FEL2012 - List of Authors (Benson, S.V.)

Paper

Title

Page

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]

THPD11

The JLAB UV Undulator

567

S.C. Gottschalk
STI, Washington, USA
S.V. Benson, W. Moore
JLAB, Newport News, Virginia, USA

Recently the JLAB FEL has demonstrated 150 W at 400 nm and 200 W at 700 nm* using a 33mm period undulator designed and built by STI Optronics. This paper describes the undulator design and performance. Two key requirements were low phase error, zero steering and offset end fields and small rms trajectory errors. We will describe a new genetic algorithm that allowed phase error minimization to 1.8 degrees while exceeding specifications. The mechanical design, control system and EPICS interface will also be summarized.
*S. V. Benson et al., "Beam Line Commissioning of a UV/VUV FEL at Jefferson Lab, presented at the 2011 FEL Conference, Shanghai, China, Aug. 2011

Paper	Title	Page
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]

THPD11	The JLAB UV Undulator	567
	S.C. Gottschalk STI, Washington, USA S.V. Benson, W. Moore JLAB, Newport News, Virginia, USA
	Recently the JLAB FEL has demonstrated 150 W at 400 nm and 200 W at 700 nm* using a 33mm period undulator designed and built by STI Optronics. This paper describes the undulator design and performance. Two key requirements were low phase error, zero steering and offset end fields and small rms trajectory errors. We will describe a new genetic algorithm that allowed phase error minimization to 1.8 degrees while exceeding specifications. The mechanical design, control system and EPICS interface will also be summarized. *S. V. Benson et al., "Beam Line Commissioning of a UV/VUV FEL at Jefferson Lab, presented at the 2011 FEL Conference, Shanghai, China, Aug. 2011