Abstract
Using a 1D steady-state free-space coherent synchrotron radiation (CSR) model, we identify a special design setting for a triple-bend isochronous achromat that yields vanishing emittance growth from CSR. When a more refined CSR model with transient effects is included in the analysis, numerical simulations show that the main effect of the transients is to shift the emittance growth minimum slightly, with the minimum changing only modestly.
Highlights
It is desirable for acceleration and transport of highbrightness electron bunches to occur without degradation of the beam quality
In single-pass systems for free electron lasers (FELs) dipole magnets are required for bunch compression and often to distribute the electrons to off-axis beamlines
We show that within the approximation of the model it is possible to specify a lattice design that yields vanishing coherent synchrotron radiation (CSR)-induced emittance growth
Summary
It is desirable for acceleration and transport of highbrightness electron bunches to occur without degradation of the beam quality. As the electrons in a bunch travel through a bend, synchrotron radiation at the low end of the frequency spectrum is emitted coherently, perturbing the particle energy, inducing transverse offsets both in the spacial and angular coordinates, and causing projected emittance growth. In single-pass systems for free electron lasers (FELs) dipole magnets are required for bunch compression and often to distribute the electrons to off-axis beamlines. In multipass systems, such as energy recovery linacs, bending is integral to the machine topology. We consider the problem of minimizing CSR effects on the transverse emittance in a triple-bend isochronous achromat, a lattice unit widely used in accelerator design.
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