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Karssenberg, J. G.

Paper Title Page
TUPPH001 A 3D Model of the 4GLS VUV-FEL Conceptual Design Including Improved Modelling of the Optical Cavity 304
 
  • N. Thompson, D. J. Dunning
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • K.-J. Boller, J. G. Karssenberg, P. J.M. van der Slot
    Twente University, Laser Physics and Non-Linear Optics Group, Enschede
  • B. W.J. McNeil
    USTRAT/SUPA, Glasgow
  
  The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. The proposal includes a low-Q cavity (also called a regenerative amplifier) FEL to generate variably-polarised, temporally-coherent radiation in the photon energy range 3-10eV. A new simulation code has been developed that incorporates the 3D FEL code Genesis 1.3 and which simulates in 3D the optical components and radiation propagation within the non-amplifying sections of an optical cavity*. This code is used to estimate the optimum low-Q cavity design and characterise the output from the 4GLS VUV-FEL.

* J. G. Karstenberg, P. J.M. van der Slot, J. W.J. Verschuur, I. V. Volohkin, K.-J. Boller (ibid)

 
TUPPH037 FEL-Oscillator Simulations with Genesis 1.3 407
 
  • J. G. Karssenberg, K.-J. Boller, J. W.J. Verschuur, P. J.M. van der Slot
    Twente University, Laser Physics and Non-Linear Optics Group, Enschede
  • I. Volokhine
    Philips Research, Eindhoven
  
  We present a paraxial optical propagation code (OPC) as an extension to Genesis 1.3* for the theoretical description of FELs with an optical resonator. The OPC receives the optical output from a Genesis simulation, propagates it once through the resonator, and applies the result as the optical input pulse for a next run of Genesis. The OPC allows both the description of time dependent and steady state FEL operation. The propagation algorithms available are the Spectral algorithm, the Fresnel algorithm and a modified Fresnel algorithm. The latter enables a fast modelling of feedback via complex resonator designs that may include hard-edge elements (apertures) or hole-coupled mirrors with arbitrary shapes. The code enables to predict the output at each of the various optical elements which is of advantage for beam diagnostics and for designing suitable optics for a further propagation of the output beam. Finally, the OPC can be used to determine the far field output in connection with any Genesis 1.3 simulation, be it an oscillator or an amplifier FEL. As a test of the combined OPC and Genesis 1.3 codes we found good agreement with experimental data available for FELIX**.

* http://pbpl.physics.ucla.edu/~reiche/index.html** B. Faatz, Ph. D. Thesis, Nieuwegein, The Netherlands 1992.