FEL2012 - List of Authors (Boller, K.J.)

Paper	Title	Page
THPD54	Dynamics of a Multi-beam Photonic Free Electron Laser	650
	J.H.H. Lee, K.J. Boller, T. Denis, M.W. van Dijk, P.J.M. van der Slot Mesa+, Enschede, The Netherlands
	A photonic free-electron laser (pFEL) uses free electrons streaming through a photonic crystal (PhC) to generate tunable coherent radiation. Operation in different spectral regions can be obtained by scaling the lattice period while keeping the electron velocity the same. Increasing both the transverse dimension and the number of distributed electron beams increases the output power and results in a higher quality factor Pf2. Here, we consider a pFEL driven by a set of low energy (~ 10 keV), low perveance (< 0.1 μP) electron beams. A simple and robust PhC structure is used to slow down the phase velocity (match to electron velocity) of a co-propagating electromagnetic wave. The large transverse dimensions of the PhC result in an overmoded system, allowing many transverse eigenmodes of the PhC to interact with the electron beams. Using a particle-in-cell code, we numerically study the dynamics and calculate the small-signal growth rate and output power of the various modes. We show that for an appropriate design of the PhC and selective placement of the electron beams, single-mode operation is possible. We will also present results on the scaling with the number of electron beams.

Paper

Title

Page

Dynamics of a Multi-beam Photonic Free Electron Laser

650

J.H.H. Lee, K.J. Boller, T. Denis, M.W. van Dijk, P.J.M. van der Slot
Mesa+, Enschede, The Netherlands

A photonic free-electron laser (pFEL) uses free electrons streaming through a photonic crystal (PhC) to generate tunable coherent radiation. Operation in different spectral regions can be obtained by scaling the lattice period while keeping the electron velocity the same. Increasing both the transverse dimension and the number of distributed electron beams increases the output power and results in a higher quality factor Pf2. Here, we consider a pFEL driven by a set of low energy (~ 10 keV), low perveance (< 0.1 μP) electron beams. A simple and robust PhC structure is used to slow down the phase velocity (match to electron velocity) of a co-propagating electromagnetic wave. The large transverse dimensions of the PhC result in an overmoded system, allowing many transverse eigenmodes of the PhC to interact with the electron beams. Using a particle-in-cell code, we numerically study the dynamics and calculate the small-signal growth rate and output power of the various modes. We show that for an appropriate design of the PhC and selective placement of the electron beams, single-mode operation is possible. We will also present results on the scaling with the number of electron beams.