RUPAC2012 - List of Keywords (power-supply)

Paper	Title	Other Keywords	Page
WEBOR01	The C-80 Cyclotron System. Technical Characteristics, Current Status, Progress and Prospects.	cyclotron, proton, controls, diagnostics	106
	Yu.N. Gavrish, P.V. Bogdanov, A.V. Galchuck, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, A.N. Kuzhlev, Yu.D. Menshov, V.G. Mudrolyubov, V.I. Ponomarenko, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko NIIEFA, St. Petersburg, Russia S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, G.A. Riabov, V.M. Samsonov PNPI, Gatchina, Leningrad District, Russia
	A C-80 cyclotron system is intended to produce proton beams with an energy ranging from 40 up to 80 MeV and current up to 200 mkA. The beams with these parameters will be used for commercial production of a wide spectrum of isotopes for medicine, proton radiation therapy of eye diseases and superficial oncologic diseases as well as for fundamental and applied researches. Manufacturing and installation of the cyclotron equipment and first section of the system for the beam transport to remote targets have been finished. Physical start-up of the cyclotron has been realized. In future, the C-80 cyclotron is supposed to be used as an injector of the C-230 synchrotron, which serves for additional acceleration of the extracted proton beam to energies of the order of 230 MeV. This will allow the Bragg's peak-based treatment procedures to be applied in the proton therapy of oncologic patients.

THBCH01	High Precision Power Supply for Accelerator Magnets	pick-up, controls, shielding, cyclotron	158
	A.S. Banerjee DAE/VECC, Calcutta, India
	High precision power supplies are used to power various accelerator magnets to generate stable magnetic field required for various dynamic functions of the charged particles in an Accelerator system. High current stability of the order of 5ppm to 100ppm depending on the various functional applications of the accelerator magnet is the main feature of these power supplies. The paper describes the various technical aspects and considerations depicting ripple reduction techniques, regulating loops, high precision temperature controller, R.F. pick-up attenuation, power dissipation control, handling of the input supply line power disturbances etc., which are important for achieving high stability of the power supply.
	Slides THBCH01 [1.036 MB]

FRACH03	The CC1-3 Cyclotron System	cyclotron, vacuum, ion, controls	191
	V.G. Mudrolyubov, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, M.T. Kozienko, A.N. Kuzhlev, V.I. Ponomarenko, V.D. Shiltsev, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko NIIEFA, St. Petersburg, Russia P. Beličev, A. Dobrosavljević, N. Nešković, V. Vujović VINCA, Belgrade, Serbia
	A СС1-3 cyclotron system has been designed to be installed in the Vinca Institute of Nuclear Sciences, Belgrade, Serbia. This system will be operated in the laboratory of nuclear-physical methods of the elemental analysis. The system includes a compact cyclotron and a system for beam shaping with specified energy characteristics. The cyclotron ensures the acceleration of negative hydrogen ions up to energy in the range from 1 to 3 MeV and a beam of protons is extracted by stripping on a thin carbon foil. The beam-shaping system ensures the beam of protons with a spectrum width not more than 0.1%. The main unit of the beam-shaping system is a magnetic analyzer with a bending angle of 270 deg. To date, the equipment of the cyclotron system has been manufactured and tests have been carried out on test facilities in the D.V. Efremov Institute. Installation will be performed in 2012.
	Slides FRACH03 [0.684 MB]

