Keyword: rfq
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SUPB012 Status of CH Cavity and Solenoid Design of the 17 MeV Injector for MYRRHA solenoid, cavity, focusing, quadrupole 29
 
  • D. Mäder, H. Klein, H. Podlech, U. Ratzinger, C. Zhang
    IAP, Frankfurt am Main, Germany
  
  Funding: This work has been supported by the EU (FP7 MAX contract number 269565)
The multifunctional subcritical reactor MYRRHA (Multi-purpose hybrid research reactor for high-tech applications) will be an accelerator driven system (ADS) located in Mol (Belgium). The first accelerating section up to 17 MeV is operated at 176 MHz and consists of a 4-rod-RFQ followed by two room temperature CH cavities with integrated triplet lenses and four superconducting CH structures with intertank solenoids. Each room temperature CH cavity provides about 1 MV effective voltage gain using less than 30 kW of RF power. The superconducting resonators have been optimized for electric peak fields below 30 MV/m and magnetic peak fields below 30 mT. For save operation of the superconducting resonators the magnetic field of the intertank solenoids has to be well shielded towards the CH cavity walls. Different coil geometries have been compared to find the ideal solenoid layout. 		 
 
SUPB013 The Beam Commissioning Plan of Injector II in C-ADS cavity, proton, simulation, diagnostics 32
 
  • Z.J. Wang, Y. He, H. Jia, C. Li, S.H. Liu, W. Wu, X.B. Xu, B. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  The design work of the Injector II, which is 10 MeV proton linac, in C-ADS project is being finished and some key elements are being fabricated. Now it is necessary to definite the operation mode of beam commissioning, including the selection of the beam current, pulse length and repetition frequency. Also the beam commissions plan should be specified. The beam commissions procedures is simulated with t-mode code GPT. In this paper, the general beam commissioning plan of Injector II in CIADS and simulation results of commissions procedures are presented.  
 
SUPB014 RF Setup of the MedAustron RFQ resonance, simulation, ion, pick-up 35
 
  • B. Koubek, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main, Germany
  • J. Haeuser
    Kress GmbH, Biebergemuend, Germany
  
  A Radio Frequency Quadrupole (RFQ) was built for the injector of the cancer treatment facility MedAuston in Austria. For the RF design simulations were performed using CST Microwave Studio and the structure was manufactured by Firma Kress in Biebergemuend, Germany. The simulations and the RF setup of the delivered RFQ are presented in this paper.  
 
SUPB015 Production and Quality Control of the First Modules of the IFMIF-EVEDA RFQ cavity, survey, controls, coupling 38
 
  • F. Scantamburlo, R. Dima, A. Pepato
    INFN- Sez. di Padova, Padova, Italy
  • C. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  
  The IFMIF-EVEDA RFQ, designed to accelerate a 125 mA D+ beam from the initial energy of 0.1 MeV to the final energy of 5 MeV at the frequency of 175 MHz, consists of 18 mechanical modules whose length is approximately 54 cm each. The production of the modules has started and, in particular, the modules 16, 17, 15 and 11, plus the prototype modules 1 and 2 have undergone all the production steps, including precision milling and brazing. In this article, the progress of the production, and the quality control during the phases of the production of the modules will be described.  
 
SUPB016 RFQ With Improved Energy Gain simulation, acceleration, ion, emittance 41
 
  • A. Kolomiets
    ITEP, Moscow, Russia
  • A.S. Plastun
    MEPhI, Moscow, Russia
  
  RFQ structure is practically only one choice for using in front ends of ion linacs for acceleration up to energy about 3 MeV. This limit is due to its relatively low acceleration efficiency. However it isn’t intrinsic feature of RFQ principle. It is defined only by vane geometry of conventional RFQ structure with sinusoidal modulation of vanes. The paper presents results of analysis RFQ with modified vane geometries that allow to improve acceleration efficiency. RFQ with modified vanes was used for design second section of heavy ion injector of TWAC for acceleration of ions with Z/A = 0.33 up to 7 MeV/u.  
 
SUPB017 Tuning Studies on 4-rod-RFQs simulation, linac, resonance, coupling 44
 
  • J.S. Schmidt, B. Klump, B. Koubek, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  A NI LabVIEW based Tuning Software has been devel- oped to structure the tuning process of 4-rod Radio Fre- quency Quadrupole s (RFQs). Its results are compared to measurement data of 4-rod RFQs in different frequency ranges. For the optimization of RFQ design parameters, a certain voltage distribution along the electrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very important for the beam dynamic prop- erties of an RFQ. A variation can lead to particle losses and reduced beam quality especially at higher frequencies. Our electrode design usually implies a constant longitudi- nal voltage distribution. For its adjustment tuning plates are used between the stems of the 4-rod-RFQ. These pre- dictions are based, in contrast to other simulations, on mea- surements to define the characteristics of the RFQ as it was build - not depending on assumptions of the design. This will lead to a totally new structured process of tuning 4- rod-RFQs in a broad range of frequencies by using the pre- dictions of a software. The results of these studies are pre- sented in this paper.  
 
SUPB037 The Development of Timing Control System for RFQ controls, EPICS, proton, background 89
 
  • J.N. Bai, S. Xiao, T.G. Xu, L. Zeng
    IHEP, Beijing, People's Republic of China
  
  A Timing control system based on VME configuration is developed to meet the need of 3.5 MeV RFQ. An EPICS driver is provided to control its work. The timing control system satisfies request after examination. In the future, it will be used in the machine running. This paper introduces the Timing control hardware, VME interface, EPICS driver for Timing control system and MEDM operator interface.  
 
MO3A02 Commissioning of a New Injector for the RIKEN RI-Beam Factory DTL, cyclotron, cavity, injection 125
 
  • N. Sakamoto, M. Fujimaki, H. Hasebe, Y. Higurashi, O. Kamigaito, H. Okuno, K. Suda, T. Watanabe, K. Yamada
    RIKEN Nishina Center, Wako, Japan
  • R. Koyama
    SHI Accelerator Service Ltd., Tokyo, Japan
  
  A new injector for the RIKEN RI-Beam Factory (RIBF) has been fully commissioned since October 2011. The injector accelerates ions of m/q=6.8 up to 670 keV/u. In order to save the cost and space, a direct coupling scheme was adopted for rf coupling between the cavity and amplifier, based on an elaborate design with the Microwave Studio code. It has worked out very stably in these three months, making the uranium beam intensity higher by one order of magnitude. Moreover, it is now possible to operate the RIBF and GARIS facility for the super-heavy element synthesis independently.  
slides icon Slides MO3A02 [19.503 MB]  
 
MO3A03 FRANZ – Accelerator Test Bench and Neutron Source proton, neutron, ion, space-charge 130
 
