FFAG 2007

12 avr. 2007, 08:00 → 17 avr. 2007, 18:20 Europe/Paris

Maison des magistères - CNRS Grenoble

Semi-annual international workshop on FFAG

jeu. 12 avril

Registration

Welcome (S. Kox, F. Méot)

From François Méot and Serge Kox, director of LPSC.

FFAG projects status and overview: EMMA (N. Bliss - CCLRC)

1 EMMA status

Exhaustive description of the EMMA project.

Orateur: Dr Neil Bliss (CCLRC)

Slides EMMA-Neil-Bliss-FFAG-2007.pdf

FFAG projects status and overview: PRISM (Y. Arimoto - Osaka Univ.)

2 Status and overview of PRISM-FFAG ring

A PRISM-FFAG ring is one of the key component in PRISM (Phase Rotated Intense Slow Muon) project which aims at searching for a charged-lepton-flavor-violation process beyond the Standard Model. At the FFAG ring, energy-spread of muon beam is made narrower by a phase-rotation technique with RF field. A lattice design, a construction of large-aperture magnets and a development of a high-gradient RF cavity have been done since 2003. Here, overview and status about the PRISM-FFAG ring are presented.

Orateur: Dr Yasushi Arimoto (Osaka U.)

Slides 070412-ffag07cnrs-arimoto.pdf

10:00 Coffee break

FFAG projects status and overview: FFAG projects in Japan (Y. Mori - KURRI Inst.)

3 FFAG projects in Japan

Orateur: Prof. Yoshiharu MORI (Kyoto University, Research Reactor Institute)

Slides FFAGs_in_Japan.pdf

FFAG projects status and overview: RACCAM (F. Méot - LPSC)

4 RACCAM

Orateur: Dr François Méot (LPSC-CNRS)

Slides FFAG2007_MEOT.pdf

12:00 Lunch

Working groups sessions

5 Meditations on End Fields

I discuss some important considerations for end field representations. In particular, I consider transverse symmetries of the end fields, the use of vector potentials vs. scalar potentials, the use of Enge functions to represent the field, and the accuracy of the hard edge limit.

Orateur: Dr Joseph Scott Berg (Brookhaven National Laboratory)

Slides Berg_070412.pdf

6 Sector Magnets – edge effect an exercise with the Polymorphic Tracking Code [PTC]

Using the sector magnet wedges improves focusing in the vertical plane, reduces orbit offsets and tune variations of the non-scaling FFAG. There is a problem in a correct treatment of the wedge effect in the combined function magnets in the existing accelerator physics codes. To eliminate potential problems of the sector magnet with wedges a new magnet without wedges is constructed but using new bending angle. Comparisons between of these two kinds of sector magnets used in the non-scaling FFAG lattice are described.

Orateur: Dr Dejan Trbojevic (Brookhaven National Laboratory)

Slides Wedge_effect.ppt

7 Quadrupole asymetric fringe field

Orateur: Dr Shane KOSCIELNIAK (TRIUMF)

Slides

• DipoleFringeFieldRotateLS.pdf
• QuadrupoleAsymmetric2.pdf
• QuadrupoleAsymmetric4.pdf
• QuadrupoleAsymmetricBx28.pdf
• QuadrupoleAsymmetricBy15.pdf
• QuadrupoleAsymmetricBy36.pdf
• QuadrupoleAsymmetricBy37.pdf
• QuadrupoleAsymmetricBz12.pdf
• QuadrupoleFringeRevisedLS.pdf
• QuadrupoleLargeAmplitudeLS.pdf

8 Potential of cyclotrons

Orateur: Dr Werner Joho (PSI)

Slides FFAG_Cyclo.ppt

ven. 13 avril

Technology for FFAG accelerators: EMMA magnetic systems (B. Shepherd - CCLRC)

slides FFAG07_ohmori.ppt

9 EMMA magnetic systems

Orateur: Ben Shepherd (CCLRC Daresbury Laboratory)

Slides FFAG07_talk.ppt

Technology for FFAG accelerators: EMMA RF (C. Beard - CCLRC)

slides FFAG07_ohmori.ppt

10 EMMA RF

Orateur: M. Carl Beard (ASTeC, Daresbury Laboratory)

Slides EMMA_RF_Systems_Update4_08-04-7_-_FINALVERSION.ppt

Technology for FFAG accelerators: Field measurement of PRISM-FFAG magnets (Y. Arimoto - Osaka Univ.)

slides FFAG07_ohmori.ppt

11 Field measurment of PRISM-FFAG magnets

Scaling FFAG magnets for PRISM-FFAG ring have been designed and constructed. The magnets have a large aperture of 1000 mm in horizontal and 300 mm in vertical. Measurement of magnetic field has been done for the three magnets. Here, the measurement results will be presented.

