|
 The
BEPCII storage ring started its second commissioning run on Oct. 24,
2007, with the superconducting quadrupoles installed in the interaction
region. After the various parameters of the two rings being measured and
optimized, the electron and positron beams collided successfully on Nov.
18, 2007, with the collision beam currents of 5.2 mA * 5.2 mA. As a
milestone of the commissioning, it was the first time for the BEPCII to
collide at the designed vertical beta function of 1.5 cm at the IP. It
also means that the manufacture and upgrade of the equipment on the
storage rings go to the end. All the key facilities satisfy the
requirement of operation, with their designed specifications reached. |