  • O. Meusel, L.P. Chau, M. Heilmann, H. Podlech, U. Ratzinger, K. Volk, C. Wiesner
    IAP, Frankfurt am Main, Germany
  
  The challenge of existing and planned neutron sources is to provide highly brilliant ion beams with high reliability. The Frankfurt neutron source FRANZ is not only a neutron source but also a test bench for novel accelerator and diagnostic concepts for intense ion beams. The experiment consists of a compact linear accelerator test bench for the acceleration of an intense proton beam to 2 MeV producing the neutrons via the 7Li(p,n) reaction. The final beam intensity will be 200 mA, therefore the space charge and space charge compensation effects can be studied with high statistical relevance along the accelerator. The low energy beam transport LEBT is equipped with four solenoids matching the beam into the chopper system and into the RFQ-IH combination already under construction. The coupling of the RFQ accelerator stage and the IH drift tube cavity offers the possibility to use only one power amplifier as a driver for both of these resonators and reduces investment costs. The compact design of this low-β accelerator stage is optimized for high beam intensities to overcome the strong space charge forces expected in this accelerator test bench.  
 
MOPB088 Fabrication Tests for IMP 162.5 MHz RFQ vacuum, cavity, gun, linac 381
 
  • B. Zhang
    IMP, Lanzhou, People's Republic of China
  
  The RFQ for one of front ends of C-ADS is designed. The frequency of the RFQ is 162.5 MHz and the energy is 2.1 MeV. The beam intensity is 15 mA and it works at CW mode. Because of low frequency, the four-wing structure is big size. It makes fabrication will take more risks. Therefore, four fabrication testing were planned and done to minimize the technic risks. The description about fabrication and testing results are presented in the paper.  
 
TU1A01 Status of the IFMIF-EVEDA 9 MeV 125 mA Deuteron Linac cavity, linac, solenoid, SRF 407
 
  • A. Mosnier
    Fusion for Energy, Garching, Germany
  
  The scope of IFMIF/EVEDA has been recently revised to set priority on the validation activities, especially on the Accelerator Prototype (LIPAc) with extending the duration up to mid 2017 in order to better fit the development of the challenging components and the commissioning of the whole accelerator. The present status of LIPAc, currently under construction at Rokkasho in Japan, outlines of the engineering design and of the developments of the major components will be reported. In conclusion, the expected outcomes of the engineering work, associated with the experimental program will be presented.  
slides icon Slides TU1A01 [7.602 MB]  
 
TU1A03 Chinese ADS Project and Proton Accelerator Development proton, linac, target, neutron 412
 
  • Y.L. Chi, S. Fu, W.M. Pan, P. Sha
    IHEP, Beijing, People's Republic of China
  • Q.Z. Xing
    TUB, Beijing, People's Republic of China
  
  Interest in the feasibility of ADS has increased dramatically in the last decade. This talk will briefly introduce the technologies presently available for ADS applications and provide a review of the ongoing R&D and construction activities in China, with particular emphasis on the challenges presented by the development of a high intensity, SRF CW proton Linac.  
slides icon Slides TU1A03 [3.803 MB]  
 
TUPLB08 R&D Towards CW Ion Linacs at ANL cryomodule, cavity, ion, acceleration 461
 
  • P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.V. Kutsaev, J.W. Morgan, R.C. Murphy, B. Mustapha, D.R. Paskvan, T. Reid, D.L. Schrage, S.I. Sharamentov, K.W. Shepard, G.P. Zinkann
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics and Nuclear Physics, under Contract DE-AC02-76CH03000, DE-AC02-06CH11357 and ANL WFO 85Y47.
The accelerator development group in ANL’s Physics Division has engaged in substantial R&D related to CW proton and ion accelerators. Particularly, a 4 meter long 60.625 MHz CW RFQ has been developed, built and is being commissioned with beam. Development and fabrication of a cryomodule with seven 72.75 MHz quarter-wave cavities is complete and it is being assembled. Off-line testing of several QWRs has demonstrated outstanding performance in terms of both accelerating voltage and surface resistance. Both the RFQ and cryomodule were developed and built to upgrade ATLAS to higher efficiency and beam intensities. Another cryomodule with eight 162.5 MHz SC HWRs and eight SC solenoids is being developed and built for Project X at FNAL. We are also developing both an RFQ and cryomodules (housing 176 MHz HWRs) for proton & deuteron acceleration at SNRC (Soreq, Israel). In this paper we discuss ANL-developed technologies for normal-conducting and SC accelerating structures for medium- and high-power CW accelerators, including the projects mentioned above and other developments for applications such as transmutation of spent reactor fuel. 		 
slides icon Slides TUPLB08 [1.414 MB]  
 
TUPB029 Beam Intensity and Energy Control for the SPIRAL2 Facility pick-up, controls, linac, ion 537
 
  • C. Jamet, T.A. André, C. Doutresssoulles, B. Ducoudret, W. Le Coz, G. Ledu, S.L. Leloir, S. Loret
    GANIL, Caen, France
  
  The first part of the SPIRAL2 facility, which entered last year in the construction phase at GANIL in France, consists of an ion source, a deuteron and a proton source, a RFQ and a superconducting linear accelerator delivering high intensity, up to 5mA and 40 MeV for the deuteron beams. Diagnostic developments have been done to control the intensity and the beam energy by non-interceptive methods at the linac exit. The beam current is measured by using couples of ACCT-DCCT installed along the lines and the beam energy by using a time of flight device. This paper gives explanations about the technical solutions, the results and resolutions for measuring and controlling the beam.  
 
TUPB032 Beam Dynamics of the Linac ALPI-PIAVE in View of Possible Upgrades Scenario for the SPES Project. linac, emittance, ion, injection 546
 
  • M. Comunian, C. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  • B.B. Chalykh
    ITEP, Moscow, Russia
  
  At the Legnaro National Laboratories it is operating a Super Conducting linac for nuclear studies named ALPI. The ALPI linac is injected either by a XTU tandem, up to 14 MV, or by the s-c PIAVE injector, made with 2 SC-RFQ. In this article will be report the beam dynamics simulations for some possible scenario upgrade of the linac operate by a new injector, made with a new RFQ.  
 
TUPB034 A Helium Injector for Coupled RFQ and SFRFQ Cavity Project at Peking University ion, ion-source, solenoid, extraction 552
 
  • S.X. Peng, J. Chen, J.E. Chen, S.L. Gao, Z.Y. Guo, P.N. Lu, H.T. Ren, Z. Wang, Y. Xu, J. Zhao
    PKU/IHIP, Beijing, People's Republic of China
  
  A new acceleration structure named as coupled RFQ and SFRFQ cavity is under design at Peking University (PKU). A pulsed He+ beam injector will be needed to transport 30 keV 20 mA He+ beam with a factor of 1/6, pulse width of 1 ms and normalized rms emittance less than 0.15 π{·}mm{·}mrad for this composited type cavity. Based on the experimental results obtained on the PKU LEBT test bench, a 1.16 m long two-solenoid type low energy beam transport (LEBT) line was developed. In this paper we will address the 30 keV He+ ion beam transportation experiment results on the test bench as well as the specific design on the helium injector.  
 
