ICALEPCS2013 - List of Authors (Redaelli, S.)

Paper

Title

Page

A Movement Control System for Roman Pots at the LHC

115

B. Farnham, O.O. Andreassen, I. Atanassov, J. Baechler, B. Copy, M. Deile, M. Dutour, P. Fassnacht, S. Franz, S. Jakobsen, F. Lucas Rodríguez, X. Pons, E. Radermacher, S. Ravat, F. Ravotti, S. Redaelli
CERN, Geneva, Switzerland
K.H. Hiller
DESY Zeuthen, Zeuthen, Germany

This paper describes the movement control system for detector positioning based on the Roman Pot design used by the ATLAS-ALFA and TOTEM experiments at the LHC. A key system requirement is that LHC machine protection rules are obeyed: the position is surveyed every 20ms with an accuracy of 15?m. If the detectors move too close to the beam (outside limits set by LHC Operators) the LHC interlock system is triggered to dump the beam. LHC Operators in the CERN Control Centre (CCC) drive the system via an HMI provided by a custom built Java application which uses Common Middleware (CMW) to interact with lower level components. Low-level motorization control is executed using National Instruments PXI devices. The DIM protocol provides the software interface to the PXI layer. A FESA gateway server provides a communication bridge between CMW and DIM. A cut down laboratory version of the system was built to provide a platform for verifying the integrity of the full chain, with respect to user and machine protection requirements, and validating new functionality before deploying to the LHC. The paper contains a detailed system description, test bench results and foreseen system improvements.

TUPPC111

Online Status and Settings Monitoring for the LHC Collimators

836

G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta
R.W. Aßmann, D. Jacquet, S. Redaelli, E. Veyrunes
CERN, Geneva, Switzerland

The Large Hadron Collider is equipped with 100 movable collimators. The LHC collimator control system is responsible for the accurate synchronization of around 400 axes of motion at the microsecond level, and with the precision of a few micrometres. The status and settings of the collimators can be monitored by three displays in the CERN Control Center, each providing a different viewpoint onto the system and a different level of abstraction, such as the positions in mm or beam size units. Any errors and warnings are also displayed. In this paper, the display operation is described, as well as the interaction that occurs when an operator is required to identify and understand an error in the collimator settings.

Poster TUPPC111 [2.260 MB]

TUPPC120

LHC Collimator Alignment Operational Tool

860

G. Valentino, R.W. Aßmann, S. Redaelli
CERN, Geneva, Switzerland
N.J. Sammut
University of Malta, Information and Communication Technology, Msida, Malta

Beam-based LHC collimator alignment is necessary to determine the beam centers and beam sizes at the collimator locations for various machine configurations. Fast and automatic alignment is provided through an operational tool has been developed for use in the CERN Control Center, which is described in this paper. The tool is implemented as a Java application, and acquires beam loss and collimator position data from the hardware through a middleware layer. The user interface is designed to allow for a quick transition from application start up, to selecting the required collimators for alignment and configuring the alignment parameters. The measured beam centers and sizes are then logged and displayed in different forms to help the user set up the system.

Poster TUPPC120 [2.464 MB]

THCOCB03

Fast Automatic Beam-based Alignment of the LHC Collimation System

1430

G. Valentino, R.W. Aßmann, R. Bruce, S. Jackson, S. Redaelli, B. Salvachua, D. Wollmann, C. Zamantzas
CERN, Geneva, Switzerland
N.J. Sammut
University of Malta, Information and Communication Technology, Msida, Malta

Maximum beam cleaning efficiency and LHC machine protection is provided when the collimator jaws are properly adjusted at well-defined distances from the circulating beams. The required settings for different locations around the 27 km long LHC rings are determined through beam-based collimator alignment, which uses feedback from Beam Loss Monitoring (BLM) system. After the first experience with beam, a systematic automation of the alignment procedure was performed. This paper gives an overview of the algorithms developed to speed up the alignment and reduce human errors. The experience accumulated in four years of operation, from 2010 to 2013 is reviewed.

