ICALEPCS1991 - List of Keywords (power-supply)

Paper	Title	Other Keywords	Page
S01SRA06	Recent Developments of the ALPI Control System	controls, operation, storage-ring, electron	23
	G. Bassato, A. Battistella, M.A. Bellato, S. Canella INFN/LNL, Legnaro (PD), Italy
	This paper presents recent developments of the control system for ALPI, the new superconducting linear accelerator that will begin to operate at L.N.L. next year. Both hardware and software architectures are described and some base choices are discussed. Results of tests performed in the last two years are also reported.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S01SRA06
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S02SRU07	Upgrading the BEPC Control System	controls, software, operation, distributed	82
	L.P. Yang, L.Z. Wang, S.-Y. Liu IHEP, Beijing, People’s Republic of China
	The BEPC control system has been put into operation and operated normally since the end of 1987. Three years’s experience shows this system can satisfy basically the operation requirements, also exhibits some disadvantages a raised from the original centralized system architecture based on the VAX-VCC-CAMAC, such as slow response, bottle neck of VCC, less CPU power for control etc. This paper describes the method and procedure for upgrading the BEPC control system which will be based on DECnet and DEC-WS, and thus intend to upgrade the control system architecture from the centralized to the distributed and improve the integral system performance.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S02SRU07
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S03SRD01	Controls for the CERN Large Hadron Collider (LHC)	controls, software, injection, database	100
	K.H. Kissler, F. Perriollat, M. Rabany, G. Shering CERN, Meyrin, Switzerland
	CERN’s planned large superconducting collider project presents several new challenges to the Control System. These are discussed along with current thinking as to how they can be met. The high field superconducting magnets are subject to "persistent currents" which will require real time measurements and control using a mathematical model on a 2-10 second time interval. This may be realised using direct links, multiplexed using TDM, between the field equipment and central servers. Quench control and avoidance will make new demands on speed of response, reliability and surveillance. The integration of large quantities of industrially controlled equipment will be important. Much of the controls will be in common with LEP so a seamless integration of LHC and LEP controls will be sought. A very large amount of new high-tech equipment will have to be tested, assembled and installed in the LEP tunnel in a short time. The manpower and cost constraints will be much tighter than previously. New approaches will have to be found to solve many of these problems, with the additional constraint of integrating them into an existing framework.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S03SRD01
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S03SRD14	Control System for HIMAC Synchrotron	controls, synchrotron, Ethernet, timing	156
	T. Kohno, K. Sato, E. Takada, K. Noda, A.I. Itano, M. Kanazawa, M. Sudou, K. Asami, R. Azumaishi, Y. Morii, N. Tsuzuki, H. Narusaka, Y. Hirao NIRS, Chiba-shi, Japan K. Asami, R. Azumaishi Hitachi, Ltd., Ibaraki-ken, Japan Y. Morii TMEIC, Tokyo, Japan N. Tsuzuki Toshiba Mitsubishi Electric Industrial Systems Corporation, Tokyo, Japan H. Narusaka DEC-Japan, Tokyo, Japan
	A control system for HIMAC synchrotron has been designed. The system consists of a main computer, console workstations, a few small computers and VME-computers connected via Ethernet. The small computers are dedicated to the control of an injection line, an extraction line and an RF system. Power supplies in main rings are controlled by the VME-computers through FDI/FDO, DI/DO modules. This paper describes an overview of the synchrotron control system.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S03SRD14
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S04SRS07	Multi-Microprocessor Control of the Main Ring Magnet Power Supply of the 12 GeV KEK Proton Synchrotron	controls, injection, operation, software	180
	T. Sueno, K. Mikawa, M. Toda, T. Toyama, H. Sato, S. Matsumoto KEK, Ibaraki, Japan
	A general description of the computer control system of the KEK 12 GeV PS main ring magnet power supply is given, including its peripheral devices. The system consists of the main HIDIC-V90/2S CPU and of the input and output controllers HISEC-04M. The main CPU, supervised by UNIX, provides the man-machine interfacing and implements the repetitive control algorithm to correct for any magnet current deviation from reference. Two sub-CPU’s are linked by a LAN and supported by a real time multi-task monitor. The output process controller distributes the control patterns to 16-bit DAC’s, at 1.67 ms clock period in synchronism with the 3-phase ac line systems. The input controller logs the magnet current and voltage, via 16-bit ADC’s at the same clock rate.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S04SRS07
