ICALEPCS2013 - List of Keywords (collimation)

Paper	Title	Other Keywords	Page
MOPPC025	A Movement Control System for Roman Pots at the LHC	controls, interface, FPGA, experiment	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	status, injection, operation, monitoring	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	alignment, controls, interface, monitoring	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]

THPPC025	The Interaction between Safety Interlock and Motion Control Systems on the Dingo Radiography Instrument at the OPAL Research Reactor	controls, neutron, shielding, radiation	1141
	P.N. Barron, D. Bartlett ANSTO, Menai, Australia
	A neutron radiography/tomography instrument (Dingo) has recently been commissioned at the Bragg Institute, ANSTO. It utilizes thermal beam HB2 of the OPAL research reactor with flux up to 4.75 x 10⁷ neutrons cm^-2 s⁻¹ at the sample. One component of the instrument is a 2.5 tonne selector wheel filled with a wax/steel shielding mixture which requires complex interaction between the safety interlock and motion control systems. It provides six apertures which are equipped with various neutron beam optics plus a solid ‘shutter’ section to block the beam. A standardized Galil based motion system precisely controls the movement of the wheel while a Pilz safety PLC specifies the desired position and handles other safety aspects of the instrument. A shielded absolute SSI encoder is employed to give high accuracy feedback on the position in conjunction with a number or limit switches. This paper details the challenges of creating a motion system with inherent safety, verifying the wheel meets specifications and the considerations in selecting components to withstand high radiation environments.
	Poster THPPC025 [1.929 MB]

THCOCB03	Fast Automatic Beam-based Alignment of the LHC Collimation System	alignment, monitoring, feedback, operation	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

Other Keywords

Page

MOPPC025

A Movement Control System for Roman Pots at the LHC

controls, interface, FPGA, experiment

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

status, injection, operation, monitoring

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

alignment, controls, interface, monitoring

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]

THPPC025

The Interaction between Safety Interlock and Motion Control Systems on the Dingo Radiography Instrument at the OPAL Research Reactor

controls, neutron, shielding, radiation

1141

P.N. Barron, D. Bartlett
ANSTO, Menai, Australia

A neutron radiography/tomography instrument (Dingo) has recently been commissioned at the Bragg Institute, ANSTO. It utilizes thermal beam HB2 of the OPAL research reactor with flux up to 4.75 x 10⁷ neutrons cm^-2 s⁻¹ at the sample. One component of the instrument is a 2.5 tonne selector wheel filled with a wax/steel shielding mixture which requires complex interaction between the safety interlock and motion control systems. It provides six apertures which are equipped with various neutron beam optics plus a solid ‘shutter’ section to block the beam. A standardized Galil based motion system precisely controls the movement of the wheel while a Pilz safety PLC specifies the desired position and handles other safety aspects of the instrument. A shielded absolute SSI encoder is employed to give high accuracy feedback on the position in conjunction with a number or limit switches. This paper details the challenges of creating a motion system with inherent safety, verifying the wheel meets specifications and the considerations in selecting components to withstand high radiation environments.

Poster THPPC025 [1.929 MB]

THCOCB03

Fast Automatic Beam-based Alignment of the LHC Collimation System

alignment, monitoring, feedback, operation

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]