ICALEPCS2011 - List of Keywords (survey)

Paper	Title	Other Keywords	Page
MOPMN010	Development of a Surveillance System with Motion Detection and Self-location Capability	network, radiation, status, controls	257
	M. Tanigaki, S. Fukutani, Y. Hirai, H. Kawabe, Y. Kobayashi, Y. Kuriyama, M. Miyabe, Y. Morimoto, T. Sano, N. Sato, K. Takamiya KURRI, Osaka, Japan
	A surveillance system with the motion detection and the location measurement capability has been in development for the help of effective security control of facilities in our institute. The surveillance cameras and sensors placed around the facilities and the institute have the primary responsibility for preventing unwanted accesses to our institute, but there are some cases where additional temporary surveillance cameras are used for the subsidiary purposes. Problems in these additional surveillance cameras are the detection of such unwanted accesses and the determination of their respective locations. To eliminate such problems, we are constructing a surveillance camera system with motion detection and self-locating features based on a server-client scheme. A client, consisting of a network camera, wi-fi and GPS modules, acquires its location measured by use of GPS or the radio wave from surrounding wifi access points, then sends its location to a remote server along with the motion picture over the network. The server analyzes such information to detect the unwanted access and serves the status or alerts on a web-based interactive map for the easy access to such information. We report the current status of the development and expected applications of such self-locating system beyond this surveillance system.

WEPMU020	LHC Collimator Controls for a Safe LHC Operation	controls, injection, FPGA, operation	1104
	S. Redaelli, R.W. Assmann, M. Donzé, R. Losito, A. Masi CERN, Geneva, Switzerland
	The beam stored energy at the Large Hadron Collider (LHC) will be up to 360 MJ, to be compared with the quench limit of super-conducting magnets of a few mJ per cm³ and with the damage limit of metal of a few hundreds kJ. The LHC collimation system is designed to protect the machine against beam losses and consists of 108 collimators, 100 of which are movable, located along the 27 km long ring and in the transfer lines. Each collimator has two jaws controlled by four stepping motors to precisely adjust collimator position and angle with respect to the beam. Stepping motors have been used to ensure high position reproducibility. LVDT and resolvers have been installed to monitor in real-time at 100 Hz the jaw positions and the collimator gaps. The cleaning performance and machine protection role of the system depend critically on the accurate jaw positioning. A fully redundant survey system has been developed to ensure that the collimators dynamically follow optimum settings in all phases of the LHC operational cycle. Jaw positions and collimator gaps are interlocked against dump limits defined redundantly as functions of the time, of the beam energy and of the beta* functions that describes the focusing property of the beams. In this paper, the architectural choices that guarantee a safe LHC operation are presented. Hardware and software implementations that ensure the required reliability are described. The operational experience accumulated so far is reviewed and a detailed failure analysis that show the fulfillment of the machine protection specifications is presented.

Paper

Title

Other Keywords

Page

MOPMN010

Development of a Surveillance System with Motion Detection and Self-location Capability

network, radiation, status, controls

257

M. Tanigaki, S. Fukutani, Y. Hirai, H. Kawabe, Y. Kobayashi, Y. Kuriyama, M. Miyabe, Y. Morimoto, T. Sano, N. Sato, K. Takamiya
KURRI, Osaka, Japan

A surveillance system with the motion detection and the location measurement capability has been in development for the help of effective security control of facilities in our institute. The surveillance cameras and sensors placed around the facilities and the institute have the primary responsibility for preventing unwanted accesses to our institute, but there are some cases where additional temporary surveillance cameras are used for the subsidiary purposes. Problems in these additional surveillance cameras are the detection of such unwanted accesses and the determination of their respective locations. To eliminate such problems, we are constructing a surveillance camera system with motion detection and self-locating features based on a server-client scheme. A client, consisting of a network camera, wi-fi and GPS modules, acquires its location measured by use of GPS or the radio wave from surrounding wifi access points, then sends its location to a remote server along with the motion picture over the network. The server analyzes such information to detect the unwanted access and serves the status or alerts on a web-based interactive map for the easy access to such information. We report the current status of the development and expected applications of such self-locating system beyond this surveillance system.

WEPMU020

LHC Collimator Controls for a Safe LHC Operation

controls, injection, FPGA, operation

1104

S. Redaelli, R.W. Assmann, M. Donzé, R. Losito, A. Masi
CERN, Geneva, Switzerland

The beam stored energy at the Large Hadron Collider (LHC) will be up to 360 MJ, to be compared with the quench limit of super-conducting magnets of a few mJ per cm³ and with the damage limit of metal of a few hundreds kJ. The LHC collimation system is designed to protect the machine against beam losses and consists of 108 collimators, 100 of which are movable, located along the 27 km long ring and in the transfer lines. Each collimator has two jaws controlled by four stepping motors to precisely adjust collimator position and angle with respect to the beam. Stepping motors have been used to ensure high position reproducibility. LVDT and resolvers have been installed to monitor in real-time at 100 Hz the jaw positions and the collimator gaps. The cleaning performance and machine protection role of the system depend critically on the accurate jaw positioning. A fully redundant survey system has been developed to ensure that the collimators dynamically follow optimum settings in all phases of the LHC operational cycle. Jaw positions and collimator gaps are interlocked against dump limits defined redundantly as functions of the time, of the beam energy and of the beta* functions that describes the focusing property of the beams. In this paper, the architectural choices that guarantee a safe LHC operation are presented. Hardware and software implementations that ensure the required reliability are described. The operational experience accumulated so far is reviewed and a detailed failure analysis that show the fulfillment of the machine protection specifications is presented.