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S04SRS09	Magnet Power Supply and Beam Line Control for a Secondary Beam Line K6	controls, operation, status, monitoring	188
	Y. Suzuki, M. Takasaki, M. Minakawa, H. Ishii, Y. Kato, M. Ieiri, K.H. Tanaka, H. Noumi, Y. Yamanoi KEK, Ibaraki, Japan
	K6 is a secondary separated-beam line with momentum range up to 2.0 GeV/c in the north experimental hall at the KEK 12 GeV Proton Synchrotron (KEK-PS). On the construction, newly developed magnet power supplies (MPSs), in each of them a microprocessor is embedded, are introduced. The features of the MPS are as follows: 1) The MPS is connected to an upper-level beam line controller (BLC) by GPIB highway for exchanging simple messages. 2) All the operations of the MPS are supervised by the microprocessor, which has its individual parameters and fault messages. It reduces the load of the upper-level controller. 3) The MPS has functions to inspect itself and to report the results. It saves much time and labor of maintenance.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S04SRS09
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S08NC08	Network Communication Libraries for the Next Control System of the KEK e⁻/e⁺ Linac	controls, network, linac, Ethernet	318
	N. Kamikubota, I. Abe, K. Furukawa, K. Nakahara KEK, Ibaraki, Japan
	The network communication libraries for the next control system of the KEK Linac have been developed. They are based on TCP/IP sockets, and show high availability among the different operating systems: UNIX, VAX/VMS, and MS-DOS. They also show high source portability of application programs among the different computer systems provided by various vendors. The performance and problems are presented in detail.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC08
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S11LLC03	High Accuracy ADC and DAC Systems for Accelerator Control Applications	controls, operation, storage-ring, electron	382
	E.A. Kuper, A. Ledenev BINP SB RAS, Novosibirsk, Russia
	In the work presented here the ways of construction, the apparatus for the precision measurements and control systems incorporated in the accelerating facilities of INP are considered. All the apparatus are developed and manufactured in the standard of CAMAC.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC03
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S11LLC10	High Accuracy Measurement of Magnetic Field in Pulse Magnetic Elements	operation, polarization, controls, coupling	406
	V. Kargaltsev, E.A. Kuper BINP SB RAS, Novosibirsk, Russia
	A CAMAC module intended for measurements of instant magnetic field using coil sensor is described. It is four channel integrating ADC with current input in which signal integration time is controlled externally and may be optimized for a given signal. Original technical solution allowing to eliminate influence of the integrator capacity and switches instability on overall accuracy is described. The large accelerator facilities include a great number of magnetic elements interacting with a beam for a short period ranging from 0.01 ms to 10 ms. For example, this class of elements includes all the magnetic components of channels for particle transportation. In addition, most of these elements are operating rarely - once in 1 - 10000 s. For these elements the most optimal is the use of a pulse power supply that reduces the electric power consumption and which is most important, it solves the problem of heat removal. Though, the pulse power supply poses some problems in providing the accuracy of magnetic field and its measurements.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC10
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S12FC04	Feedback Systems for Local Control of Race Track Microtron RF Accelerating Sections	controls, feedback, resonance, klystron	424
	A.S. Chepurnov, I.V. Gribov, S.Yu. Morozov, A.V. Shumakov, S.V. Zinoviev MSU, Moscow, Russia
	In order to obtain an electron beam with an excellent energy resolution and stable characteristics, a tight control of the amplitude and phase of the field in all rf accelerating sections is required. The high rf power level, dissipated in the accelerating section (AS), together with temperature dependence of the AS resonance frequency caused the creation of the original control system of resonance frequency. Amplitude, phase and resonance frequency local feedback control system have been designed. All systems are computer controlled analogue single loops. The control loops guarantee stable, repeatable amplitudes (10^-1 relative error), phases (± 0.5°) of the rf fields in AS, resonance frequency of AS (± 2 kHz) and have optimal bandwidth. A model of feedback loops has been developed that agrees well with measurements.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC04
