varian 250 mev sc pt

8/12/2019 Varian 250 Mev Sc Pt

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The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons:

Medical Operation of the 2nd

Machine,Production and Commissioning Status of Machines No. 3 to 7

H. Rcken, M. Abdel-Bary, E. Akcltekin, P. Budz, T. Stephani, J. Wittschen

VARIAN Medical SystemsParticle Therapy GmbHFriedrich-Ebert-Str. 1D-51429 BERGISCH GLADBACHGERMANY


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The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons:

Medical Operation of the 2nd

Machine,Production and Commissioning Status of Machines No. 3 to 7

H. Rcken, M. Abdel-Bary, E. Akcltekin, P. Budz, T. Stephani, J. Wittschen

VARIAN Medical SystemsParticle Therapy GmbHFriedrich-Ebert-Str. 1D-51429 BERGISCH GLADBACHGERMANY


4/544The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons

Lanzhou, China

and became in 2009

Varian Medical Systems Particle Therapy GmbH

Further split-ups: > RI Research Instruments GmbH> BASC Bruker Advanced Supercon GmbH

VARIAN PT ?

Former ACCEL Instruments

was acquired in 2007 by

VARIAN Medical Systems



Lanzhou, China

OUTLINE

Introduction

Operating Cyclotrons #1 and #2Patient Treatment / Uptime Statistics

Cyclotrons under Commissioning#3 Assembly, SC Magnet Ramping, Test Quench, Magnetic Field Mapping

Examples for New ComponentsSolid State Amplifier, Digital Low Level RF

Cyclotron Production Site

Production of Next Machines#4, #5, #6, #7

Cyclotron and Scanning Nozzle Test Cell

Conclusion



Lanzhou, China

Beam - Energy 250 MeV- Extracted current (max) 800 nA- Emittance of extracted beam < 3 / 5 mm mrad (2 )- Momentum spread p/p 0.04% (i.e. 200keV @ 250MeV)- Number of turns 650- Extraction efficiency (multi-turn extraction mode) ~80%- Dynamic range for intensity modulation 1:800- Fast intensity modulation via electrostatic deflector, >10% in 100 s

VARIAN PT Cyclotron System Parameters(Engineering Goals)

RF System - Frequency 72.8 MHz (2 nd harmonic)- Voltage source to puller / @ extraction radius 80 kV / 130 kV

- RF power 115 kW

Iron Yoke - Outer diameter 3.1 m- Height 1.6 m- Weight



Lanzhou, China

Operating VARIAN PT Cyclotrons #1 and #2

1. Paul Scherrer Institut PSI (CH), treating patients since beginning of 2007.

2. Rinecker Proton Therapy Center RPTC (D) treating patients since

beginning of 2009!This facility is widely equipped with VARIAN technology, like

superconducting compact 250 MeV proton cyclotrondegrader for energy adjustmentenergy selection system for energy filteringbeam line for beam transportation

4 rotational isocentric gantries for 360

irradiation+ 1 fixed beam for head / neck treatmentsdelivery nozzles providing pencil beam spot scanningsafety systems

treatment control software



Lanzhou, China

Patient Treatment at RPTC

On website

www.rptc.de :

PATIENT TREATMENTSTARTED MARCH 16 th, 2009

TREATMENT REPORTS ARE AVAILABLE

STATUS REPORTS AND

MEDICAL CASE STUDIES ARE AVAILABLE



Lanzhou, China

RPTC Uptime during Patient Treatment

RPTC presentation on

PTCOG 48 conference(specialized particletherapy event)

6 months after start of operation:

Poster presented by RPTC at PTCOG 48


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The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons

Lanzhou, China

VARIAN PT Cyclotrons under CommissioningCyclotron #3 Assembly and FAT

Cyclotron #3 will be widely pre-assembled,

tested (with beam!) in the factory,

and shipped to its destination in

2 large lots (upper / lower part).

It is currently in the final stageof assembly and is undergoingFATs in parallel.


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The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons

Lanzhou, China

VARIAN PT Cyclotrons under CommissioningCyclotron #3 Assembly and FAT

Cyclotron #3 will be widely pre-assembled,

tested (with beam!) in the factory,

and shipped to its destination in

2 large lots (upper / lower part).

It is currently in the final stageof assembly and is undergoingFATs in parallel.


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14The VARIAN 250 MeV Superconducting Compact Proton Cyclotrons

Lanzhou, China

VARIAN PT Cyclotrons under Commissioning#3 SC Magnet Ramping and Test Quench

First excitation of thesuperconducting magnet tookplace on May 18, 2010 on thefirst attempt.

The obligatory test quenchcould not be forced by fast

ramping and had to betriggered by the dedicatedquench heaters.

After cool down (5 hrs) allforces on the support links aswell as the magnetic fieldmap remained unchanged:

stable, quench proof andquench tolerant system


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A measured field map

VARIAN PT Cyclotrons under Commissioning#3 Magnetic Field Mapping

Initially the field showed afirst harmonic of ~29 Gauss.

is compared to itssymmetrized form to revealdeviations from perfect 4-foldsymmetry.

