Keyword: extraction
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MOXBA01 J-PARC Beam Commissioning Progress beam-losses, injection, linac, vacuum 6
 
  • H. Hotchi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
 
  The J-PARC is a multi-purpose proton accelerator facility amiming at MW-class output beam power, consisting of a 400 MeV H linac, a 3-GeV RCS, a 50-GeV MR (Main Ring) and three experimental facilities, the MLF (materials and life science experimental facility), the HD (hadron experimental hall) and the NU (neutrino beam line). The J-PARC beam commissioning started in November 2006 from the linac to the downstream facilities. The current output beam power from the RCS to the MLF users is 210 kW, and the MR delivers 145 kW beam to the NU by fast extraction and a few kW beam to the HD by slow extraction. In this talk, we present a current status of the J-PARC beam commissioning, in which a recent progress in the course of the RCS beam power ramp-up scenario will be described in more detail. This talk will focus on the issues (including beam dynamics), challenges, solutions, and lessons learned during the commissioning and user operation of J-PARC and future plans.  
slides icon Slides MOXBA01 [2.615 MB]  
 
MOPC058 Upgrade of the 200 MHz RF System in the CERN SPS cavity, emittance, impedance, acceleration 214
 
  • E.N. Shaposhnikova, E. Ciapala, E. Montesinos
    CERN, Geneva, Switzerland
 
  The 200 MHz RF system, used in the SPS to accelerate all beams including those for the LHC, has four travelling wave structure cavities of different length. To stabilize the future higher intensity LHC beams in the SPS a larger (than now) controlled longitudinal emittance blow-up and therefore larger bucket and voltage amplitude will be necessary. However less voltage will be available in the existing system (which has a maximum peak RF power of 1 MW per cavity) due to the increased beam loading, in particular in the long cavities. This issue will be critical for beam acceleration but especially for beam transfer into the 400 MHz RF system of the LHC. The proposed solution is to shorten the two long cavities and use the freed sections together with spare sections to make two extra cavities and install two new power plants of 1.3 MW each. After this upgrade, which is a major part of the more general SPS upgrade for high luminosity LHC to be completed during 2017, the performance of the SPS RF system with high intensity beams will be significantly improved and at the same time the total impedance of the system will be reduced.  
 
MOPO039 B-train Performances at CNAO dipole, feedback, synchrotron, power-supply 568
 
  • M. Pezzetta, G. Bazzano, E. Bressi, L. Falbo, C. Priano, M. Pullia
    CNAO Foundation, Milan, Italy
  • O. Coiro, G. Franzini, D. Pellegrini, M. Serio, A. Stella
    INFN/LNF, Frascati (Roma), Italy
  • G. Venchi
    University of Pavia, Pavia, Italy
 
  The commissioning of CNAO, the Italian Centre of Oncological Hadrontherapy, with proton beams is completed. The real-time measurement of the synchrotron dipole field with the so-called B-train, together with its electronic systems and related software and firmware are here described. An additional magnet, powered in series with the synchrotron dipoles, is equipped with a special coil that measures the field integral variation along the beam nominal path. The voltage induced in the coil is digitized with a fast ADC and numerically integrated by an FPGA. The field integral is then distributed to the users every time that the equivalent field changes by 0.1 G. The measured B field ranges from 0 to 1.6 T with maximum ramps of 3 T/s. The B-train system will be used to provide feedback in field to the dipole power supply. It will handle the limited bandwidth of the active filter, the B-field lag in the magnets and will avoid current jumps.  
 
MOPO042 Photonic Crystal Fibre Laser for Electron Beam Emittance Measurement* laser, emittance, electron, diagnostics 577
 
  • L. Corner, L.J. Nevay, R. Walczak
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
 
  We discuss the recent progress in the development of a high repetition rate, high energy fibre laser for intratrain laser-wire scans of transverse electron beam sizes. A commercial fibre laser (1uJ, 6.49MHz) is amplified in rod type photonic crystal fibre using a burst mode format, which has the advantage of allowing us to exploit very high transient gain while reducing the heat load deposited in the amplifier. The amplified pulses are over 180uJ spaced at 154ns, suitable for intratrain scanning at the ATF2. The spatial beam quality is excellent (M2 = 1.07), indicating that it will be possible to focus the laser to a spot size of ~ λ, enabling us to reach high intensities. The amplified pulse duration is 200ps, which can be compressed to less than the electron bunch length to increase the laser-wire signal to noise ratio. The performance of the laser system is analysed with respect to the demands of the laser-wire experiment.  
 
MOPS008 Simulation of Longitudinal Emittance Control in J-PARC RCS for 400 MeV Injection emittance, injection, simulation, bunching 607
 
  • M. Yamamoto, M. Nomura, A. Schnase, T. Shimada, F. Tamura
    JAEA/J-PARC, Tokai-mura, Japan
  • E. Ezura, K. Hara, K. Hasegawa, C. Ohmori, A. Takagi, K. Takata, M. Toda, M. Yoshii
    KEK, Ibaraki, Japan
 
  The injection energy upgrade of the J-PARC RCS from 181 MeV to 400 MeV is scheduled, this is necessary to achieve the design beam intensity. The high intensity beam is delivered to the MR, and the space charge effect at the MR injection should be alleviated by optimizing the longitudinal beam emittance at RCS extraction. This is realized by matching the shape of the beam emittance between the RCS and the MR. We describe the results of particle tracking simulation with the longitudinal emittance control during the whole acceleration period of the RCS.  
 
MOPS009 Probing Intensity Limits of LHC-type Bunches in the CERN SPS with Nominal Optics emittance, injection, single-bunch, optics 610
 
  • B. Salvant, G. Adrian, D.J. Allen, O. Andujar, T. Argyropoulos, J. Axensalva, J. Baldy, H. Bartosik, S. Cettour Cave, F. Chapuis, J.F. Comblin, K. Cornelis, D.G. Cotte, K. Cunnington, H. Damerau, M. Delrieux, J.L. Duran-Lopez, A. Findlay, J. Fleuret, F. Follin, P. Freyermuth, H. Genoud, S.S. Gilardoni, A. Guerrero, S. Hancock, K. Hanke, O. Hans, R. Hazelaar, W. Höfle, L.K. Jensen, J. Kuczerowski, Y. Le Borgne, R. Maillet, D. Manglunki, S. Massot, E. Matli, G. Metral, B. Mikulec, E. Métral, J.-M. Nonglaton, E. Ovalle, L. Pereira, F.C. Peters, A. Rey, J.P. Ridewood, G. Rumolo, J.L. Sanchez Alvarez, E.N. Shaposhnikova, R.R. Steerenberg, R.J. Steinhagen, J. Tan, B. Vandorpe, E. Veyrunes
    CERN, Geneva, Switzerland
 
  Some of the upgrade scenarios of the high-luminosity LHC require large intensity per bunch from the injector chain. Single bunch beams with intensities of up to 3.5 to 4·1011 p/b and nominal emittances were successfully produced in the PS Complex and delivered to the SPS in 2010. This contribution presents results of studies with this new intense beam in the SPS to probe single bunch intensity limitations with nominal gamma transition. In particular, the vertical Transverse Mode Coupling Instability (TMCI) threshold with low chromaticity was observed at 1.6·1011 p/b for single nominal LHC bunches in the SPS. With increased vertical chromaticity, larger intensities could be injected, stored along the flat bottom and accelerated up to 450 GeV/c. However, significant losses and/or transverse emittance blow up were then observed. Longitudinal and transverse optimization efforts in the PSB, PS and SPS were put in place to minimize this beam degradation and succeeded to obtain single 2.3·1011 p/b LHC type bunches with satisfying parameters at extraction of the SPS.  
 
MOPS013 Transverse Low Frequency Broad-band Impedance Measurements in the CERN PS impedance, proton, space-charge, injection 622
 
  • S. Aumon
    EPFL, Lausanne, Switzerland
  • P. Freyermuth, S.S. Gilardoni, O. Hans, E. Métral, G. Rumolo
    CERN, Geneva, Switzerland
 
  The base-line scenario for the High-Luminosity LHC upgrade foresees an intensity increase delivered by the injectors. With its 53 years, the CERN PS would have to operate beyond the limit of its performances to match the future requirements. Beam instabilities driven by transverse impedance are an important issue for the operation of high intensity beams as for the high-brightness LHC beams. Measurements of transverse tune dependence with beam intensity were performed at injection kinetic energy 1.4~GeV and at LHC beam extraction momentum 26~GeV/c. This allows deducing the low frequency inductive broad-band impedance of the machine. Then an estimation of the real part of the impedance is made by the rise time measurement of a fast transverse instability believed to be a TMCI type. Those are the first step towards a global machine impedance characterization in order to push forward the performances of the accelerator.  
 
MOPS016 First Observations of Intensity-dependent Effects for Transversally Split Beams resonance, space-charge, booster, coupling 631
 
  • S.S. Gilardoni, M. Giovannozzi
    CERN, Geneva, Switzerland
 
  During the commissioning of the CERN PS Multi-Turn Extraction (MTE) tests with different beam intensities were performed. The beam current before transverse splitting was varied and the properties of the five beamlets obtained by crossing the fourth-order horizontal resonance were studied. A clear dependence of the beamlets’ parameters on the total intensity was found, which is a first observation of intensity-dependent effects for such a peculiar beam type. The experimental results are presented and discussed in this paper.  
 
MOPS021 Beam Dynamics of a Compact SC Isochronous Cyclotron - Preliminary Study of Central Region* proton, cyclotron, acceleration, ion 643
 
  • J.X. Zhang, T.A. Antaya, R.E. Block
    MIT/PSFC, Cambridge, Massachusetts, USA
 
  Funding: Pennsylvania State University ARL S11-07 and N00024-02-D-6604 US Defense Threat Reduction Agency
A compact high field superconducting isochronous cyclotron, Megatron (K250), is designed as a proof-of-principle for a single stage high power proton accelerator. This cyclotron is to accelerate proton to a final energy of 250 MeV with two 45° Dees with a radius ~40 cm. By employing a 20 mA external ECR proton source, the injected proton beam currents at high brightness are foreseen. Using phase selection in the center, a fully magnetized elliptical pole, low energy gain per turn, a precise relation between momentum and radius at large radius are expected. Two goals, a) to use this relationship to develop multi-turn extraction with passive elements only, to achieve a high external proton beam intensity (~1 mA); and b) to see if it is possible to achieve a high extraction efficiency (> 99%) without single turn extraction, with an energy spread |DE/E| ~0.1%. The RF acceleration is on the first harmonic with ωrf=ω0~64 MHz. Superconductor coils will provide a central field of B0 = 4.3 T and a peak hill field of 6.6 T. The general beam dynamics studies will be performed. Precise central field design including space charge effect will be shown in the presentation.
 
 
MOPS054 Impedance of the Pulse Power Converter for the SIS100 Bipolar Extraction Kicker System impedance, kicker, coupling, simulation 727
 
  • K. Samuelsson, V. Hinrichsen
    TU Darmstadt, Darmstadt, Germany
  • U. Blell, P.J. Spiller
    GSI, Darmstadt, Germany
 
  SIS100 will be operated with high intensity heavy-ion and proton beams. The reduction of ring impedances is therefore of great importance in order to avoid coherent beam instabilities. The kicker system is one of the main contributors to the overall ring impedance in SIS100. This paper will focus on the contribution of the external network to the kicker impedance. Calculations as well as experimental impedance measurements of the network contribution have already been carried out for the SIS18 and ESR kickers. The SIS100 will be equipped with a bipolar kicker system, which uses a Pulse Forming Network (PFN) as energy storage. For potential detachment purposes an insulation transformer will be installed. Since this setup is new in several ways it is important to know its contribution to the coupling impedance of the kicker system. In this contribution the corresponding numerical calculation is presented.  
 
MOPS059 Transverse Impedance Calculation for Simplified Model of Ferrite Kicker Magnet with Beta < 1 impedance, kicker, coupling, proton 742
 
  • N. Wang, Q. Qin
    IHEP Beijing, Beijing, People's Republic of China
 
  In high intensity rings, kicker magnet is usually considered as a main source to the total impedance. Transverse coupling impedance of a simplified kicker model has been derived analytically in the ultrarelativistic limit. We extend the result to the general case of v < c, and present the analytical formulae of both horizontal and vertical transverse impedances. Numerical results are given for the CSNS extraction kicker magnets.  
 
MOPS060 Study on Resistive Wall Instability in CSNS/RCS simulation, injection, impedance, wakefield 745
 
  • L. Huang, Y.D. Liu, S. Wang
    IHEP Beijing, Bejing, People's Republic of China
 
  Rapid Cycling Synchrotron of the China Spallation Neutron Source is a high intensity proton accelerator, with average beam power of 100kW. The collective effects caused by the coupling impedance may be the limit to beam power. The impedance estimation for components on beam line shows that the resistive wall impedance and its instability are more serious than any others. Based on the impedance budget, the instability is theoretically estimated. And a simple resistive wall wake field model is used to simulate the bunch oscillation and the growth rate instability. In this model, the continuous resistive wall wake field is equivalent to a point wake field and long bunch is sliced into many micro-bunches. By tracking the dynamics of the macro-bunches, the transverse growth rate are obtained and the result are analyzed.  
 