Orateur: Dr Yasushi Arimoto (Osaka U.)

Slides 070413-ffag07cnrs-magnet-arimoto.pdf

10:30 Coffee break

Technology for FFAG accelerators: RACCAM magnet (D. Neuvéglise/Th. Planche - SigmaPhi)

slides FFAG07_ohmori.ppt

12 RACCAM magnet design

Orateur: M. Thomas Planche (SIGMAPHI)

Slides SIG_FFAGWorkShop_Gre2007.pdf

Technology for FFAG accelerators: Coil shapping S-FFAG magnets (E. Froidefond/B. Autin - LPSC)

slides FFAG07_ohmori.ppt

13 Coil shaping magnet desgin

In the frame of the RACCAM project, the coil shaping magnet design is studied. The main advantages of that method are to allow to keep horizontal tune constant and make possible the variation of k. A first simple model of conductors of infinite length and no iron yoke gives a first set of current intensities using Biot and Savart law. The problem is then to solve the linear system A.x-B=0. The matrix A generated is often ill-conditionned and requires a particular solving method based on matrix 1-norm minimisation. It can give satisfying results in 2d, but current intensities have to be adjusted if the geometry generates an ill-conditionned matrix A. With a 3d simulation (not done yet) other adjustments are nedeed to match the field law. Pushing geometry investigations a bit further, one can calculate the field generated by a series of conductors of limited length, arc shaped and distributed along a spiral (the one which supports the edges of the magnet). If arcs centers are located at machine ring center, it appears clearly that the maximum field of one conductor is not always located inside the limits of the iron yoke. This still have to be confirmed with a 3d simulation.

Orateur: M. Emmanuel Froidefond (LPSC/IN2P3/CNRS)

document FFAGSpiralCurrentsMarch07.pdf

Paper FFAG2007_Froidefond_paper.pdf

Technology for FFAG accelerators: PRISM RF systems (C. Ohmori - KEK)

slides FFAG07_ohmori.ppt

14 PRISM RF systems

Orateur: Dr Chihiro Ohmori (KEK)

Slides FFAG07_ohmori.ppt

12:30 Lunch

Working groups sessions

15 Magnet design for FFAG "Pumplet"

Orateur: Prof. Neil Marks (CCLRC ASTeC)

Slides Pumplet_presentation.ppt

16 Muon and e-model EMMA: EMMA Injection/Extraction

EMMA electron NS-FFAG is a prototype machine of NS-FFAG. In order to investigate beam dynamics in detail, injection and extraction energy should cover whole energy range. In addition, tune betatron tune varies from 0.1 to 0.4 along the energy range. Thus, to satisfy these requirements, different approach is required for the injection sheme compared to ordinary synchrotrons. In the talk, the present status of investigation for the injection and extraction is to be presented

Orateur: Dr takeichiro yokoi (University of Oxford)

Slides FFAG07_yokoi.pdf

17 The MINA Project

Orateur: Dr Alessandro G. Ruggiero (BNL)

Slides Sandro-0.ppt

18 Tune-stabilized Linear-field, Nonscaling FFAG Lattice Design

A hybrid design for a FFAG has been invented which uses a combination of edge and alternating-gradient focusing principles applied in a specific configuration to a combined-function magnet to stabilize tunes through an acceleration cycle which extends over a factor of 2-6 in momentum. Previous work on fixed-field alternating gradient (FFAG) accelerators have required the use of strong, high-order multipole fields to achieve this effect necessitating complex and larger-aperture magnetic components as in the radial or spiral sector FFAGs. Using normal conducting magnets, the final, extracted energy from this machine attains 400 MeV/nucleon and thus supports a carbon ion beam in the energy range of interest for cancer therapy. Competing machines for this application include a superconducting cyclotron and a synchrotron. The machine proposed here has the high current advantage of the cyclotron with the smaller radial aperture requirements that are more typical of the synchrotron; and as such represents a desirable innovation for therapy machines.

Orateur: Dr Carol Johnstone (Fermilab)

Slides FFAG07.ppt

19 Cyclotrons vs FFAG

Orateur: Dr Jaroslaw Pasternak (LPSC-CNRS)

Slides WhyFFAG_Pasternak.ppt

20:00 Banquet at "Le père gras" 20:00

sam. 14 avril

Muon and e-model EMMA: The EMMA Lattice (S. Berg - BNL)

20 The EMMA Lattice

I begin by describing the purpose and goals for the EMMA lattice. I then describe the lattice parameters for the machine and how they are related to the machine goals.

