<i>Theory and Design of Charged Particle Beams</i>

Reiser, M.; Lee, Edward P.

doi:10.1063/1.2808068

Cited by 671 publications

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“…1-3. This makes it feasible to estimate the average emittance growth and to compare with the "free energy" limit derived by Reiser for symmetrically focused beam [11]. The latter is a "2D" approximation understood as the maximum possible rms emittance growth, if all of the energy added to an axially symmetric beam by radial mismatch is "decohered" and a new matched uniform beam is obtained -regardless of the actual driving mechanism.…”

Section: Space-charge Driven Emittance Growthmentioning

confidence: 99%

Space-Charge Driven Emittance Growth in a 3D Mismatched Anisotropic Beam

2004

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In this paper we present a 3D simulation study of the emittance growth in a mismatched anisotropic beam. The equipartitioning driven by a 4th order space-charge resonance can be significantly modified by the presenc of mismatch oscillation and halo formation. This causes emittance growth in both the longitudinal and transverse directions which could drive the beam even further away from equipartition. The averaged emittance growth per degree of freedom follows the upper bound of the 2D free energy limit plus the contributions from eqipartitioning.

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Section: Space-charge Driven Emittance Growthmentioning

confidence: 99%

Space-Charge Driven Emittance Growth in a 3D Mismatched Anisotropic Beam

2004

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“…(Note that we have implicltly assumed that the timescale for complete equipartition [AZ" = Ay12 = A(6p/p0)~] is much larger than timescales of interest ) The condition that Ad2 = Ay" can be expressed as a relation between Ay2 and At2. (16) When kpnz = kpay = kpo and AZ& << Ax2 this result reduces to.…”

Section: Modelmentioning

confidence: 93%

Emittance growth in heavy ion rings due to the effects of space charge and dispersion

Barnard¹,

Craig²,

Friedman³

et al. 1998

AIP Conference Proceedings

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We review the derivation of moment equations which include the effects of space charge and dispersion in bends first presented in ref [l] These equations generahze the famihar envelope equations to mclude the dispersive effects of bends TTe review the application of these equations to the calculation of the change m emrttance resulting from a sharp transition from a straight section to a bend section, usmg an energy conservation constramtComparisons of detailed 2D and 3D snnulatrons of intense beams m rmgs using the WARP code (refs [2;3]) are made with results obtamed from the moment equationsWe also compare the analysis carried out in ref [I], to more recent analyses, refs [4,5] We further exammr self-consistent distributions of beams m bends and discuss the relevance of these distributions to the moment equation formulation

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“…In the current study of the ion back bombardment inside this RF photo-gun, we have assumed a group of nominal parameters listed in the following table: We have used the energy dependent electron impact ionization cross section for residual H 2 gas, H 2 O gas and CH 4 gas that are commonly observed in most RF photo-guns [10,19]. Figure 1 shows the electron impact ionization cross section for those three species gases [20][21][22]. It is seen that the ionization cross section reaches the maximum value around 50 eV of electron kinetic energy and falls off quickly after 100 eV for all three species of gas.…”

Section: Simulation Of Ion Back Bombardment In the Vhf Rf Gunmentioning

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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Theory and Design of Charged Particle Beams

Cited by 671 publications

References 0 publications

Space-Charge Driven Emittance Growth in a 3D Mismatched Anisotropic Beam

Space-Charge Driven Emittance Growth in a 3D Mismatched Anisotropic Beam

Emittance growth in heavy ion rings due to the effects of space charge and dispersion

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

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