MOPS071 Simulations of the Impedance of the New PS Wire Scanner Tank simulation, impedance, beam-losses, vacuum 766
 
  • B. Salvant
    EPFL, Lausanne, Switzerland
  • W. Andreazza, F. Caspers, A. Grudiev, J.F. Herranz Alvarez, E. Métral, G. Rumolo
    CERN, Geneva, Switzerland
 
  The CERN PS is equipped with 4 wire scanners. It was identified that the small aperture of the current wire scanner tank causes beam losses and a new tank design was needed. The interaction of the PS bunches with the beam coupling impedance of this new tank may lead to beam degradation and wire damage. This contribution presents impedance studies of the current PS tank as well as the new design in order to assess the need to modify the design and/or install lossy materials plates dedicated to damp higher order cavity modes and reduce the total power deposited by the beam in the tank.  
 
MOPS078 Coaxial Wire Measurements of Ferrite Kicker Magnets impedance, kicker, simulation, injection 784
 
  • H.A. Day, R.M. Jones
    UMAN, Manchester, United Kingdom
  • M.J. Barnes, F. Caspers, H.A. Day, E. Métral, B. Salvant, C. Zannini
    CERN, Geneva, Switzerland
 
  Fast kicker magnets are used to inject beam into and eject beam out of the CERN accelerator rings. These kickers are generally transmission line type magnets with a rectangular shaped aperture through which the beam passes. Unless special precautions are taken the impedance of the yoke can provoke significant beam induced heating, especially for high intensities. In addition the impedance may contribute to beam instabilities. The results of longitudinal and transverse impedance measurements, for various kicker magnets, are presented and compared with analytical calculations: in addition predictions from a numerical analysis are discussed.  
 
MOPZ004 Studies for the PRISM FFAG Ring for the Next Generation Muon to Electron Conversion Experiment injection, kicker, electron, septum 826
 
  • J. Pasternak
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • M. Aslaninejad, L.J. Jenner, A. Kurup, J. Pasternak, Y. Shi, Y. Uchida
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • R.J. Barlow
    UMAN, Manchester, United Kingdom
  • K.M. Hock, B.D. Muratori
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • D.J. Kelliher, S. Machida, C.R. Prior
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • Y. Kuno, A. Sato
    Osaka University, Osaka, Japan
  • J.-B. Lagrange, Y. Mori
    KURRI, Osaka, Japan
  • M. Lancaster
    UCL, London, United Kingdom
  • C. Ohmori
    KEK, Tokai, Ibaraki, Japan
  • T. Planche
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • S.L. Smith
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • H. Witte, T. Yokoi
    JAI, Oxford, United Kingdom
 
  High intensity and high quality muon beams are needed for the next generation lepton flavour violation experiments. Such beams can be produced by sending a short proton pulse to a pion production target, capturing the pions and performing RF phase rotation on the resulting muon beam in an FFAG ring. Such a solution was proposed for the PRISM project and this paper summarizes its current status. In particular the PRISM task force was created to address the accelerator and detector issues that need to be solved in order to realise the PRISM experiment. Alternative designs for the PRISM FFAG ring are discussed and their performance compared. The injection/extraction systems and matching to the solenoid channels upstream and downstream of the FFAG ring are presented. The future direction for the study will be outlined.  
 
MOPZ007 A Non-scaling Fixed Field Alternating Gradient Accelerator for the Final Acceleration Stage of the International Design Study of the Neutrino Factory kicker, injection, cavity, lattice 832
 
  • J.S. Berg
    BNL, Upton, Long Island, New York, USA
  • M. Aslaninejad, J. Pasternak
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • N. Bliss, M.A. Cordwell, T.J. Jones
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • D.J. Kelliher, S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • A.A. Muir
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • H. Witte
    JAI, Oxford, United Kingdom
 
  Funding: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The International Design Study of the Neutrino Factory (IDS-NF) has recently completed its Interim Design Report (IDR), which presents our current baseline design of the neutrino factory. To increase the efficiency and reduce the cost of acceleration, the IDR design uses a linear non-scaling fixed field alternating gradient accelerator (FFAG) for its final acceleration stage. We present the current lattice design of that FFAG, including the main ring plus its injection and extraction systems. We describe parameters for the main ring magnets, kickers, and septa, as well as the power supplies for the kickers. We present a first pass at an engineering layout for the ring and its subsystems.
 
 
MOPZ013 MAUS: MICE Analysis User Software emittance, simulation, controls, factory 850
 
  • C.D. Tunnell
    JAI, Oxford, United Kingdom
  • C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
 
  The Muon Ionization Cooling Experiment (MICE) is unique because it measures accelerator physics quantities using particle physics methods. It follows that the software that forms the theoretical model of MICE needs to be able to not only propagate beam envelopes and optical parameters but also model detector responses and matter effects for cooling. MICE addresses this dichotomy with the software framework MAUS in order to maximize its physics sensitivity whilst providing the conveniences of, for example, a common data structure. The diversity of challenges that MICE provides from the analysis perspective means that appropriately defining the software scope and layout is critical to the correctness and maintainability of the final accelerator physics analyses. MICE has structured its code into a Map-Reduce framework to enable better parallelization whilst also introducing unit, functional, and integration tests to ensure code reliability and correctness. These methods can apply to other experiments.  
 
MOPZ030 Status of Studies of Achromat-based 6D Ionization Cooling Rings for Muons injection, lattice, solenoid, kicker 865
 
  • X.P. Ding, D.B. Cline
    UCLA, Los Angeles, California, USA
  • J.S. Berg, H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • A.A. Garren
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  Funding: This work was supported by the U.S. Department of Energy in part under award numbers DE-FG02-92ER40695 (UCLA), DE-AC02-98CH10886 (BNL) and DE-FG02-07ER84855 (Particle Beam Lasers, Inc.)”
Six dimensional ionization cooling of muons is needed to achieve the necessary luminosity for a muon collider. If that cooling could occur over multiple turns in a closed ring, there would be significant cost savings over a single-pass cooling channel. We report on the status of a cooling ring with achromatic arcs. The achromatic design permits the design to easily switch between a closed ring and a snaking geometry on injection or extraction from the ring. The ring is designed with sufficient space in each superperiod for injection and extraction magnets. We describe the ring's lattice design, performance, and injection/extraction requirements.
 
 
MOPZ038 EMMA Injection and Extraction injection, dipole, septum, kicker 883
 
  • B.D. Muratori, J.K. Jones
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • Y. Giboudot
    Brunel University, Middlesex, United Kingdom
  • D.J. Holder
    The University of Liverpool, Liverpool, United Kingdom
 
  EMMA (Electron Machine with Many Applications) is a prototype non-scaling electron FFAG hosted at Daresbury Laboratory. NS-FFAGs related to EMMA have an unprecedented potential for medical accelerators for carbon and proton hadron therapy. They could also be used as the accelerator for a sub-critical reactor. We summarize the design and commissioning of both the injection and extraction lines for this machine. In particular, we look at the commissioning challenges of injection and extraction.  
 
MOPZ039 Dispersion-free Regions and Insertions for EMMA lattice, sextupole, quadrupole, injection 886
 
  • B.D. Muratori, J.K. Jones
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  EMMA (Electron Machine with Many Applications) is a prototype non-scaling electron FFAG hosted at Daresbury Laboratory. Several upgrade possibilities for EMMA are explored, from creating a dispersion-free region in the ring to facilitate injection and extraction to making an insertion in EMMA by turning it into a racetrack-style machine. A dispersion-free region may be created in two separate ways. The first is by using a layout of EMMA which is naturally dispersion-free at the start and end of each cell. This means that we can arrange for periodic dispersion-free sections in every cell or in-between cells. The second is achieved through the use of sextupoles, by going off-axis in them, one has essentially a quadrupolar force which can be used to match the dispersion to zero in a particular place and for a particular energy. The benefits and drawbacks of both methods are discussed from the point of view of practicality and space in general, and applicability to EMMA in particular.  
 
TUPC010 Status of the Manufacturing of Accelerating Structures for LINACs linac, vacuum, controls, laser 1009
 
  • F.M. Mirapeix, J. Añel, J. Castillo, A. Ortiz
    HTS, Mendaro, Spain
  • X. Aldalur, J. Amores, A. Urzainki
    DMP, Mendaro, Spain
 
  Funding: HTS, DMP, ZEHATZ, CERN
Particle accelerators need ongoing development in the state of the art of the field: high-quality manufacturing of accelerating structures, PETS, but also drift tubes, bunchers, high-power couplers, alignment systems, precision test stands, etc. They also require engineering projects in the range of mechatronics, thermodynamics, microwaves, ultra high vacuum, cryogenics, joining techniques, high precision manufacturing, 3D high precision scanning, etc. HTS together with DMP are actually working on all this fronts. In this paper, the actual status of the manufacturing capabilities concerning some accelerating structures will be described.
 
 
TUPC011 Striplines for CLIC Pre-Damping and Damping Rings* impedance, kicker, vacuum, damping 1012
 
  • C. Belver-Aguilar, A. Faus-Golfe
    IFIC, Valencia, Spain
  • M.J. Barnes, G. Rumolo
    CERN, Geneva, Switzerland
  • F. Toral
    CIEMAT, Madrid, Spain
  • C. Zannini
    EPFL, Lausanne, Switzerland
 
  The Compact Linear Collider (CLIC) study explores the scheme for an electron-positron collider with high luminosity and a nominal center-of-mass energy of 3 TeV: CLIC would complement LHC physics in the multi-TeV range. The CLIC design relies on the presence of Pre-Damping Rings (PDR) and Damping Rings (DR) to achieve, through synchrotron radiation, the very low emittance needed to fulfil the luminosity requirements. The specifications for the kicker systems are very challenging and include very low beam coupling impedance and excellent field homogeneity: striplines have been chosen for the kicker elements. Analytical calculations have been carried out to determine the effect of tapering upon the high frequency beam coupling impedance. In addition detailed numerical modeling of the field homogeneity has been performed and the sensitivity of the homogeneity to various parameters, including stripline cross-section, has been studied. This paper presents the main conclusions of the beam impedance calculations and field homogeneity predictions.  
 
TUPC019 Beam-based Alignment of CLIC Drive Beam Decelerator using Girders Movers quadrupole, alignment, simulation, dipole 1036
 
  • G. Sterbini, D. Schulte
    CERN, Geneva, Switzerland
 
  The CLIC drive beams will provide the rf power to accelerate the colliding beams: in order to reach the design performance, an efficient transport of the drive beam has to be ensured in spite of its challenging energy spread and large current intensity. As shown in previous studies, the specifications can be met by coupling a convenient optics design with the state-of-the-art of pre-alignment and beam-based alignment techniques. In this paper we consider a novel beam-based alignment scheme that does not require quadrupole movers or dipole correctors but uses the motors already foreseen for the pre-alignment system. This implies potential savings in terms of complexity and cost at the expense of the alignment flexibility: the performance, limitations and sensitivity to pre-alignment tolerances of this method are discussed.  
 
TUPC067 Simulations of Effects of Detector Materials and Geometry to the Beam Properties of Super-FRS simulation, diagnostics, ion, antiproton 1153
 
  • M. Kalliokoski
    HIP, University of Helsinki, Finland
 
  The Super-FRS is a superconducting fragment separator that will be built as part of the FAIR facility. For the slow-extraction part of the beam diagnostics system a total of 32 detectors are needed for the beam monitoring, tracking and characterization of the produced ions. GEM-TPC detectors are planned to be used for the diagnostics at slow extraction mode of the separator*,**. The detectors will be placed in focal planes along the separator. Simulations have been made to study the effects of the detector materials and geometries in order minimize their influence to the performance of the separator. Results of the optimization using different simulation tools will be presented.
* F. Garcia et al., 2009 IEEE NSS Conference Record, Orlando, USA, N13-7 (2009).
** M. Kalliokoski et al., Proc. of IPAC'10, Kyoto, Japan, p.888 (2010).
 
 
TUPC073 Emittance Variation Dependence on Resonance Extraction Parameters at ELSA emittance, resonance, sextupole, septum 1168
 
  • S. Zander, O. Boldt, F. Frommberger, W. Hillert, O. Preisner
    ELSA, Bonn, Germany
 
  Funding: Funded by the DFG within the SFB / TR 16.
The Electron Stretcher Facility ELSA consists of several accelerator stages, the last one being a stretcher ring providing a beam of polarized electrons with an energy of up to 3.5~GeV. In order to guarantee a high duty cycle, a slow extraction via a third integer resonance is applied to the stretcher ring. The emittance of the extracted beam as well as the efficiency of the extraction process depend on different parameters as the sextupole strength being necessary for the excitation of the third integer resonance or the adjusted tune. In order to optimize the quality of the extracted beam, an accurate comprehension of the influence of these parameters is indispensable. Beam profiles are detected using dedicated synchrotron light monitors optimized for low intensities. The emittance was investigated by the method of quadrupole scan. The experimental studies are accompanied by numerical simulation studies. The results of the change of the emittance depending on different resonance extraction setups obtained by the experimental as well as by the theoretical studies will be presented.
 
