RUPAC2012 - List of Keywords (FEL)

Paper	Title	Other Keywords	Page
MOXCH04	Laser-Plasma Acceleration – Towards a Compact X-ray Light Source and FEL	laser, plasma, acceleration, electron	9
	A. Seryi JAI, Oxford, United Kingdom
	Funding: The work is supported in part by UK STFC JAI grant ST/G008531. Advances in many scientific and technical fields depend on availability of instruments, which can probe the structure of materials or molecules on unprecedented levels of spatial or temporal resolution. Many of such instruments are based on accelerators of charged particles, with particular examples of synchrotron radiation light sources and coherent X-ray Free Electron Lasers. The high cost of such facilities, however, preclude wide spread of such instruments. Modern accelerator science witnesses emergence of a new direction – compact x-ray sources are coming to the scene, enabled by the synergy of accelerators and lasers, where high gradient laser-plasma acceleration can significantly reduce the size and cost of the facilities. Compact x-ray sources will be developed in the nearest future and will share their scientific and market niche with large national scale x-ray facilities. The compact sources will in particular be suitable for placement in universities and medical or technological centres. The compact x-ray light sources are being developed by many centres in UK. Development of compact x-ray FEL is a promising topic for scientific and technological collaboration between UK and Russia, where expertise of partners will cross-fertilize their ability to solve scientific and technological challenges.
	Slides MOXCH04 [12.555 MB]

THXCH03	Current FEL Physics Research at SLAC	laser, electron, undulator, radiation	131
	G.V. Stupakov SLAC, Menlo Park, California, USA
	Funding: Work is supported by Department of Energy contract DE-AC02-76SF00515 SLAC is a home of the first hard x-ray free electron laser - the Linac Coherent Light Source, or LCLS, based on Self-Amplified Stimulated Emission (SASE) principle. Being a user facility, LCLS, as well as some other installations at SLAC, are, at the same time, test beds of research aimed to improving fundamental characteristics of free electron lasers. In this presentation I will review results of some of these studies. They include studies of the FEL seeding based on the Echo-Enabled Harmonic Generation (EEGH) carried out at the NLCTA facility at SLAC, hard x-ray self seeding at LCLS, noise suppression experiments, and research aimed to achieve terawatt-scale power in FELs. A brief review of the plans for LCLS upgrade will be given.
	Slides THXCH03 [10.105 MB]

THXCH04	Budker INP Free Electron Laser Facility – Current Status and Future Prospects	undulator, electron, radiation, linac	136
	O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, E.I. Gorniker, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, L.A. Mironenko, V.K. Ovchar, B.Z. Persov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, G.V. Serdobintsev, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, N. Vinokurov, M.G. Vlasenko, P. Vobly, V. Volkov BINP SB RAS, Novosibirsk, Russia
	The free electron laser (FEL) facility at Budker INP is being developed for more than 15 years. It is based on the normal conducting CW energy recovery linac (ERL) with rather complicated magnetic system lattice. Up to now it is the only one in the world multiorbit ERL. It can operate in three different regimes providing electron beam for three different FELs. Its commissioning was naturally divided in three stages. The first stage ERL includes only one orbit placed in vertical plane. It serves as electron beam source for terahertz FEL which started working for users in 2003. Radiation of this FEL is used by several groups of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized in experiments on material ablation and biological objects modification. The second stage ERL is composed of two orbits located in horizontal plane. The second stage FEL is installed on the bypass of the second orbit. The first lasing of this FEL was achieved in 2009. The last stage ERL will include four orbits. Its commissioning is in progress now. In this paper we report the latest results obtained from the operating FELs as well as our progress with the commissioning of the two remaining ERL beamlines. We also discuss possible options for the future upgrade.
	Slides THXCH04 [5.360 MB]

TUPPB050	The System of Power Supplies, Control and Modulation of Electron Gun for Free Electron Laser	controls, electron, cathode, free-electron-laser	427
	V.K. Ovchar, V.R. Kozak, E.A. Kuper, V.R. Mamkin, V.V. Repkov, S.S. Serednyakov, S.V. Tararyshkin, D.A. Zverev BINP SB RAS, Novosibirsk, Russia
	The system of power supplies, control and modulation based on triode cathode-grid unit was designed for producing of pulsed electron beam for free electron laser FEL The main part of the system located inside the tank filled with SF6 gas and has -300 kV potential. It's supplied through the isolated transformer and controlled through the fiber optic link with CAN interface. The GaN RF transistor in the output stage of modulator composed of hybrid assembly on the BeO ceramic plate. Pulsed output voltage of modulator can be regulated 0-120 V on the load 25 Ohm. Time duration is <1 ns. Repetition rate is 0-90 MHz. Start of modulator from timer performed through the 1GHz fiber optic link. The control code was written on C++ language under Windows operating system using QT framework.