Orateur: Dr Joseph Scott Berg (Brookhaven National Laboratory)

Slides JSBerg-070414.pdf.pdf

Muon and e-model EMMA: Frequency map analysis (L. Nadolski - Soleil)

21 Frequency map analysis

Orateur: Dr laurent Nadolski (Synchrotron Soleil)

Slides FFAG07_FMA_nadolski.ppt

Muon and e-model EMMA: Positioning EMMA BPMs (D. Kelliher - RAL)

22 EMMA horizontal and vertical correctors study

Orateur: David KELLIHER (CCLRC)

Slides ffag07_davidkelliher.ppt

10:30 Coffee break

Muon and e-model EMMA: EMMA and Muon FFAG Tracking Studies (S. Machida - RAL)

23 EMMA and Muon FFAG Tracking Studies

Non-scaling FFAG has to cross many low order resonances during acceleration. Taking EMMA and Muon acceleration rings as a model, we study the effect of the resonance crossing by tracking. In particular, orbit distortion due to integer resonances and beam size growth (not emittance growth) due to half-integer resonances are investigated. We also discuss a practical way to study the subject in the EMMA ring.

Orateur: Dr Shinji Machida (CCLRC Rutherford Appleton Laboratory)

Slides machida_20070414_final.pdf

Muon and e-model EMMA: Dynamics study of scaling FFAGs (A. Sato - Osaka Univ.)

24 Muon and e-model EMMA: Dynamics study of scaling FFAGs

Orateur: Dr Sato Akira (Osaka University)

Slides 070414_hnj_sato.pdf

Muon and e-model EMMA: Scaling FFAGs using Harmonic Number Jump acceleration (Y. Mori - KURRI Inst.)

25 Muon and e-model EMMA: Scaling FFAGs using Harmonic Number Jump acceleration

Orateur: Prof. Yoshiharu Mori (Kyoto Univwrsity, Research Reactor Institute)

Slides talk-hnj.pdf

12:30 Lunch

14:00 Visit in Grenoble

dim. 15 avril

09:15 Excursion : meeting point central bus station (beside train station) at 9:15

lun. 16 avril

Proton Acceleration - ADS - RIA: FFAG-based accelerators for RI production (A.G. Ruggiero - BNL)

26 Non-Scaling FFAGs for Radio-Isotopes Production

As an alternative to the use of a Superconducting Linac, we have explored at Brookhaven National Laboratory a complex made of a pair of Non-Scaling FFAGs for the acceleration of Ions of Uranium-238 for the production of Radio-Isotopes and esotic nuclear fragments. The beam power requirement is 400 kWatt at an energy of 400 MeV/ u. The design of the FFAG accelerators is straightfoward and seems considerably less expensive than the full length of a Superconducting Linac. The major issue is the intensity, emittance and repetition rate of the ion source required. Operation ar 1 kHz, 10kHz and continuous mode are described.

Orateur: Dr Alessandro Ruggiero (Brookhaven National Laboratory)

Slides Sandro-1.ppt

Proton Acceleration - ADS - RIA: FFAG design for RI production (D. Trbojevic - BNL)

27 Non-scaling FFAG lattice design for the Radioactive Ion Accelerator

A major cost of the Radioactive Ion accelerator is in the superconducting linac the present design assumes three superconducting linacs with stripping foils between two stages of heavy ion acceleration. The heavy ion maximum kinetic energy is assumed to be 400 MeV/u with a total of 400 kW power for uranium ion beams. To reduce the cost for the long superconducting linacs multi-turn acceleration with the non-scaling FFAG is proposed. A lattice for this acceleration is presented.

Orateur: Dr Dejan Trbojevic (Brookhaven National Laboratory)

Slides GrenobleFFAGWorkshop_RIA_DejanTrbojevic.ppt

Proton Acceleration - ADS - RIA: 10-MW NS-NL FFAG SNS (G. Rees - CCLRC)

28 Proton Acceleration - ADS - RIA: 10-MW NS-NL FFAG SNS

Orateur: Dr Grahame Rees (CCLRC)

Slides 10_MW_Source.ppt

10:30 Coffee break

Proton Acceleration - ADS - RIA: The Electron model for NL NS proton driver (F. Lemuet - LPSC)

29 Tracking studies regarding the electron model 3-5.4463~MeV of a non-linear, non-scaling, proton driver FFAG 3-10~GeV.

This paper describes the setting up of ray-tracing tools and preliminary beam dynamics studies concerning the electron model 3-5.4463~MeV of a non-linear, non-scaling proton driver FFAG 3-10~GeV.