 
TUPC078 The Impact of the Duty Cycle on Gamma-particle Coincidence Measurements target, background, ion, heavy-ion 1183
 
  • P.R. John, J. Leske, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
 
  Funding: Supported by BMBF under 06DA9041I
Radioactive ion beam facilities deliver a great variety of different nuclei and thus open new possibilities for gamma-ray spectroscopy with radioactive isotopes. One of the challenges for the experimentalist is the high gamma background. To obtain nearly background-free spectra a gamma-particle coincidence measurement in inverse kinematics is well suited. Also for stable beams this method offers a lot of advantages. A crucial point for experimentalists for such kind of experiments is the duty cycle and the beam structure of the accelerator. For a typical set-up, the effect of the duty cycle and beam structure, e.g. resulting from different ion-sources, on data acquisition and thus the experiment will be shown from the experimentalist's point of view. The results will be discussed for selected accelerators, i.e. UNILAC (GSI, Germany), REX-ISOLDE (CERN, Switzerland) and ATLAS (ANL, USA).
 
 
TUPC096 Solid-state Marx Generator Driven Einzel Lens Chopper ion, ECRIS, high-voltage, acceleration 1233
 
  • K. Takayama, T. Arai
    KEK, Ibaraki, Japan
  • T. Adachi, K.W. Leo
    Sokendai, Ibaraki, Japan
  • A. Tokuchi
    Pulsed Power Japan Laboratory Ltd., Kusatsu-shi Shiga, Japan
 
  A new type of pulse chopper called an Einzel lens chopper* is described. The Einzel lens, placed immediately after an electron cyclotron resonance ion source, is driven by high-voltage pulses generated by a newly developed solid-state Marx generator. A rectangular negative barrier pulse-voltage is controlled in time. The barrier pulse is switched on only when a beam pulse is required. When the barrier pulse is off, the DC voltage across the Einzel lens reflects ions back upstream with almost zero velocity. The device has been actually used as a chopper for the KEK Digital Accelerator, which is a small-scale induction synchrotron employing no a large injector and capable of providing a wide variety of ions, has been constructed at KEK**. A He ion beam of 50 micro-ampere was chopped in 5 micro-sec with rise/fall time of 40 nsec.
* T.Adachi et al., “A Solid-State Marx Generator Driven Einzel Lens Chopper”, submitted to Appl. Phys. Lett.
** T. Iwashita et al., “KEK Digital Accelerator”, Phys. Rev. ST-AB, published in 2011.
 
 
TUPC119 A Comprehensive Study of Nanometer Resolution of the IPBPM at ATF2* cavity, dipole, simulation, coupling 1296
 
  • Y.I. Kim, H. Park
    Kyungpook National University, Daegu, Republic of Korea
  • S.T. Boogert
    Royal Holloway, University of London, Surrey, United Kingdom
  • J.C. Frisch, D.J. McCormick, J. Nelson, T.J. Smith, G.R. White, M. Woodley
    SLAC, Menlo Park, California, USA
  • Y. Honda, R. Sugahara, T. Tauchi, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
 
  Funding: Work supported in part by Department of Energy Contract DE-AC02-76SF00515.
High-resolution beam position monitors (IPBPMs) have been developed in order to measure the electron beam position at the focus point of ATF2 to a few nanometers in the vertical plane. To date, the IPBPM system has operated in test mode with a highest demonstrated resolution of 8.7 nm in the ATF extraction line during 2008. After expected noise source calculations there still remains 7.9 nm of noise of unexplained origin. We summarize the experimental work on the IPBPM system since this measurement and outline the possible origins of these sources. We then present a study plan to be performed at the ATF2 facility designed to identify and to improve the resolution performance and comment on the expected ultimate resolution of this system.
 
 
TUPC128 Transverse Beam Jitter Propagation in Multi-bunch Operation at ATF2 simulation, feedback, kicker, lattice 1320
 
  • J. Resta-López, J. Alabau-Gonzalvo
    IFIC, Valencia, Spain
  • P. Burrows, G.B. Christian
    JAI, Oxford, United Kingdom
  • B. Constance
    CERN, Geneva, Switzerland
 
  Pulse-to-pulse orbit jitter, if not controlled, can drastically degrade the luminosity in future linear colliders. The second goal of the ATF2 project at the KEK accelerator test facility is to stabilize the vertical beam position down to approximately 5% of the nominal rms vertical beam size at the virtual interaction point (IP). This will require control of the orbit to better than 1 micrometer at the entrance of the ATF2 final focus system. In this paper, by means of computer simulations, we study the vertical jitter propagation along the ATF2 from the start of the extraction line to the IP. For this study pulse-to-pulse vertical jitter measurements using three stripline beam position monitors are used as initial inputs. This study is performed for the case of a bunch-train with three bunches, but could easily be extended for a larger number of bunches. The cases with and without intra-train orbit feedback correction in the extraction line of ATF2 are compared.  
 
TUPC154 Commissioning of the Detection System for a Supersonic Gas-jets Based Transverse Beam Profile Monitor ion, simulation, storage-ring, electron 1392
 
  • M. Putignano, D. Borrows, A. Intermite
    The University of Liverpool, Liverpool, United Kingdom
  • M. Putignano, M.R.F. Siggel-King, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: Work supported by STFC, the EU under GA-ITN-215080, the Helmholtz Association and GSI under VH-NG-328.
We present the commissioning results of the Micro-Channel-Plate (MCP) based, ion extraction and detection system currently in use for an experimental test stand aimed at demonstrating the operation of a least-interceptive transverse beam profile monitor based on a planar supersonic gas-jet. This monitoring design features least-interceptive operation under excellent vacuum conditions and provides fast acquisition of a fully bi-dimensional transverse profile. It bears application for ultra-low energy particle beams at future storage rings, but also for e.g. linacs at high currents and light source injectors. For instance, the Ultra-low energy Storage Ring (USR), part of the Facility for Antiproton and Ion Research (FAIR) in Germany will store antiprotons at energies of 20-300 keV. In this contribution, we report numerical simulations and experimental results obtained by calibration of the detection system with a low energy electron beam to demonstrate a 1 mm imaging resolution only limited by recoiling ion drift.
 
 
TUPC157 Design and Initial Results of a Turn-by-Turn Beam Position Monitoring System for Multiple Bunch Operation of the ATF Damping Ring injection, damping, single-bunch, feedback 1398
 
  • G.B. Christian, D.R. Bett, M.R. Davis, C. Perry
    JAI, Oxford, United Kingdom
  • R. Apsimon, P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • B. Constance, A. Gerbershagen
    CERN, Geneva, Switzerland
  • J. Resta-López
    IFIC, Valencia, Spain
 
  An FPGA-based monitoring system has been developed to study multi-bunch beam instabilities in the damping ring (DR) of the KEK Accelerator Test Facility (ATF), utilising a stripline beam position monitor (BPM) and existing BPM processor hardware. The system is designed to record the horizontal and/or vertical positions of up to three bunches in the DR in single-bunch multi-train mode or the head bunch of up to three trains in multi-bunch mode, with a bunch spacing of 5.6 ns. The FPGA firmware and data acquisition software were modified to record turn-by-turn data for up to six channels and 1–3 bunches in the DR. An overview of the system and initial results will be presented.  
 
TUPC161 Cavity Beam Position Monitor System for ATF2 cavity, dipole, quadrupole, EPICS 1410
 
  • S.T. Boogert, R. Ainsworth, G.E. Boorman, S. Molloy
    Royal Holloway, University of London, Surrey, United Kingdom
  • A.S. Aryshev, Y. Honda, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  • F.J. Cullinan, N.Y. Joshi, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • J.C. Frisch, D.J. McCormick, J. Nelson, T.J. Smith, G.R. White
    SLAC, Menlo Park, California, USA
  • A. Heo, E.-S. Kim, Y.I. Kim
    KNU, Deagu, Republic of Korea
 
  The Accelerator Test Facility 2 (ATF2) in KEK, Japan, is a prototype scaled demonstrator system for the final focus required for a future high energy lepton linear collider. The ATF2 beam-line is instrumented with a total of 41 high resolution C and S band resonant cavity beam position monitors (BPM) with associated mixer electronics and digitizers. In addition 4 high resolution BPMs have been recently installed at the interaction point, we briefly describe the first operational experience of these cavities in the ATF2 beam-line. The current status of the overall BPM system is also described, with a focus on operational techniques and performance.  
 
TUPC165 DITANET - Investigations into Accelerator Beam Diagnostics diagnostics, linac, electron, instrumentation 1422
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: Work supported by the EU under GA-PITN-215080.
DITANET is a Marie Curie initial training network in beam diagnostics. The network members, universities, research centres and industry partners, are developing diagnostics methods for a wide range of existing or future particle accelerators, both for electron and for ion beams. This is achieved through a cohesive approach that allows for the exploitation of synergies, whilst promoting knowledge exchange between partners. In addition to its broad research program, the network organizes schools and topical workshops for the beam instrumentation and particle accelerator communities. This contribution gives an overview of the Network's research outcomes to date and summarizes past and future training activities.
 
 
TUPC166 Accelerator R&D in the QUASAR Group antiproton, storage-ring, ion, diagnostics 1425
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: Work supported by STFC, the EU under GA-PITN-215080, the Helmholtz Associations and GSI under VH-NG-328.
Since its start in 2007, the QUASAR Group’s research activities have grown considerably: Whilst the research program towards an ultra-low energy storage ring (USR) at the future facility for low-energy antiproton and ion research (FLAIR) is still the main research focus, developments of beam diagnostics tools for accelerators and lights sources, investigations into superconducting linear accelerators and medical applications, including the potential use of antiproton beams for cancer therapy purposes, widen the Group’s activities and international collaboration considerably. An overview of the QUASAR Group’s research achievements in accelerator science and technology to date is given in this contribution.
 
 
TUPS028 Performance of Carbon Coating for Mitigation of Electron Cloud in the SPS electron, dipole, vacuum, insertion 1590
 
  • C. Yin Vallgren, P. Chiggiato, P. Costa Pinto, H. Neupert, G. Rumolo, E.N. Shaposhnikova, M. Taborelli
    CERN, Geneva, Switzerland
 
  Amorphous carbon (a-C) coatings have been tested in electron cloud monitors (ECM) in the Super Proton Synchrotron (SPS) and have shown for LHC type beams a reduction of the EC current by a factor 104 compared to stainless steel (SS). This performance has been maintained for more than 2 years under SPS operation conditions. Secondary electron yield (SEY) laboratory data confirm that after 1 year of SPS operation, the coating maintains a SEY below 1. The compatibility of coexisting SS and a-C surfaces has been studied in an ECM having coated and uncoated areas. The results show no degradation of the properties of the a-C areas. The performance of diamond like carbon (DLC) coating has also been studied. DLC shows a less effective reduction of the EC current than a-C, but conditioning is faster than for SS. Three a-C coated dipoles were inserted in the SPS. However, even with no EC detected, the dynamic pressure rise is similar to the one observed in the SS reference dipoles. Measurement in a new ECM equipped with clearing electrodes to verify the relation between pressure signals and intensity of the EC, as well as an improvement of the diagnostics in the dipoles are in progress.  
 
TUPS044 Recent Developments on the IFMIF/EVEDA Beam Dump Cooling Circuit ion, background 1632
 
  • M. Parro, F. Arranz, B. Brañas, D. Iglesias, D. Rapisarda
    CIEMAT, Madrid, Spain
 
  During the IFMIF/EVEDA activities a conical dump made of copper has been designed to stop the 125 mA, 9 MeV, D+ beam. This element will receive a total power of ~1 MW. It is cooled by a high velocity water flow that circulates through an annular channel along the outer surface of the cone. The coolant composition must be defined taking into account corrosion and erosion phenomena. Also, as important neutron and gamma fluxes are generated in the beam stop, the activation of corrosion products and the water radiolysis must be considered. During commissioning of the accelerator, pulsed beams with low duty cycle will be used and therefore the power will be significantly lower than the nominal one. With the double aim of minimizing erosion and of reproducing the full power margin to local boiling (used as safety interlock) it is planned to use flows lower than the nominal one. This work will present the different operation scenarios and the coolant composition choice performed.  
 
TUPS051 Design and Performance of the MICE Target* target, controls, acceleration, vacuum 1644
 
  • C.N. Booth, P. Hodgson, E. Overton, M. Robinson, P.J. Smith
    Sheffield University, Sheffield, United Kingdom
  • G.J. Barber, K.R. Long
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • E.G. Capocci, J.S. Tarrant
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  Funding: UK Science and Technology Facilities Council
The MICE experiment uses a beam of low energy muons to study ionisation cooling. This beam is derived parasitically from the ISIS synchrotron at the Rutherford Appleton Laboratory. A mechanical drive has been developed which rapidly inserts a small titanium target into the beam after acceleration and before extraction, with minimal disturbance to the circulating protons. One mechanism has operated in ISIS for over half a million pulses, and its performance will be summarised. Upgrades to this design have been tested in parallel with MICE operation; the improvements in performance and reliability will be presented, together with a discussion of further future enhancements.
 
