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SSRF Light Source Complex Zhao Zhentang for the SSRF Project Team. Shanghai Symposium on Intermediate Energy Light Sources Shanghai China, September 24-26,2001. Introduction Design Overview Accelerator Systems Summary. Introduction. SSRF: Shanghai Synchrotron Radiation Facility
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SSRF Light Source ComplexZhao Zhentang for the SSRF Project Team Shanghai Symposium on Intermediate Energy Light Sources Shanghai China, September 24-26,2001 • Introduction • Design Overview • Accelerator Systems • Summary
Introduction • SSRF: Shanghai Synchrotron Radiation Facility An intermediate energy 3rd SR light source • A joint proposal of CAS and SMG in 1995 • Constructing a third generation SR light source in Shanghai by CAS • SMG’s commitment: one third of estimated budget • Concept Design phase from 1995 to 1998 • Approval of the 80M Yuan R&D Program in 1998
Introduction • Two year’s R&D from Jan. 1999 to March 2001 • 41 accelerator and beamline components • The SSRF technical design • Site selection for the SSRF in 1999 • 5 candidates in Shanghai • Zhang-Jiang High-Teche Park
Beijing Shanghai
Design Overview • The Design Goals of the SSRF • A state of the art synchrotron radiation light source with high performance and cost-effectiveness • High brightness and high flux X-ray in the energy range from 0.1~40keV • High stable and high reliable as well as high flexible operation • Consideration on future upgrades and development (Top-up injection, Photo-cathode gun to enhance the Linac for FEL…)
Design Overview • The Main Design Specification of the SSRF • Beam energy: 3.5 GeV • Beam Current: 200 ~ 300 mA • Emittance: ~10 nmrad • Circumference: <400 m • Linac also for driving DUV FEL
Design Overview • The SSRF Layout • 300MeV Electron Linac • A 1Hz full energy booster • A 3.5GeV Storage Ring with 396m in circumference • Beam Lines and experimental stations
Machine Overview • Photon Brightness and Flux
Design Overview • The SSRF Storage Ring • Magnetic Lattice • 20 cells DBA structure with 10 of 5m and 10 of 7.24m straight sections. • Each DBA cell containing 2 dipole magnets, 10 quadrupoles and 7 sextupoles • High Flexibility in operation High x and hybrid x configurations Dispersion free and finite dispersion modes Emittance: 4.8~12.1nmrad
Design Overview • Dynamic Aperture Dynamic Aperture of the Low Emittance Hybrid x mode
Design Overview • Orbit Stability Issues (10% of Beam Dimensions) • Temperature control and slow dynamic orbit correction ( 0.2~0.5 0C, 1~2 s ) • Fast global orbit feedback including 40 BPMs and 38 correctors • Beam Lifetime and Collective Effects • Beam lifetime >20 hours • Vertical beam feedback for damping the resistive wall induced instability
Design Overview • The SSRF Injector • 300 MeV Electron Linac
Design Overview • Full Energy Booster
BPM BPM QD QD Pump QF SD SF STZ STX B B 6703 1900 150 130 360 420 3300 6600
Design Overview • Beam Lines in First Phase • Macromolecular Crystallography • High-Resolution Diffraction and Scattering • X-ray Absorption Fine Structure Spectroscopy • X-ray Micro-focus and Application • Medical Application • Soft X-ray Coherent Microscopy • LIGA • Infrared
Accelerator Systems • Magnet System • 40 C-Shape Straight Bending Magnets • 200 Colin-Type Quadrupols • 140 C-Shape Sextupols • Design and Construction of 3 Prototypes • Magnetic Field Measurement Systems
Quadrupole Magnet Sextupole Magnet (Made in Kelin, Shanghai) Made in CUSTC, Hefei
Quadrupole Magnet Sextupole Magnet Harmonic Contents of Integral Field Error
Accelerator Systems • Magnet Power Supply System • A SCR-Type Bending Magnet Power Supply 850A/900V (500A/100V, 1105/24hrs ) • 10 Chopper Type Power Supplies for Quadrupoles (360A/385V, 1104/24hrs ) • 14 Full PWM Bridge Converters with ZVS Mode for Sextupoles (140A/210V, 6104/24hrs ) • Design and Construction of the Prototypes
Bending Magnet Power Supply 500A/100V, 1105/24hrs
Sextupole Power Supply 储存环六极磁铁电源 140A/210V, 6104/24hrs
Accelerator Systems • Vacuum System • Machined Antechamber made of Aluminium alloy • RF Shielded Bellows • Horizontal and Vertical Photon Absorbers • Combined TSP and SIP Pumps • A In-Situ Bake Out System • Dynamic Pressure of 1ntorr, Gas Load of 1104torrl/s
Accelerator Systems • Injection System • An Eddy Current Septum and a DC Septum • 4 Ferrite Kickers With Ceramic Chambers • Design and Construction of the Prototypes • An eddy current Septum with its pulser: 60s half-sine-wave, 0.62T peak field with stability of 0.1%, 0.02%stray field on the bump orbit • A kicker magnet with its pulser: 4s half-sine-wave, 0.12T peak field, jitter < 6.5ns
Eddy Current Septum and Its Pulser 60s half-sine-wave 0.62T peak field, stability of 0.1% stray field to main field <0.02%
Kicker Magnet and Its Pulser 4s half-sine-wave 0.12T peak field jitter time < 6.5ns
Accelerator Systems • RF System • Beam Instrumentation • Control and Timing System: (EPICS-Based) • Storage Ring Girder • Electron Gun and Bunchers • Booster magnets and Stainless Steel Chamber • Beam Line Components
High Power RF System 500MHz, 150kW CW
BPM And Its Mapping System 2m resolution
Bunchers RF Power>10MW