Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 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 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 SASE at Free Electron Lasers Źródło: xfel.eu Free electron laser light generation using Self Amplified Spontaneous Emission

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI European X-ray Free Electron Laser at DESY Źródło: xfel.eu

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI FLASH 315 m Bunch Compressor Bypass Undulators sFLASH Bunch Compressor 5 MeV150 MeV450 MeV1250 MeV Accelerating Structures Diagnostics FEL Experiments RF stations LOLA RF Gun Źródło: S. Schreiber

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI LLRF system structure and main functionality Źródło:wikipedia MSK DESY

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 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 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 LLRF system structure and main functionality Field amplitude & phase regulation 2. Cavity frequency control with piezo actuators 3. Qext regulation,

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 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 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 % completed But many features not fully commissioned Piezo actuators control system Źródło: H. Schlarb

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI Cavities and Vector Sum diagnostic

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 High beam operation study towards XFEL/ILC Źródło: H. Schlarb

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI Continues Wave linac operation Źródło: J. Sekutowicz

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 Ongoing developments – uTCA based system

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI Ongoing developments – uTCA based system

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI Źródło: H. Schlarb

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI 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 (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 Conclusions Main 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 To read..... Sth to read: - FLASH main page: - X-FEL main page: - Collaboration meeting in Cracov: - Long beam operation,

Wojciech CICHALEWSKI, DMCS_TUL, Seminarium KMiTI Thank You THANK YOU FOR YOUR ATTENTION