TUPB035 A New Design of the RFQ Channel for GSI HITRAP Facility simulation, ion, DTL, linac 555
 
  • S.G. Yaramyshev, W.A. Barth, G. Clemente, L.A. Dahl, V. Gettmann, F. Herfurth, M. Kaiser, M.T. Maier, D. Neidherr, A. Orzhekhovskaya, H. Vormann, G. Vorobjev
    GSI, Darmstadt, Germany
  • R. Repnow
    MPI-K, Heidelberg, Germany
  
  The HITRAP linac at GSI is designed to decelerate ions with mass to charge ratio of A/Z<3 from 4 MeV/u to 6 keV/u for experiments with ion traps. The particles are decelerated to 500 keV/u with an IH-DTL stucture and finally to 6 keV/u with a 4-rod RFQ. During commissioning stage the deceleration to approx. 500 keV/u was successfully demonstrated, while no particles behind the RFQ with an energy of 6 keV/u were observed. Dedicated simulations with DYNAMION code, based on 3D-fotometrie of the fabricated RFQ electrodes were successfully performed comprehending the commissioning results. In a second step the simulations have been experimentally confirmed at a test-stand (MPI, Heidelberg). An input energy, accepted by the RFQ channel is significantly higher than design value. For this reason the longitudinal beam emittance after deceleration with IH structure does not fit to the longitudinal RFQ acceptance. To solve this problem a new design of the RFQ channel with a correct input energy has been started. New RFQ parameters and the results of the beam dynamics simulations are presented in this paper.  
 
TUPB042 Progress on RFQIII Fabrication in J-PARC Linac linac, vacuum, cavity, alignment 570
 
  • T. Morishita
    JAEA/LINAC, Ibaraki-ken, Japan
  • K. Hasegawa, Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • H. Kawamata, F. Naito, T. Sugimura
    KEK, Ibaraki, Japan
  
  The J-PARC accelerator comprises an injector linac, a 3 GeV Rapid-Cycling Synchrotron and a 50 GeV Main Ring. The J-PARC linac has been operating for users with the beam energy of 181 MeV. The energy (to 400 MeV) and current (to 50 mA) upgrade of the linac is scheduled for 1MW operation at RCS. For the current upgrade, the fabrication of a new RFQ, which is designed for 50 mA acceleration, has been started. The engineering design and the fabrication technologies were carefully chosen to reduce the discharge risk during the operation. For good vacuum pumping, vanes and ports are brazed for the direct pumping through slits at the tuners. Also, we tried a chemical polishing to improve the smoothness of the vane surface. In this paper, we present the fabrication progress of a new RFQ in J-PARC linac.  
 
TUPB044 Cryogenic System for the ADS Injector II in IMP, CAS cryogenics, cryomodule, solenoid, controls 576
 
  • X.H. Guo, Y.N. Han, T. Jin, X.F. Niu, H.L. Su, J.H. Zhang
    IMP, Lanzhou, People's Republic of China
  • L.Q. Liu, N. Peng, L.-Y. Xiong
    TIPC, BeiJing, People's Republic of China
  
  Funding: Work supported by Accelerator Driven Sub-critical (ADS) program of CAS, China
In order to meet the requirements of ADS Injector II project which is now being designed and built in IMP, CAS, a liquid helium cryogenic system with 4.5K & 850W cooling power is being built. This paper presents the primary design and the status of this cryogenic system with different operation models according to the need of superconducting tests.
guoxh@impcas.ac.cn 		 
 
TUPB046 R&D Towards CW Ion Linacs at ANL cryomodule, cavity, ion, acceleration 579
 
  • P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.V. Kutsaev, J.W. Morgan, R.C. Murphy, B. Mustapha, D.R. Paskvan, T. Reid, D.L. Schrage, S.I. Sharamentov, K.W. Shepard, G.P. Zinkann
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics and Nuclear Physics, under Contract DE-AC02-76CH03000, DE-AC02-06CH11357 and ANL WFO 85Y47.
The accelerator development group in ANL’s Physics Division has engaged in substantial R&D related to CW proton and ion accelerators. Particularly, a 4 meter long 60.625 MHz CW RFQ has been developed, built and is being commissioned with beam. Development and fabrication of a cryomodule with seven 72.75 MHz quarter-wave cavities is complete and it is being assembled. Off-line testing of several QWRs has demonstrated outstanding performance in terms of both accelerating voltage and surface resistance. Both the RFQ and cryomodule were developed and built to upgrade ATLAS to higher efficiency and beam intensities. Another cryomodule with eight 162.5 MHz SC HWRs and eight SC solenoids is being developed and built for Project X at FNAL. We are also developing both an RFQ and cryomodules (housing 176 MHz HWRs) for proton & deuteron acceleration at SNRC (Soreq, Israel). In this paper we discuss ANL-developed technologies for normal-conducting and SC accelerating structures for medium- and high-power CW accelerators, including the projects mentioned above and other developments for applications such as transmutation of spent reactor fuel. 		 
 
TUPB075 Beam Dynamics Design of China ADS Proton Linac linac, cavity, emittance, proton 648
 
  • Z. Li, P. Cheng, H. Geng, Z. Guo, C. Meng, B. Sun, J.Y. Tang, F. Yan
    IHEP, Beijing, People's Republic of China
  
  Funding: Supported by China ADS Program(XDA03020000), National Natural Science Fundation of China (10875099) and IHEP Special Fundings(Y0515550U1)
It is widely accepted that the Accelerator Driven System (ADS) is one of the most promising technical approach to solve the problem of the nuclear wastes, a potential threaten to the sustainable development of the nuclear fission energy. An ADS study program is approved by Chinese Academy of Sciences at 2011, which aims to design and built an ADS demonstration facility with the capability of more than 1000 MW thermal power within the following 25 years. The 15 MW driver accelerator will be designed and constructed by the Institute of High Energy Physics(IHEP) and Institute of Modern Physics(IMP) of China Academy of Sciences. This linac is characterized by the 1.5 GeV energy, 10mA current and CW operation. It is composed by two parallel 10 MeV injectors and a main linac integrated with fault tolerance design. The superconducting acceleration structures are employed except the RFQ. In this paper the general considerations and the beam dynamics design of the driver accelerator will be presented. 		 
 