 
TUPS052 An FPGA Based Controller for the MICE Target target, controls, injection, EPICS 1647
 
  • P.J. Smith, C.N. Booth, P. Hodgson, E. Overton, M. Robinson
    Sheffield University, Sheffield, United Kingdom
  • J. Leaver, K.R. Long
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
 
  Funding: UK Science and Technology Facilities Council
The MICE experiment uses a beam of low energy muons to test the feasibility of ionization cooling. This beam is derived parasitically from the ISIS accelerator at the Rutherford Appleton Laboratory. A target mechanism has been developed that rapidly inserts a small titanium target into the circulating proton beam immediately prior to extraction without unduly disturbing the primary ISIS beam. The original control electronics for the MICE target was based upon an 8-bit PIC. Although this system was fully functional it did not provide the necessary IO to permit full integration of the target electronics onto the MICE EPICS system. A three phase program was established to migrate both the target control and DAQ electronics from the original prototype onto a fully integrated FPGA system that is capable of interfacing with EPICS through a local PC. This paper discusses this upgrade program, the motivation behind it and the performance of the upgraded target controller.
 
 
TUPS057 Displacement of J-PARC Caused by Megaquake linac, alignment, hadron, survey 1662
 
  • M.J. Shirakata, Y. Fujii, T. Ishii, Y. Shirakabe
    KEK, Ibaraki, Japan
  • H. Harada, S. Harjo, T. Iwahashi, S.I. Meigo, T. Morishita, N. Tani
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
 
  Accelerators, beam lines, and experimental halls located in the J-PARC site were displaced by the 2011 off the Pacific coast of Tohoku Earthquake happened on 11th March, whose magnitude was nine, and its following many aftershocks. Site-wide network of measurement points distributed on grounds, buildings, and magnets was surveyed by using GPS survey system, precise digital levels, and laser trackers. The effect from the megaquake was reported for each J-PARC components, such as LINAC, Rapid Cycling Synchrotron (RCS), Main Ring (MR), neutrino and hadron beam lines, and experimental halls.  
 
TUPS060 Designing, Integrating, and Coordinating Installation of MedAustron survey, synchrotron, optics, alignment 1671
 
  • B. Nicquevert, C. Hauviller
    CERN, Geneva, Switzerland
  • M. Benedikt, B. Nicquevert
    EBG MedAustron, Wr. Neustadt, Austria
 
  Funding: CERN, Geneva, Switzerland EBG MedAustron, Wiener Neustadt, Austria
"Give me a layout good enough and a building to place it, and I will install your accelerator". To paraphrase Archimedes, this is the role attributed to Integration team in MedAustron project. Starting with the optics layout and a building sketch, the integration work consists of a series of activities, interlinked in a complex manner. First the design and integration of the accelerator: list items, define geometrical envelopes with interfaces, put them in position in CAD, identify conflicts, define input for items design and infrastructure. Then the various equipment is procured: verify and validate design data, follow-up manufacturing, fiducialize equipment, build supports. Lastly global installation: check equipped building, define survey framework, install and pre-align equipment on supports, move assemblies to their final location, survey actual position and adjust to theoretical position. The whole chain of operations from a layout to a real beam in MedAustron is illustrated. The help from item-driven data management is emphasized. Grouping all activities within a single team favors interactions between stakeholders and consistency of activities.
 
 
TUPS071 Performance of the Protection System for Superconducting Circuits during LHC Operation radiation, power-supply, interlocks, instrumentation 1701
 
  • R. Denz, Z. Charifoulline, K. Dahlerup-Petersen, R. Schmidt, A.P. Siemko, J. Steckert
    CERN, Geneva, Switzerland
 
  The protection system for superconducting magnets and bus-bars is an essential part of the LHC machine protection and ensures the integrity of substantial elements of the accelerator. Due to the large amount of hardwired and software interlock channels the dependability of the system is a critical parameter for the successful exploitation of the LHC. The paper will report on observed failure modes, present fault statistics and discuss the overall performance of the protection system during LHC operation in 2010 and 2011. Foreseen measures for further improvements and operational results obtained with already implemented system upgrades will be described.  
 
TUPZ019 Transverse Emittance Preservation through the LHC Cycle emittance, injection, luminosity, controls 1843
 
  • V. Kain, B. Goddard, B.J. Holzer, J.M. Jowett, M. Meddahi, T. Mertens, F. Roncarolo
    CERN, Geneva, Switzerland
 
  The preservation of the transverse emittance is crucial for luminosity performance. At the LHC design stage the total allowed emittance increase was set to 7% throughout the LHC cycle. The proton run in 2010 showed that the injectors can provide beams with smaller emittances than nominal and higher bunch intensities. The LHC parameters are well under control and the emittances are kept below nominal until physics. The LHC luminosity goals for the first year of running could therefore be achieved with fewer bunches than initially foreseen. This paper will report on the measured emittance growth at injection from the SPS and the evolution of the emittance through the entire LHC cycle. Sources and possible cures for the observed emittance growth will be discussed.  
 
TUPZ020 Fill Analysis and Experimental Background Observations in the LHC background, luminosity, vacuum, monitoring 1846
 
  • Y.I. Levinsen, H. Burkhardt, A. Macpherson, M. Pereira, S.X. Roe
    CERN, Geneva, Switzerland
 
  Funding: Presenting author funded by the University of Oslo
In this work we look at experimental background under different conditions for the early 2011 running. We will discuss the observations in the context of the residual gas pressure, beam halo, and cross-talk between experiments. We have developed a modular fill analysis tool which automatically extracts data and analyses each fill in the LHC. All generated and extracted information is stored for outside use. The tool is applied to aid us in the work presented here.
 
 
TUPZ021 The SPS Beam Quality Monitor, from Design to Operation injection, dipole, quadrupole, luminosity 1849
 
  • G. Papotti, T. Bohl, F. Follin, E.N. Shaposhnikova
    CERN, Geneva, Switzerland
 
  The SPS Beam Quality Monitor is a system that monitors longitudinal beam parameters on a cycle-by-cycle basis and prevents extraction to the LHC in case the specifications are not met. This avoids losses, unnecessary stress of machine protection components and luminosity degradation, additionally helping efficiency during the filling process. The system has been operational since the 2009 LHC run, checking the beam pattern, its correct position with respect to the LHC references, individual bunch lengths and stability. In this paper the algorithms used, the hardware implementation and the operational aspects are presented.  
 
WEOBB01 Sub-micrometer Resolution Transverse Electron Beam Size Measurement System based on Optical Transition Radiation electron, radiation, photon, background 1964
 
  • A.S. Aryshev, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  • S.T. Boogert, V. Karataev
    JAI, Egham, Surrey, United Kingdom
  • D. Howell
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
 
  Optical Transition Radiation (OTR) appears when a charged particle crosses a boundary between two media with different dielectric properties has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The resolution of the conventional monitors is defined by the Point Spread Function (PSF) dimension - the source distribution generated by a single electron and projected by an optical system onto a screen. For small electron beam dimensions, the PSF form significantly depends on various parameters of the optical system like diffraction of the OTR tails, spherical and chromatic aberrations, etc. In our experiment we managed to create a system which can practically measure the PSF distribution and using a new self-calibration method we are able to calculate transverse electron beam size. Here we represent the development, data analysis and novel calibration technique of a sub-micrometer electron beam profile monitor based on the measurements of the PSF shape, which OTR visibility is sensitive to micrometer electron beam dimensions.  
slides icon Slides WEOBB01 [2.506 MB]  
 
WEPC006 Upgrade Plans on the Superconducting Electron Accelerator S-DALINAC recirculation, linac, dipole, electron 2010
 
  • M. Kleinmann, R. Eichhorn, F. Hug, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
 
  Funding: Work supported by DFG through SFB 634
The S-DALINAC is a superconducting recirculating electron accelerator with maximum design energy of 130 MeV operating in cw at 3 GHz. Even so the gradients of the superconducting cavities are well above design, their design quality factor of 3*109 have not been reached so far, leading to higher heat transfer into the liquid helium than expected. Due to the limited cooling power of the cryo-plant being 120 W, the final energy achievable in cw operation is around 85 MeV, currently. In order to provide a cw beam with the designed final energy in the future, the installation of an additional recirculation path is projected. We will report on the beam-line and the magnet design for the new recirculation path. In addition, we will present the layout of two proposed scraper-systems which will be used to remove the halo of the electron beam allowing high precision coincidence experiments with very low background for nuclear physics in the future.
 
 
WEPC008 Optics for the Beam Switchyard at the European XFEL kicker, septum, undulator, quadrupole 2016
 
  • N. Golubeva, V. Balandin, W. Decking
    DESY, Hamburg, Germany
 
  The European XFEL is planed as a multi-user facility with the possibility to distribute electron bunches of one beam pulse to different beamlines. The initial stage foresees two electron beamlines each serving its own set of undulators. The later addition of a third beamline is also considered in the design of the distribution system. In addition, the integration of the transport line to the beam abortion dump allows a flexible selection of the bunch repetition pattern for each beamline. The beam extraction, both in undulator beamlines and in the beamline to the dump, will be realized with fast kickers and a Lambertson septum. In this paper we describe the magnet lattice of the deflection arcs with simultaneous horizontal and vertical dispersions and the beam optics of the beam switchyard.  
 
WEPC010 Investigations into Efficient Extraction and Acceleration of Beams from Ion Traps antiproton, emittance, ion, injection 2022
 
  • O. Karamyshev, G.A. Karamysheva
    MPI-K, Heidelberg, Germany
  • O. Karamyshev, A.I. Papash
    JINR, Dubna, Moscow Region, Russia
  • M.R.F. Siggel-King, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: Work supported by STFC, the Helmholtz Association and GSI under contract VH-NG.328
A number of exotic ion species, such as for example radioactive isotopes or antiprotons, are highly desirable at very low energies of some tens of keV for fundamental studies. In order to obtain cooled beams with low emittance and low momentum spread, these particles are often first captured in an ion trap, cooled and then extracted and accelerated before being used in experiments. The extraction mechanism and subsequent beam handling impacts critically on the final beam quality. In this contribnution, an optimized scheme for efficient beam extraction and acceleration from ion traps is presented. Field maps from different existing ion trap setups, such as for example the Musashi trap at CERN, are used as a basis for simulation studies into the beam dynamics. Input and final beam emittances are analyzed as a function of the extraction and acceleration field geometries and the performance of different possible scenarios is directly compared.
 
 
WEPC023 Beam Dynamics Simulations for the ESS-Bilbao H Ion Source ion, simulation, ion-source, emittance 2052
 
  • I. Bustinduy, F.J. Bermejo, D. Fernandez-Cañoto, J.L. Munoz, I. Rodríguez
    ESS Bilbao, Bilbao, Spain
  • M. Eguiraun, J. Feuchtwanger, Z. Izaola
    ESS-Bilbao, Zamudio, Spain
 
  Simulations are performed for the Ion Source Test Stand (ITUR) of the ESS-Bilbao research accelerator facility. The beam dynamics is investigated as a function of the extraction voltages, the ion current, and the inclination angle of the ion source. The ITUR Penning H− ion source has the plasma aperture plate and extraction electrode inclined a certain angle with respect to the vertical axis to compensate for the Penning magnets field. The negative charged particles are extracted through a rectangular slit of 10×6 mm2. The extraction system is mainly composed of two devices, a rectangular extraction electrode and a refrigerated trumpet shaped device acting as an Einzel lens to focus the beam, and also, as a trap for neutral cesium atoms exiting from the source. Results are calculated and analyzed at the DC Current Transformer and pepperpot positions located at 245 mm and 882 mm from the ion source.  
 
WEPC056 Beam Test of Slow Extraction from the ESR resonance, septum, sextupole, ion 2142
 
  • A. Dolinskii, C. Dimopoulou, O.E. Gorda, S.A. Litvinov, F. Nolden, M. Steck
    GSI, Darmstadt, Germany
 
  In the frame of a dedicated ESR machine development the conventional third order resonant slow extraction was theoretically investigated and experimentally tested. The possibility to extract a beam from the ESR by preparing a resonant closed orbit, which has strong nonlinear characteristics, was demonstrated. A third-integer resonance slow extraction has been adopted for the 100 MeV/u Ar beam.  
 
WEPC059 Optimization of the Sextupole Scheme and Compensation of the Time-Dependent Field Errors during Slow Extraction from the Superconducting Synchrotron SIS300 sextupole, lattice, dipole, resonance 2151
 
  • A. Saa Hernandez, P.J. Spiller
    GSI, Darmstadt, Germany
  • U. Ratzinger
    IAP, Frankfurt am Main, Germany
 
  The SIS300 synchrotron, planned for the new Facility for Antiproton and Ion Research (FAIR) at GSI-Darmstadt, will become the first superconducting synchrotron worldwide using cos(θ) magnets for resonant slow extraction. A multi-objective optimization algorithm has been developed for the design of the non-linear magnet scheme. The optimization algorithm makes use of the analytical model for the slow extraction from Kobayashi, the analytical description of the resonance excitation and amplitude-dependent tune-shift from Bengtsson, and corrects the chromaticity in order to fulfill the Hardt condition. As a result, the placement of the chromatic and harmonic sextupole magnets in SIS300, the number of sextupole families and the gradients of these families have been optimized for a high efficiency slow extraction. The algorithm accounts also for the sextupole errors on the dipole magnets, compensating its effects. Furthermore, optimized time-dependent settings for the sextupole magnets are generated to compensate the persistent current decay occurring at slow extraction. Tolerances for the magnets are set for the limits where the compensation is no longer valid.  
 
