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The CRB Project for MedAustron Kristian Ambrosch and Ivan De Cesaris 3 rd POCPA 23.05.2012 Ambrosch/De Cesaris WP/PO 1.

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Presentation on theme: "The CRB Project for MedAustron Kristian Ambrosch and Ivan De Cesaris 3 rd POCPA 23.05.2012 Ambrosch/De Cesaris WP/PO 1."— Presentation transcript:

1 The CRB Project for MedAustron Kristian Ambrosch and Ivan De Cesaris 3 rd POCPA Ambrosch/De Cesaris WP/PO 1

2 MedAustron - Overview The company EBG MedAustron GmbH is building, and will later operate, the MedAustron centre for ion-therapy and research in Wiener Neustadt in the County of Lower Austria. The centre comprises an accelerator facility based on a synchrotron for the delivery of protons and carbon ions to irradiation stations for cancer treatment and for clinical and non-clinical research. The centre is currently in the planning stage and is foreseen to start patient treatment in The total investment costs will be more than 160 Million – financed and secured by the Federal State of Lower Austria, the Republic of Austria and the City of Wiener Neustadt. Ambrosch/De Cesaris WP/PO 2 3 rd POCPA

3 MedAustron Overview Ambrosch/De Cesaris WP/PO 3 3 rd POCPA

4 MedAustron Overview Ambrosch/De Cesaris WP/PO 4 3 rd POCPA

5 MedAustron - Overview The MedAustron Accelerator Facility Synchrotron based Protons and Carbon ions (other ions possible in the future) Max. Energy: Proton: MeV (clinical) and < 800 MeV (for research) Carbon: MeV/n The planning/realisation of the accelerator facility is being supplied in cooperation with the European Organisation for Nuclear Research (CERN). Active beam scanning on all beam lines. Accelerator will be operated 24/7. Beam time split Treatment:Research ~50:50 Ambrosch/De Cesaris WP/PO 5 3 rd POCPA

6 Irradiation Rooms Room 1: · Horizontal beam line, protons/ions · Used by non-clinical research Room 2: · Horizontal and vertical line, protons/ions · Used for treatment and Medical Physics Room 3: · Horizontal beam line, protons/ions · Used for treatment Room 4: · Proton gantry · Used for treatment Room 5 (extension possible in phase II): · Optional ion gantry · Used for treatment Ambrosch/De Cesaris WP/PO 6 3 rd POCPA

7 Gantry: Example HIT Ambrosch/De Cesaris WP/PO 7 3 rd POCPA

8 Power aspect Total power installed Peak 16.7 MWAverage 6.7 MW Working Power LE ME MR EX T2 V2Peak 9.8MWAverage 4.3 MW 3 rd POCPA Ambrosch/De Cesaris WP/PO Compensator Harmonics cosφ

9 Topology choice 50 Hz line commutated (thyristors) Voltage swing between Ramp and Flat top => ratio 5/1 The power is controlled by adjusting the cosφ This lead to a very low power factor <0.2 Then a network compensator is compulsory Switched Mode The power is controlled by the Pulse Width Modulation on the dc/dc Converter The cosφ is >.95 and can be controlled to 1 if Active Front End is used From this aspect a network compensator is not needed The higher switching frequency improve output performance No active filter needed 3 rd POCPA Ambrosch/De Cesaris WP/PO dc Passive filter Magnet Load AFE or Passive filter Magnet Load Active filter

10 Converter control CERN FGC3 and H bridge controller PSI DPC Digital Power electronic Control system National Instrument PXI crate to house: Real time Controller, FPGA for function generator 400 MHz FPGA with few 16 bit ADC for PWM MedAustron considerations Up to 5 different converter contracts Could lead to over cost on every contract MedAustron resource needed to master each system (no support available) Standard controller preferred Clear separation of responsibilities is compulsory H bridge control shall be the responsibility of the supplier Achievement of the very high precision Only very few companies have experience Ambrosch/De Cesaris WP/PO 10 3 rd POCPA

11 Items requested 275 magnet circuits to be powered with: 5 Families of power convertersQty A: DC commercial (of the shelf) for LE and ME quad solenoid, spectrometer B: for Correctors, Quad C: for Synchrotron quad and sextupole, switching dipole, dispersion suppressor, injection and extraction septum D: 12 Scanning E: Synchrotron and 90º dipole 2 C3: Specificity for IH and Matching section Quads Control electronic modules CRB:for all converters except family A MDI:for C3 ECI:For Family E B train Ambrosch/De Cesaris WP/PO 11 3 rd POCPA

12 Capacitor discharge topology Using CERN design with adaptation transformer 4 units in production by WP PO for ITS mid May Using CERN existing control electronics 12 units plus 2 spares to be produced in collaboration with CERN TE/EPC for October Profit of a new design and production for CERN linac 4 Saving of ~600 k from previous specification which included dc between 10 Hz pulses 3 rd POCPA Ambrosch/De Cesaris WP/PO 12 Specificity subfamily c3

13 The CRB (Control Regulation Board ) 3 rd POCPA Ambrosch/De Cesaris WP/PO 13 The full standardization of the current controller insures the very high precision requirement with a single identical product. This is granted by the CERN expertise in this domain. Complementary the design of the current controller can include auto calibration feature to be applied on demand by the machine operators. The converter parameters can be loaded from a centralized data base. This will insure proper data given to the converter in case of current controller exchange. From the operation aspects, the current cycle functions shall fully comply with the requested demand, The controller structure allow for very high tracking performances. A post mortem feature recording the important signals of the converter shall also be implemented. Field control shall also be achieved by the CRB

14 Control Regulation Board Vision: One board to fit all Target: Minimize maintenance effort One Regulation Board for Power Converters Families A – D Reference Value Control System Beam Diagnostics System for the Scanning Magnet Reference Types Current Field Regulation Loop Frequencies 2 kHz 40 kHz (Scanning Magnets) Pulsed (C3) ADC Precision 10 – 100 2kHz kHz Ambrosch/De Cesaris WP/PO 14 3 rd POCPA

15 CRB Overview Ambrosch/De Cesaris WP/PO 15 3 rd POCPA

16 CRB – FPGA Functionality Handles the Input/Outputs Functionality includes Acquisition of ADC Measurements Digital ADC Filter USB Connection for Terminal Access Forwards Slow Control for Fam. B,C,D Digital Reference Output Serial Link to Interface Boards Temperature Regulation for ADC References GPIOs DAC LEDs With the exception to the Control System Interface, there are no I/Os directly connected to the DSP Ambrosch/De Cesaris WP/PO 16 3 rd POCPA

17 CRB – DSP Functionality Communication with the Control System Synchronous reception of reference values Synchronous transmission of measurements All parameters submitted by the Control System Only calibration of the ADCs stored in Flash Flashes FPGA Communication with the local terminal Full Functionality as for the Control System supported Additional real-time signal tracing Perform the regulation algorithm (RST) Data log Fault handling Ambrosch/De Cesaris WP/PO 17 3 rd POCPA

18 ADC Precision 3 rd POCPA Ambrosch/De Cesaris WP/PO 18

19 Conclusion 3 rd POCPA Ambrosch/De Cesaris WP/PO 19 CRB suitable for all Power Converter Families Separation of Functionality and IOs CRB fully parameterizable by control system Maintenance reduced to board exchange and startup Reduce MTTR to a minimum


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