TUPB094 High Power Tests of TRASCO RFQ Couplers vacuum, cavity, simulation, klystron 681
 
  • E. Fagotti, L. Antoniazzi, F. Grespan, A. Palmieri, F. Scarpa
    INFN/LNL, Legnaro (PD), Italy
  • O. Brunasso Cattarello, R. Panero
    INFN-Torino, Torino, Italy
  • M. Desmons
    CEA/DSM/IRFU, France
  
  The 352.2 MHz 7.13 m long TRASCO RFQ requires an overall amount of 900 kW CW RF power in order to deliver the 40 mA proton beam from the initial energy of 80 keV to the final energy of 5 MeV. For such a purpose a system of eight compact (ϕext=38 mm, ϕint=19.4 mm) loop-based couplers was designed. In a first phase, only the first two (out of six) modules of the RFQ were tested at full power. Therefore only two (out of eight) couplers were used. In order to completely characterize these couplers, a dedicated test bench was prepared, consisting of a bridge waveguide and diagnostics (reflected power, vacuum, arc detectors etc.), onto which a couple of couplers was connected for transmission measurements. Each coupler was tested with a forward power of up to 140 kW. The description of the experimental setup and procedure, as well as the main results of the conditioning procedure will be reported in this paper.  
 
TH1A04 Superconducting Linac and Associated Developments at IUAC Delhi linac, ion, ECR, cavity 763
 
  • A. Roy
    IUAC, New Delhi, India
  
  A superconducting linear accelerator system consisting of a series of independently phase locked niobium quarter wave resonators has been developed as a booster of heavy ion beams available from the existing 15UD Pelletron accelerator. Two superconducting linac booster modules having eight niobium quarter wave resonators (QWRs) each have been installed and are fully operational for regular scheduled experiments. The third module is being added to the system. A new high current injector has been planned to couple to the superconducting linac. For this a high temperature superconducting electron cyclotron resonance ion source (HTS-ECRIS) was designed, fabricated and installed successfully. A radio frequency quadrupole (RFQ) accelerator is being developed for accelerating accelerate ions from the ECR (A/Q ~ 6) to an energy to of about 180 keV/A. The beams will then be accelerated further by drift tube linacs (DTL) to the required velocity to inject them to the existing superconducting linac booster. Prototypes of both these have been tested for power and thermal studies. Details of these developments and associated systems will be presented.  
slides icon Slides TH1A04 [7.830 MB]  
 
TH2A02 SPIRAL2 Accelerator Construction Progress linac, ion, ECR, cryomodule 773
 
  • P. Bertrand, R. Ferdinand
    GANIL, Caen, France
  
  The SPIRAL2 superconducting accelerator installation starts in 2012. The major components have been tested in the various partner laboratories, and the building construction is well engaged. The management of the interfaces between process and buildings is a strategic point in an underground project with strong space constraints. This contribution will describe the performances of the various components of the SPIRAL2 accelerator, and the methodology put in place in order to insure the integration of the process inside the buildings.  
slides icon Slides TH2A02 [5.441 MB]  
 
TH2A03 Design and Construction of the Linac4 Accelerating Structures linac, DTL, cavity, vacuum 778
 
  • F. Gerigk, Y. Cuvet, A. Dallocchio, G. Favre, J.-M. Geisser, L. Gentini, J.-M. Giguet, S.J. Mathot, M. Polini, S. Ramberger, B. Riffaud, C. Rossi, P. Ugena Tirado, M. Vretenar, R. Wegner
    CERN, Geneva, Switzerland
  • E. Kendjebulatov, Ya.G. Kruchkov, A.G. Tribendis
    BINP SB RAS, Novosibirsk, Russia
  • M.Y. Naumenko
    RFNC-VNIITF, Snezhinsk, Chelyabinsk region, Russia
  
  The Linac4 project at CERN is at an advanced state of construction. Prototypes of the different types of accelerating structures (RFQ, DTL, CCDTL and pi-mode structures) have been built and are presently tested. This paper gives the status of the cavity production and reviews the RF and mechanical design of the various structure types. Furthermore the production and the first test results shall be presented.  
slides icon Slides TH2A03 [2.675 MB]  
 
THPLB01 Linac Construction for China Spallation Neutron Source linac, DTL, neutron, cavity 807
 
  • S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin
    IHEP, Beijing, People's Republic of China
  
  Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H− linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.  
slides icon Slides THPLB01 [1.969 MB]  
 
THPLB02 Performance of Ferrite Vector Modulators in the LLRF system of the Fermilab HINS 6-Cavity Test cavity, controls, klystron, LLRF 810
 
  • P. Varghese, B.W. Barnes, B. Chase, E. Cullerton, C.C. Tan
    Fermilab, Batavia, USA
  
  The High Intensity Neutrino Source (HINS) 6-cavity test is a part of the Fermilab HINS Linac R&D program for a low energy, high intensity proton/H− linear accelerator. One of the objectives of the 6-cavity test is to demonstrate the use of high power RF Ferrite Vector Modulators(FVM) for independent control of multiple cavities driven by a single klystron. The beamline includes an RFQ and six cavities. The LLRF system provides a primary feedback loop around the RFQ and the distribution of the regulated klystron output is controlled by secondary learning feed-forward loops on the FVMs for each of the six cavities. The feed-forward loops provide pulse to pulse correction to the current waveform profiles of the FVM power supplies to compensate for beam-loading and other disturbances. The learning feed-forward loops are shown to successfully control the amplitude and phase settings for the cavities well within the 1 % and 1 degree requirements specified for the system.  
slides icon Slides THPLB02 [1.610 MB]  
 
THPLB03 Front-End Linac Design and Beam Dynamics Simulations for MYRRHA DTL, simulation, emittance, linac 813
 
  • C. Zhang, H. Klein, D. Mäder, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede, M. Vossberg
    IAP, Frankfurt am Main, Germany
  
  Funding: Funded by the European Atomic Energy Community’s (Euratom) 7th Framework Programme under Grant Agreement n°269565.
A 17MeV, 176MHz, and CW (Continuous Wave) proton linac is being developed as the front end of the driver accelerator for the MYRRHA facility in Mol, Belgium. Based on the promising preliminary design, further simulation and optimization studies have been performed with respect to code benchmarking, RFQ simulation using realistic LEBT output distributions, and an updated CH-DTL design with more detailed inter-tank configurations. This paper summarizes the new results. 		 
slides icon Slides THPLB03 [1.292 MB]  
 
THPLB06 The New Option for a Front End of Ion Linac ion, DTL, proton, linac 822
 
  • A.D. Kovalenko
    JINR, Dubna, Moscow Region, Russia
  • A. Kolomiets
    ITEP, Moscow, Russia
  
  The standard ion linac front-end consisting of RFQ, two tanks of accelerating IH-structures, MEBTs with matching and focusing elements is modified to achieve better performances. Special vane section that provides the same beam transformation as debuncher and quadrupole triplet is added within the RFQ tank, whereas superconducting focusing elements, solenoids, for example, are used between the IH - structure tanks. Test frond end was designed to provide the output beam energy up to 4 MeV/u for the particles with charge-to-mass ratio of 0.16 < q/m ≤ 1. Results of beam dynamics simulation are presented. Possible application of the considered scheme for the NICA facility at JINR (Dubna, Russia) is discussed.  
slides icon Slides THPLB06 [0.482 MB]  
 
