RuPAC2016 - List of Keywords (feedback)

Paper	Title	Other Keywords	Page
TUCASH07	HF Structure of BETA-8 Electron Resonance Accelerator	cavity, electron, resonance, coupling	188
	M.L. Smetanin VNIIEF, Sarov, Russia
	BETA-8 is new powerful resonance electron accelerator designed in RFNC-VNIIEF to operate in continuous wave generating regime. The basic constituent of accelerator is half-wave coaxial resonator excited at T1 wave. The work presents the main approaches to numerical modeling of accelerator HF power system components. The results of computation of accelerating resonator with operating frequency of 100 MHz and inductive unit of HF power input (UPI) designed to transmit continuous HF signal at operating frequency with mean power level of 600 kW are reported. The transmitting coaxial waveguide connecting UPI with feeding HF generator has been computed, designed and manufactured. The calculated results have been tested by measurements of HF parameters of the resonator assembled with UPI and connecting waveguide. The possibility to locate indicating loop (a detector working in frequency feedback circuit of feeding HF generator) in transmitting feeder has been demonstrated. The method of calibration computation of measuring inductive loop that is an element of amplitude feedback circuit of HF generator is presented. The dual matched load necessary for preliminary adjustment of operating modes of feeding HF generator unit (with mean power up to 180 kW) and technological systems of accelerating complex has been computed, designed and put into operation.
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TUPSA024	On Stabilization of Systems of Linear Equations with Linear Increasing Time Delay by Observation	controls, synchrotron, acceleration, damping	261
	O.N. Chizhova, A.P. Zhabko Saint Petersburg State University, Saint Petersburg, Russia
	Differential-difference equations with time delay are often used in mathematical models describing the dynamics of beams of the charged particles. For example linear equation of the second order with a constant time delay describes in the smoothed approach dynamics of a beam of the charged particles in synchrotrons with a feedback system. However the time delay cannot always be considered constant. The time proportional delay can occur at acceleration of beams of the charged particles in the cyclotron. It should be noted that such time delay is unbounded and well known approaches are not applicable for stability analysis such systems. The stabilizing control for the system of linear equations could be constructed by the information on a state vector of the system. Sometimes the state vector is unknown but we know some linear combinations of its components. Then there is a problem on construction of the stabilizing control with incomplete information. In this paper we investigate a possibility of stabilization of system of linear equations with time proportional delay by the linear observation. Using the sufficient conditions of asymptotic stability of system of linear equations with linear increasing delay we obtain some conditions of existence of the asymptotic evaluation system of the original system. Then we use the asymptotic evaluation system for the construction of the stabilizing control and derive the sufficient conditions for the existence of such control.
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WEPSB023	Formation of a Given Distribution of the Beam in the Periodic Channel	controls, space-charge, focusing, distributed	411
	S.N. Andrianov St. Petersburg State University, St. Petersburg, Russia N.S. Edamenko Saint Petersburg State University, Saint Petersburg, Russia
	The article considers the problem of forming a predetermined distribution density of the beam (in the phase or configuration space) in a periodic channel. The proposed approach is based on a method of constructing a beam mapping in the form of a truncated series consisting from matrices up to necessary order of nonlinearities. Similar approach allows us to formulate the given task as an optimization problem for some special functionals, created from parameters of the accelerator. Some results of the testing tasks are demonstrated.
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WEPSB067	Modeling of ADSR Dynamics With Proton Linac in Multi-Point Approximation	neutron, proton, linac, HOM	511
	A.G. Golovkina St. Petersburg State University, St. Petersburg, Russia
	The mathematical model of multi-point kinetics is proposed in the paper. The transients in subcritical reactor driven by proton linac taking into account the fuel and coolant temperature feedbacks are analyzed using this model. In contrast to the widely used point kinetics model, the proposed model makes it possible to more accurately take into account the heterogeneity of the material composition in the core. That is the one of the main features of transmutation systems with accelerator-driver.
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THPSC021	Corrector magnet power supplies of the European XFEL	power-supply, electron, experiment, hardware	584
	O.V. Belikov, V.R. Kozak, A.S. Medvedko, D.N. Skorobogatov, R. Vahrushev BINP SB RAS, Novosibirsk, Russia H.-J. Eckoldt, N. Heidbrook DESY, Hamburg, Germany
	In 2016 the testing of the first section of the particle accelerator for the European X-ray Free-Electron Laser (XFEL) was completed and the results were excellent. BINP take anticipation in many works of XFEL construction. One of these works is developing, production, system assembling and putting in operation the power supply system for corrector magnets. Since 2012 there were developed, produced and delivered to XFEL 7 models of power supplies with up to 10 A output current and up to 70 V output voltage. Total quantity of delivered power supplies is near 400 pieces. The report presents the structure of power supply system and results of testing.