WEPC091 Studies with a Particle Tracking Code for the SIS100 Resonant Extraction System quadrupole, controls, synchrotron, feedback 2220
 
  • M.M. Kirk, G. Franchetti, H. Klingbeil, P. Moritz, N. Pyka, H. Ramakers, P.J. Spiller, H. Welker
    GSI, Darmstadt, Germany
 
  Several issues concerning the envisaged SIS100 resonant extraction at GSI can be resolved with a simulation-lead approach for which a particle tracking code was developed. Applications to date have included: design and testing of data supply algorithms for the accelerator control system; requirements analysis for the power converter ripple in the quadrupoles forming the doublet focusing; and verification of the RF Knock-Out exciter's performance.  
 
WEPC121 XML Constructs for Developing Dynamics Applications or Towards a Universal Representation of Particle Accelerators in XML controls, EPICS, lattice, diagnostics 2295
 
  • J.T.M. Chrin, R.A. Krempaska, H. Lutz, G. Prekas
    PSI, Villigen, Switzerland
  • T.A. Pelaia
    ORNL, Oak Ridge, Tennessee, USA
 
  A recognized practice within the development of high-level beam dynamics applications is to separate data parameters destined for the configuration of the application from the programming language domain. The contemporary approach is to generate input files that provide the configuration parameters in a structured data format specified by the Extensible Markup Language (XML), enhancing flexibility and simplifying code maintenance. Furthermore, a careful choice of syntactic constructs, i.e. structured elements, attributes, etc., that map well to the various accelerator components, provides a basis for portability of applications. This has been exemplified by the XAL software package which initiated an XML description of the Standard Machine Format (SMF) accelerator object model. We have since adopted XML-SMF to provide an XML representation of both the Swiss Light Source (SLS) and the SwissFEL Injector Test Facility. We demonstrate how such XML constructs allow us to deploy the same orbit display application at both facilities. Our experience leads us to advocate a Universal Machine Format (UMF) that encompasses an all-inclusive XML schema for the management of accelerator information.  
poster icon Poster WEPC121 [0.313 MB]  
 
WEPC158 The EMMA Accelerator, A Diagnostic Systems Overview injection, diagnostics, pick-up, EPICS 2355
 
  • R.J. Smith, M. Dufau, C. Hill, J.K. Jones, A. Kalinin, L. Ma, P.A. McIntosh, B.D. Muratori, B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • J.S. Berg
    BNL, Upton, Long Island, New York, USA
  • N. Bliss, G. Cox, A. Gallagher, A. Oates
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • R.G. Borrell
    WareWorks Ltd, Manchester, United Kingdom
  • J.L. Crisp
    FRIB, East Lansing, Michigan, USA
  • K.M. Hock, D.J. Holder
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.G. Ibison, I. Kirkman
    The University of Liverpool, Liverpool, United Kingdom
  • D.J. Kelliher, S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
 
  The ‘EMMA’ Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) international project is currently being commissioned at Daresbury Laboratory, UK. This accelerator has been equipped with a number of diagnostic systems to facilitate this. These systems include a novel time-domain-multiplexing BPM system, moveable screen systems, a time-of-flight instrument, Faraday cups, and injection/extraction tomography sections to analyse the single bunch beams. An upgrade still to implement includes the installation of a fast wall current monitor. This paper gives an overview of these systems and shows some data and results that have contributed to the successful demonstration of a serpentine acceleration by this novel accelerator.  
 
WEPC174 A Failure Catalogue for the LHC monitoring, vacuum, beam-losses, injection 2394
 
  • S. Wagner, R. Schmidt, B. Todd, J.A. Uythoven, M. Zerlauth
    CERN, Geneva, Switzerland
 
  The LHC, with a stored energy of more than 360 MJ per beam, requires a complex machine protection system to prevent equipment damage. The system was designed based on a large number of possible failures in the subsystems and operational phases of the LHC. This led to a mixed system with active and passive protection. The active part monitors many thousand parameters (such as beam losses, temperatures in superconducting magnets, power converter currents, etc.) and triggers a beam dump in case a failure is detected. The passive part includes protection elements like collimators and beam absorbers to ensure the prevention of damage in case of single turn beam losses (e.g. during beam transfer and injection). So far, the knowledge of the possible failures is distributed over the different teams involved in the design, construction and operation of the LHC. A newly started project aims at bringing together this knowledge in a common failure catalogue. The chosen approach in addition is expected to allow for the identification of failures that might not have been considered yet or that require further measures. This paper introduces the approach and presents the first experience.  
 
WEPO006 Suppression of Leakage Fields from DC Magnets in J-PARC 3 GeV RCS shielding, beam-losses, septum, vacuum 2412
 
  • M. Yoshimoto, H. Harada, N. Hayashi, H. Hotchi, M. Kinsho, P.K. Saha, K. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
 
  In the J-PARC 3 GeV RCS, we found that DC leakage fields from the extraction beam line significantly affected the beam. For this issue, we installed additional shields and got the 40% reduction of the DC leakage field. Thus the circulating beam loss was successfully reduced. In this presentation, we report the detail of the shield structure and the results of the beam studies.  
 
WEPO011 Design study of Electromagnet for 13MeV PET Cyclotron cyclotron, proton, simulation, focusing 2415
 
  • B.N. Lee, J.-S. Chai, H.W. Kim, J.H. Oh, H.S. Song
    SKKU, Suwon, Republic of Korea
 
  Funding: National Research Foundation of Korea
Cyclotron electromagnet for RI production which is used for PET scanning has been designed. Designed pancake-shape electromagnet is an advanced type of KIRAMS-13's electromagnet which has the H-type electromagnet. The AVF structure with hill and valley was used for getting strong axial focusing and producing the energy of proton beam up to 13MeV with a thin stripper foil. To design and analyse the magnet, 3D CAD (CATIA V5)and TOSCA (OPERA-3D)were used, respectively. To reduce the calculation time, routine files were developed which can generate model, mesh and field map automatically in TOSCA modeller and post processor. The beam dynamics program OPTICY is used for calculation of the tunes.
KIRAMS-13* is the cyclotron had been manufactured by KIRAMS.
KIRAMS is short for Korea Institutes of Radiological and Medical Science.
 
 
WEPS007 CNAO Synchrotron Commissioning synchrotron, pick-up, proton, betatron 2496
 
  • C. Priano, G. Balbinot, G. Bazzano, J. Bosser, E. Bressi, M. Caldara, H. Caracciolo, L. Falbo, A. Parravicini, M. Pullia, C. Viviani
    CNAO Foundation, Milan, Italy
  • C. Biscari, A. Ghigo
    INFN/LNF, Frascati (Roma), Italy
 
  The CNAO (National Center for Oncological Hadrontherapy), located in Pavia, is the first Italian center for deep hadrontherapy with proton and carbon ion beams. The CNAO synchrotron initial commissioning has been carried out using proton beams in the full range of energies: 60 to 250 MeV/u. The first foreseen treatments will need energies between 120 and 170 MeV/u. The nominal proton currents have been reached. The energy scaling of the synchrotron systems and parameters leads to an extracted energy that matches the measured particle range better than 0.1 mm, fitting the treatment requirements, with repeatable beam size and beam current in the treatment room at all investigated energies. A summary of the main results of the synchrotron commissioning is presented.  
 
WEPS008 Operation Status and Future Plan of J-PARC Main Ring beam-losses, kicker, linac, betatron 2499
 
  • T. Koseki
    KEK, Ibaraki, Japan
 
  The J-PARC Main Ring (MR) has started users operation since 2009. The MR has two beam extraction systems. One is a fast extraction (FX) system for beam delivery to the neutrino beam line of the Tokai-to-Kamioka (T2K) experiment, and the other is a slow extraction (SX) system for beam delivery to the hadron experimental hall. For the T2K experiment, the maximum beam power of 145 kW is delivered continuously. For users of the hadron experimental hall, the beam power of 3 kW is delivered with extraction efficiency of 99.5%. In this paper, status of the high power beam operation of the MR is presented. Future prospect for increasing beam intensity is also discussed.  
 
WEPS019 Study of a Rapid Cycling Synchrotron to Replace the CERN PS Booster injection, booster, linac, lattice 2523
 
  • K. Hanke, O. Aberle, M. E. Angoletta, B. Balhan, W. Bartmann, M. Benedikt, J. Borburgh, D. Bozzini, C. Carli, P. Dahlen, T. Dobers, M. Fitterer, R. Garoby, S.S. Gilardoni, B. Goddard, J. Hansen, T. Hermanns, M. Hourican, S. Jensen, A. Kosmicki, L.A. Lopez Hernandez, M. Meddahi, B. Mikulec, A. Newborough, M. Nonis, S. Olek, M.M. Paoluzzi, S. Pittet, B. Puccio, V. Raginel, I. Ruehl, H.O. Schönauer, L. Sermeus, R.R. Steerenberg, J. Tan, J. Tückmantel, M. Vretenar, M. Widorski
    CERN, Geneva, Switzerland
 
  CERN’s proton injector chain is undergoing a massive consolidation and upgrade program in order to deliver beams meeting the needs of the LHC Luminosity Upgrade. As an alternative to the upgrade of the existing Proton Synchrotron Booster (PSB), the construction of a Rapid Cycling Synchrotron (RCS) has been studied. This machine would replace the PSB and deliver beams to the LHC as well as to CERN’s rich fixed-target physics program. This paper summarizes the outcome of the feasibility study along with a tentative RCS design.  
 
WEPS020 Study of an Energy Upgrade of the CERN PS Booster booster, injection, power-supply, emittance 2526
 
  • K. Hanke, O. Aberle, M. E. Angoletta, W. Bartmann, S. Bartolome, C. Bertone, A. Blas, J. Borburgh, D. Bozzini, A.C. Butterworth, C. Carli, P. Dahlen, T. Dobers, A. Findlay, R. Folch, N. Gilbert, J. Hansen, T. Hermanns, S. Jensen, P. Le Roux, L.A. Lopez Hernandez, E. Mahner, A. Masi, B. Mikulec, Y. Muttoni, A. Newborough, D. Nisbet, M. Nonis, S. Olek, M.M. Paoluzzi, S. Pittet, B. Puccio, V. Raginel, I. Ruehl, J. Tan, B. Todd, W.J.M. Weterings, M. Widorski
    CERN, Geneva, Switzerland
 
  CERN’s LHC injector chain will have to deliver beams with ultimate brilliance as the LHC is heading for increased luminosity in the coming years. In order to overcome bottlenecks in the injector chain, an increase of the beam transfer energy from the CERN Proton Synchrotron Booster (PSB) to the Proton Synchrotron (PS) has been investigated as a possible upgrade scenario. This paper gives an overview of the technical solutions and summarizes the conclusions of the feasibility study.  
 
WEPS023 A Possible RF System for CERN RCS cavity, synchrotron, injection, booster 2532
 
  • M.M. Paoluzzi
    CERN, Geneva, Switzerland
 
  As part of the LHC Injectors Upgrade (LIU) program at CERN the possibility of replacing the PSB with a new Rapid Cycling Synchrotron (RCS) is considered. The requirements in terms of accelerating voltage (60 kV), frequency range (1.7 MHz – 9.5 MHz) and available space (4 m) make the RF system development quite challenging. The improved loss characteristics of the new FINEMET® type (FT3L) combined with a filter-like topology, allows achieving all the requirements. This paper describes the design of such a RF system.  
 
WEPS028 Lattice Design of a Rapid Cycling Medical Synchrotron for Carbon/Proton Therapy synchrotron, proton, ion, injection 2541
 
  • D. Trbojevic, J.G. Alessi, M. Blaskiewicz, C. Cullen, H. Hahn, D.I. Lowenstein, I. Marneris, W. Meng, J.-L. Mi, C. Pai, D. Raparia, A. Rusek, J. Sandberg, N. Tsoupas, J.E. Tuozzolo, A. Zaltsman, W. Zhang
    BNL, Upton, Long Island, New York, USA
  • N.M. Cook
    Stony Brook University, Stony Brook, USA
  • J.P. Lidestri
    HHMI, New York, USA
  • M. Okamura
    RBRC, Upton, Long Island, New York, USA
  • S. Peggs
    ESS, Lund, Sweden
 
  Funding: Work supported by Cooperative Research and Development Agreement (CRADA), No. BNL-C-10-03 between the Brookhaven National Laboratory and Best Medical International, Inc.
We present a design of the ion Rapid Cycling Medical Synchrotron (iRCMS) for carbon/proton cancer therapy facility. The facility design, produced at Brookhaven National Accelerator (BNL) at the Collider Accelerator Division (CAD) for the BEST Medical International, Inc., will be able to treat the cancer patients with carbon, lighter ions and protons. The low energy part accelerates ions and protons to the kinetic energy of 8 MeV. It consists of two ion sources (one of fully stripped carbon ions and one for protons), a Radio-Frequency Quadrupole (RFQ) and linac. The 8 GeV beam is injected into a fast cycling synchrotron (iRCMS). The lattice design is a racetrack, with zero dispersion two parallel straight sections. There are 24 combined function magnets in the two arcs with a radius of ~5.6 meters with maximum magnetic field of less than 1.3 T. The acceleration is performed in 30 Hz up to the required energy for the cancer tumor treatment assuming the spot scanning technique. The maximum energy for carbon ions is 400 MeV. Ions are extracted in a single turn and fed to different beam lines for patient treatment.
 
