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！