SSRF Light Source Complex
Zhao Zhentang for the SSRF Project Team
Shanghai Symposium on Intermediate Energy Light SourcesShanghai 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
The SSRF Site in Shanghai
SSRF Main Building Layout
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
0. 6 300 MeV LinacDUV FEL
3.5 GeV Storage Ring
Beam Lines and Experimental Stations
Booster
Machine Overview
Photon Brightness and Flux
0.01 0.1 1 10 10010
12
1014
1016
1018
1020 Low-emittance mode with =0.01U34
W136
Bend
Normal mode with =0.1
U28 U90
W75
Brig
htne
ss [P
hoto
ns/(s-
mm
2 -mra
d2 -0
.1%
BW
)]
Photon energy (keV)
0.01 0.1 1 10 10010
11
1012
1013
1014
1015
1016
U34
W136Bend
U28
U90
W75
Spe
ctra
l Flu
x [P
hoto
ns/(
s-0.
1%
BW
)]
Photon energy (keV)
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
Energy (GeV) 3.5Circumference (m) 396Harmonic Number 660Nature Emittance (nmrad) 4.8~12.1Beam Current, Multi-Bunch (mA) Single-Bunch (mA)
200~300>5
Straight Lengths (m) 107.24, 105Betatron tunes, Qx/Qy 18.81/8.77,
22.19/8.23Momentum Compaction 6.910-4
RF Frequency (MHz) 499.654RF Voltage (MV) 4Dipole Radiation per Turn (MeV) 1.256Bunch Length (mm) 4.59Beam Lifetime (hrs) >20
Main Parameters of the SSRF Storage Ring
0 5 10 15 200
8
16
24
32
x
y
10x
La
ttic
e F
un
ctio
ns
Path Length (m)
Design Overview
Dynamic Aperture
-50 -40 -30 -20 -10 0 10 20 30 400
8
16
24
32
with errors
Without errors
dp/p=-3% dp/p=0.0 dp/p= 3%
Tracking for 1000 Turns
Y (
mm
)
x (mm)
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
Beam energy(MeV) 300Beam pulse length(ns):
Single bunch 1 Multibunch 300
Repetition rate(Hz) 1Current at exit(mA):
Single bunch 1200 Multibunch,(average in macropulse) 180
Energy spread ± 1%Beam emittance(mmmrad) 1.0Accelerating section number 11Klystron number 3Klystron output power(MW) 45Total length(m) 50
Design Overview
Design Overview
Full Energy Booster
Injection Energy ( MeV) 300Output Energy (GeV) 3.5Circumference (m) 158.40Natural Emitance (nmrad) 203 (@3.5 GeV)
Single Bunch 0.5Beam Current (mA) Multi Bunch 20Repetition Rate (Hz) 1RF Frequency (MHz) 499.654RF Voltage (MV) 2.0Energy Loss per Turn (MeV) 1.159Super period Number 3FODO Cell Number 24Cell Length (m) 6.600Betatron Tunes 7.253/4.214Synchrotron Tune 0.0219Momentum Compaction 0.02443Bunch Length (cm) 2.46
BB
QD
QD
QFS
F
SD
6703
6600
150
130
420
360
Pump ST
ZSTX
BPM
BPM
1900
3300
上海光源加速器装置
Design Overview
Beam Lines in First Phase
1. Macromolecular Crystallography
2. High-Resolution Diffraction and Scattering
3. X-ray Absorption Fine Structure Spectroscopy
4. X-ray Micro-focus and Application
5. Medical Application
6. Soft X-ray Coherent Microscopy
7. LIGA
8. 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
Bending Magnet (made in IHEP, Beijing)
- 30
- 25
- 20
- 15
- 10
- 5
0
5
- 60 - 50 - 40 - 30 - 20 - 10 0 10 20 30 40 50 60X(mm)
ΔBL/BL(1.E-4)
Quadrupole Magnet Sextupole Magnet
(Made in Kelin, Shanghai) Made in CUSTC, Hefei
Quadrupole Magnet Sextupole Magnet
Harmonic Contents of Integral Field Error
1. 2E-04
1. 0E+00
1. 7E-042. 0E-042. 2E-04
1. 0E-06
1. 0E-05
1. 0E-04
1. 0E-03
1. 0E-02
1. 0E-01
1. 0E+00
1. 0E+01
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Harmonic number n
Bn/B
2@R=
30mm
1. 3E-036. 6E-041. 1E-03
1. 0E+00
1. 0E-06
1. 0E-05
1. 0E-04
1. 0E-03
1. 0E-02
1. 0E-01
1. 0E+00
1. 0E+01
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Harmonic number n
Bn/B
3@R=
30mm
Rotating Coil Magnetic Measurement System
Magnetic Field Mapping System
Long Coil Magnetic Measurement System
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
0 200 400 600 8009.00310
9.00315
9.00320
9.00325
9.00330
9.00335
DC
CT
Êä³
öµçÑ
¹ £¨
10V
/500
A£©
¼ÆÊý
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
14
16
18
20Êä³öµçÁ÷450A
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Power Supply Stability (450A@ 2oC: < 1x10–5/24hrs)
储存环六极磁铁电源Sextupole Power Supply
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
6m Antechamber Section
Photon Absorber
RF Shielded Bellow
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
Low Level RF Control System
High Power RF System
500MHz, 150kW CW
BPM And Its Mapping System
2m resolution
Storage Ring Girder
100kV Electron Gun
上海光源加速器装置
Bunchers
RF Power>10MW
Booster Magnets
ID Front End
Metal Gate Valve and Fast Vacuum Interlock
CVD BPM at ID Front End
Long Trace Profiler
Double Crystal Monochromator
Water Cooled 4 Blade Slits
Summary
The SSRF specifications have been detailed with completion of the technical design.
The prototypes made under the R&D are qualified for formal construction by minor modification.
Detailed Design and System Integration as well as new technology development
We will start to integrate the existing components into an electron linac from this autumn.
Shanghai Synchrotron Radiation Facility
Thank you for your attention !
谢谢!