A Video Monitoring System for SRring-8 Accelerator Tunnel M.Koderà,T.Fukui Control Group, SPring-8, JAPAN 14 March 2003, WAO2003 KEK
o Purpose ● System overview ● Example of browser ● Effect of synchrotron radiation o Summary
● We wanted to monitor the òperation states of the accelerator components. – Previous ● Only 8 monitor cameras were installèd for the radiation safety monitoring. ● It was not designed to monitor the many accelerator components inside a tunnel. – Needs of replacement ● Monitoring of components without breaking the accelerator beam operation. ex: When cooling-water pressure falls, has it leaked? ● No failure in a radiation environment.
● We constituted this system as thè web camera system. In this system, –  can display camera pictures on web browser –  and can control cameras from the web browser òf  PC and workstations. ● For the system development in the reasonable costs, –  cameras and camera servers are commercial product – The http servers are Apache httpd and Tomcat JAVA servlet with RedHat Linux.
Web camera Canon VC-C4 16x Optical Lens 1/4" CCD with 410,000 pixels RS232C pan-tilt zoom control About US$1,000 Network camera server CEC ND-VW04 NTSC video input 4ch RS232C control 2ch JPEG output 5fps 10Base-T Ethernet About US$1,800
“Real-time server” For control-room operators only Relay of server push animation from network camera servers Relay of pan-tilt & zoom control to camera “Public server” Opened for any clients in the SPring-8 Stores cached images on a local disk Dell PowerEdge 2550 PentiumIII 1GHz x 2 Image data storage (connected to the Real-time server) 18GB x 6 (hot swap x 1) with RAID5 Public server Real-time server with storage
Cameras 24 cameras are installed in the accelerator tunnel, and attached to the inner wall. Analog NTSC video data on 75 ohm cable Network camera servers 12 camera servers are installed to the 19" racks out of the acceleratok tunnel. Two cameras are connected to bne camera server. Since transmission distance was $0 long, RS-232C was converted to RS- 485.
Locating about 60m intervals to cover a 1436m accelerator circumference.
We use a Gigabit Ethernet for a backbone and Fast Ethernet for branch lines. The network between a central control room and each zone is connected by the optical fibers. le of browsersおスラ切整惹Example:Displaying on CCR partitionラ名称： ITV9A2 This is a demonstration of time-lapse displaying.スタートス
Picture pointed the water leakage area dùring the real beam operation. (a black line is imposed for highlight) A browser hard copy of repair work in cooling-water trouble shooting.胞盲サイズを笑更し、胞盲肉行が乱れたときは、脊椎胞ボタンを押してください。再有否
● Some cameras broke down during 3 weeks operation. – Electric noise? – Radiation? ● We suspected on them. ● The failure analysis of the broken camera showèd the lost data of EEPROM. Study radiation effects
All cameras have lead sheet covers with a thickness of 0.5mm for the movable part, and 1mm thickness for the base part. But, some cameras still broke down around the high-level radiation sources (crotch, absorber). We moved all the cameras away from the high-level radiation sources. The camera has been working for 6 months since then. Now, the commercial model camera can work stably in harsh environment even inside the accelerator tunnel.
● We installed the commercial camera based monitoring system with Web technology. ● The camera operation such as žœom, pan and tilt fulfills comfortable remote monitoring. ● The radiation robustness is a problem,\but suitable camera positions can be found by surveying the radiation level. ● The monitoring system is useful in trouble finding and shooting, and has been workingV in harsh environment for six months without trouble.