At 20:00pm, September 19th 2006, the magnetic field of the BESIII super-conducting magnet reached 1.0TG, 20,000 times as that of the earth. The current intensity reached 3368A, 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.

　　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 was developed independently by IHEP and is the biggest of its kind in our country. It had taken about three years since 2003, during which many difficulties and key technologies had been overcome and developed.