About •	Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S12FC08	Development of a VME Multi-Processor System for Plasma Control at the JT-60 Upgrade	controls, plasma, operation, feedback	438
	M. Takahashi, H. Akasaka, Y. Kawamata, T. Kimura, K. Kurihara JAEA/NAKA, Ibaraki-ken, Japan
	Design and initial operation results are reported of a VME multi-processor system for plasma control at a large fusion device named "the JT-60 Upgrade" utilizing three 32-bit MC88100 based RISC computers and VME components. Development of the system was stimulated by faster and more accurate computation requirements for the plasma position and current control. The RISC computers operate at 25 MHz along with two cache memories named MC88200. We newly developed VME bus modules of up/down counter, analog-to-digital converter and clock pulse generator for measuring magnetic field and coil current and for synchronizing the processing in the three RISCs and direct digital controllers (DDCs) of magnet power supplies. We also evaluated that the speed of the data transfer between the VME bus system and the DDCs through CAMAC highways satisfies the above requirements. In the initial operation of the JT-60 upgrade, it has been proved that the VME multi-processor system well controls the plasma position and current with a sampling period of 250 ¿sec and a delay of 500 ¿sec.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC08
About •	Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992
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S12FC09	Very Fast Feedback Control of Coil-Current in JT-60 Tokamak	controls, real-time, plasma, software	442
	T. Aoyagi, Y. Matsuzaki, H. Nobusaka, M. Takahashi, T. Terakado, J. Yagyu JAEA/NAKA, Ibaraki-ken, Japan
	A direct digital control (DDC) system is adopted for controlling thyristor converters of power supplies in the JT-60 tokamak built in 1984. Microcomputers of the DDC were 5 MHz i8086 microprocessor and programs were written by assembler language and the processing time was under l ms. They were, however, too old in hardware and too complicated in software. New DDC system has been made in the JT-60 Upgrade (JT-60U) to control the power supplies more quickly under 0.25 and 0.5 ms of the processing time and also to write the programs used by high-level language. The new system consists of a host computer and five microcomputers with microprocessor on VMEbus system. The host computer AS3260 performs on-line processing such as setting the DDC under the discharge conditions and so on. Functions of the microcomputers with a 32-bit, 20 MHz microprocessor MC68030, whose OS are VxWorks and programs are written by C language, are real-time processing such as taking in instructions from a ZENKEI computer and in feedback control of currents and voltages of coils every 0.25 and 0.5 ms. The system is now operating very smoothly.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC09
About •	Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992
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S14OOP04	Object Oriented Programming Techniques Applied to Device Access and Control	device-server, controls, network, SRF	514
	A. Götz, W.D. Klotz, J.M. Meyer ESRF, Grenoble, France
	Device access and device control is one of the most important tasks of any control system. This is because control implies obtaining information about the physical world by reading sensors and modifying the behaviour of the physical world by sending commands to actuators. At the European Synchrotron Radiation Facility (ESRF) effort has gone into designing and implementing a model for device access and control using as much as possible the latest ideas and methods of Software Engineering. One of the main contributions in recent years to Software Engineering has been in the field of Object Oriented Programming (OOP). Although the philosophy is not new the refinement and application of this methodology on a wide scale is. At the ESRF a model for device access and control has been developed which is based on OOP methods. This model, called the device server model, is the topic of this paper. The device server model is written entirely in C and is therefore portable. It depends on no other software and can be ported to any machine where there is a C compiler. Because the model is based on OOP it presents a user-oriented view of the world as opposed to a software- or hardware-oriented view of the world. This paper will describe the device server model. It will describe the problem of device access and the advantages of using OOP techniques to solve it. It will present the model. The methodology used to implement OOP in the device server model called Objects In C (OIC) will be described. An example of a typical device server at the ESRF will be presented. The experience gained from the device server model will be discussed. The paper will conclude with a discussion on how the device server model could be standardised to treat a wider range of problems.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S14OOP04
About •	Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

