PCaPAC2012 - List of Keywords (cryogenics)

Paper	Title	Other Keywords	Page
WEKA01	The CSS Story	controls, EPICS, site, factory	1
	M.R. Clausen, J. Hatje, J. Penning DESY, Hamburg, Germany
	Control System Studio (CSS) is designed to serve as an integration platform for engineering and operation of todays process controls as well as machine controls systems. Therefore CSS is not yet another replacement of existing operator interfaces (OPI) but a complete environment for the control room covering alarm management, archived data displays diagnostic tools and last not least operator interfaces. In addition we decided to use CSS as the platform for the whole engineering chain configuring EPICS based process control databases, configuring and managing the I/O, editing state notation programs, configuring role based access rights and many more. Due to the ease of use of CSS as an Eclipse based product, we decided to use the CSS core also for all our stand alone processes. This helped us to reduce the diversity of running products/ processes and simplified the management. In this presentation we will describe our experience with CSS over the last two years. How we managed the transition from old displays to new ones, how we changed our alarm/ message philosophy and last not least which lessons we learned.
	Slides WEKA01 [2.926 MB]

THPD02	What it Takes to Make a System Reliable	controls, PLC, EPICS	139
	M.R. Clausen, M. Möller, S. Rettig-Labusga, B. Schoeneburg DESY, Hamburg, Germany
	What is a reliable system and how is reliability defined? This depends on the actual situation and in which environment the system is operated. If you can rely on a scheduled downtime of the controlled system every week, reliability is defined in hours or weeks. In this case the system must run just longer than the scheduled downtime. If the system has to continuously operate for months and even years, your requirements are rising. In cases where continuous operations must be guaranteed even during software or hardware updates, redundant systems come into play. The hardware selection process is driven by basic requirements like 'no moving parts' or 'redundant power supplies'. This implies the selection of possible (fan-less) CPU boards with passive cooling. It also implies no hard discs and reduces therefore the selection of possible operating systems. Continuous operation during updates requires redundant controllers/ CPUs also in addition to redundant power supplies. The latter has a lot of impact on the software running inside the controllers. We will describe the selection process of the components we have chosen and summarize our experience of several years of operations.
	Poster THPD02 [0.280 MB]

FRCA02	Status Report, Future Plans and Maintenance Issues of VME Based Cryogenic Control System at IUAC	controls, linac, target, GUI	245
	J. Antony, T.S. Datta, D.S. Mathuria IUAC, New Delhi, India
	The Cryogenic Data Acquisition and Control system (CRYO-DACS) at IUAC was commissioned successfully in the year 2002 and has been continuously in operation since then with uptime better than 95%. The aim of CRYO-DACS is to control and acquire many analog and digital cryogenic parameters of super conducting LINAC and related equipments like beam-line cryostats, helium compressors, cryogenic distribution etc. The complete system is implemented using two VME crates, housing I/O modules, placed far apart and interconnected using Ethernet. The software implementation and maintenance have also been trouble-free which used IOWORKS as the development tool for embedded CPUs running VxWORKS. The OPC Client was developed using VB6 & MSACCESS RDBMS for data logging, viewing and trending under Windows 2000 stable server. In summary, this paper will elaborate the implementation, use and related failures faced for last 10 years and the subsequent corrective actions taken to keep the system running for such a long time round the clock along with some future plans.
	Slides FRCA02 [4.305 MB]

FRCD02	Process Control for Parallel Run of Two Helium Liquefiers at VEC Centre, Kolkata	controls, cyclotron, simulation, superconducting-magnet	285
	S. Pal, U. Panda VECC, Kolkata, India R. Basak WBSEDCL, India
	Two helium liquefiers are working in tandem while one is always connected with the superconducting cyclotron. High pressure (HP) and low pressure (LP) controls are necessary to maintain varying helium flow to the cold box. Since these two liquefiers share the same HP and LP pipelines, any pressure fluctuation due to rapid change in flow sometimes causes trip to the liquefiers. To overcome this problem there is a need for fast responsive HP control. Introduction of derivative gain in the PID loop for fast action is not desirable as it creates instability to the control system. This problem was rectified by introducing a novel control scheme based on the forced opening of the unloading valve to push back helium gas to buffer tank by changing the offset of PI control as a function of Buffer Tank pressure. A simulation using Matlab Simulink was performed initially to check the performance of pressure control loop. The same is implemented in the control loop of the new liquefier and an experiment was performed. The experimental results obtained will be discussed in the final paper.
	Slides FRCD02 [1.375 MB]