 
WEPS044 Status of the Ion Source and RFQ Test Bench at the Heidelberg Ion Beam Therapy Centre ion, emittance, rfq, ion-source 2586
 
  • R. Cee, E. Feldmeier, M. Galonska, Th. Haberer, J.M. Mosthaf, B. Naas, A. Peters, S. Scheloske, J. Schreiner, T. Winkelmann
    HIT, Heidelberg, Germany
 
  The possibility of cancer treatment with proton and carbon beams provides HIT (Heidelberg Ion Beam Therapy Centre) with an exceptional feature and gives it a unique position in Europe. In the future, the variety of available ions will be extended towards helium and oxygen. To allow fast switching between three of these ion species an additional ion-source / spectrometer combination will be installed in the LEBT. For comprehensive tests of the new components a dedicated test bench including a beam emittance analyzer has been set up at the HIT facility. It opens up the opportunity to perform detailed investigations of the improved ECR ion source with its enhanced extraction system and the redesigned RFQ of the HIT injector. Parallel to the measurements, the beam optical model of the assembly could be refined to better reproduce the beam diagnostic results. Since August 2010 the test bench has been in operation in different configurations. Behind the RFQ a beamline comprising a phase-probe-based time-of-flight system and beam current measurement devices is set up. The aim is to determine the RFQ working point and to validate the optimizations in terms of particle transmission.  
 
WEPS070 Commissioning Status of Kolkata Superconducting Cyclotron cyclotron, acceleration, ion, injection 2664
 
  • C. Mallik, R.K. Bhandari
    DAE/VECC, Calcutta, India
 
  After completing the construction of the K~500 superconducting cyclotron at Kolkata, the internal beam acceleration was accomplished in August 2009 and several tests were conducted to confirm the acceleration. Earlier the superconducting magnet using Nb-Ti superconductor with 300 litre liquid helium cryostat and 80 tonne iron was commissioned and field mapped. The radiofrequency system spanning 9-27 MHz and with three independent resonators were integrated into the machine. Some difficulties were experienced with achieving the voltage related to ceramic failures. Finally, ~50 kV on the dees have been achieved with reasonable phase stability between the three dees. The cyclotron uses a 14 GHz external ECR ion source and the beam is injected through 28 metre long injection line. Till date several beams like neon, argon, nitrogen, oxygen etc. have been accelerated mostly in analogous mode and at around 14 MHz frequency and ~32 kG field. Valuable experience has been obtained with various systems. The paper would describe the experience with different subsystems and beam acceleration experience. Presently, beam extraction is being tried and will be achieved shortly.  
 
WEPS071 High Power, High Energy Cyclotrons for Muon Antineutrino Production: the DAEdALUS Project proton, cyclotron, target, beam-losses 2667
 
  • J.R. Alonso, T. Smidt
    MIT, Cambridge, Massachusetts, USA
 
  Neutrino physics is very much at the forefront of today's research. Large detectors installed in deep underground locations study neutrino masses, CP violation, and oscillations using neutrino-sources including long- and short-baseline beams of neutrinos from muons decaying in flight. DAEdALUS* looks at neutrinos from stopped muons, “Decay At Rest (DAR)” neutrinos. The DAR neutrino spectrum has no electron antineutrinos (nu-e-bar) (pi-minus are absorbed), so a detector with much hydrogen (water-Cherenkov or liquid scintillator) is sensitive to appearance of nu-e-bar’s oscillating from nu-mu-bar via inverse-beta-decay. Oscillations are studied using shorter baselines, less than 20 km reaching the same range as the current and planned high-energy neutrino lines at Fermilab. As the neutrino flux is not variable, nor is the energy, the baseline is varied, plans call for 3 accelerator-based neutrino sources at 1.5, 8 and 20 km with staggered beam-on cycles. Key is cost-effectively generating megawatt beams of 800 MeV protons. A superconducting ring cyclotron is being designed by L. Calabretta and his group**. This revolutionary design could find application in many ADS-related fields.
* DAEdALUS Expression of Interest, arXiv:1006.0260
** Calabretta et al., "A Superconducting Ring Cyclotron to Search for CP Violation in the Neutrino Sector", this conference
 
 
WEPS072 A Superconducting Ring Cyclotron to Search for CP Violation in the Neutrino Sector cavity, cyclotron, injection, focusing 2670
 
  • L.A.C. Piazza, M.M. Maggiore
    INFN/LNL, Legnaro (PD), Italy
  • L. Calabretta, D. Campo, D. Rifuggiato
    INFN/LNS, Catania, Italy
  • A. Calanna
    CSFNSM, Catania, Italy
 
  Multi Megawatt accelerators are today requested for different use. In particular the experiment DAEdALUS*, recently proposed by MIT scientist to search for CP violation in the neutrino sector, needs three accelerator with energy of about 800 MeV, average power of some MW and duty cycle of 20%. To reduce the cost of the accelerators a cyclotron complex consisting of an injector** and of a booster ring cyclotron has been proposed***. The booster Superconducting Ring Cyclotron, able to accelerate a H2+ molecule beam up to 800 MeV/n and average power higher than 1.6 MW, will be described. Although the average power is 1.6 MW, due to the low duty cycle, the peak power will be 8 MW. The main advantages to accelerate H2+ are a reduction of space charge effects, a simple extraction process, extraction of two beams at the same time from each booster cyclotron to simplify the beam dump. The features of the magnetic sector, of the superconducting coils and the magnetic forces evaluated by the code TOSCA are presented. The isochronous magnetic field, the beam dynamics along the injection and extraction path and during the acceleration are presented, too.
*J.Alonso etal., Novel Search for CP Violation in the Neutrino Sector: DAEdALUS, June2010;e-Print arXiv:1006.0260.
**L.Calabretta, IPAC 2011,this conference.
***L.Calabretta, Cyclotrons 2010, Lanzhou.
 
 
WEPS073 A Low Energy Cyclotron Injector for DAEdALUS Experiment cyclotron, proton, cavity, space-charge 2673
 
  • L.A.C. Piazza, M.M. Maggiore
    INFN/LNL, Legnaro (PD), Italy
  • L. Calabretta, D. Campo, D. Rifuggiato
    INFN/LNS, Catania, Italy
  • A. Calanna
    CSFNSM, Catania, Italy
 
  Multi Megawatt accelerators are today requested for different use. In particular the experiment DAEdALUS*, recently proposed by MIT scientist to search for CP violation in the neutrino sector, needs three accelerator with energy of about 800 MeV, average power of some MW and duty cycle of 20%. To reduce the cost of the accelerators a cyclotron complex consisting of an injector and of a booster ring cyclotron has been proposed**. The main characteristics of the new kind of a separated sector cyclotron injector able to accelerate a H2+ molecule beam up to 50 MeV/n will be presented. Due to the low duty cycle, the peak current to be accelerated is 5 mA. The problem related to the injection of a H2+ beam, delivered by a compact ion source, and to the space charge effects will be discussed. The main parameters of the magnetic sectors, RF cavities, the isochronous magnetic field and the beam dynamics along the injection and extraction path and during the acceleration will be presented, too.
* J. Alonso et al., “A Novel Search for CP Violation in the Neutrino Sector: DAEdALUS”, June 2010. e-Print: arXiv:1006.0260
** L. Calabretta et al., ICCA, Lanzhou 2010; http://www. JACoW.org.
 
 
WEPS078 Compact FFAG Accelerators for Medium Energy Hadron Applications proton, hadron, linac, injection 2688
 
  • B. Qin, Y. Ishi, Y. Kuriyama, J.-B. Lagrange, Y. Mori, K. Okabe, T. Uesugi, E. Yamakawa
    KURRI, Osaka, Japan
 
  Funding: This work was supported by Japan Science and Technology Agency under Strategic Promotion of Innovative Research and Development Program.
Medium energy hadron beams are widely applied in accelerator driven subcritical systems (ADSR), high intensity neutron sources and carbon therapy. Compactness feature is important for this energy region, especially in the case of medical use purposes. This paper introduces a novel superferric scheme with scaling fixed-field alternating gradient (FFAG) accelerators, which can deliver 400MeV/u carbon ions or 1.2GeV protons. By using high permeability materials, 5T magnetic field with high field index can be achieved to reduce accelerator circumference significantly. The lattice configuration and design of superferric magnet are described in details.
 
 
WEPS080 Development of High-quality Intense Proton Beam at the RCNP Cyclotron Facility proton, cyclotron, emittance, cavity 2694
 
  • M. Fukuda, K. Hatanaka, M. Kibayashi, S. Morinobu, K. Nagayama, T. Saito, H. Tamura, H. Ueda, H. Yamamoto, T. Yorita
    RCNP, Osaka, Japan
 
  A 2.45 GHz ECR proton source, equipped with a set of three permanent magnets, was developed to increase the intensity of a high-quality proton beam. A 15 keV proton beam with intensity of 0.6 mA was produced with a proton ratio of more than 80 %. Emittance of the proton beam with intensity of 50 to 100 micro-A in the LEBT system was around 50 pi-mm-mrad. Beam transmission, defined by the ratio of the beam intensity between a Faraday cup placed in the axial injection beam line and an inflector electrode of the AVF cyclotron, was improved from 25 % for a 70 micro-A proton beam to more than 90 % for 30 micro-A obtained by defining the injection beam with a beam slit of iris type. The result indicated that the beam transmission was limited by the acceptance of the axial injection beam line. Emittance of the 65 MeV proton beam accelerated by the K140 AVF cyclotron was a few pi-mm-mrad for beam intensity of several-micro-A. In this paper, development of the intense proton beam and evaluation of the proton beam quality will be mainly reported.  
 
WEPS082 Development of FLNR JINR Heavy Ion Accelerator Complex in the Next Seven Years: New DC-280 Cyclotron Project ion, cyclotron, injection, target 2700
 
  • G.G. Gulbekyan, S.L. Bogomolov, O.N. Borisov, S.N. Dmitriev, J. Franko, B. Gikal, I.A. Ivanenko, I.V. Kalagin, V.I. Kazacha, N.Yu. Kazarinov, N.F. Osipov, A. Tikhomirov
    JINR, Dubna, Moscow Region, Russia
 
  At present time four isochronous cyclotrons: U-400, U-400M, U-200 and IC-100 are in operation at the JINR FLNR. Total operation time is about 10000 hours per year. The U400M is a primary beam generator and U400 is as postaccelerator in RIB (DRIBs) experiments to produce and accelerate exotic nuclides such as 6He, 8He etc. One of the basic scientific programs which are carried out in FLNR - synthesis of new elements which demands intensive beams of heavy ions. Now U-400 is capable to provide long term experiments on Ca 48 beams with intensity of 1 pμA.In order to improve efficiency of the experiments for the next 7 years it is necessary to obtain the accelerated ion beams with the following parameters. Ion energy 4/8 MeV/n Masses 10/238 Beam intensity (up to A=50) 10 pμA Beam emittance less 30 π mm·mrad These parameters have underlain the project of new cyclotron DC-280.  
 
WEPS085 Deveopment of the IBA-JINR Cyclotron C235-V3 for Dmitrovgrad Hospital Center of the Proton Therapy proton, cyclotron, betatron, septum 2706
 
  • E. Syresin, G.A. Karamysheva, M.Y. Kazarinov, S.A. Kostromin, N.A. Morozov, A.G. Olshevsky, V.M. Romanov, E. Samsonov, N.G. Shakun, G. Shirkov, S.G. Shirkov
    JINR, Dubna, Moscow Region, Russia
  • M. Abs, A. Blondin, P. Cahay, Y. Jongen, W.J.G.M. Kleeven, S. Zaremba
    IBA, Louvain-la-Neuve, Belgium
 
  The approval of the Dmitrovgrad project - the first Russian hospital center of the proton therapy was announced in 2010. The JINR-IBA collaboration have developed and constructed the proton cyclotron C235-V3 for this center. We plan to assemble this cyclotron in JINR in 2011 and perform tests with the extracted proton beam in 2012. This cyclotron is an essentially modified version of IBA C235 cyclotron. Modification of the extraction system is aim of new C235-V3 cyclotron. The new extraction system was constructed and tested. The experimentally measured extraction efficiency was improved from 60% for the old system to 77% for the new one. The new field mapping system was developed for the C235-V3 cyclotron. It system consists of the axial field mapping system and an additional system applied for radial field Br measurements. One of the goals of the cyclotron improvement is the modification of the sector spiral angle for reducing of coherent beam losses at acceleration. The coherent beam displacement from the median plane is defined by the vertical betatron tune Qz. An increase of the vertical betatron tune permits to reduce the coherent losses at proton acceleration.  
 
