FEL2012 - List of Authors (van der Slot, P.J.M.)

Paper

Title

Page

The CSU Accelerator and FEL Facility

373

S.V. Milton, S. Biedron, T.A. Burleson, C. Carrico, J.P. Edelen, C.C. Hall, K. Horovitz, A.L. Morin, L. Rand, N. Sipahi, T. Sipahi, P.J.M. van der Slot
CSU, Fort Collins, Colorado, USA
A. Dong
University of Illinois, Urbana, Illinois, USA
H. Yehudah
Morgan Park Academy, Chicago, Illinois, USA

The Department of Electrical and Computer Engineering recently received a donation of an L-band photocathode-gun and RF linear accelerator system from the University of Twente, the Netherlands. This system will be used for training and research and development of beam components. A description of the system configuration, estimated build-up schedule, and first experiments will be described.

TUOC05

A New Approach to Improving the Efficiency of FEL Oscillator Simulations

225

M.D. Shinn, S.V. Benson, A.M. Watson
JLAB, Newport News, Virginia, USA
H.P. Freund, D.C. Nguyen
LANL, Los Alamos, New Mexico, USA
P.J.M. van der Slot
Mesa+, Enschede, The Netherlands

Funding: This work was supported by the Commonwealth of Virginia and U.S. DOE Contract No. DE-AC05-84-ER40150.
During the last year we have been benchmarking FEL oscillator simulation codes against the measured performance of the three Jefferson Lab oscillator FELs. While one might think that a full 4D simulation is de facto the best predictor of performance, the simulations are computationally intensive, even when analytical approximations to the electron bunch longitudinal distribution are used. In this presentation we compare the predictions of the 4D FEL interaction codes Genesis and Medusa, in combination with the optical code OPC, with those using a combination of the 2D & 3D versions of these codes, which can be run quickly on a single CPU core desktop computer.

Slides TUOC05 [0.351 MB]

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
WEPD03	The CSU Accelerator and FEL Facility	373
	S.V. Milton, S. Biedron, T.A. Burleson, C. Carrico, J.P. Edelen, C.C. Hall, K. Horovitz, A.L. Morin, L. Rand, N. Sipahi, T. Sipahi, P.J.M. van der Slot CSU, Fort Collins, Colorado, USA A. Dong University of Illinois, Urbana, Illinois, USA H. Yehudah Morgan Park Academy, Chicago, Illinois, USA
	The Department of Electrical and Computer Engineering recently received a donation of an L-band photocathode-gun and RF linear accelerator system from the University of Twente, the Netherlands. This system will be used for training and research and development of beam components. A description of the system configuration, estimated build-up schedule, and first experiments will be described.

TUOC05	A New Approach to Improving the Efficiency of FEL Oscillator Simulations	225
	M.D. Shinn, S.V. Benson, A.M. Watson JLAB, Newport News, Virginia, USA H.P. Freund, D.C. Nguyen LANL, Los Alamos, New Mexico, USA P.J.M. van der Slot Mesa+, Enschede, The Netherlands
	Funding: This work was supported by the Commonwealth of Virginia and U.S. DOE Contract No. DE-AC05-84-ER40150. During the last year we have been benchmarking FEL oscillator simulation codes against the measured performance of the three Jefferson Lab oscillator FELs. While one might think that a full 4D simulation is de facto the best predictor of performance, the simulations are computationally intensive, even when analytical approximations to the electron bunch longitudinal distribution are used. In this presentation we compare the predictions of the 4D FEL interaction codes Genesis and Medusa, in combination with the optical code OPC, with those using a combination of the 2D & 3D versions of these codes, which can be run quickly on a single CPU core desktop computer.
	Slides TUOC05 [0.351 MB]

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.