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LLRF at SSRF
2017.10.16
Yubin Zhao
contents
• SSRF RF operation status
• Proton therapy LLRF
• Third harmonic cavity LLRF
• Three LINAC LLRF
• Hard X FEL LLRF (future project )
Trip statistics of RF system
Storage Ring RF
Three CESR type cavities
Booster RF
Two five-cell normal cavities
Trip times
Trip hours(h)
Proton Therapy LLRF (1)
Status:
Energy have been arrived 250MeV
Optimize the parameters of 70MeV, 250MeV and extraction
The treatment system isn’t installed
Proton accelerator layout LLRF remote GUI
8000 point look up table:
Frequency ramp
Amplitude ramp
Phase complement
,
Proton Therapy LLRF （2）
Parameters:
1. Frequency: 1.4~7.5MHz
2. Finemet Cavity, Q ~ 0.5
3. SSA:10kW 1.4~7.5MHz
4. Include second and third
harmonic frequency
acceleration
5. Accelerate voltage: 2kV
FPGA SSA Finemet Cavity
CPCI Platform
Ethernet
Combiner
DAC
DAC
DAC
Base-frequency
S-H-frequency
T-H-frequency
ADC
DDS
Clock distribution
Clock
Clock1.4MHz~7.5MHz
SG
Trigger in
Proton Therapy LLRF (3)
Amplitude and phase
response from 1.4MHz to
7.8MHz
Amplitude and phase stability：
+/-1%，+/-1 Degree Local GUI
test
Harmonic cavity in SSRF
In Shanghai Synchrotron Radiation facility (SSRF), A passive third harmonic cavity will be used to increase Touschek lifetime.
SSRF
Preliminary design
harmonic RF system
Front-end sampling module
Digital processing
module
Tuner control module
To control the voltage of harmonic cavity, a tuned loop control system will be designed for it.
LLRF for Harmonic cavity (1)
Third Harmonic SC control block
A. The hardware will same as our third generation LLRF
B. Detect the amplitude of cavity and beam current
From SGLLRF controller 1.5GHz SC
Motor driver
Piezo driverCPCI
Platform
500MHz
Ethernet
Beam current
LLRF for Harmonic cavity (2)
SXFEL(Soft-X Free Electron Laser) Installed at 11/2016, Under RF conditioning
Including 4 Sets of S-Band (2856MHz), 7 Sets of C-Band (5712MHz), 1 Set of X-Band(11424MHz)
DCLS(Dalian Coherent Light Source), Installed at 07/2016
Including 4 Sets of S-Band Ultrafast Electron Diffraction and Microscopy at
Shanghai Jiaotong University, Installed at 05/2017
Including 1 Set of S-Band 1 Set of C-Band
LINAC LLRF(1)
-By microwave group
Three project: SXFEL DCLS UEDM
LLRF of C-Band
5712MHz
Two sets of LLRF cards are installed in one MTCA chassis to drive two amplifiers.
The LLRF cabinet is one water-cooled, temperature-controlled rack, whose temperature
stability is ±0.1º.
