| Paper | Title | Page |
|---|---|---|
| MOPC16 | Numerical FEL Studies with a new Code Alice | 71 |
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We present a fully three dimensional time-domain simulation code for free-electron lasers. Compared to the existing codes, we have implemented different numerical schemes for tracking and field calculations. The equations of motion of the particles are integrated with a leap-frog scheme. The parabolic field equation is resolved with implicit Neumann finite difference scheme based on azimuthal expansion. Additionally we have implemented the open boundary condition with the help of perfectly matched layer for parabolic equation. The last feature allows for a mesh only in the bunch vicinity. The implemented field solver is accurate and fast. We test the accuracy of the code with different numerical tests and apply the code to estimate the expected properties of the radiation in FLASH facility with 3rd harmonic module. |
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| WEPC45 | Numerical Performance Studies on the new Sliced-Beam-Parameter Measurement Section for FLASH | 599 |
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The free-electron laser (FEL) user facility FLASH at DESY operates a high-gain FEL and provides radiation in the vacuum-ultraviolet and soft X-ray regime. In order to improve the capability and performance of the facility, FLASH will be upgraded with a third-harmonic (3.9 GHz) RF system to linearise the longitudinal phase space in front of the bunch compressors. For the study of the phase space linearisation, a new diagnostic and matching section located directly in front of the undulators which are used for the generation of SASE (self-amplified spontaneous emission) was designed. This section makes it possible to determine sliced beam parameters with high longitudinal resolution. In this paper, we describe the design considerations for this diagnostic section and demonstrate the expected performance by means of particle tracking simulations. |