WEPS094 Dynamic Vacuum Stability in SIS100 ion, vacuum, cryogenics, beam-losses 2724
 
  • P. Puppel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • P.J. Spiller
    GSI, Darmstadt, Germany
 
  SIS100 is the main synchrotron of the FAIR project. It is designed to accelerate high intensity intermediate charge state uranium beams from 200 MeV/u up to 2.7 GeV/u. Intermediate charge state heavy ions are exposed to a high probability of charge exchange due to collisions with residual gas molecules. Since the charge exchange process changes the magnetic rigidity, the involved ions are lost behind dispersive elements, and an energy-dependent gas desorption takes place. The StrahlSim code has been used to predict the stability of the residual gas pressure in SIS100 under beam loss driven dynamic conditions. The results show, that a stable operation at highest U28+ intensities is possible, under the constraint that the vacuum chambers of the ion catcher system are cold enough to pump hydrogen. Furthermore, in order to determine the load to the cryogenic system, the average beam energy deposition onto the ion catcher system has been calculated.  
 
WEPS099 Physics Design of CSNS RCS Injection and Extraction System injection, kicker, septum, emittance 2739
 
  • J. Qiu, N. Huang, J. Tang, S. Wang
    IHEP Beijing, Beijing, People's Republic of China
 
  In this paper, the injection and extraction system design for CSNS RCS are discussed. The injection system is designed to place all the injection devices in one uninterrupted long drift in one of the four dispersion free straight sections. Painting bumper magnets are used for both horizontal and vertical phase space painting. The beam extraction process from the CSNS RCS is a single turn two step process, requiring a group of kickers and a Lambertson septum magnet.  
 
THOAA01 Beam Diagnostics Commissioning at CNAO proton, synchrotron, diagnostics, quadrupole 2848
 
  • H. Caracciolo, G. Balbinot, G. Bazzano, J. Bosser, M. Caldara, A. Parravicini, M. Pullia, C. Viviani
    CNAO Foundation, Milan, Italy
 
  The National Centre for Oncological Hadrontherapy (CNAO) is the first Italian facility for the treatment of deep located tumors with proton and carbon ion beams using active scanning. The commissioning with proton beams is concluded and CNAO is going to start treating patients with protons; in the meantime the machine commissioning with carbon ions beam is going on. Beam diagnostics instrumentation is fundamental to measure beam properties along the lines from sources to patients. Some significant measurements performed during proton beam commissioning and the performances achieved with the CNAO beam diagnostic systems are presented in this paper.  
slides icon Slides THOAA01 [4.827 MB]  
 
THOAA02 Implementation of an Intensity Feedback-loop for an Ion-therapy Synchrotron feedback, controls, ion, synchrotron 2851
 
  • C. Schömers, E. Feldmeier, Th. Haberer, J. Naumann, R.E. Panse, A. Peters
    HIT, Heidelberg, Germany
 
  The Heidelberg Ion Therapy-Centre (HIT) started treatment of tumour patients in 2009. Its main acceleration stage is a synchrotron, where particles are extracted slowly, in the time frame of some seconds, to support the raster-scanning method. The slow extraction is driven by the transverse "RF-nockout-exciter". So far, this device has a variable but predefined amplitude curve. As the phase-space distribution of particles is not homogeneous and varies slightly from pulse to pulse, intensity-fluctuations of the extracted beam appear. Moreover, changing accelerator-settings requires a time-consuming re-adjustment of the exciter to achieve adequate beam-properties again. To keep the intensity on a predefined level, a feedback loop will be implemented. The actual-value of the intensity is provided by an ionization chamber in front of the patient. The feedback loop controls the amplitude of the Exciter, to adapt the number of extracted particles. Beside a rectangular spill with constant intensity, a dynamic intensity-adaptation during one spill with respect to the particular treatment-plan will be investigated. First tests for flat spill and variable intensity showed promising results.  
slides icon Slides THOAA02 [2.284 MB]  
 
THPPA01 EPS-AG Sacherer Prize: Beam Optics Developments for SPS, RHIC, LHC, CLIC and ATF2 resonance, sextupole, optics, dipole 2894
 
  • R. Tomás
    CERN, Geneva, Switzerland
 
  Highlights of linear and nonlinear optics studies are presented from various accelerators. At the LHC, optics correction is of critical importance to guarantee safe beam operation. Preparation for LHC optics measurements and corrections has been a major activity during the last decade. In particular, SPS and RHIC have served as excellent research and development machines to test new techniques and instrumentation, such as the measurement of resonance driving terms with and without AC dipoles. Together with a meticulous field quality specification, a careful installation strategy and an elaborate magnet model, these efforts have paid off in the LHC, where a record low beta-beating for hadron colliders below 10% has been achieved. Looking further into the future, the performance of the Final Focus System (FFS) is of critical importance for a future linear collider like CLIC, since it determines the IP beam spot sizes. The large chromatic aberrations required the development of novel non-linear optimization methods. Such techniques have successfully increased the CLIC design luminosity by 70% and an experimental test has been proposed for ATF2 to halve the design IP beam spot sizes.  
slides icon Slides THPPA01 [1.514 MB]  
 
THPC003 Installation of the ASTRID2 Synchrotron Light Source kicker, dipole, cavity, vacuum 2909
 
  • J.S. Nielsen, N. Hertel, S.P. Møller
    ISA, Aarhus, Denmark
 
  ASTRID2 is the new 10 nm UV and soft x-ray light source being built at Aarhus University, to replace the aging source ASTRID. ASTRID2 is now in the middle of its installation. An update of the design will be presented. Almost all components have now been acquired and received. Several choices and solutions of hardware will be described, and future commissioning plans outlined. Commissioning is expected to take place in the winter 2011/2012.  
 
THPO027 Novel Switching Power Supply utilizing SiC-JFET and its Potential for the Digital Accelerator power-supply, induction, synchrotron, high-voltage 3400
 
  • K. Okamura, T. Iwashita, K. Takayama, M. Wake
    KEK, Ibaraki, Japan
  • K. Ise
    Tohoku Electric Power Co., Sendai, Japan
  • Y. Osawa
    SUN-A Corporation, Miyoshi-City, Japan
  • K. Takaki
    Iwate university, Morioka, Iwate, Japan
 
  Funding: Japan Science and Technology Agency
New induction synchrotron system using an induction cell has been developed and constructed at KEK*. We refer to the accelerator using the induction acceleration system combined with digitally controlled PWM power supply as "Digital Accelerator". In that system, the switching power supply is one of the key devices which realize digital acceleration. The requirements of the switching power supply are high voltage (2 kV) and high repetition frequency (1 MHz). In the present system, we used series connected MOSFETs as the switching device and obtained successful operation. However, series connection gives large complexity and less reliability. Among the various switching devices, a SiC-JFET is the promising candidates that substitute existing silicon MOSFET because it has ultrafast switching speed and voltage blocking capability**. Therefore, we have started to develop new device in collaboration with device manufacturers. Switching and heat removal performance of the newly developed SiC-JFET and a future plan will be presented at the conference.
* T. Iwashita et al., “KEK Digital Accelerator”, Phys. Rev. ST-AB, published in 2011.
** K. Ise et al., IEEE Trans. Plasma Sci., pp. 730-736 (2011).
 
 
THPO034 Optimization of a Dual One-turn Coils Kicker Magnet System kicker, synchrotron, monitoring, vacuum 3415
 
  • K.L. Tsai, C.-T. Chen, C.-S. Fann, S.Y. Hsu, Y.D. Li, K.-K. Lin, K.-B. Liu, H.M. Shih, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
 
  Optimization of a dual one-turn coils configuration for fast kicker magnet system is presented in this report. Emphasis has been made on the: 1) optimization of various possible coils arrangement restricted by the existing available hardware; and 2) synchronization between pulsed currents delivering on the respective upper and lower coils. In the consideration of coils arrangement, good field region is utilized as the guiding parameter while adjusting fixture gap between the coils. As for coil currents timing optimization, fast rise-time and pulse shape preservation are used for practical implementation purpose. Both numerical analysis and experimental data will be presented and discussed.  
 
THPS021 Methods to Obtain High Intensity Proton Ion Beams with Low Emittance from ECR Ion Source at Peking University ion, plasma, ion-source, emittance 3463
 
  • H.T. Ren
    Graduate University, Chinese Academy of Sciences, Beijing, People's Republic of China
  • J.E. Chen, Z.Y. Guo, P.N. Lu, S.X. Peng, Z.Z. Song, J.X. Yu, M. Zhang, J. Zhao, Q.F. Zhou
    PKU/IHIP, Beijing, People's Republic of China
 
  Funding: Supported by the National Science Foundation of China 11075008.
With the development of accelerator technology, to obtain an ion beam with high intensity and low emittance is becoming one of the main goals of research for ion sources. At Peking University we have developed several 2.45 GHz electron cyclotron resonance (ECR) ion sources for different projects and we paid close attention to the beam intensity increasing as well as the beam emittance reduction. Methods are adopted to improve beam intensity by increasing the density of plasma inside the discharge chamber, optimizing the geometry pinch effect and the perveance at the extraction aperture. To suppress the emmitance increasing of an extracted beam, the shape of the electrodes as well as the voltage of suppression electrode are carefully selected With these efforts, a 120 mA total proton beam has been extracted from the permanent magnet ECR ion source at 50 kV, and the measured normalized rms emittance is less than 0.2 pi.mm.mrad. The beam current density at the extraction aperture is about 420 mA/cm2.
 
 
THPS026 Surface Plasma H Ion Source with Saddle RF Antenna Plasma Generator plasma, ion, gun, ion-source 3475
 
  • V.G. Dudnikov, R.P. Johnson
    Muons, Inc, Batavia, USA
  • S.N. Murray, T.R. Pennisi, M. Santana, M.P. Stockli, R.F. Welton
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: *Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690.
In this project is developed a prototype RF H surface plasma source (SPS) with saddle (SA) RF antenna which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability. Several versions of new plasma generators with a small AlN test chamber and different antennas and magnetic field configurations were tested in the SNS ion source Test Stand. A prototype SA SPS was installed in the Test Stand with a larger, normal-sized SNS AlN chamber that achieved unanalyzed peak currents of up to 67 mA with an apparent efficiency of 1.6 mA/kW. Control experiments with H beam produced by SNS SPS with internal and external antennas were conducted. A new version of the RF triggering plasma source (TPS) has been designed. A Saddle antenna SPS with water cooling is being fabricated for high duty factor testing.
 
 
THPS029 Simulations of Various Driving Mechisms for the 3rd Order Resonant Extraction from the MedAustron Medical Synchrotron betatron, lattice, synchrotron, resonance 3481
 
  • G. Feldbauer, M. Benedikt
    CERN, Geneva, Switzerland
  • U. Dorda
    EBG MedAustron, Wr. Neustadt, Austria
 
  The MedAustron medical synchrotron is based on the CERN-PIMMS design and its technical implementation by CNAO [1]. This document elaborates on studies performed on the baseline betatron-core driven extraction method and investigates the feasibility of alternative resonance driving mechanisms like RF-knockout, RF-noise and the lattice tune. Single particle tracking results are presented, explained and compared to analytical results.
[1] M. Pullia, ‘‘Status Report on the Centro Nazionale di Adroterapia Oncologica (CNAO)'', 11th EPAC'08, Genoa, Itlay, June 2008, p. 982
 
 
THPS030 Layout and Optics of the MedAustron High Energy Beam Transfer Line optics, proton, synchrotron, quadrupole 3484
 
  • U. Dorda, P.J. Bryant
    CERN, Geneva, Switzerland
  • M. Benedikt
    EBG MedAustron, Wr. Neustadt, Austria
 
  The MedAustron accelerator complex, which is currently in its final design stage at CERN, is based on the optical principles developed within the Proton Ion Medical Machine study (PIMMS) [bryantpimms]. This paper describes how these principles are practically applied in the layout and optics of the High Energy Beam Transfer line (HEBT) of the MedAustron accelerator facility. Special attention is directed to the optics of the gantry which is designed to fit into the PSI gantry-2 hardware layout, which is foreseen to be copied in collaboration with PSI.  
 
THPS039 Diffusion of a Circulating Beam by the RF-Knockout with a Spectrum including Many Bands synchrotron, resonance, simulation, controls 3508
 
  • M. Tashiro, T. Nakanishi
    Nihon University, Narashino, Chiba, Japan
 
  The fast control of beam spill extracted from a synchrotron is a key function for the spot scanning irradiation in cancer therapy application. The authors have proposed the extraction method for the application which uses the control of a quadruple field of fast response as well as the RFKO (QAR method). The RF signal for the RFKO should cover a frequency band corresponding to a tune spread. A simulation with continuous RFKO operation, however, showed a spill intensity changes with time largely with only this band. The large change of spill is due to not uniform diffusion of circulating beam and it makes a constant spill difficult in the QAR method. A wider band gives a uniform spill, but it requires a larger Amp power. We proposed a spectrum including many bands around the resonances to reduce the power, since the bands outside around the resonances do not contribute to the diffusion. Such a spectrum has also an advantage to increase spill intensity for the QAR method, using a band so that the RFKO diffuses more inside particles of the separatrix but also it affects little them near the boundary. We can extract several times particles with a same shrink ratio of the separatrix.  
 