THPLB07 Experience with a 4-Rod CW Radio Frequency Quadrupole ion, damping, linac, resonance 825
 
  • P. Gerhard, W.A. Barth, L.A. Dahl, W. Hartmann, G. Schreiber, W. Vinzenz, H. Vormann
    GSI, Darmstadt, Germany
  
  Since 1991 the High Charge State Injector (HLI) provides heavy ion beams for the linear accelerator UNILAC at GSI*. It is equipped with an ECR ion source and an RFQ-IH linac which accelerates highly charged ion beams with high duty factor of up to 30% to 1.4 MeV/u for further acceleration in the Alvarez DTL of the UNILAC. Main user of these beams is the Super Heavy Element (SHE) research, one of the outstanding projects at GSI**. Experiments like TASCA and SHIP strongly benefit from the high average beam intensities. After two decades of successful operation the four-rod Radio Frequency Quadrupole (RFQ) accelerator was replaced in 2010 by a newly designed RFQ of the same type**. Besides higher beam transmission, the principal intention of this upgrade was to raise the duty factor up to 100%, since the HLI is foreseen as injector for the upcoming cw linac dedicated to the SHE program**. Commissioning and operational experience from the first years revealed that this goal could not be reached easily. In this paper we present the RFQ design, commissioning results, operational experience and future activities.
* N. Angert et al., EPAC92, Berlin, Germany (1992), p. 167
** L. Dahl et al., LINAC10, Tsukuba, Japan (2010), MOP042, and references therein
 		 
slides icon Slides THPLB07 [0.986 MB]  
 
THPLB08 High-Power RF Conditioning of the TRASCO RFQ cavity, controls, vacuum, pick-up 828
 
  • E. Fagotti, L. Antoniazzi, F. Grespan, A. Palmieri
    INFN/LNL, Legnaro (PD), Italy
  • M. Desmons
    CEA/DSM/IRFU, France
  
  The TRASCO RFQ is designed to accelerate a 40 mA proton beam up to 5 MeV. It is a CW machine which has to show stable operation and provide the requested availability. It is composed of three electromagnetic segment coupled via two coupling cells. Each segment is divided into two 1.2 m long OFE copper modules. The RFQ is fed through eight loop-based power couplers to deliver RF to the cavity from a 352.2 MHZ, 1.3 MW klystron. After couplers conditioning, the first electromagnetic segment was successfully tested at full power. RFQ cavity reached the nominal 68 kV inter-vane voltage (1.8 Kilp.) in CW operation. Moreover, during conditioning in pulsed operation, it was possible to reach 83 kV inter-vane voltage (2.2 Kilp.) with a 1% duty cycle. The description of the experimental setup and procedure, as well as the main results of the conditioning procedure will be reported in this paper.  
slides icon Slides THPLB08 [1.384 MB]  
 
THPB004 Current Status of the RAL Front End Test Stand (FETS) Project ion, ion-source, simulation, diagnostics 846
 
  • D.C. Plostinar, C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • S.M.H. Alsari, M. Aslaninejad, A. Kurup, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • J.J. Back
    University of Warwick, Coventry, United Kingdom
  • G.E. Boorman, A. Bosco
    Royal Holloway, University of London, Surrey, United Kingdom
  • M.A. Clarke-Gayther, D.C. Faircloth, S.R. Lawrie, A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • S. Jolly
    UCL, London, United Kingdom
  
  The UK proton accelerator strategy aims to develop a viable high power proton driver with applications including spallation neutrons, the neutrino factory and ADSR. An essential first ingredient, identified as one of the main UK R&D accelerator projects, is the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL), aimed at producing a high quality, high current, cleanly chopped H− beam. Through its component parts, FETS has triggered development of a high brightness, 60 mA H− ion source, a three-solenoid Low Energy Beam Transport line (LEBT), a 3 MeV four-vane Radio-Frequency Quadrupole (RFQ) and a Medium Energy Beam Transport line (MEBT) with a high speed chopper. The project is well advanced and when operational should be sufficiently versatile to explore a range of operating conditions. In this paper we present the current status of the construction, and plans for operation, experiments and future development.  
 
THPB005 Front-End Linac Design and Beam Dynamics Simulations for MYRRHA DTL, simulation, emittance, linac 849
 
  • C. Zhang, H. Klein, D. Mäder, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede, M. Vossberg
    IAP, Frankfurt am Main, Germany
  
  Funding: Funded by the European Atomic Energy Community’s (Euratom) 7th Framework Programme under Grant Agreement n°269565.
A 17MeV, 176MHz, and CW (Continuous Wave) proton linac is being developed as the front end of the driver accelerator for the MYRRHA facility in Mol, Belgium. Based on the promising preliminary design, further simulation and optimization studies have been performed with respect to code benchmarking, RFQ simulation using realistic LEBT output distributions, and an updated CH-DTL design with more detailed inter-tank configurations. This paper summarizes the new results. 		 
 
THPB007 A Pulsed Linac Front-end for ADS Applications proton, emittance, simulation, linac 855
 
  • U. Ratzinger, H. Podlech, A. Schempp, K. Volk
    IAP, Frankfurt am Main, Germany
  • U. Hagen, O. Heid, T.J.S. Hughes
    Siemens AG, Erlangen, Germany
  • H. Hoeltermann
    BEVATECH OHG, Offenbach/Main, Germany
  
  Quite a number of projects worldwide develop proton driver linacs for neutron sources and other accelerator driven systems. One trend is to use a high duty factor and superconducting cavities as much as possible. Alternatively, one can aim on short duty factor and count on a continuing rapid development of pulsed rf amplifiers based on power transistor technology. A 500 mA, 5 % duty factor layout of a proton injector is presented, consisting of a filament driven volume ion source, of a 150 keV transport section and of a 4 m long 162 MHz RFQ up to 2 MeV beam energy. Beam dynamics results as well as the technical design will be shown.  
 