Orateur: M. franck lemuet (doctoral student)

Slides talk_FFAG07.pdf

Proton Acceleration - ADS - RIA: Hamiltonian Description of the Dynamics of Particles in Non Scaling FFAG Machines (S. Tzenov - CCLRC)

30 Hamiltonian Description of the Dynamics of Particles in Non Scaling FFAG Machines

Based on the synchro-betatron formalism the theory of accelerated orbits in FFAG accelerators is developed. Traditional notions like dispersion, momentum compaction and slip phase have been introduced with due account of the reference and accelerated orbit. Further, some preliminary features of the longitudinal dynamics have been pointed out.

Orateur: Prof. Stephan TZENOV (CCLRC Daresbury Laboratory)

Slides FFAG2007_S_Tzenov.ppt

Proton Acceleration - ADS - RIA: 10-MW 1-GeV generic proton driver (A.G. Ruggiero - BNL)

31 A 10-MWatt 1-GeV Proton Driver with FFAG accelerator

The use of a Non-Scaling FFAG accelerator is here described for the acceleration of Protons to 1 GeV or more for an average beam power of 10 MWatt or more. Several modes of operation are descibed: at the repetition rate of 1 kHz, 10 kHz, and in Continuou Mode. The use of Harmonic Number Jump method for acceleration is also assumed. Possible applications for the Proton Driver includes Spallation Neutron Source, pulsed and Continuous, driving a subcritical nuclear core for energy production, waste transmutation, tritium production, radioisotopes production, and more...

Orateur: Dr Alessandro Ruggiero (Brookhaven National Laboratory)

Slides Sandro-2.ppt

12:30 Lunch

Working groups sessions

1. Hamiltonian Description of Dynamics of Particles in NS
   FFAG, S. Tzenov / 2. Discussion and presentations on
   operation with HNJ, all / 3. Discussion of outstanding
   issues for NS Lattice FFAG, all / 4. Other topics... , all

32 Novel 200-400 Hz accelerators for proton and carbon therapy: the cyclinacs

Since many years the TERA Foundation is working on "cyclinacs", novel accelerators which produces a beam particularly suited for the many paintings spot-scanning technique of moving tumour targets. Indeed the beam from a cyclinac has repetition rates in the range 200-400 Hz, as necessary for painting many times the target, while the energy and the charge delivered to the next voxel can be chosen electronically (i.e. without moving absorbers), as needed for spot-scanning with fast transverse and longitudinal feedback corrections. After explaining the working principle of a cyclinac and the prototype work done on a 3 GHz linac for protons and carbon ions, two projects will be described: IDRA and CABOTO. They are based on (i) a 30 MeV proton cyclotron, used also to produce radioisotopes for diagnostics and endoradiotherapy, and (ii) a 300 MeV/u carbon ion cyclotron, which is used for the protontherapy of deep seated tumours.

Orateur: Dr Ugo Amaldi (University of Milano Bicocca and TERA Foundation)

Slides FFAG-Cyclinacs-compact-16.4.07.pdf

33 Status and future of FFAGs at KURRI

Orateurs: Dr Tomonori Uesugi (Kyoto Univ. Research Reactor Institute), Prof. Yoshiharu MORI (Kyoto University, Research Reactor Institute)

Slides 1GeV-FFAG.pdf FFAG07_TomUESUGI.pdf

34 Tracking studies of phase rotation using a scalling FFAG

Orateur: Dr Ajit Kurup (Imperial College)

Slides ffag07-0407-kurup.ppt

35 Comparison of hadrontherapy installation methods

Orateur: Dr François Meot (LPSC-CNRS)

document machineComparison_carbon.xls machineComparison_proton.xls

Paper machineComparison_carbon.xls machineComparison_proton.xls

36 Techniques from the cyclotron world to compute FFAG magnets ?

Orateur: M. William BEECKMAN (Ion Beam Applications s.a. (IBA))

Slides FFAG2007WB.PPT

mar. 17 avril

Medical applications: Medical specs for FFAG beams (J. Balosso - Grenoble Hospital)

37 Medical specs for FFAG beams

Orateur: Dr Jacques Balossso (Grenoble Hospital)

Slides Medical_requirements_for_FFAG_as_proton_beam_sources.ppt

Medical applications: Cyclotron injection into medical FFAG (M. Conjat, J. Mandrillon - CAL/AIMA)