S01SRA06

Recent Developments of the ALPI Control System

controls, operation, storage-ring, electron

23

G. Bassato, A. Battistella, M.A. Bellato, S. Canella
INFN/LNL, Legnaro (PD), Italy

This paper presents recent developments of the control system for ALPI, the new superconducting linear accelerator that will begin to operate at L.N.L. next year. Both hardware and software architectures are described and some base choices are discussed. Results of tests performed in the last two years are also reported.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S01SRA06

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S02SRU07

Upgrading the BEPC Control System

controls, software, operation, distributed

82

L.P. Yang, L.Z. Wang, S.-Y. Liu
IHEP, Beijing, People’s Republic of China

The BEPC control system has been put into operation and operated normally since the end of 1987. Three years’s experience shows this system can satisfy basically the operation requirements, also exhibits some disadvantages a raised from the original centralized system architecture based on the VAX-VCC-CAMAC, such as slow response, bottle neck of VCC, less CPU power for control etc. This paper describes the method and procedure for upgrading the BEPC control system which will be based on DECnet and DEC-WS, and thus intend to upgrade the control system architecture from the centralized to the distributed and improve the integral system performance.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S02SRU07

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S03SRD01

Controls for the CERN Large Hadron Collider (LHC)

controls, software, injection, database

100

K.H. Kissler, F. Perriollat, M. Rabany, G. Shering
CERN, Meyrin, Switzerland

CERN’s planned large superconducting collider project presents several new challenges to the Control System. These are discussed along with current thinking as to how they can be met. The high field superconducting magnets are subject to "persistent currents" which will require real time measurements and control using a mathematical model on a 2-10 second time interval. This may be realised using direct links, multiplexed using TDM, between the field equipment and central servers. Quench control and avoidance will make new demands on speed of response, reliability and surveillance. The integration of large quantities of industrially controlled equipment will be important. Much of the controls will be in common with LEP so a seamless integration of LHC and LEP controls will be sought. A very large amount of new high-tech equipment will have to be tested, assembled and installed in the LEP tunnel in a short time. The manpower and cost constraints will be much tighter than previously. New approaches will have to be found to solve many of these problems, with the additional constraint of integrating them into an existing framework.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S03SRD01

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S03SRD14

Control System for HIMAC Synchrotron

controls, synchrotron, Ethernet, timing

156

T. Kohno, K. Sato, E. Takada, K. Noda, A.I. Itano, M. Kanazawa, M. Sudou, K. Asami, R. Azumaishi, Y. Morii, N. Tsuzuki, H. Narusaka, Y. Hirao
NIRS, Chiba-shi, Japan
K. Asami, R. Azumaishi
Hitachi, Ltd., Ibaraki-ken, Japan
Y. Morii
TMEIC, Tokyo, Japan
N. Tsuzuki
Toshiba Mitsubishi Electric Industrial Systems Corporation, Tokyo, Japan
H. Narusaka
DEC-Japan, Tokyo, Japan

A control system for HIMAC synchrotron has been designed. The system consists of a main computer, console workstations, a few small computers and VME-computers connected via Ethernet. The small computers are dedicated to the control of an injection line, an extraction line and an RF system. Power supplies in main rings are controlled by the VME-computers through FDI/FDO, DI/DO modules. This paper describes an overview of the synchrotron control system.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S03SRD14

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S04SRS07

Multi-Microprocessor Control of the Main Ring Magnet Power Supply of the 12 GeV KEK Proton Synchrotron

controls, injection, operation, software

180

T. Sueno, K. Mikawa, M. Toda, T. Toyama, H. Sato, S. Matsumoto
KEK, Ibaraki, Japan

A general description of the computer control system of the KEK 12 GeV PS main ring magnet power supply is given, including its peripheral devices. The system consists of the main HIDIC-V90/2S CPU and of the input and output controllers HISEC-04M. The main CPU, supervised by UNIX, provides the man-machine interfacing and implements the repetitive control algorithm to correct for any magnet current deviation from reference. Two sub-CPU’s are linked by a LAN and supported by a real time multi-task monitor. The output process controller distributes the control patterns to 16-bit DAC’s, at 1.67 ms clock period in synchronism with the 3-phase ac line systems. The input controller logs the magnet current and voltage, via 16-bit ADC’s at the same clock rate.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S04SRS07