THPS040 Measurement of the Stripping Efficiency for HBC Stripper Foil in the 3-GeV RCS of J-PARC injection, proton, beam-losses, scattering 3511
 
  • P.K. Saha, H. Harada, S. Hatakeyama, H. Hotchi, M. Kinsho, Y. Yamazaki, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Irie, I. Sugai
    KEK, Ibaraki, Japan
 
  We have carried out experimental measurement of the stripping efficiency for the newly developed HBC (Hybrid type Boron doped Carbon) stripper foils. The HBC foil is used for charge-exchange injection in the RCS (Rapid Cycling Synchrotron) of J-PARC (Japan Proton Accelerator Research Complex) and plays an important role for the RCS operation. We have developed a rather simple but very precise method using which stripping efficiencies for several HBC foils were determined accurately. Importance of knowing an accurate stripping efficiency so as to determine a realistic stripper foil for the RCS operation will be discussed.  
 
THPS042 Feasibility Studies of the Foil Scattering Extraction in CSNS/RCS scattering, beam-losses, simulation, proton 3517
 
  • N. Wang, M.Y. Huang, N. Huang, S. Wang
    IHEP Beijing, Beijing, People's Republic of China
 
  A slow extraction based on foil scattering was suggested in the rapid cycling synchrotron of China Spallation Neutron Source for particle calibration. Protons with large scattering angle will be extracted during 2 ms at the end of each beam cycle, via a carbon foil. The feasibility of the extraction scheme is investigated. The extraction efficiency is studied by both single turn and multi-turn simulations with FLUKA and ORBIT, respectively. Beam losses due to multiple scattering to the downstream components are predicted.  
 
THPS045 Beam Emittance Measurement in the Injection Beam Line for a Cyclotron Accelerator Mass Spectrometer cyclotron, injection, ion, emittance 3523
 
  • D.G. Kim, H.-C. Bhang
    SNU, Seoul, Republic of Korea
  • J.-W. Kim
    NCC, Korea, Kyonggi, Republic of Korea
 
  Funding: This work was supported by National Research Foundation of Korea (NRF) Grant No. 20110018946, and also by World Class University project of the NRF.
A carbon beam was extracted and measured in the injection beam line built for an accelerator mass spectrometer (AMS) based on a cyclotron. The cyclotron AMS has been designed to realize a compact AMS having a mass resolving power of around 4000 for a negative 14C beam. The beam line is a prototype to ensure the capability to match the beam phase space with the acceptance of the cyclotron. The injection beam line consists of an ion source, Einzel lens, rf buncher, 90 degree dipole magnet and a beam diagnostic box with a slit system. The ion source with a hot filament is a commercial product, and all other elements were designed and built in house. Some measurement results of the beam line components as well as beam emittance will be presented.
 
 
THPS047 New Injection and Extraction at CRYRING for FLAIR injection, septum, ion, kicker 3529
 
  • A. Simonsson, L. Brännholm, S. Das, A. Källberg, P. Löfgren, A. Paal, J. Sjöholm
    MSL, Stockholm, Sweden
  • H. Danared
    ESS, Lund, Sweden
  • D. Reistad
    Intégro Utbildnings AB, Sigtuna, Sweden
 
  As a preparation for a future transfer of CRYRING to FLAIR at FAIR in Darmstadt, Germany, we have installed and tested a slow extraction system. At FLAIR CRYRING will be used for deceleration of antiprotons from 30 MeV to 0.3 MeV. The tests of the slow extraction show that the beam can be extracted during 2 s with 30-60% efficiency and with rather constant amplitude, apart from noise from 50 Hz harmonics. A new injection system has also been designed. It will be able to inject 30 MeV antiprotons from NESR as well as 0.3 MeV/u ions created in a separate ion source and accelerated in an RFQ.  
 
THPS054 Injection and Extraction Considerations for a 2 GeV RCS at CERN injection, quadrupole, septum, kicker 3550
 
  • W. Bartmann, B. Balhan, J. Borburgh, L. Ducimetière, M. Fitterer, B. Goddard, L. Sermeus
    CERN, Geneva, Switzerland
 
  Conceptual studies have been made for a 2 GeV RCS at CERN as a possible replacement of the four-ring PS Booster. The lattice design has to accommodate suitable straight sections for a 160 MeV H charge exchange injection system, and for a 2 GeV fast extraction system. The design constraints for the injection and extraction systems are described, together with the proposed concepts and potential equipment limitations. In particular, the features of different possible H injection configurations are compared.  
 
THPS058 Third Integer Resonance Slow Extraction Using RFKO at High Space Charge. resonance, dipole, betatron, space-charge 3559
 
  • V.P. Nagaslaev, J.F. Amundson, J.A. Johnstone, C.S. Park, S.J. Werkema
    Fermilab, Batavia, USA
 
  A proposal to search for direct mu->e conversion at Fermilab requires slow, resonant extraction of an intense proton beam. Large space charge forces will present challenges, partly due to the substantial betatron tune spread. The main challenges will be maintaining a uniform spill shape and moderate losses at the septum. We propose to use "radio frequency knockout" (RFKO) for fine tuning the extraction. Strategies for the RFKO method will be discussed here in the context of the mu->e experiment. Feasibility of this method has been demonstrated using simulations.  
 
THPS066 Technical Overview of the SIEMENS Particle Therapy Accelerator ion, synchrotron, proton, linac 3577
 
  • V. Lazarev, O. Chubarov, S. Emhofer, G. Franzini, S. Göller, B. Nagorny, A. Robin, H. Rohdjess, R. Rottenbach, A.C. Sauer, R. Schedler, T. Sieber, B. Steiner, J. Tacke, D.B. Thorn, T. Uhl, P. Urschütz, O. Wilhelmi
    Siemens Med, Erlangen, Germany
  • M. Budde, J.S. Gretlund, H.B. Jeppesen, C.V. Nielsen, C.G. Pedersen, Ka.T. Therkildsen, S.V. Weber
    Siemens DK, Jyllinge, Denmark
 
  Siemens has developed an accelerator system for particle therapy. It consists of an injector (7 MeV/u protons and light ions) and a compact synchrotron able to accelerate proton beams up to 250 MeV and carbon ions up to 430 MeV/u. These beams are extracted slowly from the synchrotron and delivered to a number of beam ports. The first accelerator system has been built and commissioned up to the first two beam outlets. An overview of the achieved performance of the system is presented.
*Particle therapy is a work in progress and requires country-specific regulatory approval prior to clinical use.
 
 
THPS070 Status Report of the CNAO Construction and Commissioning proton, synchrotron, ion, linac 3589
 
  • M. Pullia
    CNAO Foundation, Milan, Italy
 
  The CNAO (National Center for Oncological Hadrontherapy) is the first Italian center for deep hadrontherapy. The main accelerator is a synchrotron, based on the PIMMS design, capable to accelerate carbon ions up to 400 MeV/u and protons up to 250 MeV. Four treatment lines, in three treatment rooms, are foreseen in a first stage. The CNAO facility, has been designed for a completely active beam delivery system, in which a pencil beam is scanned transversely and the extracted beam energy can be changed on a spill to spill basis. The commissioning of the synchrotron started in August 2010. At the beginning of 2011 the first Spread Out Bragg Peaks with proton beams in the energy range 120-170 MeV/u, matching the first foreseen treatments, have been measured. The commissioning of the machine with protons has now been completed and authorisation to treatment of patients has been obtained from the competent authorities. The commissioning with carbon ions is in progress.  
 
THPS071 The HIMAC Beam-intensity Control System for Heavy-ion Scanning controls, feedback, status, ion 3592
 
  • K. Mizushima
    Chiba University, Graduate School of Science and Technology, Chiba, Japan
  • T. Furukawa, Y. Iwata, K. Katagiri, K. Noda, S. Sato, T. Shirai
    NIRS, Chiba-shi, Japan
  • E. Takeshita
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
 
  Raster scanning irradiation has been carried out at a HIMAC new treatment facility in NIRS. In order to reduce the difference between prescribed and delivered dose distribution, the accurate beam-intensity control with a low ripple and the fast beam-on/off switching are strongly required. For this purpose, we have developed a new beam-intensity control system using the RF-knockout slow extraction. To keep the beam rate constant, this system controls the transverse RF voltage with the feedback proportional-integral control. In addition, the beam-on/off response was improved by the fast quadrupole magnets and the implementation of the transverse beam preheating method. As a result of the system commissioning, it was verified that this system can modulate the beam-intensity with a low ripple and switch the beam-on/off with quick responses. We will report the result in detail.  
 
THPS080 The New Bern Cyclotron Laboratory for Radioisotope Production and Research cyclotron, target, proton, radiation 3618
 
  • S. Braccini, A. Ereditato
    LHEP, Bern, Switzerland
  • P. Scampoli
    Naples University Federico II, Napoli, Italy
  • K. von Bremen
    SWAN, Bern, Switzerland
 
  A new cyclotron laboratory for radioisotope production and multi-disciplinary research is under construction in Bern and will be operational by the end of 2011. A commercial IBA 18 MeV proton cyclotron, equipped with a specifically conceived 6 m long external beam line, ending in a separate bunker, will provide beams for routine 18-F production as well as for novel detector, radiation biophysics, radioprotection, radiochemistry and radiopharmacy developments. The accelerator is embedded into a complex building which hosts two physics laboratories, four GMP radiochemistry and radiopharmacy laboratories, offices and two floors for patient treatment and clinical research activities. This project is the result of a successful collaboration among the University Hospital in Bern (Inselspital), the University of Bern and private investors, aiming at the constitution of a combined medical and research center able to provide the most cutting-edge technologies in medical imaging and cancer radiation therapy. For this purpose, the establishment of a proton therapy center on the campus of Inselspital is in the phase of advanced study.  
 
THPS082 Dose-homogeneity Driven Beam Delivery System Performance Requirements for MedAustron proton, ion, target, scattering 3624
 
  • M. Palm, F. Moser
    CERN, Geneva, Switzerland
  • M. Benedikt, A. Fabich
    EBG MedAustron, Wr. Neustadt, Austria
  • M. Palm
    ATI, Wien, Austria
 
  MedAustron, the Austrian hadron therapy center is currently under construction. Irradiation will be performed using active scanning with proton or carbon ion pencil beams. Major beam delivery system contributors to dose heterogeneities during active scanning are evaluated: beam position, beam size and spot weight errors. Their individual and combined effect on the dose distribution is quantified, using semi-analytical models of lateral beam spread in the nozzle and target and depth-dose curves for protons and carbon ions. Deduced requirements on critical parts of the beam delivery system are presented. Preventive and active methods to suppress the impact of beam delivery inaccuracies are proposed.  
 
THPS088 LHC Beam Impact on Materials Considering the Time Structure of the Beam target, proton, simulation, kicker 3639
 
  • N.A. Tahir
    GSI, Darmstadt, Germany
  • J. Blanco, R. Schmidt
    CERN, Geneva, Switzerland
  • R. Piriz
    Universidad de Castilla-La Mancha, Ciudad Real, Spain
  • A. Shutov
    IPCP, Chernogolovka, Moscow region, Russia
 
  The LHC is the world's largest and highest energy accelerator. Two counter-rotating beams can be accelerated up to 7 TeV and kept colliding for several hours. The energy stored in each beam is up to 362MJ, enough to melt 500 kg of copper. A fast loss of a small fraction of the beam can cause damage to a superconducting coil in a magnet. Primary beam collimators, one of the most robust parts of the machine protection, can be damaged with about 5% of the beam. An accident involving the entire beam is very unlikely but cannot be fully excluded. Understanding the consequences of such accidents is fundamental for the machine protection. Detailed numerical simulations have been carried out to assess the damage caused by full LHC beam impact on solid Cu and C cylinders. The energy loss of the protons is calculated with the FLUKA code and this data is used as input to a 2D hydrodynamic code BIG2, to study the thermodynamic and hydrodynamic response of the material. Since the target parameters change substantially during the time of impact, a new approach of running the two codes iteratively, has been developed. In this paper the results are presented and compared with the previous studies.  
 
THPZ025 Stability of the LHC Transfer lines injection, ion, kicker, controls 3741
 
  • V. Kain, W. Bartmann, C. Bracco, L.N. Drosdal, B. Goddard, M. Meddahi, J.A. Uythoven, J. Wenninger
    CERN, Geneva, Switzerland
 
  The LHC is filled from the SPS through two 3 km transfer lines. The injected beam parameters need to be well under control for luminosity performance, machine protection and operational efficiency. Small fractions of beam loss on the transfer line collimation system create showers which can trigger the sensitive LHC beam loss monitor system nearby and cause a beam abort during filling. The stability of the transfer line trajectory through the collimators is particularly critical in this respect. This paper will report on the transfer line trajectory stability during the proton run in 2011, correlations with injection losses, correction frequency and the most likely sources for the observed oscillations.