ICALEPCS2011 - List of Authors (Rowland, J.)

Paper

Title

Page

Algorithms and Data Structures for the EPICS Channel Archiver

94

J. Rowland, M.T. Heron, M.A. Leech, S.J. Singleton, K. Vijayan
Diamond, Oxfordshire, United Kingdom

Diamond Light Source records 3GB of process data per day and has a 15TB archive on line with the EPICS Channel Archiver. This paper describes recent modifications to the software to improve performance and usability. The file-size limit on the R-Tree index has been removed, allowing all archived data to be searchable from one index. A decimation system works directly on compressed archives from a backup server and produces multi-rate reduced data with minimum and maximum values to support time efficient summary reporting and range queries. The XMLRPC interface has been extended to provide binary data transfer to clients needing large amounts of raw data.

Poster MOPKN006 [0.133 MB]

MOPKS001

Diamond Light Source Booster Fast Orbit Feedback System

160

S. Gayadeen, S. Duncan
University of Oxford, Oxford, United Kingdom
C. Christou, M.T. Heron, J. Rowland
Diamond, Oxfordshire, United Kingdom

The Fast Orbit Feedback system that has been installed on the Diamond Light Source Storage ring has been replicated on the Booster synchrotron in order to provide a test bed for the development of the Storage Ring controller design. To realise this the Booster is operated in DC mode. The electron beam is regulated in two planes using the Fast Orbit Feedback system, which takes the beam position from 22 beam position monitors for each plane, and calculates offsets to 44 corrector power supplies at a sample rate of 10~kHz. This paper describes the design and realization of the controller for the Booster Fast Orbit Feedback, presents results from the implementation and considers future development.

Poster MOPKS001 [0.597 MB]

WEMAU004

Integrating EtherCAT Based IO into EPICS at Diamond

662

R. Mercado, I.J. Gillingham, J. Rowland, K.G. Wilkinson
Diamond, Oxfordshire, United Kingdom

Diamond Light Source is actively investigating the use of EtherCAT-based Remote I/O modules for the next phase of photon beamline construction. Ethernet-based I/O in general is attractive, because of reduced equipment footprint, flexible configuration and reduced cabling. EtherCAT offers, in addition, the possibility of using inexpensive Ethernet hardware, off-the-shelf components with a throughput comparable to current VME based solutions. This paper presents the work to integrate EtherCAT-based I/O to the EPICS control system, listing platform decisions, requirement considerations and software design, and discussing the use of real-time pre-emptive Linux extensions to support high-rate devices that require deterministic sampling.

Slides WEMAU004 [0.057 MB]

Poster WEMAU004 [0.925 MB]

FRBHMULT06

EPICS V4 Expands Support to Physics Application, Data Acsuisition, and Data Analysis

1338

L.R. Dalesio, G. Carcassi, M.A. Davidsaver, M.R. Kraimer, R. Lange, N. Malitsky, G. Shen
BNL, Upton, Long Island, New York, USA
T. Korhonen
Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
J. Rowland
Diamond, Oxfordshire, United Kingdom
M. Sekoranja
Cosylab, Ljubljana, Slovenia
G.R. White
SLAC, Menlo Park, California, USA

Funding: Work supported under auspices of the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC, and in part by the DOE Contract DE-AC02-76SF00515
EPICS version 4 extends the functionality of version 3 by providing the ability to define, transport, and introspect composite data types. Version 3 provided a set of process variables and a data protocol that adequately defined scalar data along with an atomic set of attributes. While remaining backward compatible, Version 4 is able to easily expand this set with a data protocol capable of exchanging complex data types and parameterized data requests. Additionally, a group of engineers defined reference types for some applications in this environment. The goal of this work is to define a narrow interface with the minimal set of data types needed to support a distributed architecture for physics applications, data acquisition, and data analysis.

Slides FRBHMULT06 [0.188 MB]

Paper	Title	Page
MOPKN006	Algorithms and Data Structures for the EPICS Channel Archiver	94
	J. Rowland, M.T. Heron, M.A. Leech, S.J. Singleton, K. Vijayan Diamond, Oxfordshire, United Kingdom
	Diamond Light Source records 3GB of process data per day and has a 15TB archive on line with the EPICS Channel Archiver. This paper describes recent modifications to the software to improve performance and usability. The file-size limit on the R-Tree index has been removed, allowing all archived data to be searchable from one index. A decimation system works directly on compressed archives from a backup server and produces multi-rate reduced data with minimum and maximum values to support time efficient summary reporting and range queries. The XMLRPC interface has been extended to provide binary data transfer to clients needing large amounts of raw data.
	Poster MOPKN006 [0.133 MB]

MOPKS001	Diamond Light Source Booster Fast Orbit Feedback System	160
	S. Gayadeen, S. Duncan University of Oxford, Oxford, United Kingdom C. Christou, M.T. Heron, J. Rowland Diamond, Oxfordshire, United Kingdom
	The Fast Orbit Feedback system that has been installed on the Diamond Light Source Storage ring has been replicated on the Booster synchrotron in order to provide a test bed for the development of the Storage Ring controller design. To realise this the Booster is operated in DC mode. The electron beam is regulated in two planes using the Fast Orbit Feedback system, which takes the beam position from 22 beam position monitors for each plane, and calculates offsets to 44 corrector power supplies at a sample rate of 10~kHz. This paper describes the design and realization of the controller for the Booster Fast Orbit Feedback, presents results from the implementation and considers future development.
	Poster MOPKS001 [0.597 MB]

WEMAU004	Integrating EtherCAT Based IO into EPICS at Diamond	662
	R. Mercado, I.J. Gillingham, J. Rowland, K.G. Wilkinson Diamond, Oxfordshire, United Kingdom
	Diamond Light Source is actively investigating the use of EtherCAT-based Remote I/O modules for the next phase of photon beamline construction. Ethernet-based I/O in general is attractive, because of reduced equipment footprint, flexible configuration and reduced cabling. EtherCAT offers, in addition, the possibility of using inexpensive Ethernet hardware, off-the-shelf components with a throughput comparable to current VME based solutions. This paper presents the work to integrate EtherCAT-based I/O to the EPICS control system, listing platform decisions, requirement considerations and software design, and discussing the use of real-time pre-emptive Linux extensions to support high-rate devices that require deterministic sampling.
	Slides WEMAU004 [0.057 MB]
	Poster WEMAU004 [0.925 MB]

FRBHMULT06	EPICS V4 Expands Support to Physics Application, Data Acsuisition, and Data Analysis	1338
	L.R. Dalesio, G. Carcassi, M.A. Davidsaver, M.R. Kraimer, R. Lange, N. Malitsky, G. Shen BNL, Upton, Long Island, New York, USA T. Korhonen Paul Scherrer Institut, 5232 Villigen PSI, Switzerland J. Rowland Diamond, Oxfordshire, United Kingdom M. Sekoranja Cosylab, Ljubljana, Slovenia G.R. White SLAC, Menlo Park, California, USA
	Funding: Work supported under auspices of the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC, and in part by the DOE Contract DE-AC02-76SF00515 EPICS version 4 extends the functionality of version 3 by providing the ability to define, transport, and introspect composite data types. Version 3 provided a set of process variables and a data protocol that adequately defined scalar data along with an atomic set of attributes. While remaining backward compatible, Version 4 is able to easily expand this set with a data protocol capable of exchanging complex data types and parameterized data requests. Additionally, a group of engineers defined reference types for some applications in this environment. The goal of this work is to define a narrow interface with the minimal set of data types needed to support a distributed architecture for physics applications, data acquisition, and data analysis.
	Slides FRBHMULT06 [0.188 MB]