  HLS (Hefei Light Source) is a second generation synchrotron radiation source.
After injected into the storage ring at energy of 200MeV, the electrons will be
ramped to 800MeV. During ramping, the magnetic fields of the bend, quadruple
and sextuple magnets are ramped up synchronously to keep the working point of
the storage ring unchanged. This process is carefully controlled by HLS control
system, which is built under EPICS. Several measures are taken to insure the
synchronization and linearity of the ramping.