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S04SRS09

Magnet Power Supply and Beam Line Control for a Secondary Beam Line K6

controls, operation, status, monitoring

188

Y. Suzuki, M. Takasaki, M. Minakawa, H. Ishii, Y. Kato, M. Ieiri, K.H. Tanaka, H. Noumi, Y. Yamanoi
KEK, Ibaraki, Japan

K6 is a secondary separated-beam line with momentum range up to 2.0 GeV/c in the north experimental hall at the KEK 12 GeV Proton Synchrotron (KEK-PS). On the construction, newly developed magnet power supplies (MPSs), in each of them a microprocessor is embedded, are introduced. The features of the MPS are as follows: 1) The MPS is connected to an upper-level beam line controller (BLC) by GPIB highway for exchanging simple messages. 2) All the operations of the MPS are supervised by the microprocessor, which has its individual parameters and fault messages. It reduces the load of the upper-level controller. 3) The MPS has functions to inspect itself and to report the results. It saves much time and labor of maintenance.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S04SRS09

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

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

S08NC08

Network Communication Libraries for the Next Control System of the KEK e⁻/e⁺ Linac

controls, network, linac, Ethernet

318

N. Kamikubota, I. Abe, K. Furukawa, K. Nakahara
KEK, Ibaraki, Japan

The network communication libraries for the next control system of the KEK Linac have been developed. They are based on TCP/IP sockets, and show high availability among the different operating systems: UNIX, VAX/VMS, and MS-DOS. They also show high source portability of application programs among the different computer systems provided by various vendors. The performance and problems are presented in detail.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC08

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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

S11LLC03

High Accuracy ADC and DAC Systems for Accelerator Control Applications

controls, operation, storage-ring, electron

382

E.A. Kuper, A. Ledenev
BINP SB RAS, Novosibirsk, Russia

In the work presented here the ways of construction, the apparatus for the precision measurements and control systems incorporated in the accelerating facilities of INP are considered. All the apparatus are developed and manufactured in the standard of CAMAC.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC03

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

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

S11LLC10

High Accuracy Measurement of Magnetic Field in Pulse Magnetic Elements

operation, polarization, controls, coupling

406

V. Kargaltsev, E.A. Kuper
BINP SB RAS, Novosibirsk, Russia

A CAMAC module intended for measurements of instant magnetic field using coil sensor is described. It is four channel integrating ADC with current input in which signal integration time is controlled externally and may be optimized for a given signal. Original technical solution allowing to eliminate influence of the integrator capacity and switches instability on overall accuracy is described. The large accelerator facilities include a great number of magnetic elements interacting with a beam for a short period ranging from 0.01 ms to 10 ms. For example, this class of elements includes all the magnetic components of channels for particle transportation. In addition, most of these elements are operating rarely - once in 1 - 10000 s. For these elements the most optimal is the use of a pulse power supply that reduces the electric power consumption and which is most important, it solves the problem of heat removal. Though, the pulse power supply poses some problems in providing the accuracy of magnetic field and its measurements.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC10

About •

Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

Cite •

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

S12FC04

Feedback Systems for Local Control of Race Track Microtron RF Accelerating Sections

controls, feedback, resonance, klystron

424

A.S. Chepurnov, I.V. Gribov, S.Yu. Morozov, A.V. Shumakov, S.V. Zinoviev
MSU, Moscow, Russia

In order to obtain an electron beam with an excellent energy resolution and stable characteristics, a tight control of the amplitude and phase of the field in all rf accelerating sections is required. The high rf power level, dissipated in the accelerating section (AS), together with temperature dependence of the AS resonance frequency caused the creation of the original control system of resonance frequency. Amplitude, phase and resonance frequency local feedback control system have been designed. All systems are computer controlled analogue single loops. The control loops guarantee stable, repeatable amplitudes (10^-1 relative error), phases (± 0.5°) of the rf fields in AS, resonance frequency of AS (± 2 kHz) and have optimal bandwidth. A model of feedback loops has been developed that agrees well with measurements.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC04

