The Shanghai Synchrotron Radiation Facility (SSRF) accelerator complex consists of a linear accelerator (Linac), two synchrotrons (i.e. a booster and a storage ring), a low·energy beam transport line (LTB) and a high·energy beam transport line (HTB).
The linear accelerator (Linac) is used as an injector for the booster.The electrons generated by an electron gun are accelerated by 4 travelling wave RF tubes to 150 MeV, then injects electron beam into the booster via the low·energy beam transport line.
The SSRF booster is an electron synchrotron with a circumference of 180 meters that accelerates electrons from the energy of 150 MeV to 3.5 GeV. After extraction from the booster, the electrons are guided to a high energy transfer line towards the storage ring.
The SSRF storage ring with a circumference of 432 meters. The storage ring is composed of 20 double bend achromat (DBA) lattice cells with the total of 16 standard straight sections in 6.5 meters each and four long straight sections in 12 meters each. Two of the long straight sections have been used for accommodating injection elements and for installing superconducting RF system respectively. The synchrotron radiation to beamlines is produced by IDs which are installed in each of the remaining 18 straight sections. There is no further effects by the storage ring to increase the energy of the electron beam, however it can accumulate and store the beam current, meanwhile compensate for the beam energy loss by synchrotron radiation. The electron beam circulates in the storage ring at a constant energy, continuously passing through the bending dipole magnets and IDs, simultaneously providing accurate and stable synchrotron radiation to the beamlines. With precise design and continuous improvement, the focusing structure of the SSRF storage ring has reduced the beam emittance to 3.9-4.2nm·rad. At a beam current up to 300 mA, the maximum brightness of the x-rays provided by the high-performance undulator can be over 1020 photons/( S·mm2·mrad2·0.1% BW), and the maximum flux of the x-rays provided by the wiggler can be close to 1016 photons/(S·0.1%BW).