Paper

Title

Other Keywords

Page

WEKA01

The CSS Story

controls, EPICS, site, factory

1

M.R. Clausen, J. Hatje, J. Penning
DESY, Hamburg, Germany

Control System Studio (CSS) is designed to serve as an integration platform for engineering and operation of todays process controls as well as machine controls systems. Therefore CSS is not yet another replacement of existing operator interfaces (OPI) but a complete environment for the control room covering alarm management, archived data displays diagnostic tools and last not least operator interfaces. In addition we decided to use CSS as the platform for the whole engineering chain configuring EPICS based process control databases, configuring and managing the I/O, editing state notation programs, configuring role based access rights and many more. Due to the ease of use of CSS as an Eclipse based product, we decided to use the CSS core also for all our stand alone processes. This helped us to reduce the diversity of running products/ processes and simplified the management. In this presentation we will describe our experience with CSS over the last two years. How we managed the transition from old displays to new ones, how we changed our alarm/ message philosophy and last not least which lessons we learned.

Slides WEKA01 [2.926 MB]

THPD02

What it Takes to Make a System Reliable

controls, PLC, EPICS

139

M.R. Clausen, M. Möller, S. Rettig-Labusga, B. Schoeneburg
DESY, Hamburg, Germany

What is a reliable system and how is reliability defined? This depends on the actual situation and in which environment the system is operated. If you can rely on a scheduled downtime of the controlled system every week, reliability is defined in hours or weeks. In this case the system must run just longer than the scheduled downtime. If the system has to continuously operate for months and even years, your requirements are rising. In cases where continuous operations must be guaranteed even during software or hardware updates, redundant systems come into play. The hardware selection process is driven by basic requirements like 'no moving parts' or 'redundant power supplies'. This implies the selection of possible (fan-less) CPU boards with passive cooling. It also implies no hard discs and reduces therefore the selection of possible operating systems. Continuous operation during updates requires redundant controllers/ CPUs also in addition to redundant power supplies. The latter has a lot of impact on the software running inside the controllers. We will describe the selection process of the components we have chosen and summarize our experience of several years of operations.

Poster THPD02 [0.280 MB]

FRCA02

Status Report, Future Plans and Maintenance Issues of VME Based Cryogenic Control System at IUAC

controls, linac, target, GUI

245

J. Antony, T.S. Datta, D.S. Mathuria
IUAC, New Delhi, India

The Cryogenic Data Acquisition and Control system (CRYO-DACS) at IUAC was commissioned successfully in the year 2002 and has been continuously in operation since then with uptime better than 95%. The aim of CRYO-DACS is to control and acquire many analog and digital cryogenic parameters of super conducting LINAC and related equipments like beam-line cryostats, helium compressors, cryogenic distribution etc. The complete system is implemented using two VME crates, housing I/O modules, placed far apart and interconnected using Ethernet. The software implementation and maintenance have also been trouble-free which used IOWORKS as the development tool for embedded CPUs running VxWORKS. The OPC Client was developed using VB6 & MSACCESS RDBMS for data logging, viewing and trending under Windows 2000 stable server. In summary, this paper will elaborate the implementation, use and related failures faced for last 10 years and the subsequent corrective actions taken to keep the system running for such a long time round the clock along with some future plans.

Slides FRCA02 [4.305 MB]

FRCD02

Process Control for Parallel Run of Two Helium Liquefiers at VEC Centre, Kolkata

controls, cyclotron, simulation, superconducting-magnet

285

S. Pal, U. Panda
VECC, Kolkata, India
R. Basak
WBSEDCL, India

Two helium liquefiers are working in tandem while one is always connected with the superconducting cyclotron. High pressure (HP) and low pressure (LP) controls are necessary to maintain varying helium flow to the cold box. Since these two liquefiers share the same HP and LP pipelines, any pressure fluctuation due to rapid change in flow sometimes causes trip to the liquefiers. To overcome this problem there is a need for fast responsive HP control. Introduction of derivative gain in the PID loop for fast action is not desirable as it creates instability to the control system. This problem was rectified by introducing a novel control scheme based on the forced opening of the unloading valve to push back helium gas to buffer tank by changing the offset of PI control as a function of Buffer Tank pressure. A simulation using Matlab Simulink was performed initially to check the performance of pressure control loop. The same is implemented in the control loop of the new liquefier and an experiment was performed. The experimental results obtained will be discussed in the final paper.

Slides FRCD02 [1.375 MB]