This could be compensated

Some remaining deviationson the extraction radius mustbe shimmed locally.

down to


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1 st Harmonic of Initial Field Map

29 Gauss





down to


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1 st Harmonic of Initial Field Map

29 Gauss





down to


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RF power amplifiers used at PSI and RPTC:3-stage tetrode tube based , several electrical cabinetsfor power transformers and high voltage supplies

Supplied byCryoelectra GmbH

New design is tested:transistor based , 20 parallel working RF power modulesTest setup completed a >1000h test with 25kW,

allowed reflected power limit >15%

VARIAN PT Cyclotrons under CommissioningSolid State Amplifier


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Lanzhou, China

Currently the final setup consisting of 6 cabinets with a total of 120 power

modules is under test in the factory.

VARIAN PT Cyclotrons under CommissioningSolid State Amplifier

Via its redundancy, the design features ahigher

- availability,- maintainability,- cost reduction, ...

The digitally controlled modularizedsystem provides extended diagnosticscapabilities.


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Lanzhou, China

VARIAN PT Cyclotrons under CommissioningDigital Low Level RF

VARIAN will use a digital LLRF with itsfuture systems.


The dLLRF has already passedperformance tests at the supplier andwill be delivered in September to theVARIAN factory for system integrationtests.

Like the SSAmp, the dLLRF is designedfor high redundancy. This yields a high

fault tolerance and increases systemuptime.

The dLLRF is faster than the previouslyused system and provides much morediagnostic signals and functionality.


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l d


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VARIAN PT C l P d i Si


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VARIAN PT Cyclotron Production SiteOverview

Production site nearCologne / Germany

Allows assembly ofup to 6 cyclotrons in

parallel

and up to 8 - 12

cyclotrons / year

VARIAN PT C l P d i Si


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Lanzhou, China

VARIAN PT Cyclotron Production SiteOverview

Production site nearCologne / Germany

Allows assembly ofup to 6 cyclotrons in

parallel

and up to 8 - 12

cyclotrons / year

VARIAN PT C l t P d ti Sit


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Lanzhou, China

VARIAN PT Cyclotron Production Site Assembly Stands

VARIAN PT C l t P d ti Sit


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VARIAN PT Cyclotron Production Site


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Production of Next Machines


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Production of Next Machines#4, #5, #6, #7

#4: All major componentsare ready, coil winding andassembly of pole caps is

underway#5: Fine machined ironyoke and pole caps are inthe factory underinspection

#6, #7: Iron parts and longlead items are ordered(iron is casted and forged these days)

Expected build sequenceis ~2 cyclotrons per year at

the moment

#4 coil windingpole caps

yoke rings #5 pole capsyoke rings



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Lanzhou, China

Cyclotron and Scanning Nozzle Test CellFactory Beam Test Plans

Adjacent to the manufacturing hallVARIAN has built a concrete bunkerfor cyclotron and scanning nozzle

tests, the so-called Test Cell.This enables the delivery of factorybeam tested systems.

The Test Cell is finalized this monthand cyclotron #3 will move in aftermagnetic shimming.



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y gFactory Beam Test Plans






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Factory Beam Test Plans






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We plan to test all RF components,ion source, slit systems, extractors, diagnostics, etc.

during a system integration and FAT for cyclotron #3 in this year.

Cyclotron and Scanning Nozzle Test CellF B T Pl


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We plan to test all RF components,ion source, slit systems, extractors, diagnostics, etc.

during a system integration and FAT for cyclotron #3 in this year.

VARIAN PT Superconducting Proton CyclotronsF D l


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Future Developments

The proven design

which was built in the past

will be improved continuouslyfor the VARIAN PT Cyclotronwith regard to reliability maintainability performance upgrades cost reduction

Ion Source, Solid State Amplifier,Dee Noses, Digital LLRF, Simplified Media Supply,Iron, Cryosystem, Extraction System, and so on

VARIAN PT Superconducting Proton CyclotronsF t D l t


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Future Developments

The proven design




VARIAN PT Superconducting Proton CyclotronsFuture Developments


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Future Developments

The proven design




ConclusionOperating & Future VARIAN PT Cyclotrons


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Lanzhou, China

* Iron #5 is under inspection in the factory.

* Cyclotron #3 is currently undergoing FATs.

* Cyclotron #4 parts are currently assembled in the VARIAN factory.

* Irons #6 and #7 are currently being casted and forged

Operating & Future VARIAN PT Cyclotrons

* Paul Scherrer Institute (PSI), treating patients since beginning of 2007.

* Rinecker Proton Therapy Center (RPTC), treating patients sincebeginning of 2009. Gantry #4 @RPTC is handed over right now.

* A contract for the next complete PT installation with a customer from theUSA has been signed.

* There are more projects in Europe and the USA in the pipeline.

more to come

Teams Charity Run


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Lanzhou, China

for the Childrens Cancer Ward of the University Hospital in Cologne:

Thank you!

varian 250 mev sc pt

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