ENERGY RAMPING IN THE BEPCII

It’s an important issue in the BEPCII synchrotron radiation for the magnet power supplies to do synchronously ramping from the injection energy 1.89GeV to 2.5GeV. The ramping of the magnet power supplies has been put into the running of the BEPCII first synchrotron radiation. A software-based synchronization of the current setting on the power supplies is achieved. This paper introduces the schemes developed to perform energy ramping in the BEPCII synchrotron ring and reports on the results of the operation carried out so far.. INTRODUCTION BEPCII [1] is the upgrade of BEPC, which will provide two rings in the existing tunnel serving high energy physics (HEP) (1.89GeV) and synchrotron radiation (SR) (2.5GeV) research. It uses a full energy linac for injection. In fact, the BEPCII has three logical rings that are called synchrotron ring (BSR), electron ring (BER), positron ring (BPR). All the power supplies (about 360) in the rings are controlled using the standard power supply controller and interface (PSC/PSI) [2] that are developed by BNL. The BEPCII commissioning started with the BSR, the BER and the BPR respectively. There are about 160 power supplies in the BSR. When the machine works for the SR, the magnet power supplies in the BSR are required to be ramped to the desired current.