FEL2011 - List of Keywords (wiggler)

Paper	Title	Other Keywords	Page
MOPC01	Compact THz Radiation Source Based on a Photocathode RF Gun	electron, laser, gun, FEL	92
	S. Liu Shanghai Jiao Tong University, Shanghai, People's Republic of China J. Urakawa KEK, Ibaraki, Japan
	Terahertz (THz) science and technology have already become the research highlight at present. In this paper, we put forward a proposal to generate THz radiation at tens of MW peak power. Due to the ultrafast laser and the high accelerating field of photocathode RF gun, we can generate and accelerate electron beam to several MeV, of which the bunch length is less than sub-ps. When the short electron bunches are injected into the wiggler, THz radiation based on Coherent Synchrotron Radiation could be achieved with tens of MW peak power. The whole THz FEL facility can be scaled to the size of a tabletop.

MOPC21	Comparison of Growth Rates of Two-Stream Free Electron Lasers (TSFEL) with Planar Wiggler Magnet and AC Electrical Wiggler Pumps	electron, FEL, laser, free-electron-laser	136
	N. Mahdizadeh Islamic Azad University, Sabzevar Branch, Sabzevar, Iran F.M. Aghamir University of Tehran, Tehran, Iran
	Funding: Sabzevar Branch, Islamic Azad University A Comparison between growth rates of a Two Stream Free Electron Laser (TSFEL) with a planar wiggler pump and ac electrical wiggler pump has been presented. With the aid of fluid theory, dispersion relations are derived and their characteristics have been numerically analyzed. In this analysis, the longitudinal component of the stress tensor has been retained for beam temperature consideration. Similarities and differences in dispersion relations and growth rate have, also, been presented.

MOPC22	Nonlinear Analyses in Two-stream Free-Electron Laser with Helical Wiggler Pump	electron, radiation, FEL, free-electron-laser	138
	N. Mahdizadeh Islamic Azad University, Sabzevar Branch, Sabzevar, Iran F.M. Aghamir University of Tehran, Tehran, Iran A. Raghavi PNUM, Mashhad, Iran
	Funding: Sabzevar Branch, Islamic Azad University The analysis of a Two-Stream Free Electron Laser (TSFEL) with a helical wiggler pump is presented. The power and the signal growth rate are calculated. A set of coupled nonlinear differential equations for slowly varying amplitudes and phases is obtained through the substitution of vector and scalar potentials into the Maxwell-Poisson equations. The electron orbit equations are derived by Lorentz force equation. The obtained equations for fields and ensemble of electrons are solved numerically. The power and growth rate of TSFEL are compared with those of conventional FEL. It has been found that the TSFEL reaches the saturation regime in a longer axial distance in comparison to the conventional FEL and the growth rate of the TSFEL is somewhat lower than conventional FEL.

MOPC27	Small Signal Gain for Two Stream FEL	electron, FEL, resonance, free-electron-laser	141
	A. Raghavi PNUM, Mashhad, Iran N. Mahdizadeh Islamic Azad University, Sabzevar Branch, Sabzevar, Iran
	The problem of wave-particle interaction in the small signal gain regime for the tow-stream free electron laser is considered using a relativistic moving frame. The equation of motion in this frame is solved by means of a non-relativistic Hamiltonian. Small signal gain (SSG) for the laser is derived in both moving and laboratory frames.