38 Cyclotron injection into medical FFAG

Orateurs: Dr Jérôme Mandrillon (CAL-Médicyc-AIMA), Dr Mathieu Conjat (CAL-Médicyc-AIMA)

Slides AIMA-i.ppt

Medical applications: RACCAM ring design (J. Pasternak/J. Fourrier - LPSC)

39 Ray-tracing simulations in spiral sector FFAG magnets using Zgoubi code.

The computer code Zgoubi calculates charged particle trajectories in electric and magnetic fields. It allows the study of complex sequences of optical elements such as dipoles, quadrupoles, arbitrary multipoles, RF cavities and radial sector FFAG magnets. A new optical element - spiral sector FFAG magnet – has been recently installed in order to perform ray-tracing simulations in such a structure. This paper describes how this method for modeling of the magnetic field in spiral scaling FFAG magnets has been developped. We then describe first simulation results for spiral FFAG lattices in the frame of the French RACCAM project which has to study and build a FFAG magnet for protontherapy.

Orateur: M. Joris Fourrier (LPSC / IN2P3 / CNRS)

Slides Joris_Fourrier_FFAG2007.pdf

40 Spiral FFAG acelerator for cancer therapy

The Fixed Field Alternating Gradient (FFAG) accelerator with 100 Hz repetition rate is very interesting for medical applications. The Spiral FFAG ring accelerator for protontherapy is studied in the framework of the RACCAM project. Possible scenarios for the variable energy operation are discussed. The injection/extraction schemes are shown and the linear optics design is presented. A possible upgrade to a carbon facility is briefly described.

Orateur: Dr Jaroslaw Pasternak (LPSC Grenoble)

Slides Pasternak_RACCAM1.ppt

10:30 Coffee break

Medical applications: ERIT (K. Okabe, M. Tanigaki, Y. Mori - KURRI Inst.)

41 ERIT

Orateurs: Dr Kota Okabe (Research Reactor Institute, Kyoto University), Dr Minoru Tanigaki (Research Reactor Institute, Kyoto University), Prof. Yoshiharu MORI (Kyoto University, Research Reactor Institute)

Slides

• 070417_FFAG07_okabe.ppt
• erit-mori.pdf
• FFAG2007-tanigaki.pdf

Medical applications: Hadron Cancer Therapy Complex Using Non-Scaling FFAG Design (E. Keil - CERN)

42 Hadron Cancer Therapy Complex Using Non-Scaling FFAG Design

Non-scaling FFAG rings for cancer hadron therapy offer reduced physical aperture and large dynamic aperture as compared with scaling FFAGs. We consider a system of three non-scaling FFAG rings for cancer therapy with 250 MeV protons and 400 MeV/u carbon ions. Hadrons are accelerated in a common RFQ and linear accelerator, and injected into the FFAG rings at v/c=0.1294. H+ and C6+ ions are accelerated in the two smaller/larger rings to 31 and 250 MeV/68.8 and 400 MeV/u kinetic energy, respectively. The lattices consist of doublet cells with a straight section for rf cavities. The frequency modulated rf system operates at frequencies between about 8 and 25 MHz.

Orateur: Dr Eberhard Keil (CERN)

Slides FFAG_2007_Keil.pdf

Medical applications: Superconducting FFAG gantry for carbon/proton therapy (D. Trbojevic - BNL)

43 Update on the non-scaling FFAG superconducting gantry for carbon/proton therapy application

The major problem in a design and building of the carbon/proton therapy facilities are the isocentric gantries. The weight of the transport elements of the isocentric gantry in the most recent design in Darmstadt, Germany is 130 tons, while the whole gantry with support structure; (rotating part with transport elements and counter weights) is 630 tons. This represents the most difficult challenge of the whole facility. We present a non-scaling FFAG superconducting magnet design with an estimated weight of 1.5 tons. Advantages of such a system are a smaller weight and ease in operation due to the fixed fields for all required ion energies for treatment.

Orateur: Dejan Trbojevic (Brookhaven National Laboratory)

Slides D_Trbojevic_NonScalingFFAG_GantryTalk.ppt

12:30 Lunch

Summaries

44 Technology

Orateur: Dr Chihiro Ohmori (KEK)

45 Muon

Orateur: Dr Jaroslaw Pasternak (LPSC/IN2P3/CNRS)

Slides Summary_Muon.ppt

46 Proton

Orateur: Dr Grahame Rees (CCLRC)

47 Medical

Orateur: Dr Pierre Mandrillon (CAL/MEDICYC/AIMA)