THPB008 A Coupled RFQ-IH Cavity for the Neutron Source FRANZ cavity, DTL, coupling, simulation 858
 
  • M. Heilmann, O. Meusel, D. Mäder, U. Ratzinger, A. Schempp, M. Schwarz
    IAP, Frankfurt am Main, Germany
  
  The Frankfurt neutron source FRANZ will deliver neutrons in the energy range from 1 to 500 keV with high pulsed intensities. A 2 MeV proton beam will produce protons via the 7Li(p,n)7Be reaction. The 175 MHz accelerator cavity consists of a 4-rod-RFQ coupled with an 8 gap interdigital H-type drift tube section, the total cavity length being 2.3m. The combined cavity will be powered by one RF amplifier to reduce investment and operation costs. The inductive power coupler will be at the RFQ part. The coupling into the IH - section is provided through a large aperture - mainly inductively. By CST - MWS - simulations as well as by an RF - model the voltage tuning along the cavity was investigated, and with special care the balance between both cavity sections. A first set of RFQ electrodes should allow to reach beam currents up to 50 mA in cw operation: The beam is pulsed with 100 ns, 250 kHz, while the cavity has to be operated cw due to the high rep. rate. The layout of the cavity cooling aims on a maximum accessible heat load of 200 kW.  
 
THPB009 Status of CH Cavity and Solenoid Design of the 17 MeV Injector for MYRRHA solenoid, cavity, focusing, quadrupole 861
 
  • D. Mäder, H. Klein, H. Podlech, U. Ratzinger, C. Zhang
    IAP, Frankfurt am Main, Germany
  
  Funding: This work has been supported by the EU (FP7 MAX contract number 269565)
The multifunctional subcritical reactor MYRRHA (Multi-purpose hybrid research reactor for high-tech applications) will be an accelerator driven system (ADS) located in Mol (Belgium). The first accelerating section up to 17 MeV is operated at 176 MHz and consists of a 4-rod-RFQ followed by two room temperature CH cavities with integrated triplet lenses and four superconducting CH structures with intertank solenoids. Each room temperature CH cavity provides about 1 MV effective voltage gain using less than 30 kW of RF power. The superconducting resonators have been optimized for electric peak fields below 30 MV/m and magnetic peak fields below 30 mT. For save operation of the superconducting resonators the magnetic field of the intertank solenoids has to be well shielded towards the CH cavity walls. Different coil geometries have been compared to find the ideal solenoid layout. 		 
 
THPB010 Progress in the Construction of Linac4 at CERN linac, injection, klystron, DTL 864
 
  • M. Vretenar, L. Arnaudon, P. Baudrenghien, G. Bellodi, C. Bertone, Y. Body, J.C. Broere, O. Brunner, M.C.L. Buzio, C. Carli, J.-P. Corso, J. Coupard, A. Dallocchio, N. Dos Santos, J.-F. Fuchs, A. Funken, R. Garoby, F. Gerigk, L. Hammouti, K. Hanke, J. Hansen, I. Kozsar, J.-B. Lallement, J. Lettry, A.M. Lombardi, L.A. Lopez Hernandez, C. Maglioni, S.J. Mathot, B. Mikulec, D. Nisbet, M.M. Paoluzzi, B. Puccio, U. Raich, S. Ramberger, F. Roncarolo, C. Rossi, N. Schwerg, R. Scrivens, G. Vandoni, J. Vollaire, R. Wegner, S. Weisz, Th. Zickler
    CERN, Geneva, Switzerland
  
  As first step of the LHC luminosity upgrade program CERN is building a new 160 MeV H¯ linear accelerator, Linac4, to replace the ageing 50 MeV Linac2 as injector to the PS Booster (PSB). Linac4 is an 86-m long normal-conducting linac made of a 3 MeV injector followed by 22 accelerating cavities of three different types. The general service infrastructure has been installed in the new tunnel and surface building and its commissioning is progressing; high power RF equipment is being installed in the hall and installations in the tunnel will start soon. Construction of the accelerator parts is in full swing involving industry, the CERN workshops and a network of international collaborations. The injector section including a newly designed and built H¯ source, a 3-m long RFQ and a chopping line is being commissioned in a dedicated test stand. Beam commissioning of the linac will take place in steps of increasing energy between 2013 and 2014. From end of 2014 Linac4 could deliver 50 MeV protons in case of Linac2 failure, while 160 MeV H¯ could be injected into the PSB from end of 2015; the exact start of the LHC shut-down required for connection will be coordinated with its experiments.  
 
THPB011 Linac4 45 keV Proton Beam Measurements solenoid, linac, simulation, proton 867
 
  • G. Bellodi, V.A. Dimov, L.M. Hein, J.-B. Lallement, A.M. Lombardi, O. Midttun, R. Scrivens
    CERN, Geneva, Switzerland
  • P.A. Posocco
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  Linac4 is a 160 MeV normal-conducting H− linear accelerator, which will replace the 50 MeV proton Linac (Linac2) as injector for the CERN proton complex. Commissioning of the low energy part - H− source, a 45 keV Low Energy Beam Transport line (LEBT), a 3 MeV RFQ and a Medium Energy Beam Transport (MEBT) line - will start in fall 2012 on a dedicated test stand installation. In preparation to this, preliminary measurements were taken in the past few months using a 45 keV proton source and a temporary LEBT setup, with the aim of characterising the output beam by comparison with simulations. This also allowed a first verification of the diagnostics instrumentation and acquisition software tools. Measurements of beam profile, emittance and intensity were taken after the source, after the first and after the second LEBT solenoids respectively. Particle distributions were reconstructed from emittance scans and used as input to simulation studies of the beam transport through the line. Comparison of the results with the measurements allowed an experimental validation of the LEBT (in terms of misalignments and calibration points) and qualification of the beam at the source output.  
 
THPB014 Lattice Design and Beam Dynamics Studies for Project X linac, cryomodule, lattice, emittance 876
 
  • N. Solyak, J.-P. Carneiro, V.A. Lebedev, J.-F. Ostiguy, A. Saini
    Fermilab, Batavia, USA
  
  Fermilab is developing Project-X, a high intensity superconducting H− machine for high energy physics experiments. The first stage is 1 mA average, 3 GeV linac operating in CW mode. Its front-end comprises a LEBT section with magnetic focusing and pre-chopping, a 162.5 MHz RFQ and ~10 m long MEBT section which includes a high bandwidth, bunch-by-bunch capable chopper. The latter extracts, out of a nominal 5 mA peak 162.5 MHz train, and arbitrary bunch structure able to meet the requirements of different experiments. Acceleration from 2.1 MeV to 3 GeV is accomplished through five families of SRF cavities operating at three frequencies: Half-wave resonators (162.5 MHz), spoke cavities (two families at 325 MHz) and elliptical cavities (two families at 650 MHz). In this contribution, we present the status of the CW linac lattice design and results from recent beam physics studies.  
 