WEPPC017	Pulse Generator for the Beam Injection System of NICA Collider	kicker, injection, collider, pulsed-power	481
	A.A. Fateev, E.V. Gorbachev, N.I. Lebedev JINR, Dubna, Moscow Region, Russia
	The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPC022	Stand for Precision Measurements of Magnetic Lenses Field Quality	quadrupole, controls, synchrotron, octupole	495
	A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly BINP SB RAS, Novosibirsk, Russia
	Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPC028	High Voltage Terminal in COSY Electron Cooler	controls, high-voltage, electron, gun	503
	V.A. Chekavinskiy, E.A. Bekhtenev, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, E.A. Kuper, V.R. Mamkin, A.S. Medvedko, D.N. Pureskin, D.V. Senkov, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia
	In Budker INP SBRAS was developed electron cooler with energy up to 2MeV for COSY accelerator (Germany). Due to restricted footprint, cooler's collector and gun parts were combined in a single acceleration system – high voltage terminal. All power and control electronics were placed in a single isolated volume, filled with SF6 gas under 4-6 atm. pressure. Electronics is controlled via wireless CAN, and powered by multistage transformer, capable of 15 kW power at 26 kHz. Wireless control is passed through dedicated optically transparent window, also served for modulated laser beam, used in electron beam diagnostic. By construction, electronics is divided on two standalone units: collector power supply and gun-filter system (SGF). SGF is built on 19" EuroPak chassis, where were placed all power modules, needed for collector and gun pipe electrodes. All power outputs were protected against overvoltage and sparks, available while cooler exploitation. In SGF there were controlled up to 40 parameters altogether. SGF inner power supply provides stable operation in wide range of input voltage, up to ±50% from nominal. Also included in SGF are 2 auxiliary systems, used for beam guiding and beam diagnostics.

WEPPC031	3-Channel Current Source with Channel Output Current up to 180 A and Output Voltage up to 180 V	controls, quadrupole, feedback, synchrotron	509
	D.V. Senkov, A.I. Erokhin, I.A. Gusev, V.V. Kolmogorov, A.S. Medvedko, S.I. Potapov, D.N. Pureskin BINP SB RAS, Novosibirsk, Russia
	The presented report contains the description of 3-channel current source with channel output current up to 180 A and output voltage. Each channel can be operated and controled independently. The source consists of 2 part. First part is charging source with capasitance bank at output. And the second part is 3 current sources powered by a capacitance bank. The charging source is converter with IGBT switches, working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, with high power rectivier at output. The source output voltage is up to 180 V, peak power is 40 kW and average power is 20 kW. Capacitance bank has 120 kVA storage energy. Second part contains 3 independent current sources with up to 180 A output current each. Each current source consist of H-bridge 2-quadrant convertor with MOSFET switches working on 50 kHz frequency and tho output LC filter. The controllers of the sources is developed with DSP and PLM, which allows optimizing operations of the sources. The controllers are connected by internal control network for more flexibility and efficiency. The description of the source and the test results are presented.

WEPPC032	The Power Supply System for the Accelerating Column of the 2 MeV Electron Cooler for COSY	high-voltage, electron, solenoid, controls	512
	D.N. Skorobogatov, M.I. Bryzgunov, A.D. Goncharov, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, A.S. Medvedko, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov BINP SB RAS, Novosibirsk, Russia
	The electron cooler of a 2 MEV for COSY storage ring FZJ is assembling in BINP. The high energy electron beam produced by the electrostatic accelerating column. The power supply for accelerating column of the electron cooling system consists of 33 distributed by the accelerating potential controlled modules. Each module has precision controlled voltage source 60 kV 1mA, and additional supply for the magnetic system solenoid with a maximal current of 2.5 amperes. All the system controlled through wireless ZIGBEE network. The report presents the structure of the power system, its parameters and the results of tests carried out in BINP.

WEPPC034	Power Supply System of the Pulse Bending Magnet for the Linear Accelerator Operated at the Moscow Meson Factory	kicker, proton, factory, isotope-production	515
	B.O. Bolshakov, A.A. Budtov, A.V. Popov, A.V. Pozhensky NIIEFA, St. Petersburg, Russia A. Feschenko, O.V. Grekhov, V.N. Mikhailov, V.L. Serov RAS/INR, Moscow, Russia
	A bending magnet with a power supply system has been designed and manufactured in the NIIEFA for the Institute for Nuclear Research RAS to ensure simultaneous operation of the linear accelerator in the experimental and isotopic systems. The arrangement has been installed and adjusted in the INR RAS. In the paper are described a schematic and principle of operation of the arrangement ensuring the bending of a part of the beam macroimpulses to the isotopic system with a frequency of up to 50 Hz. The adjustment results are presented.

