PAC2013 - List of Authors (Bosch, R.A.)

Paper	Title	Page
MOPHO26	Laser-undulator FEL with Nearly Copropagating Laser Pulse	294
	R.A. Bosch, J. Bisognano, M.A. Green, K. Jacobs, R. Wehlitz UW-Madison/SRC, Madison, Wisconsin, USA T.-C. Chiang, T.J. Miller University of Illinois, Urbana, USA J.E. Lawler, D. Yavuz UW-Madison/PD, Madison, Wisconsin, USA R.C. York FRIB, East Lansing, Michigan, USA
	A free-electron laser (FEL) may be obtained by interaction of an electron bunch and a nearly copropagating laser pulse, where the laser pulse is sheared to extend the interaction length. When the angle between the electron beam axis and the propagation direction of the laser pulse greatly exceeds the reciprocal of the relativistic factor, the output radiation is nearly on the axis, and the FEL may be approximated by an axially aligned magnetostatic undulator. For a feasible laser-undulator FEL, we calculate gain using a one-dimensional model, as well as a three-dimensional model that includes degradation from diffraction and electron velocity spread.

TUPMA19	Wisconsin SRF Electron Gun Commissioning	622
	J. Bisognano, M.J. Bissen, R.A. Bosch, M.Y. Efremov, D. Eisert, M.V. Fisher, M.A. Green, K. Jacobs, R.G. Keil, K.J. Kleman, G.C. Rogers, M.C. Severson, D. Yavuz UW-Madison/SRC, Madison, Wisconsin, USA R. Bachimanchi, C. Hovater, R.A. Legg, T. E. Plawski, T. Powers JLAB, Newport News, Virginia, USA
	Funding: Work supported by DOE Award #DE-SC0005264 and the University of Wisconsin The University of Wisconsin has completed fabrication and commissioning of a low frequency (199.6 MHz) superconducting electron gun based on a quarter wave resonator (QWR) cavity. Its concept was optimized to be the source for a CW free electron laser facility. The gun design includes active tuning and a high temperature superconducting solenoid. We will report on the status of the Wisconsin SRF electron gun program, including commissioning experience and first beam measurements.

TUPMA20	Effect of RF Gradient upon the Performance of the Wisconsin SRF Electron Gun	625
	R.A. Bosch UW-Madison/SRC, Madison, Wisconsin, USA R.A. Legg JLAB, Newport News, Virginia, USA
	The performance of the Wisconsin 200-MHz SRF electron gun is simulated for several values of the RF gradient. Bunches with charge of 200 pC are modeled for the case where emittance compensation is completed during post-acceleration to 85 MeV in a TESLA module. We first perform simulations in which the initial bunch radius is optimal for the design gradient of 41 MV/m. We then optimize the radius as a function of RF gradient to improve the performance for low gradients.

Paper

Title

Page

Laser-undulator FEL with Nearly Copropagating Laser Pulse

294

R.A. Bosch, J. Bisognano, M.A. Green, K. Jacobs, R. Wehlitz
UW-Madison/SRC, Madison, Wisconsin, USA
T.-C. Chiang, T.J. Miller
University of Illinois, Urbana, USA
J.E. Lawler, D. Yavuz
UW-Madison/PD, Madison, Wisconsin, USA
R.C. York
FRIB, East Lansing, Michigan, USA

A free-electron laser (FEL) may be obtained by interaction of an electron bunch and a nearly copropagating laser pulse, where the laser pulse is sheared to extend the interaction length. When the angle between the electron beam axis and the propagation direction of the laser pulse greatly exceeds the reciprocal of the relativistic factor, the output radiation is nearly on the axis, and the FEL may be approximated by an axially aligned magnetostatic undulator. For a feasible laser-undulator FEL, we calculate gain using a one-dimensional model, as well as a three-dimensional model that includes degradation from diffraction and electron velocity spread.

TUPMA19

Wisconsin SRF Electron Gun Commissioning

622

J. Bisognano, M.J. Bissen, R.A. Bosch, M.Y. Efremov, D. Eisert, M.V. Fisher, M.A. Green, K. Jacobs, R.G. Keil, K.J. Kleman, G.C. Rogers, M.C. Severson, D. Yavuz
UW-Madison/SRC, Madison, Wisconsin, USA
R. Bachimanchi, C. Hovater, R.A. Legg, T. E. Plawski, T. Powers
JLAB, Newport News, Virginia, USA

Funding: Work supported by DOE Award #DE-SC0005264 and the University of Wisconsin
The University of Wisconsin has completed fabrication and commissioning of a low frequency (199.6 MHz) superconducting electron gun based on a quarter wave resonator (QWR) cavity. Its concept was optimized to be the source for a CW free electron laser facility. The gun design includes active tuning and a high temperature superconducting solenoid. We will report on the status of the Wisconsin SRF electron gun program, including commissioning experience and first beam measurements.

TUPMA20

Effect of RF Gradient upon the Performance of the Wisconsin SRF Electron Gun

625

R.A. Bosch
UW-Madison/SRC, Madison, Wisconsin, USA
R.A. Legg
JLAB, Newport News, Virginia, USA

The performance of the Wisconsin 200-MHz SRF electron gun is simulated for several values of the RF gradient. Bunches with charge of 200 pC are modeled for the case where emittance compensation is completed during post-acceleration to 85 MeV in a TESLA module. We first perform simulations in which the initial bunch radius is optimal for the design gradient of 41 MV/m. We then optimize the radius as a function of RF gradient to improve the performance for low gradients.