THPB015 Performance of Ferrite Vector Modulators in the LLRF system of the Fermilab HINS 6-Cavity Test cavity, controls, klystron, LLRF 879
 
  • P. Varghese, B.W. Barnes, B. Chase, E. Cullerton, C.C. Tan
    Fermilab, Batavia, USA
  
  The High Intensity Neutrino Source (HINS) 6-cavity test is a part of the Fermilab HINS Linac R&D program for a low energy, high intensity proton/H− linear accelerator. One of the objectives of the 6-cavity test is to demonstrate the use of high power RF Ferrite Vector Modulators(FVM) for independent control of multiple cavities driven by a single klystron. The beamline includes an RFQ and six cavities. The LLRF system provides a primary feedback loop around the RFQ and the distribution of the regulated klystron output is controlled by secondary learning feed-forward loops on the FVMs for each of the six cavities. The feed-forward loops provide pulse to pulse correction to the current waveform profiles of the FVM power supplies to compensate for beam-loading and other disturbances. The learning feed-forward loops are shown to successfully control the amplitude and phase settings for the cavities well within the 1 % and 1 degree requirements specified for the system.  
 
THPB017 A Concept: 8GeV CW Linac, Staged Approach linac, booster, injection, proton 885
 
  • M. Popovic, J.-F. Ostiguy
    Fermilab, Batavia, USA
  
  This note describes a concept of CW Proton Linac on the Fermilab site. With exception of RFQ the linac is based on superconducting technology. Based on the output, energy is segmented in three parts, 1GeV, 3GeV and 8GeV. It is located near existing Fermilab Proton Source with the intention that each section of the linac can be used as soon as it is commissioned. The whole design is based on the designs suggested for the Proton Driver and ProjectX. The suggested site and linac segmentation allows for the construction to start immediately. Additional benefits come from the fact that the present linac (the oldest machine in Fermilab complex) is replaced and existing Proton Source’s functionality is preserved for the future.  
 
THPB023 Linac Construction for China Spallation Neutron Source linac, DTL, neutron, cavity 897
 
  • S. Fu, J. Li, H.C. Liu, H.F. Ouyang, X. Yin
    IHEP, Beijing, People's Republic of China
  
  Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accelerator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H− linac and 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the front end and four DTL tanks, has finalized the design and started procurement. In this paper, we will first present an outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results of the linac will be presented. Finally the linac construction progress in recent will be updated.  
 
THPB026 The Beam Commissioning Plan of Injector II in C-ADS cavity, proton, simulation, diagnostics 906
 
  • Z.J. Wang, Y. He, H. Jia, C. Li, S.H. Liu, W. Wu, X.B. Xu, B. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  The design work of the Injector II, which is 10 MeV proton linac, in C-ADS project is being finished and some key elements are being fabricated. Now it is necessary to definite the operation mode of beam commissioning, including the selection of the beam current, pulse length and repetition frequency. Also the beam commissions plan should be specified. The beam commissions procedures is simulated with t-mode code GPT. In this paper, the general beam commissioning plan of Injector II in CIADS and simulation results of commissions procedures are presented.  
 
THPB027 Progress of one of 10 MeV superconducting proton linear Injectors for C-ADS linac, proton, cavity, niobium 909
 
  • Y. He, J. Meng, A. Shi, Z.J. Wang, J.X. Wu, W. Wu, H.S. Xu, Z. Xu, B. Zhang, J.H. Zhang, S.H. Zhang, Z.M. Zhang, H.W. Zhao, Z.Z. Zhou
    IMP, Lanzhou, People's Republic of China
  • D. Li
    LBNL, Berkeley, California, USA
  
  A 10 MeV superconducting proton linac is being design and constructing at Institute of Modern Physics (IMP) of Chinese Academy of Sciences (CAS). This proton linac is one of two injectors for Chinese ADS project. It is to validate one of concepts for C-ADS front end, to demonstrate the low beta acceleration, to minimize the risk of key technoledges within the Reference Design. It consists of a 2.1 MeV RFQ and two cryomodules hosting 8 HWR cavities. The basic frequecy is 162.5 MHz. The physical design of linac and the progess of prototypes for solid state amplifiers, superconducting solenoids, supercondecting HWRs, ion source, and RFQ are presented in the paper.  
 
THPB028 The ESS Low Energy Beam Transport Line Design solenoid, linac, ion, emittance 912
 
  • L. Neri, L. Calabretta, A.C. Caruso, L. Celona, S. Gammino, A. Longhitano, D. Mascali
    INFN/LNS, Catania, Italy
  • B. Cheymol, A. Ponton
    ESS, Lund, Sweden
  
  The linear accelerator of the European Spallation Source (ESS) will deliver proton beams of 50 mA and 2.5 GeV onto the 5 MW neutron production target. The Proton Source for ESS (PS-ESS) [1] is based on the experience of TRIPS and VIS developed at LNS Catania [2,3]. A two solenoid Low Energy Beam Transport (LEBT) is foreseen to match the beam into the first acceleration stage, the Radio-Frequency Quadrupole (RFQ) [4]. Beam production means also detailed characterization of produced beam, with this scope the LEBT houses many instrumentation devices and use different techniques that will be described in this work. The LEBT will be also equipped with an electrostatic chopper in order to remove the unwanted part of the beam pulse during the natural rise and fall times of the ion source. Beam dynamics calculations of the LEBT have been carried out considering also the Space Charge Compensation (SCC) produced by the interaction of the beam with the residual gas, and its effect on beam transport and chopping. Particular emphasis has been put on the evaluation of the beam transient behavior, due to the chopping process, at the entrance of the RFQ, results of the study are presented in this paper.  
 
THPB029 The ESS RFQ Beam Dynamics Design linac, proton, emittance, DTL 915
 
  • A. Ponton
    ESS, Lund, Sweden
  
  to be added  
 
THPB031 Status Report on the French High-intensity Proton Injector Project at SACLAY (IPHI) dipole, coupling, quadrupole, diagnostics 921
 
  • B. Pottin, M. Desmons, A. France, R. Gobin, O. Piquet
    CEA/DSM/IRFU, France
  
  The construction of IPHI (High Power Proton Accelerator) is in its final step of installation. The high intensity light ion source (SILHI) has been built first to produce regularly CW high intensity (over 100 mA) proton beams. The low energy front end of IPHI is based on a 352 MHz, 6 m long Radiofrequency Quadrupole (RFQ) cavity. The RFQ will accelerate beam up to 100 mA with energy up to 3 MeV. A diagnostics line has been designed to measure all the main characteristics of the beam at the RFQ output. In this paper we will present the status for the main components of the injector, in particularly the RFQ fabrication and the RF power facilities.  
 
THPB032 Beam Dynamics Design Aspects for a Proposed 800 MeV H− ISIS Linac linac, cavity, DTL, quadrupole 924
 
  • D.C. Plostinar, C.R. Prior, G.H. Rees
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  Several schemes have been proposed to upgrade the ISIS Spallation Neutron Source at Rutherford Appleton Laboratory (RAL). One scenario is to develop a new 800 MeV, H− linac and a ~3 GeV synchrotron, opening the possibility of achieving several MW of beam power. In this paper the design of the 800 MeV linac is outlined with an emphasis on the beam dynamics design philosophy. The linac consists of a 3 MeV Front End similar to the one now under construction at RAL (the Front End Test Stand -FETS). Above 3 MeV, a 324 MHz DTL will be used to accelerate the beam up to ~75 MeV. At this stage a novel collimation system will be added to remove the halo and the far off-momentum particles. To achieve the final energy, a 648 MHz superconducting linac will be employed using three families of elliptical cavities with transition energies at ~196 MeV and ~412 MeV.  
 