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THPSC030	High-Precision Ramped High-Voltage Source With Up to 50 kV Output Voltage	high-voltage, booster, interface, electron	609
	D.V. Senkov, A.M. Batrakov, I.A. Gusev, A.Yu. Protopopov, A.A. Zharikov BINP SB RAS, Novosibirsk, Russia
	This report describes the precision high-voltage ramped high-voltage power system. The output voltage up to 50 kV with 10 ppm precision. The power system consists of the 3 kW high-voltage source based on multiplier, presision high-voltage divider with digital interface and high-voltage discharge switch to provide low ramp-down time for output voltage. The power system is planed to use in the NIKA booster electron cooler project. The description and test results are presented.
	Poster THPSC030 [1.985 MB]
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THPSC072	Digital-to-Analog Beam Energy and Current Stabilization of ELV Accelerators	controls, electron, cathode, software	700
	D.S. Vorobev, E.V. Domarov, S. Fadeev, N.K. Kuksanov, A. Lavrukhin, P.I. Nemytov BINP SB RAS, Novosibirsk, Russia
	Funding: Budker Institute of Nuclear Physics, Novosibirsk, Russia. 1.Previous systems of energy and current stabilization are based on analog PID-controllers. They provide good stability at sufficient speed-work. 2.Increased requirements of technological lines to the speed of the accelerator injection to set-up parameters and introduction of technological lines, in which the accelerator is a slave device and should within the shortest possible time to respond onto the changes of operation input parameters, forced us to find the way of stabilization systems improvement. 3.New stabilization system is able to provide current output speed up to 5mA/sec, at required energy stability. 4.Digital-to-analog stabilization is produced as a superstructure on the existing system and is made as a source code added into the basic accelerator control program. This approach enables to modernize simply the existing accelerators. The code itself is two independent parts. The first part is the current beam corrector, which calculate the derivate (current speed) at a time and aims to hold it in set-up range, taking into account the difference of the tasks and the necessity of cathode warm up. The second part is a energy compensator. It adds the current derivate into accelerator energy channel, reducing the energy settlements at once. 5.Present system passed through the testing and it is already installed onto ELV-0.5(0.5MeV, 100mA) accelerator in Qingzhou (a/m tyre production) and onto ELV-8(2.5MeV, 40mA) accelerators in China for cable insulation treatment.
	Poster THPSC072 [3.958 MB]
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THPSC076	Host-Based System to Control the Accelerator	controls, timing, operation, data-acquisition	709
	V.N. Zamriy JINR, Dubna, Moscow Region, Russia
	The report discusses development of the host-based data acquisition system to control the accelerator. We consider modes of timing and allocation of operations of the system node. The time of any working cycle, rate of a data flow and an amount of serviced tasks are coordinated with characteristics of the node. Estimations of the readout rate of the data and the waiting time demonstrate the system efficiency. The data acquisition technique has been developed to provide checking of pulse parameters and control the linac LUE-200 of the neutron source IREN. Ju. Becher et al. "The LUE-200 accelerator at the IREN facility: current status and development", Physics of Elementary Particles and Nuclei: Letters, 11, 1029-1039 (2014).
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THPSC087	Stabilization of the Equilibrium Position of a Magnetic Control System with Delay	controls, simulation, electron, permanent-magnet	736
	A.Yu. Aleksandrov, A.P. Zhabko, I.A. Zhabko Saint Petersburg State University, Saint Petersburg, Russia A.A. Kosov ISDCT SB RAS, Irkutsk, Russia
	Funding: The research was partially supported by the Saint Petersburg State University (project No. 9.37.157.2014), and by the Russian Foundation for Basic Research (grant Nos. 15-08-06680 and 16-01-00587-a). Nonlinear oscillatory systems are widely applied for the modeling of charge particles motions in cyclotrons in neighborhoods of equilibrium orbits. They are also used for the analysis and synthesis of magnetic control devices. An actual problem for such systems is stabilization of their operating modes. In this report, analytical and numerical investigations of stability of the equilibrium position for a nonlinear oscillatory system are presented. The system can be treated as a mathematical model of magnetic suspension control system of a gyro rotor. A delay in the feedback control scheme and dissipative forces occurring due to energy losses at the interaction of the magnetic field with currents in the control loops are taken into account. Two approaches to the synthesis of stabilizing controls are proposed. The first one is based on the using of gyroscopic control forces. It is applicable in the case of essentially nonlinear homogeneous dissipative forces. The second approach is efficient for systems with linear dissipative forces. For this case, potential control forces are constructed. With the aid of a computer simulation of dynamics of closed-loop systems, a comparison of these approaches is fulfilled, and their features and conditions of applicability are determined.
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Paper

