the crb project for medaustron kristian ambrosch and ivan de cesaris 3 rd pocpa 23.05.2012...

The CRB Project for MedAustron

Kristian Ambrosch and Ivan De Cesaris

3rd POCPA 23.05.2012 Ambrosch/De Cesaris WP/PO1

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.

Ambrosch/De Cesaris WP/PO2

3rd POCPA 23.05.2012

MedAustron Overview


3rd POCPA 23.05.2012

MedAustron - OverviewThe MedAustron Accelerator Facility• Synchrotron based• Protons and Carbon ions (other ions possible in the future)

• Max. Energy:• Proton: 60-250 MeV (clinical) and < 800 MeV (for research)• Carbon: 120-400 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 23.05.2012

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


3rd POCPA 23.05.2012

Gantry: Example HIT


3rd POCPA 23.05.2012

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

3rd POCPA 23.05.20128

Ambrosch/De Cesaris WP/PO

CompensatorHarmonics

cosφ

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

3rd POCPA 23.05.20129

Ambrosch/De Cesaris WP/PO

dc

dcPassive

filterMagnet

LoadAFE or

Passive filter

MagnetLoad

Active filter

10

Converter control

• CERNFGC3 and H bridge controller

• PSI

DPC Digital Power electronic Control system

• National InstrumentPXI crate to house: Real time Controller, FPGA for function generator

400 MHz FPGA with few 16 bit ADC for PWM

MedAustron considerationsUp 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 precisionOnly very few companies have experience

Ambrosch/De Cesaris WP/PO3rd POCPA 23.05.2012

11

Items requested275 magnet circuits to be powered with:5 Families of power converters Qty

A: DC commercial (of the shelf) for LE and ME quad 35 + 4solenoid, spectrometer

B: for Correctors, Quad 195+19

C: for Synchrotron quad and sextupole, switching dipole, 17 + 4 dispersion suppressor, injection and extraction

septum

D: 12 Scanning 10 + 2

E: Synchrotron and 90º dipole 2C3: Specificity for IH and Matching section Quads 16 +

2

3 Control electronic modules CRB: for all converters except family AMDI: for C3ECI: For Family E

B train

Ambrosch/De Cesaris WP/PO3rd POCPA 23.05.2012

• 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


Load

Is

Up Us

Load

L

R

Specificity subfamily c3

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

Control Regulation Board

Vision: One board to fit allTarget: 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 ppm @ 2kHz• 100 ppm @ 40 kHz


3rd POCPA 23.05.2012

CRB Overview


3rd POCPA 23.05.2012

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 23.05.2012

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 23.05.2012

ADC Precision


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

the crb project for medaustron kristian ambrosch and ivan de cesaris 3 rd pocpa 23.05.2012...

Documents

rd pocpa

medaustron centre

treatment room

cern design

specificity subfamily

nuclear research cern

converter control cern

power aspect total power