About •

Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992

Cite •

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

S12FC08

Development of a VME Multi-Processor System for Plasma Control at the JT-60 Upgrade

controls, plasma, operation, feedback

438

M. Takahashi, H. Akasaka, Y. Kawamata, T. Kimura, K. Kurihara
JAEA/NAKA, Ibaraki-ken, Japan

Design and initial operation results are reported of a VME multi-processor system for plasma control at a large fusion device named "the JT-60 Upgrade" utilizing three 32-bit MC88100 based RISC computers and VME components. Development of the system was stimulated by faster and more accurate computation requirements for the plasma position and current control. The RISC computers operate at 25 MHz along with two cache memories named MC88200. We newly developed VME bus modules of up/down counter, analog-to-digital converter and clock pulse generator for measuring magnetic field and coil current and for synchronizing the processing in the three RISCs and direct digital controllers (DDCs) of magnet power supplies. We also evaluated that the speed of the data transfer between the VME bus system and the DDCs through CAMAC highways satisfies the above requirements. In the initial operation of the JT-60 upgrade, it has been proved that the VME multi-processor system well controls the plasma position and current with a sampling period of 250 ¿sec and a delay of 500 ¿sec.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC08

About •

Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992

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S12FC09

Very Fast Feedback Control of Coil-Current in JT-60 Tokamak

controls, real-time, plasma, software

442

T. Aoyagi, Y. Matsuzaki, H. Nobusaka, M. Takahashi, T. Terakado, J. Yagyu
JAEA/NAKA, Ibaraki-ken, Japan

A direct digital control (DDC) system is adopted for controlling thyristor converters of power supplies in the JT-60 tokamak built in 1984. Microcomputers of the DDC were 5 MHz i8086 microprocessor and programs were written by assembler language and the processing time was under l ms. They were, however, too old in hardware and too complicated in software. New DDC system has been made in the JT-60 Upgrade (JT-60U) to control the power supplies more quickly under 0.25 and 0.5 ms of the processing time and also to write the programs used by high-level language. The new system consists of a host computer and five microcomputers with microprocessor on VMEbus system. The host computer AS3260 performs on-line processing such as setting the DDC under the discharge conditions and so on. Functions of the microcomputers with a 32-bit, 20 MHz microprocessor MC68030, whose OS are VxWorks and programs are written by C language, are real-time processing such as taking in instructions from a ZENKEI computer and in feedback control of currents and voltages of coils every 0.25 and 0.5 ms. The system is now operating very smoothly.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC09

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Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992

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S14OOP04

Object Oriented Programming Techniques Applied to Device Access and Control

device-server, controls, network, SRF

514

A. Götz, W.D. Klotz, J.M. Meyer
ESRF, Grenoble, France

Device access and device control is one of the most important tasks of any control system. This is because control implies obtaining information about the physical world by reading sensors and modifying the behaviour of the physical world by sending commands to actuators. At the European Synchrotron Radiation Facility (ESRF) effort has gone into designing and implementing a model for device access and control using as much as possible the latest ideas and methods of Software Engineering. One of the main contributions in recent years to Software Engineering has been in the field of Object Oriented Programming (OOP). Although the philosophy is not new the refinement and application of this methodology on a wide scale is. At the ESRF a model for device access and control has been developed which is based on OOP methods. This model, called the device server model, is the topic of this paper. The device server model is written entirely in C and is therefore portable. It depends on no other software and can be ported to any machine where there is a C compiler. Because the model is based on OOP it presents a user-oriented view of the world as opposed to a software- or hardware-oriented view of the world. This paper will describe the device server model. It will describe the problem of device access and the advantages of using OOP techniques to solve it. It will present the model. The methodology used to implement OOP in the device server model called Objects In C (OIC) will be described. An example of a typical device server at the ESRF will be presented. The experience gained from the device server model will be discussed. The paper will conclude with a discussion on how the device server model could be standardised to treat a wider range of problems.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S14OOP04

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Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992

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