Title

Other Keywords

Page

TUCASH07

HF Structure of BETA-8 Electron Resonance Accelerator

cavity, electron, resonance, coupling

188

M.L. Smetanin
VNIIEF, Sarov, Russia

BETA-8 is new powerful resonance electron accelerator designed in RFNC-VNIIEF to operate in continuous wave generating regime. The basic constituent of accelerator is half-wave coaxial resonator excited at T1 wave. The work presents the main approaches to numerical modeling of accelerator HF power system components. The results of computation of accelerating resonator with operating frequency of 100 MHz and inductive unit of HF power input (UPI) designed to transmit continuous HF signal at operating frequency with mean power level of 600 kW are reported. The transmitting coaxial waveguide connecting UPI with feeding HF generator has been computed, designed and manufactured. The calculated results have been tested by measurements of HF parameters of the resonator assembled with UPI and connecting waveguide. The possibility to locate indicating loop (a detector working in frequency feedback circuit of feeding HF generator) in transmitting feeder has been demonstrated. The method of calibration computation of measuring inductive loop that is an element of amplitude feedback circuit of HF generator is presented. The dual matched load necessary for preliminary adjustment of operating modes of feeding HF generator unit (with mean power up to 180 kW) and technological systems of accelerating complex has been computed, designed and put into operation.

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPSA024

On Stabilization of Systems of Linear Equations with Linear Increasing Time Delay by Observation

controls, synchrotron, acceleration, damping

261

O.N. Chizhova, A.P. Zhabko
Saint Petersburg State University, Saint Petersburg, Russia

Differential-difference equations with time delay are often used in mathematical models describing the dynamics of beams of the charged particles. For example linear equation of the second order with a constant time delay describes in the smoothed approach dynamics of a beam of the charged particles in synchrotrons with a feedback system. However the time delay cannot always be considered constant. The time proportional delay can occur at acceleration of beams of the charged particles in the cyclotron. It should be noted that such time delay is unbounded and well known approaches are not applicable for stability analysis such systems. The stabilizing control for the system of linear equations could be constructed by the information on a state vector of the system. Sometimes the state vector is unknown but we know some linear combinations of its components. Then there is a problem on construction of the stabilizing control with incomplete information. In this paper we investigate a possibility of stabilization of system of linear equations with time proportional delay by the linear observation. Using the sufficient conditions of asymptotic stability of system of linear equations with linear increasing delay we obtain some conditions of existence of the asymptotic evaluation system of the original system. Then we use the asymptotic evaluation system for the construction of the stabilizing control and derive the sufficient conditions for the existence of such control.

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WEPSB023

Formation of a Given Distribution of the Beam in the Periodic Channel

controls, space-charge, focusing, distributed

411

S.N. Andrianov
St. Petersburg State University, St. Petersburg, Russia
N.S. Edamenko
Saint Petersburg State University, Saint Petersburg, Russia

The article considers the problem of forming a predetermined distribution density of the beam (in the phase or configuration space) in a periodic channel. The proposed approach is based on a method of constructing a beam mapping in the form of a truncated series consisting from matrices up to necessary order of nonlinearities. Similar approach allows us to formulate the given task as an optimization problem for some special functionals, created from parameters of the accelerator. Some results of the testing tasks are demonstrated.

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WEPSB067

Modeling of ADSR Dynamics With Proton Linac in Multi-Point Approximation

neutron, proton, linac, HOM

511

A.G. Golovkina
St. Petersburg State University, St. Petersburg, Russia

The mathematical model of multi-point kinetics is proposed in the paper. The transients in subcritical reactor driven by proton linac taking into account the fuel and coolant temperature feedbacks are analyzed using this model. In contrast to the widely used point kinetics model, the proposed model makes it possible to more accurately take into account the heterogeneity of the material composition in the core. That is the one of the main features of transmutation systems with accelerator-driver.

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THPSC021

Corrector magnet power supplies of the European XFEL

power-supply, electron, experiment, hardware

584

O.V. Belikov, V.R. Kozak, A.S. Medvedko, D.N. Skorobogatov, R. Vahrushev
BINP SB RAS, Novosibirsk, Russia
H.-J. Eckoldt, N. Heidbrook
DESY, Hamburg, Germany

In 2016 the testing of the first section of the particle accelerator for the European X-ray Free-Electron Laser (XFEL) was completed and the results were excellent. BINP take anticipation in many works of XFEL construction. One of these works is developing, production, system assembling and putting in operation the power supply system for corrector magnets. Since 2012 there were developed, produced and delivered to XFEL 7 models of power supplies with up to 10 A output current and up to 70 V output voltage. Total quantity of delivered power supplies is near 400 pieces. The report presents the structure of power supply system and results of testing.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPSC030

