ICALEPCS2011 - List of Authors (Vitelli, R.)

Paper

Title

Page

Shape Controller Upgrades for the JET ITER-like Wall

514

A. Neto, D. Alves, I.S. Carvalho
IPFN, Lisbon, Portugal
G. De Tommasi, F. Maviglia
CREATE, Napoli, Italy
R.C. Felton, P. McCullen
EFDA-JET, Abingdon, Oxon, United Kingdom
P.J. Lomas, F. G. Rimini, A.V. Stephen, K-D. Zastrow
CCFE, Culham, Abingdon, Oxon, United Kingdom
R. Vitelli
Università di Roma II Tor Vergata, Roma, Italy

Funding: This work was supported by the European Communities under the contract of Association between EURATOM/IST and was carried out within the framework of the European Fusion Development Agreement.
The upgrade of JET to a new all-metal wall will pose a set of new challenges regarding machine operation and protection. One of the key problems is that the present way of terminating a pulse, upon the detection of a problem, is limited to a predefined set of global responses, tailored to maximise the likelihood of a safe plasma landing. With the new wall, these might conflict with the requirement of avoiding localised heat fluxes in the wall components. As a consequence, the new system will be capable of dynamically adapting its response behaviour, according to the experimental conditions at the time of the stop request and during the termination itself. Also in the context of the new ITER-like wall, two further upgrades were designed to be implemented in the shape controller architecture. The first will allow safer operation of the machine and consists of a power-supply current limit avoidance scheme, which provides a trade-off between the desired plasma shape and the current distribution between the relevant actuators. The second is aimed at an optimised operation of the machine, enabling an earlier formation of a special magnetic configuration where the last plasma closed flux surface is not defined by a physical limiter. The upgraded shape controller system, besides providing the new functionality, is expected to continue to provide the first line of defence against erroneous plasma position and current requests. This paper presents the required architectural changes to the JET plasma shape controller system.

Poster MOPMU035 [2.518 MB]

THDAULT06

MARTe Framework: a Middleware for Real-time Applications Development

1277

A. Neto, D. Alves, B. Carvalho, P.J. Carvalho, H. Fernandes, D.F. Valcárcel
IPFN, Lisbon, Portugal
A. Barbalace, G. Manduchi
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy
L. Boncagni
ENEA C.R. Frascati, Frascati (Roma), Italy
G. De Tommasi
CREATE, Napoli, Italy
P. McCullen, A.V. Stephen
CCFE, Culham, Abingdon, Oxon, United Kingdom
F. Sartori
F4E, Barcelona, Spain
R. Vitelli
Università di Roma II Tor Vergata, Roma, Italy
L. Zabeo
ITER Organization, St. Paul lez Durance, France

Funding: This work was supported by the European Communities under the contract of Association between EURATOM/IST and was carried out within the framework of the European Fusion Development Agreement
The Multi-threaded Application Real-Time executor (MARTe) is a C++ framework that provides a development environment for the design and deployment of real-time applications, e.g. control systems. The kernel of MARTe comprises a set of data-driven independent blocks, connected using a shared bus. This modular design enforces a clear boundary between algorithms, hardware interaction and system configuration. The architecture, being multi-platform, facilitates the test and commissioning of new systems, enabling the execution of plant models in offline environments and with the hardware-in-the-loop, whilst also providing a set of non-intrusive introspection and logging facilities. Furthermore, applications can be developed in non real-time environments and deployed in a real-time operating system, using exactly the same code and configuration data. The framework is already being used in several fusion experiments, with control cycles ranging from 50 microseconds to 10 milliseconds exhibiting jitters of less than 2%, using VxWorks, RTAI or Linux. Codes can also be developed and executed in Microsoft Windows, Solaris and Mac OS X. This paper discusses the main design concepts of MARTe, in particular the architectural choices which enabled the combination of real-time accuracy, performance and robustness with complex and modular data driven applications.

