RUPAC2012 - List of Keywords (feedback)

Paper	Title	Other Keywords	Page
TUBCH01	Transient Beam Response in Synchrotrons with a Digital Transverse Feedback System	damping, kicker, synchrotron, resonance	73
	V. Zhabitsky JINR, Dubna, Moscow Region, Russia
	The transient beam response on an externally applied impulse force in synchrotrons with a digital transverse feedback system is studied. Experimental data from the LHC on damping of coherent transverse oscillations excited by the discrete-time unit impulse are analysed. Good agreement on the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning, based on measurements of bunch response on harmonic excitation impulse, is discussed.
	Slides TUBCH01 [5.652 MB]

WEYCH01	Accelerator Complex U70 of IHEP: Status and Upgrades	extraction, ion, bunching, proton	85
	S.V. Ivanov IHEP, Moscow Region, Russia
	The report overviews present status of the Accelerator Complex U70 of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades implemented since the previous conference RuPAC-2010.
	Slides WEYCH01 [2.404 MB]

TUPPB027	Some Problems of Beam Slow Extraction	extraction, controls, resonance, beam-transport	373
	S.N. Andrianov St. Petersburg State University, St. Petersburg, Russia
	Funding: The work is supported by Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia in 2009-2013" (Governmental Contract no. p 793) In this paper we discuss some problems of modeling of beam slow extraction systems. It is known that similar type of beam extraction is used for different kind of circular accelerators. Among the most important requirements for such systems is necessary to mention the time uniformity of the extracted beam. There exist the following two key causes. The first of them is induced by time discontinuity of the corresponding steering electrical currents, and the second cause is induced by an beam inertia which usually connected with beam feedback mechanism, which is usually used for temporal smoothing of the corresponding magnetic (and electrical) fields. In the base of our approach we put the matrix formalism for Lie algebraic tools, which allows us to analyze different kind of the time discontinuity cause.

WEPPC030	High-Voltage Source with Output Voltage up to 110 kV with Output Current up to 100 mA	high-voltage, controls, interlocks	506
	I.A. Gusev, A.S. Medvedko, A.Yu. Protopopov, D.N. Pureskin, D.V. Senkov BINP SB RAS, Novosibirsk, Russia
	The presented report contains the description of high-voltage source with output voltage up to 110 kV and output current up to 100 A. The source consist of the chopper with IGBT switches working with a principle of pulse-width modulation and the full H-bridge converter with IGBT switches, both working on programmed from 15 to 25 kHz frequency, and the high voltage transformer powering the four-stage multiplier with the additional capacity filter at output. The transformer and multiplier both is made in oil tank with silicon oil. The additional capacity filter provides low ripple and noise level in working range of output currents. A nominal output voltage of the source is 110 kV. The source can operate in normal mode with series of high-voltage breakdown in output voltage. In the high-voltage breakdown the released in load and matching circuit energy is less than 20 J at maximum operating voltage 120kV. The efficiency of system is more than 80% at the nominally output power 11 kW. The controller of the source is developed with DSP and PLM, which allows optimizing operations of the source. For control of the source serial CAN-interface is used. The description of the source and the test results are presented.

WEPPC031	3-Channel Current Source with Channel Output Current up to 180 A and Output Voltage up to 180 V	controls, quadrupole, power-supply, 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.

WEPPD046	Digital Delay-Line Periodic FIR Filter Layout of Transverse Feedback in the U70	pick-up, damping, betatron, kicker	647
	O.P. Lebedev, N.A. Ignashin, S.V. Ivanov, S.E. Sytov IHEP, Moscow Region, Russia
	A novel architecture of the wide-band transverse feedback system was successfully beam-tested in the U70 proton synchrotron of IHEP-Protvino. It employs a finite-time impulse response (FIR) non-recursive filter layout based on 3 (or 4, optionally) variable (10%) multi-turn digital delay lines. Apart of using these natural-to-DSP components, the configuration involved has, at least, two operational advantages: (1) A single beam pickup layout plus acceptability of an arbitrary betatron phase advance between pickup and kicker. (2) A straightforward rejection of hampering DC and higher rotation frequency harmonic signals from beam position readouts. The latter occurs due to a periodic notch nature inherent in the amplitude-frequency in-out open-loop feedback transfer function. The paper reports on technical solutions implemented, problem-oriented R&D studies, and beam observations.

