303 research outputs found
The Influence of Longitudinal Space Charge Fields on the Modulation Process of Coherent Electron Cooling
The initial modulation in the scheme for Coherent electron Cooling (CeC)
rests on the screening of the ion charge by electrons. However, in a CeC system
with a bunched electron beam, inevitably, a long-range longitudinal space
charge force is introduced. For a relatively dense electron beam, its force can
be comparable to, or even greater than the attractive force from the ions.
Hence, the influence of the space charge field on the modulation process could
be important. If the 3-D Debye lengths are much smaller than the extension of
the electron bunch, the modulation induced by the ion happens locally. Then, in
that case, we can approximate the long-range longitudinal space charge field as
a uniform electric field across the region. As detailed in this paper, we
developed an analytical model to study the dynamics of ion shielding in the
presence of a uniform electric field. We solved the coupled Vlasov-Poisson
equation system for an infinite anisotropic electron plasma, and estimated the
influences of the longitudinal space charge field to the modulation process for
the experimental proof of the CeC principle at RHIC.Comment: 23 pages, 11 figures, single colum
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Effects of incoherent space charge forces on the fast head-tail instability
The effects of incoherent space charge forces on the fast head-tail instability are studied numerically. It is found that incoherent space charge forces can dramatically increase the threshold current for a fixed wall impedance. The algorithm used for this study is described
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The Tranft User's Manual.
The Fortran program TRANFT simulates transverse instabilities in circular accelerators using fast Fourier transform algorithms. It may be used for any particle type. Forces from transverse wakefields, longitudinal wakefields, and transverse detuning wakes are included, with linear transverse space charge forces included as a special case. This note describes the algorithms and their implementation in TRANFT
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