RUPAC2012 - List of Authors (Repkov, V.V.)

Paper

Title

Page

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

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

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.

WEPPD033

The System for Control of an Electron Beam Welding Machines

620

V.V. Repkov, E.A. Kuper, A.Yu. Protopopov, A.A. Zharikov
BINP SB RAS, Novosibirsk, Russia

The report examines the main problems that had to be overcome in developing the system for control of an electron beam welding machines. The electronics of the system is under potential of the accelerating voltage (60 kV), therefore it required solving the problem of power transmission and control signals. The volume of the device had to be minimized as the place to put the electronics was limited. The electronics must be resistant to high voltage breakdowns as when breakdowns there may be a voltage pulse of 60 kV with energy to 20 J in any of the cathode electrode unit. The power, necessary for the heater, can reach 250 W. To solve this task the stabilized power supply with an adustment range of 0-125 A (2.5 V) current was developed. The power needed for this power supply operating is transmitted via a special high frequency (25 kHz) transformer. The isolation voltage between the primary and secondary windings of the transformer is 100 kV. To control the current of the beam (welding current), a linear amplifier, which generates the voltage on the control grid in the range 0–4 kV, was developed. The amplifier bandwidth is 1 kHz. To control the current beam, current intensity, and to control the parameters of the gun, a specialized controller was developed. The connection of the controller with a computer is carried out with the help of optical links.

Paper	Title	Page
THXCH04	Budker INP Free Electron Laser Facility – Current Status and Future Prospects	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	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.

WEPPD033	The System for Control of an Electron Beam Welding Machines	620
	V.V. Repkov, E.A. Kuper, A.Yu. Protopopov, A.A. Zharikov BINP SB RAS, Novosibirsk, Russia
	The report examines the main problems that had to be overcome in developing the system for control of an electron beam welding machines. The electronics of the system is under potential of the accelerating voltage (60 kV), therefore it required solving the problem of power transmission and control signals. The volume of the device had to be minimized as the place to put the electronics was limited. The electronics must be resistant to high voltage breakdowns as when breakdowns there may be a voltage pulse of 60 kV with energy to 20 J in any of the cathode electrode unit. The power, necessary for the heater, can reach 250 W. To solve this task the stabilized power supply with an adustment range of 0-125 A (2.5 V) current was developed. The power needed for this power supply operating is transmitted via a special high frequency (25 kHz) transformer. The isolation voltage between the primary and secondary windings of the transformer is 100 kV. To control the current of the beam (welding current), a linear amplifier, which generates the voltage on the control grid in the range 0–4 kV, was developed. The amplifier bandwidth is 1 kHz. To control the current beam, current intensity, and to control the parameters of the gun, a specialized controller was developed. The connection of the controller with a computer is carried out with the help of optical links.