1. Gu Qiang For the project team
FEL progress in SINAP
Gu Qiang
For the project team

2. Outline The experiments at SDUV-FEL
The status of the Soft X-ray FEL Facility
The progress of the Hard X-ray FEL Facility base on X band technology

3. The experiments at SDUV-FEL
: Linac commissioning
: SASE lasing
: Seeding signal
: Echo signal (`double-peak’)
: HGHG saturation
: EEHG-FEL lasing
: HGHG continuous tunability
: Cascaded HGHG
: harmonic
: Crossed-planar undulators for polarization control
: Corrugated device operation in a FEL
: CPA of CHG (in preparation)

4. New FEL experiment layout Since 24th July, 2013

5. Scheme of Echo-10 Beam: 165-175MeV, ~200 pC, 3~8ps
Seed laser 1: 523 nm, 8.7 ps (FWHM), 60 J
Seed laser 2: 2500 nm, ~100 fs (FWHM), 40 J
Radiator: 40mm*80 periods, with variable gap.
Output wavelength: 800 nm-200nm.
The echo signal occurs at the wave number: kEEHG=nk1+mk2, n and m are integers.

6. Echo-10 data
The central wavelength of HGHG and EEHG will be different because wavelengths of two seed lasers are different:

7. Polarization control with crossed-planar undulators
K. J. Kim, Y. Ding, Z. Huang, Y. H. Li, B. Faatz, W. Decking, H. Geng et al
Arbitrary Polarization state
> kHz Polarization switch rate
High Polarization degree

8. Modulator (EMU65)
Period Length [m]
0.065
Undulator Peak Field [Gs]
~ 2700
Period Number 10
Undulator Parameter
~ 1.16
Crossed Planar Undulators
0.05
10000 ~ 2100
~ 0.68
Seed Laser System
Wavelength [nm]
1047
Time Duration (FWHM) [ps]
~ 8.0
Peak Power [MW]
~ 10
Rayleigh Length [m]
~ 3.0
Phase Shifter
Total Length [m]
~ 0.4
Shift Range
0 ~ 2π
T. Zhang, H. X. Deng*, J. H. Chen et al., Nucl. Instr. and Meth. A 680, 112 (2012)

9. H. X. Deng, T. Zhang, L. Feng et al. , Phys. Rev. ST Accel
H. X. Deng, T. Zhang, L. Feng et al., Phys. Rev. ST Accel. Beams 17, (2014).

10. Corrugated structure for beam linearizer
Material
Aluminum
depth δ
2.0mm
corrugated width g
0.3mm
period p
0.6mm
length
300mm
width
30mm
Q Gu, et. al., TUPB022, LINAC 2012

11. Blue：corrugated structure open, Red：corrugated structure closed (2mm separation)
Central wavelength: 8nm redshift, FEL bandwidth: 7.34nm  3.75nm
H. X. Deng, M. Zhang, C. Feng et al., Phys. Rev. Lett 113 (2014)

13. Summary
SDUV-FEL is one of the most competitive test FEL facilities, on which several FEL experiments have been accomplished recently.
10th harmonic of EEHG.
First demonstration of polarization switching using crossed-planar undulators in a FEL facility.
First corrugated beam linearizer operated in a FEL facility.
CPA of CHG in preparation.
The experiment results agree well with simulations, which confirms the corresponding theories for FEL improvement.
New experiments are on the way.

14. Shanghai X-ray FEL 2014.12, Ground breaking 2015.12, Build ready
2016.2, Utilities ready
2016.6, Installation finished
2017.6, Lasing
, Acceptance

15. Layout and key parameters of SXFEL
Nominal
Upgrade
Unit
Output Wavelength
8.8nm 3 nm
Output FEL Power
 100 MW
FEL pulse length fs
Bunch charge
0.5 nC
Energy
0.84
1.2~1.3
GeV
Energy spread
<0.15%
Normalized emittance
2.5
~2.5
mm.mrad
Pulse length (FWHM)
1.0 ps
Peak current kA
Rep. rate 10 Hz

20. Summary
The ground breaking of the SXFEL facility was hold on 30th Dec., 2014.
Lasing should be achieved in 2017.
The progress of the key technology and components inspired the confidence in construction and commissioning.
The facility could be a user facility at 3nm with minor upgrade in future.

21. Hard X-ray FEL based on X band technology
We joined the R&D of the CLIC-FEL collaboration and the X band technology collaboration.
We hope to propose a compact hard X-ray FEL base on X band technology for the future light source in China.

22. Tolerance budget study
tols.err = [ 0.05 % inj_arr ps 2 % inj_dQ % 0.05 % L1_pha deg 0.02 % L1_volt % 0.05 % Lx_pha deg 0.02 % Lx_volt % 0.05 % L2_pha deg 0.02 % L2_volt % 0.05 % L3_pha deg 0.02 % L3_volt % % BC1_dR % BC2_dR56 ];
dE(0.02%)
dI(10%)
dt(20fs)
inj_arr
inj_dQ
L1_pha
L1_volt
Lx_pha
Lx_volt
L2_pha
L2_volt
L3_pha
1.58E-05
L3_volt
6.33E-06
BC1_dR56
BC2_dR56
total

23. Preliminary design of the linac
18MV/m
0deg
39.7MV/m
180deg
100MV/m
30deg
25MV/m
-18.4deg
-60mm
80MV/m
-7.2deg
-11mm
80MV/m, 10deg
1.5m,
0.005GeV
0.1%
25A
17m,
0.132GeV
0.13%
42m,
0.521GeV
1.38%
54m,
0.521GeV
1.38%
500A
92m,
2.01GeV
0.347%
105m,
2.01GeV
0.347%
3000A
175m,
6GeV
0.009%
3000A
Gun
L0(s)
L1(s) X
BC1
L2(x)
BC2
L3(x)
RF-Gun
S-band L0 L1 L2
X-band L3 Lx
unit
No. of RF sect. 1 2 6 10 28
frequency
2.856
11.424
GHz
Kly. power 50 80 MW
TWS/kly.
Gradient
120 18 25 40
MV/m
SLED No
Yes

25. Consideration on undulators
Period
Gap U1
30mm
10~30 mm U2
14mm
2~10 mm U3
10mm

26. SASE with 6.4 GeV (U3, with tapering)

27. Summary
1D tracking and the tolerance budget have been studied. The baseline of the linac has been established and 6D tracking has been done.
Study on the FEL radiator started and the first S2E simulation has been done.
Optimization of the linac and FEL radiator should be studied in the future.