Author: FM Liew
Date: 09-28-06 10:11
At 20:00pm, Sept. 19, the magnetic field of super-conducting magnet at the BESIII, an upgrade of Beijing Spectrometer, reached 1.0TG, 20,000 times as that of the earth. The current intensity reached 3,368A, and the energy stored by the solenoid reached 10MJ. Tests shown that the designed requirements had been fully met, which constitutes an important milestone for the BEPC Upgrade which is underway at the CAS Institute of High Energy Physic (IHEP).
Beijing Electron Position Collider (BEPC) was built in 1988. The successful building of BEPC and its research achievement in tau-charm physics indicated that high-energy physics experiment of China occupied a significant position in the world. BESIII is an important part of the upgrade program of BEPC (BEPCII) at the tau-charm energy region with a luminosity of 1033 cm-2s-1, two orders higher than present machine.
The Super-conducting Solenoid Magnet is one of the key components for BESIII, consisting of super-conducting coil, cryo-stat, coil support and valve box, etc. It provides BESIII with an axial magnetic field of about 1.0TG and good uniformity. The magnet adopts single layer coil, using indirect cooling method to realize long-distance control of the system.
The Magnet,the biggest of its kind in China, was developed independently by IHEP scientists after three-year hard work since 2003, during which many difficulties had been overcome and key technologies developed.http://english.cas.ac.cn/Eng2003/news/detailnewsb.asp?infoNo=26212