WEPPD002	Simulations and Design of THz Wiggler for 15-40 MeV FEL	wiggler, simulation, electron, radiation	569
	E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov JINR, Dubna, Moscow Region, Russia
	The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm². The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 10² mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.

WEPPD008	Energy Ramping at Siberia-2	betatron, quadrupole, injection, resonance	581
	A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov NRC, Moscow, Russia
	Siberia-2 storage ring has great difference between injection energy 0.45 GeV and working energy 2.5 GeV. Beam lifetime at injection energy is equal to approximately 1 hour. In order to minimize beam losses of the stored beam it is necessary to accelerate energy ramping process. It is not very simple because power supplies of bending magnets, quadrupole lenses and sextupoles have different response time and behavior after changes in regulated current level. Magnetic elements are manufactured from non-laminated iron. It leads to slower field/gradient increasing at high current values. Complicated algorithm with 9 intermediate regimes (collections of power supplies' settings) was developed to produce fast and efficient energy ramping. First, correction of closed orbit, betatron tunes and chromaticity is accomplished in each regime in static conditions. Special file is used to provide acceleration or deceleration of power supplies in dynamic conditions. This scheme allows to compensate betatron tune shifts during energy ramping. Power supplies are not stopped on intermediate regimes; speed of current changing is continuous function of time. This algorithm allowed decreasing ramping time down to 2 minutes 40 seconds. Beam losses are not exceeding 2 – 3%; betatron tune shifts as a rule are lower than 0.01. The algorithm can easily be modified to stop in any intermediate regime.

WEPPD024	The Quench Detection System for Superconducting Elements of Nuclotron Acceleration Complex	dipole, controls, quadrupole, monitoring	605
	A.O. Sidorin, E.V. Ivanov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	The system provides highly effective detection of quenches in superconducting elements of Nuclotron. Full information about quench element is transmitted to control room. Diagram of analogue quench signal could be displayed on screen for further analysis. The system performs scheduled self-test diagnostics in real time and controls power elements of energy evacuation.

WEPPD033	The System for Control of an Electron Beam Welding Machines	controls, cathode, high-voltage, gun	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

Other Keywords

Page

WEBOR01

The C-80 Cyclotron System. Technical Characteristics, Current Status, Progress and Prospects.

cyclotron, proton, controls, diagnostics

106

Yu.N. Gavrish, P.V. Bogdanov, A.V. Galchuck, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, A.N. Kuzhlev, Yu.D. Menshov, V.G. Mudrolyubov, V.I. Ponomarenko, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko
NIIEFA, St. Petersburg, Russia
S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, G.A. Riabov, V.M. Samsonov
PNPI, Gatchina, Leningrad District, Russia

A C-80 cyclotron system is intended to produce proton beams with an energy ranging from 40 up to 80 MeV and current up to 200 mkA. The beams with these parameters will be used for commercial production of a wide spectrum of isotopes for medicine, proton radiation therapy of eye diseases and superficial oncologic diseases as well as for fundamental and applied researches. Manufacturing and installation of the cyclotron equipment and first section of the system for the beam transport to remote targets have been finished. Physical start-up of the cyclotron has been realized. In future, the C-80 cyclotron is supposed to be used as an injector of the C-230 synchrotron, which serves for additional acceleration of the extracted proton beam to energies of the order of 230 MeV. This will allow the Bragg's peak-based treatment procedures to be applied in the proton therapy of oncologic patients.

THBCH01

High Precision Power Supply for Accelerator Magnets

pick-up, controls, shielding, cyclotron

158

A.S. Banerjee
DAE/VECC, Calcutta, India

High precision power supplies are used to power various accelerator magnets to generate stable magnetic field required for various dynamic functions of the charged particles in an Accelerator system. High current stability of the order of 5ppm to 100ppm depending on the various functional applications of the accelerator magnet is the main feature of these power supplies. The paper describes the various technical aspects and considerations depicting ripple reduction techniques, regulating loops, high precision temperature controller, R.F. pick-up attenuation, power dissipation control, handling of the input supply line power disturbances etc., which are important for achieving high stability of the power supply.