High-Precision Ramped High-Voltage Source With Up to 50 kV Output Voltage

high-voltage, booster, interface, electron

609

D.V. Senkov, A.M. Batrakov, I.A. Gusev, A.Yu. Protopopov, A.A. Zharikov
BINP SB RAS, Novosibirsk, Russia

This report describes the precision high-voltage ramped high-voltage power system. The output voltage up to 50 kV with 10 ppm precision. The power system consists of the 3 kW high-voltage source based on multiplier, presision high-voltage divider with digital interface and high-voltage discharge switch to provide low ramp-down time for output voltage. The power system is planed to use in the NIKA booster electron cooler project. The description and test results are presented.

Poster THPSC030 [1.985 MB]

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THPSC072

Digital-to-Analog Beam Energy and Current Stabilization of ELV Accelerators

controls, electron, cathode, software

700

D.S. Vorobev, E.V. Domarov, S. Fadeev, N.K. Kuksanov, A. Lavrukhin, P.I. Nemytov
BINP SB RAS, Novosibirsk, Russia

Funding: Budker Institute of Nuclear Physics, Novosibirsk, Russia.
1.Previous systems of energy and current stabilization are based on analog PID-controllers. They provide good stability at sufficient speed-work. 2.Increased requirements of technological lines to the speed of the accelerator injection to set-up parameters and introduction of technological lines, in which the accelerator is a slave device and should within the shortest possible time to respond onto the changes of operation input parameters, forced us to find the way of stabilization systems improvement. 3.New stabilization system is able to provide current output speed up to 5mA/sec, at required energy stability. 4.Digital-to-analog stabilization is produced as a superstructure on the existing system and is made as a source code added into the basic accelerator control program. This approach enables to modernize simply the existing accelerators. The code itself is two independent parts. The first part is the current beam corrector, which calculate the derivate (current speed) at a time and aims to hold it in set-up range, taking into account the difference of the tasks and the necessity of cathode warm up. The second part is a energy compensator. It adds the current derivate into accelerator energy channel, reducing the energy settlements at once. 5.Present system passed through the testing and it is already installed onto ELV-0.5(0.5MeV, 100mA) accelerator in Qingzhou (a/m tyre production) and onto ELV-8(2.5MeV, 40mA) accelerators in China for cable insulation treatment.

Poster THPSC072 [3.958 MB]

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THPSC076

Host-Based System to Control the Accelerator

controls, timing, operation, data-acquisition

709

V.N. Zamriy
JINR, Dubna, Moscow Region, Russia

The report discusses development of the host-based data acquisition system to control the accelerator. We consider modes of timing and allocation of operations of the system node. The time of any working cycle, rate of a data flow and an amount of serviced tasks are coordinated with characteristics of the node. Estimations of the readout rate of the data and the waiting time demonstrate the system efficiency. The data acquisition technique has been developed to provide checking of pulse parameters and control the linac LUE-200 of the neutron source IREN*.
* Ju. Becher et al. "The LUE-200 accelerator at the IREN facility: current status and development", Physics of Elementary Particles and Nuclei: Letters, 11, 1029-1039 (2014).

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THPSC087

Stabilization of the Equilibrium Position of a Magnetic Control System with Delay

controls, simulation, electron, permanent-magnet

736

A.Yu. Aleksandrov, A.P. Zhabko, I.A. Zhabko
Saint Petersburg State University, Saint Petersburg, Russia
A.A. Kosov
ISDCT SB RAS, Irkutsk, Russia

Funding: The research was partially supported by the Saint Petersburg State University (project No. 9.37.157.2014), and by the Russian Foundation for Basic Research (grant Nos. 15-08-06680 and 16-01-00587-a).
Nonlinear oscillatory systems are widely applied for the modeling of charge particles motions in cyclotrons in neighborhoods of equilibrium orbits. They are also used for the analysis and synthesis of magnetic control devices. An actual problem for such systems is stabilization of their operating modes. In this report, analytical and numerical investigations of stability of the equilibrium position for a nonlinear oscillatory system are presented. The system can be treated as a mathematical model of magnetic suspension control system of a gyro rotor. A delay in the feedback control scheme and dissipative forces occurring due to energy losses at the interaction of the magnetic field with currents in the control loops are taken into account. Two approaches to the synthesis of stabilizing controls are proposed. The first one is based on the using of gyroscopic control forces. It is applicable in the case of essentially nonlinear homogeneous dissipative forces. The second approach is efficient for systems with linear dissipative forces. For this case, potential control forces are constructed. With the aid of a computer simulation of dynamics of closed-loop systems, a comparison of these approaches is fulfilled, and their features and conditions of applicability are determined.

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