TUPPB052	A ps-Pulsed E-gun Advanced to a T-wave Source of MW-level Peak Power	laser, electron, cathode, radiation	430
	A.V. Smirnov RadiaBeam, Santa Monica, USA
	Funding: Department of Energy A coherent source based on a electron gun is considered to deliver high instantaneous power comparable to that available from just a few other non-FEL and most FEL sources at mm-submillimeter wavelengths. A DC or RF E-gun is integrated with a robust, compact, efficient, dismountable radiator inside the vacuum envelope. Wakefield radiator is driven by a low-energy photoinjector operated in a custom mode combining strong over-focusing, robust slow-wave structure, and pulse sub-ps photoinjectior employing on-cathode beam modulation with conventional optical multiplexing. Single pulse mode operation is enhanced with filed compression effect at high group velocity. The performance is analyzed analytically and numerically supported by experimental data on beam overfocusing. Radiation outcoupling is analyzed as well.

WEPPD003	Diagnostic Technique with Femtosecond Resolution Applied for FEL Electron Bunches	radiation, electron, undulator, photon	572
	E. Syresin, A.Yu. Grebentsov, R.S. Makarov, N.A. Morozov, M.V. Yurkov JINR, Dubna, Moscow Region, Russia O.I. Brovko, A.V. Shabunov JINR/VBLHEP, Moscow, Russia
	Diagnostic technique applied for FEL ultrashort electron bunches is developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort electron bunches are based on calorimetric measurements and detection of undulator radiation. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The pump probe experiments with VUV and FIR undulators provide the bunch profile measurements with resolution of several femtosecond. The MCP based radiation detectors are effectively used at FLASH for VUV pulse energy measurements. The new three MCP detectors operated in X-ray range are under development now in JINR for SASE1-SASE 3 XFEL.

WEPPD013	Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery	electron, cavity, linac, photon	593
	V.G. Kurakin, P.V. Kurakin LPI, Moscow, Russia
	In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.

Paper

Title

Other Keywords

Page

MOXCH04

Laser-Plasma Acceleration – Towards a Compact X-ray Light Source and FEL

laser, plasma, acceleration, electron

9

A. Seryi
JAI, Oxford, United Kingdom

Funding: The work is supported in part by UK STFC JAI grant ST/G008531.
Advances in many scientific and technical fields depend on availability of instruments, which can probe the structure of materials or molecules on unprecedented levels of spatial or temporal resolution. Many of such instruments are based on accelerators of charged particles, with particular examples of synchrotron radiation light sources and coherent X-ray Free Electron Lasers. The high cost of such facilities, however, preclude wide spread of such instruments. Modern accelerator science witnesses emergence of a new direction – compact x-ray sources are coming to the scene, enabled by the synergy of accelerators and lasers, where high gradient laser-plasma acceleration can significantly reduce the size and cost of the facilities. Compact x-ray sources will be developed in the nearest future and will share their scientific and market niche with large national scale x-ray facilities. The compact sources will in particular be suitable for placement in universities and medical or technological centres. The compact x-ray light sources are being developed by many centres in UK. Development of compact x-ray FEL is a promising topic for scientific and technological collaboration between UK and Russia, where expertise of partners will cross-fertilize their ability to solve scientific and technological challenges.

Slides MOXCH04 [12.555 MB]

THXCH03

Current FEL Physics Research at SLAC

laser, electron, undulator, radiation

131

G.V. Stupakov
SLAC, Menlo Park, California, USA

Funding: Work is supported by Department of Energy contract DE-AC02-76SF00515
SLAC is a home of the first hard x-ray free electron laser - the Linac Coherent Light Source, or LCLS, based on Self-Amplified Stimulated Emission (SASE) principle. Being a user facility, LCLS, as well as some other installations at SLAC, are, at the same time, test beds of research aimed to improving fundamental characteristics of free electron lasers. In this presentation I will review results of some of these studies. They include studies of the FEL seeding based on the Echo-Enabled Harmonic Generation (EEGH) carried out at the NLCTA facility at SLAC, hard x-ray self seeding at LCLS, noise suppression experiments, and research aimed to achieve terawatt-scale power in FELs. A brief review of the plans for LCLS upgrade will be given.

