wojciech cichalewski, dmcs_tul, seminarium kmiti 20.06.2011 llrf in fel system sterowania...
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Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
LLRF in FEL
System sterowania parametrami fali stojącej z zakresu częstotliwości mikrofalowych w akceleratorach liniowych
laserów na swobodnych elektronach
W. Cichalewski w imieniu grupy zaangażowanej w projekty FLASH/XFEL
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 2
Outline- FEL at DESY
• Free Electron Lasers principles,
• FLASH/XFEL in numbers,
- LLRF system structure and main functionality,
- Cavities operation principles, cavity models,
- Best cavity frequency tuning methods in presence of LFD and microphonics,
- Fast feedbacks design and implementation in LLRF,
- Vector sum control of single and set of modules for FLASH, XFEL, ILC,
- High current beam operation,
- Electron beam acceleration: LLRF control and beam optics adjustment,
- FEL operation procedures for different experiments requirements,
- Beam based feedbacks based on toroid, Beam Arrival Monitor, Beam Position Monitors, and synchrotron radiation detectors signals,
- Global Optical synchronization system description for FLASH and XFEL
- LLRF system at FLASH – current status,
- Accelerator ambient radiation vs. performance of the accelerator electronics,
- Conclusions...
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 3
Outline
- FEL at DESY• Free Electron Lasers principles,• FLASH/XFEL in numbers,
- LLRF system structure and main functionality,
- LLRF system at FLASH – current status,- Area of DMCS main activities,- Future (next day, week, month, year....)- Conclusions...
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 4
SASE at Free Electron Lasers
Źródło: xfel.eu
Free electron laser light generation using Self Amplified Spontaneous Emission
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 5
European X-ray Free Electron Laser at DESY
Źródło: xfel.eu
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 6
FLASH
315 m
Bunch Compressor
Bypass
UndulatorssFLASH
Bunch Compressor
5 MeV 150 MeV 450 MeV 1250 MeV
Accelerating StructuresDiagnostics
FEL Experiments
RF stations
LOLARF Gun
Źródło: S. Schreiber
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 7
LLRF system structure and main functionality
Źródło:wikipedia MSK DESY
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 8
LLRF system structure and main functionality
Mission:
Generate RF signal for supplying superconducting cavities in cryomodules,
Optimize RF signal parameters (accelerating field amplitude and phase with respect to the electron beam) according to requested beam acceleration conditions
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 9
LLRF system functionality (POV beam operation)
Major issues: Fast feedbacks for field parameters regulation (PID, MIMO, ...) Adaptive algorithms for repetitive errors influence minimization Beam loading compensation, Loop gain and loop phase adjustment, HPAC nonlinearites compensation, Cavities resonance frequency control (piezo-based frequency
regulation), Interfacing to beam based feedbacks,
Additional tasks Modulations imperfections identification and compensation, Calibration of HF signals drifts,
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 10
MSK group and DMCS cooperation areas
DMCS and DESY cooperation:
Most of above mentioned LLRF related topics for FLASH, BBF design and implementation, System radiation measurement, Hardware/Software design and test of uTCA based system
for FLASH and XFEL, Continuous wave FEL operation (new), Optical synchronization system (new), Line detector for intra-bunch feedback (new).
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 11
LLRF system structure and main functionality
1
23
1. Field amplitude & phase regulation 2. Cavity frequency control with piezo actuators3. Qext regulation,
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 12
LLRF system structure main hardware components
Upconversion:- Vector Modulator, - up-converter,
Downconversion:- Downconverters,- direct sampling
Field parameters control: - filtering- realization of feedback algorithms, - realization of slow adaptive algorithms, - modulation imperfections reduction,- microwave ampl. nonlinearities compensation.
Digital to analog conversion
Signal discretization:- sampling,- averaging,- I/Q detection...
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 13
LLRF hardware systems at FLASH
Źródło: H. Schlarb
10 Channel 14bit ADCs
81 MHz clock rate
8 DAC, 14 bits
2 Gigalinks
FPGA: XILINX Virtex II pro
DSP processor TS
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 14
Piezo drivers- new driver for ACC1 / ACC7- DAQ server for detuning measurements- Several piezo studies performed- Active compensation of ringing- DC voltage added for static detuning
Control software ~ 80 % completedBut many features not fully commissioned
Piezo actuators control system
Źródło: H. Schlarb
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 15
Cavities and Vector Sum diagnostic
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 16
Beam Based Feedback implementation
Beam signals integrated- Charge signals- Bunch Arrival time- Pyro signal- Real time FB with matrix- Limiter on Ampl/Phase corr.- IIRF filters- Rep. rate adaption- Charge scaling of beam load
compensation table
Control software ~ 90 % completed
Most of features are commissioned
Źródło: H. Schlarb
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
High beam operation study towards XFEL/ILC
Źródło: H. Schlarb
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
Continues Wave linac operation
Źródło: J. Sekutowicz
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 19
Ongoing developments – ATCA system
New standards under development for telecomunication purposes:
Advanced/Micro Telecommunications Computing Architecture
Main goal:
Build modular, scalable control system suitable for FLASH/ XFEL modules control that follows current telecomunication standards and offers maximal system availability.
ATCA based system development for two years resulted in:
- hardware prototypes has been designed and lab tested (field controller, piezo controller),
- software preparation,
- no meaningful LLRF system operation in accelerator, but:
- experience gained – needed for new uTCA based system development,
- new project ITER.
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
Ongoing developments – uTCA based system
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
Ongoing developments – uTCA based system
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011
Źródło: H. Schlarb
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 23
Future (next week, month, year....)
Next weeks:- debugging of controller board,
- production and debugging of Vector Modulator board,
- firmware download software commissioning,
- front-end server preparation for LLRF controller
- CW operation at CMTB,
Next month:- first uTCA based system measurements at FLASH - KW 30-31(hardware and software has to be debugged by that time),
- installation of uTCA based architecture in different FLASH modules,
- CW operation at CMTB,
Next year:
….....
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 24
ConclusionsMain collaboration fields:- design, implementation and commissioning of software for:
- accelerating modules field parameters control,
- beam operation,
- high level control algorithms for system parameters optimization and beam operation ,
- diagnostic of individual cavity and overall system performance,
- fast cavity frequency control,
- Beam based feedbacks,
- optical system synchronization,
- design, implementation and commissioning of hardware for:- piezo control,
- line detectors,
- realization of different controllers,
- different experiments hardware set-up, software preparation and operation support.
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 25
To read.....
Sth to read:
- FLASH main page: http://Flash.desy.de
- X-FEL main page: http://xfel.eu
- Collaboration meeting in Cracov:
https://indico.desy.de/conferenceTimeTable.py?confId=4086#20110418
- Long beam operation,
https://indico.desy.de/conferenceOtherViews.py?view=standard&confId=3007
Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 20.06.2011 26
Thank You
THANK YOU FOR YOUR ATTENTION