BESIII Mechanical System Passed Pre-Acceptance

2005-06-13

　　
　　On June 7, 2005, Beijing Spectrometer III (BESIII) Mechanical System passed pre-acceptance in Luoyang, Henan Province, China. The system, was designed by the Center for Experimental Physics, Center of IHEP, and was manufactured by Citic Heavy Machinery Co. Ltd,. The company was also responsible for the installment, commissioning, test and assembling of the system. The pre-acceptance appraisal group undertook re-test and held that has met with all the technical specifications after repeated tests.achieved the designed value, could satisfy the demands of use.

　　The newly-built mechanical structure of BESIII, 11 meters long, 6 meters wide with a height of 6.5 meters and a weight of 650 tons, is composed of the base, barrel yoke, end yoke and its moving structure, supporting structure for BESIII sub-detectors. The system, being the base and the main structure for BESIII, provides magnetic flux return for the 10, 000 Gauss super-conducting magnetic system and constitutes the supporting structure for the positioning, connecting and adjusting of the sub-detectors, and at the same time being the absorber for muon detector. The positioning precision and stability of the system will be the basis for the stable operation of the BESIII sub-detectors.

　　The acceptance is a good piece of news, we have confidence that the success of the BES III mechanical system will lead to the success of the whole BESIII spectrometer.

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