Slides THBCH01 [1.036 MB]

FRACH03

The CC1-3 Cyclotron System

cyclotron, vacuum, ion, controls

191

V.G. Mudrolyubov, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, L.E. Korolev, M.T. Kozienko, A.N. Kuzhlev, V.I. Ponomarenko, V.D. Shiltsev, Yu.I. Stogov, A.P. Strokach, S.S. Tsygankov, I.N. Vasilchenko
NIIEFA, St. Petersburg, Russia
P. Beličev, A. Dobrosavljević, N. Nešković, V. Vujović
VINCA, Belgrade, Serbia

A СС1-3 cyclotron system has been designed to be installed in the Vinca Institute of Nuclear Sciences, Belgrade, Serbia. This system will be operated in the laboratory of nuclear-physical methods of the elemental analysis. The system includes a compact cyclotron and a system for beam shaping with specified energy characteristics. The cyclotron ensures the acceleration of negative hydrogen ions up to energy in the range from 1 to 3 MeV and a beam of protons is extracted by stripping on a thin carbon foil. The beam-shaping system ensures the beam of protons with a spectrum width not more than 0.1%. The main unit of the beam-shaping system is a magnetic analyzer with a bending angle of 270 deg. To date, the equipment of the cyclotron system has been manufactured and tests have been carried out on test facilities in the D.V. Efremov Institute. Installation will be performed in 2012.

Slides FRACH03 [0.684 MB]

WEPPC017

Pulse Generator for the Beam Injection System of NICA Collider

kicker, injection, collider, pulsed-power

481

A.A. Fateev, E.V. Gorbachev, N.I. Lebedev
JINR, Dubna, Moscow Region, Russia

The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPC022

Stand for Precision Measurements of Magnetic Lenses Field Quality

quadrupole, controls, synchrotron, octupole

495

A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly
BINP SB RAS, Novosibirsk, Russia

Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPC028

High Voltage Terminal in COSY Electron Cooler

controls, high-voltage, electron, gun

503

V.A. Chekavinskiy, E.A. Bekhtenev, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, E.A. Kuper, V.R. Mamkin, A.S. Medvedko, D.N. Pureskin, D.V. Senkov, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia

In Budker INP SBRAS was developed electron cooler with energy up to 2MeV for COSY accelerator (Germany). Due to restricted footprint, cooler's collector and gun parts were combined in a single acceleration system – high voltage terminal. All power and control electronics were placed in a single isolated volume, filled with SF6 gas under 4-6 atm. pressure. Electronics is controlled via wireless CAN, and powered by multistage transformer, capable of 15 kW power at 26 kHz. Wireless control is passed through dedicated optically transparent window, also served for modulated laser beam, used in electron beam diagnostic. By construction, electronics is divided on two standalone units: collector power supply and gun-filter system (SGF). SGF is built on 19" EuroPak chassis, where were placed all power modules, needed for collector and gun pipe electrodes. All power outputs were protected against overvoltage and sparks, available while cooler exploitation. In SGF there were controlled up to 40 parameters altogether. SGF inner power supply provides stable operation in wide range of input voltage, up to ±50% from nominal. Also included in SGF are 2 auxiliary systems, used for beam guiding and beam diagnostics.

WEPPC031

3-Channel Current Source with Channel Output Current up to 180 A and Output Voltage up to 180 V

controls, quadrupole, feedback, synchrotron

509

D.V. Senkov, A.I. Erokhin, I.A. Gusev, V.V. Kolmogorov, A.S. Medvedko, S.I. Potapov, D.N. Pureskin
BINP SB RAS, Novosibirsk, Russia

The presented report contains the description of 3-channel current source with channel output current up to 180 A and output voltage. Each channel can be operated and controled independently. The source consists of 2 part. First part is charging source with capasitance bank at output. And the second part is 3 current sources powered by a capacitance bank. The charging source is converter with IGBT switches, working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, with high power rectivier at output. The source output voltage is up to 180 V, peak power is 40 kW and average power is 20 kW. Capacitance bank has 120 kVA storage energy. Second part contains 3 independent current sources with up to 180 A output current each. Each current source consist of H-bridge 2-quadrant convertor with MOSFET switches working on 50 kHz frequency and tho output LC filter. The controllers of the sources is developed with DSP and PLM, which allows optimizing operations of the sources. The controllers are connected by internal control network for more flexibility and efficiency. The description of the source and the test results are presented.