Reference
signal
Trigger
LO & CLK
MTCA
Chassis
Solid State
Amplifier
LLRF Cabinet
RTM-DWV8VM1HF
SIS8300LCPU
AMC Backplane
AMC
RTM
To OPI
MTCA4.0
MCHPower Unit
Trigger
Clock & LORfref
SSA
RTM-DWV8VM1HF
SIS8300LA0 A1 A2
Load
Klystron
SSA Klystron
A3
Load
Load Load Load Load
Modulator
Modulator
REF
LO
CLK
SLED
SLED
LLRF architecture
SIS8300L2+
DWC8VM1(HF)
LINAC LLRF(2)
-By microwave group
Ultrafast Electron Diffraction and Microscopy
Amplitude and phase stability: 0.06%(rms), 0.03º(rms)
DCLS
Amplitude and phase stability: 0.06%(rms), 0.09º(rms)
The results
Energy: 285.47MeV,
Energy Spread: 0.029%
Energy: 3.06MeV,
Energy stability: 0.05%
Energy spread: 0.06%
-By microwave group
LINAC LLRF(3)
Soft-X FEL is under testing
Hard X FEL project introduction and LLRF
Hard X FEL parameters
Beam current: 0.2mA
Beam energy: 8GeV
CW mode operation, bunches up to 1MHz
TTF type cavity
Hard X FEL Schedule
Begin at end of 2017，finished 2024
• Tunnel construction： 2017-2020
• Utility： 2019-2021
• Key technique and prototype manufactured：2017-2021
• Main device manufactured： 2018-2023
• Device installed and integrated： 2021-2023
• commissioning： 2022-2024
Approved in 2017.4
Hard X FEL
0 m 1400 m 1900 m 2300 m 3100 m
SC linac undulator beamline
Exp. Hall
Long beamline
Far Hall Switchyard dumps Gun
Injector
Charge quantity（pC） 100
energy（MeV） 100
bunch length（FWHM，ps） 8
Emittance RMS（mm-mrad） 0.39
Delta Energy RMS 0.14%
SC LINAC
Gun L0 L1 HL BC1 L2 BC2 L3 LH
cryomodule S-cavities Beam energy(MeV)
L0 1 8 100
L1 2 16 306
HL 2 16 250
BC1 - - 250
L2 12 96 1600
BC2 - - 1600
L3 60 480 8800
total 75+2 600+16
Beam distribution
LINAC Tunnel
#2 shaft
Undulator Tunnel
Vertical Kicker
20keV SS 8keV SS
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
Undulator
12keV SS 4keV SS
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
FEL-I
FEL-II
FEL-III
SC LINAC RF Architecture
From SGLLRF controller SSA Circulator 1.3GHz SC
Motor driver
Piezo driverATCA
Platform
1.3GHz OR LO
Motor driver coupler
Ethernet
Phase Reference
Timing
SG
Single SSA, Single Cavity
SSA:5.2kW@1.3GHz, 2kW@3.9GHz
LLRF boards
PCI-E
RF front-end4 Down-converter CH
1 Up-converter CH
DSP Board
back Board Power supplyconnector
RTM BoardOutput Piezo control signalOutput motor control signal (2)
AMC Or FMC
FPGA8G Bits memory1000M Ethernet
Digital I/O INRF signal IN
Other analog voltage I/O
RF Board
ATCA Board
LLRF signal flow
Mixer AMP Filter1.3GHz
1.32GHz
Mixer AMP Filter
1.32GHz
Mixer AMP Filter
1.32GHz
Mixer AMP Filter
1.32GHz
1.3GHz
1.3GHz
1.3GHz
Mixer AMP Filter
1.32GHz
20MHz
20MHz
20MHz
20MHz
20MHz
1.3GHz
To ADC
To SSA
From reference
Pick-up signal
Forward signal
Reflect signal
< 0dBm
< 0dBm
< 0dBm
< 0dBm
0< dBm
>10dBm
>10dBm
>10dBm
>10dBm
>12dBm
Variable Att
Variable Att
Variable Att
Variable Att
Variable Att
Control signal
Control signal
Control signal
Control signal
Control signal
To ADC
To ADC
To ADC
Down-converter
ADC
FPGA
ATCA Platform
DAC
Down-converter
ADC
Down-converter
ADC
Down-converter
ADC
Reference signal
Cavity signal
Forward signal
Reverse signal
slow speed DAC output to drive piezo
8 channel Optocouplers I/O to drive the step motor
Phase detect between cavity and RF reference
Cavity voltage setting to Quench detector
other Digital I/O
Up-converter SSA cavity
Pick-up
Circulator
RF Front-end
LLRF signal flow and interface
One cryomodule and RF layout
lateral view front view
Thanks！
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