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

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 2015.
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.
3rd POCPA
Ambrosch/De Cesaris WP/PO

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

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

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
3rd POCPA
Ambrosch/De Cesaris WP/PO

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:
· Used for treatment
Room 4:
· Proton gantry
Room 5 (extension possible in phase II):
· Optional ion gantry
3rd POCPA
Ambrosch/De Cesaris WP/PO

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

8. Power aspect Total power installed Peak 16.7 MW Average 6.7 MW
Working Power LE ME MR EX T2 V2 Peak 9.8 MW Average 4.3 MW
Compensator
Harmonics
cosφ
3rd POCPA
Ambrosch/De Cesaris WP/PO

9. Topology choice 50 Hz line commutated (thyristors) Switched Mode
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
Passive filter
Magnet Load
Active filter dc
Passive filter
Magnet Load
AFE or
3rd POCPA
Ambrosch/De Cesaris WP/PO

10. Up to 5 different converter contracts
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
3rd POCPA
Ambrosch/De Cesaris WP/PO

11. Items requested
275 magnet circuits to be powered with:
5 Families of power converters Qty
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
C3: Specificity for IH and Matching section Quads
3 Control electronic modules
CRB: for all converters except family A
MDI: for C3
ECI: For Family E
B train
3rd POCPA
Ambrosch/De Cesaris WP/PO

12. Specificity subfamily c3
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 2012.
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
3rd POCPA
Ambrosch/De Cesaris WP/PO

13. The CRB (Control Regulation Board)
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
3rd POCPA
Ambrosch/De Cesaris WP/PO

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
3rd POCPA
Ambrosch/De Cesaris WP/PO

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

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
3rd POCPA
Ambrosch/De Cesaris WP/PO

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
3rd POCPA
Ambrosch/De Cesaris WP/PO

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

19. Conclusion 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
3rd POCPA
Ambrosch/De Cesaris WP/PO