of a round uniform beam inside a rectangular and parallel plate chambers using the image charge method. This analysis is valid for arbitrary wavelengths, and the calculations converge rapidly. The research shows that only a few of the image beams are needed to obtain a relative error less than 0.1%. The beam offset effect is also discussed in the analysis.

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“…The solution of above equations of motion can be written as a summation of two terms [12][13][14][15][16]:…”

Section: Theoretical Model Of Ion Motion In Rf Fieldmentioning

confidence: 99%

“…In previous studies, single particle tracking and analytical model were used to estimate the ion generation and deposition on the cathode of the gun [10][11][12]. Those studies provided useful understanding of ion generation and dynamics inside the gun.…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell/Monte Carlo simulation of ion back bombardment in a high average current RF photo-gun

Qiang¹

2010

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper, we report on study of ion back bombardment in a high average current radio-frequency (RF) photo-gun using a particle-in-cell/Monte Carlo simulation method. Using this method, we systematically studied effects of gas pressure, RF frequency, RF initial phase, electric field profile, magnetic field, laser repetition rate, different ion species on ion particle line density distribution, kinetic energy spectrum, and ion power line density distribution back bombardment onto the photocathode. Those simulation results suggested that effects of ion back bombardment could increase linearly with the background gas pressure and laser repetition rate. The RF frequency has significantly affected the ion motion inside the gun so that the ion power deposition on the photocathode in an RF gun can be several orders of magnitude lower than that in a DC gun. The ion back bombardment can be minimized by appropriately choosing the electric field profile and the initial phase.

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Cathode ion bombardment in rf photoguns

Cited by 4 publications

References 6 publications

Approximate longitudinal space charge impedances of a round beam between parallel plates and inside a rectangular chamber

Approximate longitudinal space charge impedances of a round beam between parallel plates and inside a rectangular chamber

Analysis of the longitudinal space charge impedance of a round uniform beam inside parallel plates and rectangular chambers

Particle-in-cell/Monte Carlo simulation of ion back bombardment in a high average current RF photo-gun

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