Slides THDAULT06 [1.535 MB]

Paper	Title	Page
MOPMU035	Shape Controller Upgrades for the JET ITER-like Wall	514
	A. Neto, D. Alves, I.S. Carvalho IPFN, Lisbon, Portugal G. De Tommasi, F. Maviglia CREATE, Napoli, Italy R.C. Felton, P. McCullen EFDA-JET, Abingdon, Oxon, United Kingdom P.J. Lomas, F. G. Rimini, A.V. Stephen, K-D. Zastrow CCFE, Culham, Abingdon, Oxon, United Kingdom R. Vitelli Università di Roma II Tor Vergata, Roma, Italy
	Funding: This work was supported by the European Communities under the contract of Association between EURATOM/IST and was carried out within the framework of the European Fusion Development Agreement. The upgrade of JET to a new all-metal wall will pose a set of new challenges regarding machine operation and protection. One of the key problems is that the present way of terminating a pulse, upon the detection of a problem, is limited to a predefined set of global responses, tailored to maximise the likelihood of a safe plasma landing. With the new wall, these might conflict with the requirement of avoiding localised heat fluxes in the wall components. As a consequence, the new system will be capable of dynamically adapting its response behaviour, according to the experimental conditions at the time of the stop request and during the termination itself. Also in the context of the new ITER-like wall, two further upgrades were designed to be implemented in the shape controller architecture. The first will allow safer operation of the machine and consists of a power-supply current limit avoidance scheme, which provides a trade-off between the desired plasma shape and the current distribution between the relevant actuators. The second is aimed at an optimised operation of the machine, enabling an earlier formation of a special magnetic configuration where the last plasma closed flux surface is not defined by a physical limiter. The upgraded shape controller system, besides providing the new functionality, is expected to continue to provide the first line of defence against erroneous plasma position and current requests. This paper presents the required architectural changes to the JET plasma shape controller system.
	Poster MOPMU035 [2.518 MB]

THDAULT06	MARTe Framework: a Middleware for Real-time Applications Development	1277
	A. Neto, D. Alves, B. Carvalho, P.J. Carvalho, H. Fernandes, D.F. Valcárcel IPFN, Lisbon, Portugal A. Barbalace, G. Manduchi Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy L. Boncagni ENEA C.R. Frascati, Frascati (Roma), Italy G. De Tommasi CREATE, Napoli, Italy P. McCullen, A.V. Stephen CCFE, Culham, Abingdon, Oxon, United Kingdom F. Sartori F4E, Barcelona, Spain R. Vitelli Università di Roma II Tor Vergata, Roma, Italy L. Zabeo ITER Organization, St. Paul lez Durance, France
	Funding: This work was supported by the European Communities under the contract of Association between EURATOM/IST and was carried out within the framework of the European Fusion Development Agreement The Multi-threaded Application Real-Time executor (MARTe) is a C++ framework that provides a development environment for the design and deployment of real-time applications, e.g. control systems. The kernel of MARTe comprises a set of data-driven independent blocks, connected using a shared bus. This modular design enforces a clear boundary between algorithms, hardware interaction and system configuration. The architecture, being multi-platform, facilitates the test and commissioning of new systems, enabling the execution of plant models in offline environments and with the hardware-in-the-loop, whilst also providing a set of non-intrusive introspection and logging facilities. Furthermore, applications can be developed in non real-time environments and deployed in a real-time operating system, using exactly the same code and configuration data. The framework is already being used in several fusion experiments, with control cycles ranging from 50 microseconds to 10 milliseconds exhibiting jitters of less than 2%, using VxWorks, RTAI or Linux. Codes can also be developed and executed in Microsoft Windows, Solaris and Mac OS X. This paper discusses the main design concepts of MARTe, in particular the architectural choices which enabled the combination of real-time accuracy, performance and robustness with complex and modular data driven applications.
	Slides THDAULT06 [1.535 MB]