FEL2012 - List of Authors (Litvinenko, V.)

Paper

Title

Page

Growing Modes of the Free-Electron Laser and Their Bandwidth

33

G. Wang, V. Litvinenko
BNL, Upton, Long Island, New York, USA
S.D. Webb
Tech-X, Boulder, Colorado, USA

Forty years after invention of FELs a number of fundamental questions remain unanswered. For example, it is known that for a beam with a Gaussian energy distribution an infinite number of modes exist. But it is unknown how many of these modes are growing, or what frequency cutoffs might exist for these growing modes? In this talk, for the first time, we present the proof that for typical bell-shape energy distribution in the electron beam there is no more that one growing mode - both without [1] and with space charge effects. We also present an analytical expression, which determines the bandwidth of the free-electron laser. Furthermore, we prove that for an energy distribution with N peaks, there is no more than N FEL growing modes. Finally, present a simple method of determining number of growing modes for the case of beam energy distributions with multiple peaks.
[1] On Free-Electron Laser Growing Modes and their Bandwidths, S. Webb, V.N. Litvinenko, G. Wang, Submitted to PR ST-AB

Slides MOOC04 [2.832 MB]

MOPD17

Nonlinear effects in FEL theory and their role in coherent electron cooling

77

A. Elizarov
SUNY SB, Stony Brook, New York, USA
V. Litvinenko
BNL, Upton, Long Island, New York, USA

The novel cooling technique, the coherent electron cooling [1] relies on the amplification of the interaction between hadrons and electrons by an FEL. The linearity of the amplification process is essential for operation of such cooler. In this paper we propose a theoretical method of taking into account nonlinear effects in computation of evolution of charge perturbation in an FEL. This will allow to explore the limits of the FEL gain with special attention to the smearing of the phase caused by nonlinear and saturation effects.
[1] V. N. Litvinenko, Y. S. Derbenev, Phys. Rev. Lett. 102, 114801 (2009).

TUOC02

Start to End Simulations of Optics-free X-ray FEL Oscillator

V. Litvinenko, Y. Hao, Y.C. Jing, D. Kayran, D. Trbojevic
BNL, Upton, Long Island, New York, USA

There is obvious need for an optics-free X-ray FEL oscillator. While self-seeded SASE FELs demonstrated the capability of providing very high gain and short pulses of radiation, the spectra of SASE FELs is still rather wide and can be significantly improved in an FEL-oscillators. Idea of optics-free X-ray FEL oscillator using is know for a decade [1]. In this talk, we present start-to-end simulation of this scheme including both incoherent and coherent SR effects. We discussed the projected performance of this scheme and its potentials limitations.
[1] Optics-Free FEL oscillators, V.N.Litvinenko, ICFA Advanced Accelerator and Beam Dynamics Workshop Chia Laguna, Sardinia, July 1-6, 2002

Slides TUOC02 [2.589 MB]

THPD45

Beam Dynamics and Performance of ERL-driven X-ray FEL

634

Y.C. Jing, V. Litvinenko
BNL, Upton, Long Island, New York, USA

In this talk we present a self-consistent concept of ERL generated e-beam to drive an array of X-ray FELs. We use eRHIC multi-pass ERL design to explore all relevant beam dynamics. First, we study effects of incoherent and coherent synchrotron radiation on the e-beam parameters and present the set of parameters providing for the emittance preservation. Second, we present a sing bunch compressing scheme (similar to scheme described in [1]) with large compression ratio, which suppresses emittance growth caused by CSR. Finally, we present simulation result for soft- and hard-X-ray FELs driven by such electron beam. We compare projected performance of such facility with world's existing and proposed FEL facilities.
[1] Merger Designs for ERLs, V.N. Litvinenko, R.Hajima, D. Kayran, Nuclear Instruments and Methods in Physics Research A 557 (2006) 165

Paper	Title	Page
MOOC04	Growing Modes of the Free-Electron Laser and Their Bandwidth	33
	G. Wang, V. Litvinenko BNL, Upton, Long Island, New York, USA S.D. Webb Tech-X, Boulder, Colorado, USA
	Forty years after invention of FELs a number of fundamental questions remain unanswered. For example, it is known that for a beam with a Gaussian energy distribution an infinite number of modes exist. But it is unknown how many of these modes are growing, or what frequency cutoffs might exist for these growing modes? In this talk, for the first time, we present the proof that for typical bell-shape energy distribution in the electron beam there is no more that one growing mode - both without [1] and with space charge effects. We also present an analytical expression, which determines the bandwidth of the free-electron laser. Furthermore, we prove that for an energy distribution with N peaks, there is no more than N FEL growing modes. Finally, present a simple method of determining number of growing modes for the case of beam energy distributions with multiple peaks. [1] On Free-Electron Laser Growing Modes and their Bandwidths, S. Webb, V.N. Litvinenko, G. Wang, Submitted to PR ST-AB
	Slides MOOC04 [2.832 MB]

MOPD17	Nonlinear effects in FEL theory and their role in coherent electron cooling	77
	A. Elizarov SUNY SB, Stony Brook, New York, USA V. Litvinenko BNL, Upton, Long Island, New York, USA
	The novel cooling technique, the coherent electron cooling [1] relies on the amplification of the interaction between hadrons and electrons by an FEL. The linearity of the amplification process is essential for operation of such cooler. In this paper we propose a theoretical method of taking into account nonlinear effects in computation of evolution of charge perturbation in an FEL. This will allow to explore the limits of the FEL gain with special attention to the smearing of the phase caused by nonlinear and saturation effects. [1] V. N. Litvinenko, Y. S. Derbenev, Phys. Rev. Lett. 102, 114801 (2009).

TUOC02	Start to End Simulations of Optics-free X-ray FEL Oscillator
	V. Litvinenko, Y. Hao, Y.C. Jing, D. Kayran, D. Trbojevic BNL, Upton, Long Island, New York, USA
	There is obvious need for an optics-free X-ray FEL oscillator. While self-seeded SASE FELs demonstrated the capability of providing very high gain and short pulses of radiation, the spectra of SASE FELs is still rather wide and can be significantly improved in an FEL-oscillators. Idea of optics-free X-ray FEL oscillator using is know for a decade [1]. In this talk, we present start-to-end simulation of this scheme including both incoherent and coherent SR effects. We discussed the projected performance of this scheme and its potentials limitations. [1] Optics-Free FEL oscillators, V.N.Litvinenko, ICFA Advanced Accelerator and Beam Dynamics Workshop Chia Laguna, Sardinia, July 1-6, 2002
	Slides TUOC02 [2.589 MB]

THPD45	Beam Dynamics and Performance of ERL-driven X-ray FEL	634
	Y.C. Jing, V. Litvinenko BNL, Upton, Long Island, New York, USA
	In this talk we present a self-consistent concept of ERL generated e-beam to drive an array of X-ray FELs. We use eRHIC multi-pass ERL design to explore all relevant beam dynamics. First, we study effects of incoherent and coherent synchrotron radiation on the e-beam parameters and present the set of parameters providing for the emittance preservation. Second, we present a sing bunch compressing scheme (similar to scheme described in [1]) with large compression ratio, which suppresses emittance growth caused by CSR. Finally, we present simulation result for soft- and hard-X-ray FELs driven by such electron beam. We compare projected performance of such facility with world's existing and proposed FEL facilities. [1] Merger Designs for ERLs, V.N. Litvinenko, R.Hajima, D. Kayran, Nuclear Instruments and Methods in Physics Research A 557 (2006) 165