FEL2011 - List of Authors (Evtushenko, P.)

Paper

Title

Page

Beam Line Commissioning of a UV/VUV FEL at Jefferson Lab

326

S.V. Benson, G.H. Biallas, K. Blackburn, D.B. Bullard, J.L. Coleman, C. Dickover, D. Douglas, F.K. Ellingsworth, P. Evtushenko, C.W. Gould, J.G. Gubeli, D. Hardy, C. Hernandez-Garcia, K. Jordan, J.M. Klopf, J. Kortze, R.A. Legg, M. Marchlik, S.W. Moore, G. Neil, T. Powers, D.W. Sexton, M.D. Shinn, C. Tennant, R.L. Walker, G.P. Williams, F.G. Wilson, S. Zhang
JLAB, Newport News, Virginia, USA
C. Clavero
The College of William and Mary, Williamsburg, USA

Funding: Work supported by U.S. DOE Contract DE-AC05-84-ER40150, Air Force Office of Scientific Research, DOE Basic Energy Sciences, Office of Naval Research, and the Joint Technology Office.
Many novel applications in photon sciences require very high source brightness and/or short pulses in the vacuum ultra-violet (VUV). Jefferson Lab has commissioned a UV oscillator with high gain and has transported the third harmonic of the UV to a user lab. The experimental performance of the UV FEL is much better than simulated performance in both gain and efficiency. This success is important for efforts to push towards higher gain FELs at short wavelengths where mirrors absorb strongly. We will report on efforts to characterize the UV laser and the VUV coherent harmonics as well as designs to lase directly in the VUV wavelength range.

Slides WEOCI1 [3.331 MB]

FROBI1

Electron Beam Diagnostics For High Current FEL Drivers

P. Evtushenko
JLAB, Newport News, Virginia, USA

The application of high current SRF CW accelerators to drive FELs provides dramatic increase in the average photon beam brightness compared to FELs driven by pulsed NC accelerators. At the same time, use of energy recovery allows significant reductions in the required RF power. The JLab IR-Demo and IR-Upgrade demonstrated it in the IR wavelength range. Currently the options to extend this approach to soft X-ray region are under consideration [1]. As high current ERLs give the advantages of running high current and maintaining the linac beam quality they also present the challenges of measuring and understanding the beam dynamics of non-equilibrium beams combined with the requirement to keep average beam losses below the 10^-7 level. Operation of the IR-Upgrade provides demonstration of these challenges. In this talk we share our experience with the machine operation and beam measurements and present our outlook at the possible strategies for beam measurements and tuning in such machines. We argue that the solution to this problem might be to have diagnostics and machine models to measure and understand the phase space distribution with dynamic range of 10⁶ or larger.

Slides FROBI1 [11.279 MB]

Paper	Title	Page
WEOCI1	Beam Line Commissioning of a UV/VUV FEL at Jefferson Lab	326
	S.V. Benson, G.H. Biallas, K. Blackburn, D.B. Bullard, J.L. Coleman, C. Dickover, D. Douglas, F.K. Ellingsworth, P. Evtushenko, C.W. Gould, J.G. Gubeli, D. Hardy, C. Hernandez-Garcia, K. Jordan, J.M. Klopf, J. Kortze, R.A. Legg, M. Marchlik, S.W. Moore, G. Neil, T. Powers, D.W. Sexton, M.D. Shinn, C. Tennant, R.L. Walker, G.P. Williams, F.G. Wilson, S. Zhang JLAB, Newport News, Virginia, USA C. Clavero The College of William and Mary, Williamsburg, USA
	Funding: Work supported by U.S. DOE Contract DE-AC05-84-ER40150, Air Force Office of Scientific Research, DOE Basic Energy Sciences, Office of Naval Research, and the Joint Technology Office. Many novel applications in photon sciences require very high source brightness and/or short pulses in the vacuum ultra-violet (VUV). Jefferson Lab has commissioned a UV oscillator with high gain and has transported the third harmonic of the UV to a user lab. The experimental performance of the UV FEL is much better than simulated performance in both gain and efficiency. This success is important for efforts to push towards higher gain FELs at short wavelengths where mirrors absorb strongly. We will report on efforts to characterize the UV laser and the VUV coherent harmonics as well as designs to lase directly in the VUV wavelength range.
	Slides WEOCI1 [3.331 MB]

FROBI1	Electron Beam Diagnostics For High Current FEL Drivers
	P. Evtushenko JLAB, Newport News, Virginia, USA
	The application of high current SRF CW accelerators to drive FELs provides dramatic increase in the average photon beam brightness compared to FELs driven by pulsed NC accelerators. At the same time, use of energy recovery allows significant reductions in the required RF power. The JLab IR-Demo and IR-Upgrade demonstrated it in the IR wavelength range. Currently the options to extend this approach to soft X-ray region are under consideration [1]. As high current ERLs give the advantages of running high current and maintaining the linac beam quality they also present the challenges of measuring and understanding the beam dynamics of non-equilibrium beams combined with the requirement to keep average beam losses below the 10^-7 level. Operation of the IR-Upgrade provides demonstration of these challenges. In this talk we share our experience with the machine operation and beam measurements and present our outlook at the possible strategies for beam measurements and tuning in such machines. We argue that the solution to this problem might be to have diagnostics and machine models to measure and understand the phase space distribution with dynamic range of 10⁶ or larger.
	Slides FROBI1 [11.279 MB]