Slides THCOCB03 [13.293 MB]

Paper	Title	Page
MOPPC025	A Movement Control System for Roman Pots at the LHC	115
	B. Farnham, O.O. Andreassen, I. Atanassov, J. Baechler, B. Copy, M. Deile, M. Dutour, P. Fassnacht, S. Franz, S. Jakobsen, F. Lucas Rodríguez, X. Pons, E. Radermacher, S. Ravat, F. Ravotti, S. Redaelli CERN, Geneva, Switzerland K.H. Hiller DESY Zeuthen, Zeuthen, Germany
	This paper describes the movement control system for detector positioning based on the Roman Pot design used by the ATLAS-ALFA and TOTEM experiments at the LHC. A key system requirement is that LHC machine protection rules are obeyed: the position is surveyed every 20ms with an accuracy of 15?m. If the detectors move too close to the beam (outside limits set by LHC Operators) the LHC interlock system is triggered to dump the beam. LHC Operators in the CERN Control Centre (CCC) drive the system via an HMI provided by a custom built Java application which uses Common Middleware (CMW) to interact with lower level components. Low-level motorization control is executed using National Instruments PXI devices. The DIM protocol provides the software interface to the PXI layer. A FESA gateway server provides a communication bridge between CMW and DIM. A cut down laboratory version of the system was built to provide a platform for verifying the integrity of the full chain, with respect to user and machine protection requirements, and validating new functionality before deploying to the LHC. The paper contains a detailed system description, test bench results and foreseen system improvements.

TUPPC111	Online Status and Settings Monitoring for the LHC Collimators	836
	G. Valentino University of Malta, Information and Communication Technology, Msida, Malta R.W. Aßmann, D. Jacquet, S. Redaelli, E. Veyrunes CERN, Geneva, Switzerland
	The Large Hadron Collider is equipped with 100 movable collimators. The LHC collimator control system is responsible for the accurate synchronization of around 400 axes of motion at the microsecond level, and with the precision of a few micrometres. The status and settings of the collimators can be monitored by three displays in the CERN Control Center, each providing a different viewpoint onto the system and a different level of abstraction, such as the positions in mm or beam size units. Any errors and warnings are also displayed. In this paper, the display operation is described, as well as the interaction that occurs when an operator is required to identify and understand an error in the collimator settings.
	Poster TUPPC111 [2.260 MB]

TUPPC120	LHC Collimator Alignment Operational Tool	860
	G. Valentino, R.W. Aßmann, S. Redaelli CERN, Geneva, Switzerland N.J. Sammut University of Malta, Information and Communication Technology, Msida, Malta
	Beam-based LHC collimator alignment is necessary to determine the beam centers and beam sizes at the collimator locations for various machine configurations. Fast and automatic alignment is provided through an operational tool has been developed for use in the CERN Control Center, which is described in this paper. The tool is implemented as a Java application, and acquires beam loss and collimator position data from the hardware through a middleware layer. The user interface is designed to allow for a quick transition from application start up, to selecting the required collimators for alignment and configuring the alignment parameters. The measured beam centers and sizes are then logged and displayed in different forms to help the user set up the system.
	Poster TUPPC120 [2.464 MB]

THCOCB03	Fast Automatic Beam-based Alignment of the LHC Collimation System	1430
	G. Valentino, R.W. Aßmann, R. Bruce, S. Jackson, S. Redaelli, B. Salvachua, D. Wollmann, C. Zamantzas CERN, Geneva, Switzerland N.J. Sammut University of Malta, Information and Communication Technology, Msida, Malta
	Maximum beam cleaning efficiency and LHC machine protection is provided when the collimator jaws are properly adjusted at well-defined distances from the circulating beams. The required settings for different locations around the 27 km long LHC rings are determined through beam-based collimator alignment, which uses feedback from Beam Loss Monitoring (BLM) system. After the first experience with beam, a systematic automation of the alignment procedure was performed. This paper gives an overview of the algorithms developed to speed up the alignment and reduce human errors. The experience accumulated in four years of operation, from 2010 to 2013 is reviewed.
	Slides THCOCB03 [13.293 MB]