Paper

Title

Other Keywords

Page

TUBCH01

Transient Beam Response in Synchrotrons with a Digital Transverse Feedback System

damping, kicker, synchrotron, resonance

73

V. Zhabitsky
JINR, Dubna, Moscow Region, Russia

The transient beam response on an externally applied impulse force in synchrotrons with a digital transverse feedback system is studied. Experimental data from the LHC on damping of coherent transverse oscillations excited by the discrete-time unit impulse are analysed. Good agreement on the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning, based on measurements of bunch response on harmonic excitation impulse, is discussed.

Slides TUBCH01 [5.652 MB]

WEYCH01

Accelerator Complex U70 of IHEP: Status and Upgrades

extraction, ion, bunching, proton

85

S.V. Ivanov
IHEP, Moscow Region, Russia

The report overviews present status of the Accelerator Complex U70 of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades implemented since the previous conference RuPAC-2010.

Slides WEYCH01 [2.404 MB]

TUPPB027

Some Problems of Beam Slow Extraction

extraction, controls, resonance, beam-transport

373

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

Funding: The work is supported by Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia in 2009-2013" (Governmental Contract no. p 793)
In this paper we discuss some problems of modeling of beam slow extraction systems. It is known that similar type of beam extraction is used for different kind of circular accelerators. Among the most important requirements for such systems is necessary to mention the time uniformity of the extracted beam. There exist the following two key causes. The first of them is induced by time discontinuity of the corresponding steering electrical currents, and the second cause is induced by an beam inertia which usually connected with beam feedback mechanism, which is usually used for temporal smoothing of the corresponding magnetic (and electrical) fields. In the base of our approach we put the matrix formalism for Lie algebraic tools, which allows us to analyze different kind of the time discontinuity cause.

WEPPC030

High-Voltage Source with Output Voltage up to 110 kV with Output Current up to 100 mA

high-voltage, controls, interlocks

506

I.A. Gusev, A.S. Medvedko, A.Yu. Protopopov, D.N. Pureskin, D.V. Senkov
BINP SB RAS, Novosibirsk, Russia

The presented report contains the description of high-voltage source with output voltage up to 110 kV and output current up to 100 A. The source consist of the chopper with IGBT switches working with a principle of pulse-width modulation and the full H-bridge converter with IGBT switches, both working on programmed from 15 to 25 kHz frequency, and the high voltage transformer powering the four-stage multiplier with the additional capacity filter at output. The transformer and multiplier both is made in oil tank with silicon oil. The additional capacity filter provides low ripple and noise level in working range of output currents. A nominal output voltage of the source is 110 kV. The source can operate in normal mode with series of high-voltage breakdown in output voltage. In the high-voltage breakdown the released in load and matching circuit energy is less than 20 J at maximum operating voltage 120kV. The efficiency of system is more than 80% at the nominally output power 11 kW. The controller of the source is developed with DSP and PLM, which allows optimizing operations of the source. For control of the source serial CAN-interface is used. The description of the source and the test results are presented.

WEPPC031

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

controls, quadrupole, power-supply, 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.

WEPPD046

Digital Delay-Line Periodic FIR Filter Layout of Transverse Feedback in the U70

pick-up, damping, betatron, kicker

647

O.P. Lebedev, N.A. Ignashin, S.V. Ivanov, S.E. Sytov
IHEP, Moscow Region, Russia

A novel architecture of the wide-band transverse feedback system was successfully beam-tested in the U70 proton synchrotron of IHEP-Protvino. It employs a finite-time impulse response (FIR) non-recursive filter layout based on 3 (or 4, optionally) variable (10%) multi-turn digital delay lines. Apart of using these natural-to-DSP components, the configuration involved has, at least, two operational advantages: (1) A single beam pickup layout plus acceptability of an arbitrary betatron phase advance between pickup and kicker. (2) A straightforward rejection of hampering DC and higher rotation frequency harmonic signals from beam position readouts. The latter occurs due to a periodic notch nature inherent in the amplitude-frequency in-out open-loop feedback transfer function. The paper reports on technical solutions implemented, problem-oriented R&D studies, and beam observations.