WEOA3	Proof-of-principle Experiment for FEL-based Coherent Electron Cooling	electron, FEL, ion, hadron	322
	V. Litvinenko, S.A. Belomestnykh, I. Ben-Zvi, J.C. Brutus, A.V. Fedotov, Y. Hao, D. Kayran, G.J. Mahler, A. Marusic, G.T. McIntyre, W. Meng, M.G. Minty, I. Pinayev, V. Ptitsyn, T. Rao, T. Roser, B. Sheehy, S. Tepikian, R. Than, D. Trbojevic, J.E. Tuozzolo, G. Wang, V. Yakimenko BNL, Upton, Long Island, New York, USA D.T. Abell, G.I. Bell, D.L. Bruhwiler, C. Nieter, V.H. Ranjbar, B.T. Schwartz Tech-X, Boulder, Colorado, USA A. Hutton, G.A. Krafft, M. Poelker, R.A. Rimmer JLAB, Newport News, Virginia, USA M.A. Kholopov, O.A. Shevchenko, P. Vobly BINP SB RAS, Novosibirsk, Russia P.A. McIntosh, A.E. Wheelhouse STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Coherent electron cooling (CEC) has a potential to significantly boost luminosity of high-energy, high-intensity hadron-hadron and electron-hadron colliders [1]. In a CEC system, a hadron beam interacts with a cooling electron beam. A perturbation of the electron density caused by ions is amplified and fed back to the ions to reduce the energy spread and the emittance of the ion beam. To demonstrate the feasibility of CEC we propose a proof-of-principle experiment at RHIC using one of JLab’s SRF cryo-modules. In this paper, we describe the experimental setup for CeC installed into one of RHIC's interaction regions. We present results of analytical estimates and results of initial simulations of cooling a gold-ion beam at 40 GeV/u energy via CeC. [1] Vladimir N. Litvinenko, Yaroslav S. Derbenev, Physical Review Letters 102, 114801
	Slides WEOA3 [3.568 MB]

WEPB22	An Optical Streaking Method for Measuring Femtosecond Electron Bunches	laser, electron, FEL, background	431
	Y.T. Ding, K.L.F. Bane, Z. Huang SLAC, Menlo Park, California, USA
	The measurement of the ultra-short electron bunch on the femotosecond time scale constitutes a very challenging problem. In the X-ray free electron laser facilities such as the Linac Coherent Light Source (LCLS), generation of a sub-ten femtoseconds electron beam at low charge operation mode is possible, based on indirect measurements and computer simulations. Direct measurements are not available due to the resolution limit of the present diagnostics. We propose a new method based on the energy modulation of the ultra-short electron bunch by interacting with an optical laser in a short wiggler. Compared with a laser-based transverse deflector, which requires the laser wavelength much longer than the electron bunch length, here we propose a scheme to use a laser with its wavelength shorter than the electron bunch length, where the slope on the laser intensity envelope has been used to help distinguish the different periods. The calibration is simple and it is possible to reconstruct the bunch longitudinal profile from a single shot measurement.

Paper

Title

Other Keywords

Page

MOPC01

Compact THz Radiation Source Based on a Photocathode RF Gun

electron, laser, gun, FEL

92

S. Liu
Shanghai Jiao Tong University, Shanghai, People's Republic of China
J. Urakawa
KEK, Ibaraki, Japan

Terahertz (THz) science and technology have already become the research highlight at present. In this paper, we put forward a proposal to generate THz radiation at tens of MW peak power. Due to the ultrafast laser and the high accelerating field of photocathode RF gun, we can generate and accelerate electron beam to several MeV, of which the bunch length is less than sub-ps. When the short electron bunches are injected into the wiggler, THz radiation based on Coherent Synchrotron Radiation could be achieved with tens of MW peak power. The whole THz FEL facility can be scaled to the size of a tabletop.

MOPC21

Comparison of Growth Rates of Two-Stream Free Electron Lasers (TSFEL) with Planar Wiggler Magnet and AC Electrical Wiggler Pumps

electron, FEL, laser, free-electron-laser

136

N. Mahdizadeh
Islamic Azad University, Sabzevar Branch, Sabzevar, Iran
F.M. Aghamir
University of Tehran, Tehran, Iran

Funding: Sabzevar Branch, Islamic Azad University
A Comparison between growth rates of a Two Stream Free Electron Laser (TSFEL) with a planar wiggler pump and ac electrical wiggler pump has been presented. With the aid of fluid theory, dispersion relations are derived and their characteristics have been numerically analyzed. In this analysis, the longitudinal component of the stress tensor has been retained for beam temperature consideration. Similarities and differences in dispersion relations and growth rate have, also, been presented.