WEPPC032

The Power Supply System for the Accelerating Column of the 2 MeV Electron Cooler for COSY

high-voltage, electron, solenoid, controls

512

D.N. Skorobogatov, M.I. Bryzgunov, A.D. Goncharov, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, A.S. Medvedko, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov
BINP SB RAS, Novosibirsk, Russia

The electron cooler of a 2 MEV for COSY storage ring FZJ is assembling in BINP. The high energy electron beam produced by the electrostatic accelerating column. The power supply for accelerating column of the electron cooling system consists of 33 distributed by the accelerating potential controlled modules. Each module has precision controlled voltage source 60 kV 1mA, and additional supply for the magnetic system solenoid with a maximal current of 2.5 amperes. All the system controlled through wireless ZIGBEE network. The report presents the structure of the power system, its parameters and the results of tests carried out in BINP.

WEPPC034

Power Supply System of the Pulse Bending Magnet for the Linear Accelerator Operated at the Moscow Meson Factory

kicker, proton, factory, isotope-production

515

B.O. Bolshakov, A.A. Budtov, A.V. Popov, A.V. Pozhensky
NIIEFA, St. Petersburg, Russia
A. Feschenko, O.V. Grekhov, V.N. Mikhailov, V.L. Serov
RAS/INR, Moscow, Russia

A bending magnet with a power supply system has been designed and manufactured in the NIIEFA for the Institute for Nuclear Research RAS to ensure simultaneous operation of the linear accelerator in the experimental and isotopic systems. The arrangement has been installed and adjusted in the INR RAS. In the paper are described a schematic and principle of operation of the arrangement ensuring the bending of a part of the beam macroimpulses to the isotopic system with a frequency of up to 50 Hz. The adjustment results are presented.

WEPPD002

Simulations and Design of THz Wiggler for 15-40 MeV FEL

wiggler, simulation, electron, radiation

569

E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov
JINR, Dubna, Moscow Region, Russia

The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm². The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 10² mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.

WEPPD008

Energy Ramping at Siberia-2

betatron, quadrupole, injection, resonance

581

A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov
NRC, Moscow, Russia

Siberia-2 storage ring has great difference between injection energy 0.45 GeV and working energy 2.5 GeV. Beam lifetime at injection energy is equal to approximately 1 hour. In order to minimize beam losses of the stored beam it is necessary to accelerate energy ramping process. It is not very simple because power supplies of bending magnets, quadrupole lenses and sextupoles have different response time and behavior after changes in regulated current level. Magnetic elements are manufactured from non-laminated iron. It leads to slower field/gradient increasing at high current values. Complicated algorithm with 9 intermediate regimes (collections of power supplies' settings) was developed to produce fast and efficient energy ramping. First, correction of closed orbit, betatron tunes and chromaticity is accomplished in each regime in static conditions. Special file is used to provide acceleration or deceleration of power supplies in dynamic conditions. This scheme allows to compensate betatron tune shifts during energy ramping. Power supplies are not stopped on intermediate regimes; speed of current changing is continuous function of time. This algorithm allowed decreasing ramping time down to 2 minutes 40 seconds. Beam losses are not exceeding 2 – 3%; betatron tune shifts as a rule are lower than 0.01. The algorithm can easily be modified to stop in any intermediate regime.

WEPPD024

The Quench Detection System for Superconducting Elements of Nuclotron Acceleration Complex

dipole, controls, quadrupole, monitoring

605

A.O. Sidorin, E.V. Ivanov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

The system provides highly effective detection of quenches in superconducting elements of Nuclotron. Full information about quench element is transmitted to control room. Diagram of analogue quench signal could be displayed on screen for further analysis. The system performs scheduled self-test diagnostics in real time and controls power elements of energy evacuation.

WEPPD033

The System for Control of an Electron Beam Welding Machines

controls, cathode, high-voltage, gun

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.