Slides THXCH03 [10.105 MB]

THXCH04

Budker INP Free Electron Laser Facility – Current Status and Future Prospects

undulator, electron, radiation, linac

136

O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, E.I. Gorniker, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, L.A. Mironenko, V.K. Ovchar, B.Z. Persov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, G.V. Serdobintsev, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, N. Vinokurov, M.G. Vlasenko, P. Vobly, V. Volkov
BINP SB RAS, Novosibirsk, Russia

The free electron laser (FEL) facility at Budker INP is being developed for more than 15 years. It is based on the normal conducting CW energy recovery linac (ERL) with rather complicated magnetic system lattice. Up to now it is the only one in the world multiorbit ERL. It can operate in three different regimes providing electron beam for three different FELs. Its commissioning was naturally divided in three stages. The first stage ERL includes only one orbit placed in vertical plane. It serves as electron beam source for terahertz FEL which started working for users in 2003. Radiation of this FEL is used by several groups of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized in experiments on material ablation and biological objects modification. The second stage ERL is composed of two orbits located in horizontal plane. The second stage FEL is installed on the bypass of the second orbit. The first lasing of this FEL was achieved in 2009. The last stage ERL will include four orbits. Its commissioning is in progress now. In this paper we report the latest results obtained from the operating FELs as well as our progress with the commissioning of the two remaining ERL beamlines. We also discuss possible options for the future upgrade.

Slides THXCH04 [5.360 MB]

TUPPB050

The System of Power Supplies, Control and Modulation of Electron Gun for Free Electron Laser

controls, electron, cathode, free-electron-laser

427

V.K. Ovchar, V.R. Kozak, E.A. Kuper, V.R. Mamkin, V.V. Repkov, S.S. Serednyakov, S.V. Tararyshkin, D.A. Zverev
BINP SB RAS, Novosibirsk, Russia

The system of power supplies, control and modulation based on triode cathode-grid unit was designed for producing of pulsed electron beam for free electron laser FEL The main part of the system located inside the tank filled with SF6 gas and has -300 kV potential. It's supplied through the isolated transformer and controlled through the fiber optic link with CAN interface. The GaN RF transistor in the output stage of modulator composed of hybrid assembly on the BeO ceramic plate. Pulsed output voltage of modulator can be regulated 0-120 V on the load 25 Ohm. Time duration is <1 ns. Repetition rate is 0-90 MHz. Start of modulator from timer performed through the 1GHz fiber optic link. The control code was written on C++ language under Windows operating system using QT framework.

TUPPB052

A ps-Pulsed E-gun Advanced to a T-wave Source of MW-level Peak Power

laser, electron, cathode, radiation

430

A.V. Smirnov
RadiaBeam, Santa Monica, USA

Funding: Department of Energy
A coherent source based on a electron gun is considered to deliver high instantaneous power comparable to that available from just a few other non-FEL and most FEL sources at mm-submillimeter wavelengths. A DC or RF E-gun is integrated with a robust, compact, efficient, dismountable radiator inside the vacuum envelope. Wakefield radiator is driven by a low-energy photoinjector operated in a custom mode combining strong over-focusing, robust slow-wave structure, and pulse sub-ps photoinjectior employing on-cathode beam modulation with conventional optical multiplexing. Single pulse mode operation is enhanced with filed compression effect at high group velocity. The performance is analyzed analytically and numerically supported by experimental data on beam overfocusing. Radiation outcoupling is analyzed as well.

WEPPD003

Diagnostic Technique with Femtosecond Resolution Applied for FEL Electron Bunches

radiation, electron, undulator, photon

572

E. Syresin, A.Yu. Grebentsov, R.S. Makarov, N.A. Morozov, M.V. Yurkov
JINR, Dubna, Moscow Region, Russia
O.I. Brovko, A.V. Shabunov
JINR/VBLHEP, Moscow, Russia

Diagnostic technique applied for FEL ultrashort electron bunches is developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort electron bunches are based on calorimetric measurements and detection of undulator radiation. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The pump probe experiments with VUV and FIR undulators provide the bunch profile measurements with resolution of several femtosecond. The MCP based radiation detectors are effectively used at FLASH for VUV pulse energy measurements. The new three MCP detectors operated in X-ray range are under development now in JINR for SASE1-SASE 3 XFEL.

WEPPD013

Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery

electron, cavity, linac, photon

593

V.G. Kurakin, P.V. Kurakin
LPI, Moscow, Russia

In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.