ICALEPCS1991 - List of Keywords (plasma)

Paper	Title	Other Keywords	Page
S05SRN06	Present Status of the JT-60 Control System	controls, operation, timing, interface	218
	T. Kimura JAEA/NAKA, Ibaraki-ken, Japan
	The present status of the control system for a large fusion device of the JT-60 upgrade tokamak is reported including its original design concept, the progress of the system in the past five-year operation and modification for the upgrade. The control system has the features of hierarchical structure, computer control, adoption of CAMAC interfaces and protective interlock by both software and hard-wired systems. Plant monitoring and control are performed by an efficient data communication via CAMAC highways. Sequential discharge control of is executed by a combination of computers and a timing system. A plasma feedback control system with fast 32-bit microprocessors and a man/machine interface with modern workstations have been newly developed for the operation of the JT-60 upgrade.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN06
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)

S05SRN07	Conceptual Design of Centralized Control System for LHD	controls, operation, experiment, status	224
	H. Kaneko, Y. Taniguchi, K. Yamazaki NIFS, Chikusa-ku, Nagoya, Japan
	A centralized control system for a fusion experimental machine is discussed. A configuration whereby a number of complete and uniform local systems are controlled by a central computer, a timer and an interlock system is appropriate for the control system of the Large Helical Device (LHD). A connection among local systems can be made by Ethernet, because a faster transmission of control data is processed by a specific system.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN07
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)

S05SRN08	Status of LHD Control System Design	controls, operation, experiment, feedback	228
	K. Yamazaki, H. Kaneko, 0. Motojima, Y. Taniguchi NIFS, Chikusa-ku, Nagoya, Japan
	The present status of LHD (Large Helical Device) control system design is described, emphasizing on the plasma operation modes, the architecture of the LHD control system, the real-time plasma feedback system with PID or Fuzzy controllers and the construction schedule of the LHD control system. The conceptual and detailed designs are under way taking flexible and reliable operations for physics experiments into account.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN08
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)

S10TS06	Modular Pulse Sequencing in a Tokamak System	experiment, electron, timing, coupling	364
	A.C. Chew, S. Lee, S.H. Saw Plasma Research Laboratory, University of Malaya, Kuala Lumpur, Malaysia
	Pulse technique applied in the timing and sequencing of the various part of the MUT tokamak system are discussed. The modular architecture of the pulse generating device highlights the versatile application of the simple physical concepts in precise and complicated research experiment. In experimental studies of pulse plasma devices, timing and sequencing of the various events are an important part of the experiment and requires careful considerations. This is achieved in the MUT (University of Malaya Tokamak) tokamak system by employing modular architecture involving various modules of pulse generating devices.
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S10TS06
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)

S12FC08	Development of a VME Multi-Processor System for Plasma Control at the JT-60 Upgrade	controls, power-supply, 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S12FC09	Very Fast Feedback Control of Coil-Current in JT-60 Tokamak	controls, power-supply, real-time, 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

S05SRN06

Present Status of the JT-60 Control System

controls, operation, timing, interface

218

T. Kimura
JAEA/NAKA, Ibaraki-ken, Japan

The present status of the control system for a large fusion device of the JT-60 upgrade tokamak is reported including its original design concept, the progress of the system in the past five-year operation and modification for the upgrade. The control system has the features of hierarchical structure, computer control, adoption of CAMAC interfaces and protective interlock by both software and hard-wired systems. Plant monitoring and control are performed by an efficient data communication via CAMAC highways. Sequential discharge control of is executed by a combination of computers and a timing system. A plasma feedback control system with fast 32-bit microprocessors and a man/machine interface with modern workstations have been newly developed for the operation of the JT-60 upgrade.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN06

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)

S05SRN07

Conceptual Design of Centralized Control System for LHD

controls, operation, experiment, status

224

H. Kaneko, Y. Taniguchi, K. Yamazaki
NIFS, Chikusa-ku, Nagoya, Japan

A centralized control system for a fusion experimental machine is discussed. A configuration whereby a number of complete and uniform local systems are controlled by a central computer, a timer and an interlock system is appropriate for the control system of the Large Helical Device (LHD). A connection among local systems can be made by Ethernet, because a faster transmission of control data is processed by a specific system.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN07

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)

S05SRN08

Status of LHD Control System Design

controls, operation, experiment, feedback

228

K. Yamazaki, H. Kaneko, 0. Motojima, Y. Taniguchi
NIFS, Chikusa-ku, Nagoya, Japan

The present status of LHD (Large Helical Device) control system design is described, emphasizing on the plasma operation modes, the architecture of the LHD control system, the real-time plasma feedback system with PID or Fuzzy controllers and the construction schedule of the LHD control system. The conceptual and detailed designs are under way taking flexible and reliable operations for physics experiments into account.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S05SRN08

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)

S10TS06

Modular Pulse Sequencing in a Tokamak System

experiment, electron, timing, coupling

364

A.C. Chew, S. Lee, S.H. Saw
Plasma Research Laboratory, University of Malaya, Kuala Lumpur, Malaysia

Pulse technique applied in the timing and sequencing of the various part of the MUT tokamak system are discussed. The modular architecture of the pulse generating device highlights the versatile application of the simple physical concepts in precise and complicated research experiment. In experimental studies of pulse plasma devices, timing and sequencing of the various events are an important part of the experiment and requires careful considerations. This is achieved in the MUT (University of Malaya Tokamak) tokamak system by employing modular architecture involving various modules of pulse generating devices.

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S10TS06

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)

S12FC08

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

controls, power-supply, 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

Cite •

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

S12FC09

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

controls, power-supply, real-time, 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

Cite •

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