MOPC22

Nonlinear Analyses in Two-stream Free-Electron Laser with Helical Wiggler Pump

electron, radiation, FEL, free-electron-laser

138

N. Mahdizadeh
Islamic Azad University, Sabzevar Branch, Sabzevar, Iran
F.M. Aghamir
University of Tehran, Tehran, Iran
A. Raghavi
PNUM, Mashhad, Iran

Funding: Sabzevar Branch, Islamic Azad University
The analysis of a Two-Stream Free Electron Laser (TSFEL) with a helical wiggler pump is presented. The power and the signal growth rate are calculated. A set of coupled nonlinear differential equations for slowly varying amplitudes and phases is obtained through the substitution of vector and scalar potentials into the Maxwell-Poisson equations. The electron orbit equations are derived by Lorentz force equation. The obtained equations for fields and ensemble of electrons are solved numerically. The power and growth rate of TSFEL are compared with those of conventional FEL. It has been found that the TSFEL reaches the saturation regime in a longer axial distance in comparison to the conventional FEL and the growth rate of the TSFEL is somewhat lower than conventional FEL.

MOPC27

Small Signal Gain for Two Stream FEL

electron, FEL, resonance, free-electron-laser

141

A. Raghavi
PNUM, Mashhad, Iran
N. Mahdizadeh
Islamic Azad University, Sabzevar Branch, Sabzevar, Iran

The problem of wave-particle interaction in the small signal gain regime for the tow-stream free electron laser is considered using a relativistic moving frame. The equation of motion in this frame is solved by means of a non-relativistic Hamiltonian. Small signal gain (SSG) for the laser is derived in both moving and laboratory frames.

WEOA3

Proof-of-principle Experiment for FEL-based Coherent Electron Cooling

electron, FEL, ion, hadron

322

V. Litvinenko, S.A. Belomestnykh, I. Ben-Zvi, J.C. Brutus, A.V. Fedotov, Y. Hao, D. Kayran, G.J. Mahler, A. Marusic, G.T. McIntyre, W. Meng, M.G. Minty, I. Pinayev, V. Ptitsyn, T. Rao, T. Roser, B. Sheehy, S. Tepikian, R. Than, D. Trbojevic, J.E. Tuozzolo, G. Wang, V. Yakimenko
BNL, Upton, Long Island, New York, USA
D.T. Abell, G.I. Bell, D.L. Bruhwiler, C. Nieter, V.H. Ranjbar, B.T. Schwartz
Tech-X, Boulder, Colorado, USA
A. Hutton, G.A. Krafft, M. Poelker, R.A. Rimmer
JLAB, Newport News, Virginia, USA
M.A. Kholopov, O.A. Shevchenko, P. Vobly
BINP SB RAS, Novosibirsk, Russia
P.A. McIntosh, A.E. Wheelhouse
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Coherent electron cooling (CEC) has a potential to significantly boost luminosity of high-energy, high-intensity hadron-hadron and electron-hadron colliders [1]. In a CEC system, a hadron beam interacts with a cooling electron beam. A perturbation of the electron density caused by ions is amplified and fed back to the ions to reduce the energy spread and the emittance of the ion beam. To demonstrate the feasibility of CEC we propose a proof-of-principle experiment at RHIC using one of JLab’s SRF cryo-modules. In this paper, we describe the experimental setup for CeC installed into one of RHIC's interaction regions. We present results of analytical estimates and results of initial simulations of cooling a gold-ion beam at 40 GeV/u energy via CeC.
[1] Vladimir N. Litvinenko, Yaroslav S. Derbenev, Physical Review Letters 102, 114801

Slides WEOA3 [3.568 MB]

WEPB22

An Optical Streaking Method for Measuring Femtosecond Electron Bunches

laser, electron, FEL, background

431

Y.T. Ding, K.L.F. Bane, Z. Huang
SLAC, Menlo Park, California, USA

The measurement of the ultra-short electron bunch on the femotosecond time scale constitutes a very challenging problem. In the X-ray free electron laser facilities such as the Linac Coherent Light Source (LCLS), generation of a sub-ten femtoseconds electron beam at low charge operation mode is possible, based on indirect measurements and computer simulations. Direct measurements are not available due to the resolution limit of the present diagnostics. We propose a new method based on the energy modulation of the ultra-short electron bunch by interacting with an optical laser in a short wiggler. Compared with a laser-based transverse deflector, which requires the laser wavelength much longer than the electron bunch length, here we propose a scheme to use a laser with its wavelength shorter than the electron bunch length, where the slope on the laser intensity envelope has been used to help distinguish the different periods. The calibration is simple and it is possible to reconstruct the bunch longitudinal profile from a single shot measurement.