THPB034 Status of the FAIR 70 MeV Proton Linac proton, linac, cavity, DTL 927
 
  • L. Groening, W.A. Barth, R. Berezov, G. Clemente, P. Forck, R. Hollinger, A. Krämer, C. Mühle, J. Pfister, G. Schreiber, J. Trüller, W. Vinzenz, C. Will
    GSI, Darmstadt, Germany
  • N. Chauvin, O. Delferrière, O. Tuske
    CEA/IRFU, Gif-sur-Yvette, France
  • B. Koubek, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede
    IAP, Frankfurt am Main, Germany
  • B. Launé, J. Lesrel
    IPN, Orsay, France
  • C.S. Simon
    CEA/DSM/IRFU, France
  
  To provide the primary proton beam for the FAIR anti-proton research program, a 70 MeV, 70 mA linac is currently under design & construction at GSI. The nc machine comprises an ECR source, a 3 MeV RFQ, and a DTL based on CH-cavities. Up to 36 MeV pairs of rf-coupled cavities (CCH) are used. A prototype cavity has been built and is prepared for high power rf-testing. An overview of the status as well as on the perspectives of the project is given.  
 
THPB035 Experience with a 4-Rod CW Radio Frequency Quadrupole ion, damping, linac, resonance 930
 
  • P. Gerhard, W.A. Barth, L.A. Dahl, W. Hartmann, G. Schreiber, W. Vinzenz, H. Vormann
    GSI, Darmstadt, Germany
  
  Since 1991 the High Charge State Injector (HLI) provides heavy ion beams for the linear accelerator UNILAC at GSI*. It is equipped with an ECR ion source and an RFQ-IH linac which accelerates highly charged ion beams with high duty factor of up to 30% to 1.4 MeV/u for further acceleration in the Alvarez DTL of the UNILAC. Main user of these beams is the Super Heavy Element (SHE) research, one of the outstanding projects at GSI**. Experiments like TASCA and SHIP strongly benefit from the high average beam intensities. After two decades of successful operation the four-rod Radio Frequency Quadrupole (RFQ) accelerator was replaced in 2010 by a newly designed RFQ of the same type**. Besides higher beam transmission, the principal intention of this upgrade was to raise the duty factor up to 100%, since the HLI is foreseen as injector for the upcoming cw linac dedicated to the SHE program**. Commissioning and operational experience from the first years revealed that this goal could not be reached easily. In this paper we present the RFQ design, commissioning results, operational experience and future activities.
* N. Angert et al., EPAC92, Berlin, Germany (1992), p. 167
** L. Dahl et al., LINAC10, Tsukuba, Japan (2010), MOP042, and references therein
 		 
 
THPB036 The New Option for a Front End of Ion Linac ion, DTL, proton, linac 933
 
  • A.D. Kovalenko
    JINR, Dubna, Moscow Region, Russia
  • A. Kolomiets
    ITEP, Moscow, Russia
  
  The standard ion linac front-end consisting of RFQ, two tanks of accelerating IH-structures, MEBTs with matching and focusing elements is modified to achieve better performances. Special vane section that provides the same beam transformation as debuncher and quadrupole triplet is added within the RFQ tank, whereas superconducting focusing elements, solenoids, for example, are used between the IH - structure tanks. Test frond end was designed to provide the output beam energy up to 4 MeV/u for the particles with charge-to-mass ratio of 0.16 < q/m ≤ 1. Results of beam dynamics simulation are presented. Possible application of the considered scheme for the NICA facility at JINR (Dubna, Russia) is discussed.  
 
THPB037 Iron Beam Acceleration with DPIS plasma, injection, ion, laser 936
 
  • M. Okamura
    BNL, Upton, Long Island, New York, USA
  • P.J. Jandovitz
    Cornell University, Ithaca, New York, USA
  • T. Kanesue
    IAP, Frankfurt am Main, Germany
  • M. Sekine
    RLNR, Tokyo, Japan
  • T. Yamamoto
    RISE, Tokyo, Japan
  
  Funding: The work supported by US. DOE and RIKEN Japan.
It has been proved that direct plasma Injection Scheme (DPIS) is an efficient way to accelerate high current highly charged state heavy ion beam. More than 50 mA (peak current) of various heavy ion beams can be easily accelerated. However, it was rather difficult to obtain longer pulse especially for highly charged particles. To induce highly charged states ions, a high plasma temperature is required at the laser irradiation point and the high temperature automatically gives a very fast expansion velocity of the plasma. This shortens the ion beam pulse length. To compensate the shorter ion pulse length, we can extend the plasma drift length, but it will dilute the brightness of the plasma since the plasma expands three dimensionally. To avoid the reduction of the brightness, a simple long solenoid was applied to confine the diverging angle of the plasma expansion. In the conference, this new technique will be explained and the latest results of iron beam acceleration will be shown. 		 
 
THPB038 Assembly and RF Tuning of the Linac4 RFQ at CERN quadrupole, dipole, linac, cavity 939
 
  • C. Rossi, A. Dallocchio, J. Hansen, J.-B. Lallement, A.M. Lombardi, S.J. Mathot, D. Pugnat, M.A. Timmins, G. Vandoni, M. Vretenar
    CERN, Geneva, Switzerland
  • M. Desmons, A. France, Y. Le Noa, J. Novo, O. Piquet
    CEA/DSM/IRFU, France
  
  The fabrication of Linac4 is progressing at CERN with the goal of making a 160 MeV H− beam available to the LHC injection chain as from 2015. In the Linac4 the first stage of beam acceleration, after its extraction from the ion source, is provided by a Radiofrequency Quadrupole accelerator (RFQ), operating at the RF frequency of 352.2 MHz and which accelerates the ion beam to the energy of 3 MeV. The RFQ, made of three modules, one meter each, is of the four-vane kind, has been designed in the frame of a collaboration between CERN and CEA and has been completely machined and assembled at CERN. The paper describes the assembly of the RFQ structure and reports the results of RF low power measurements, in order to achieve the required accelerating field flatness within 1% of the nominal field profile.  
 
THPB039 Design of a Four-Vane RFQ for China ADS Project cavity, emittance, neutron, proton 942
 
  • Z.L. Zhang, X. Du, Y. He, X. Jin, C. Li, Y. Liu, A. Shi, L.P. Sun, B. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  • M.D. Hoff, A.R. Lambert, D. Li, J.W. Staples, S.P. Virostek
    LBNL, Berkeley, California, USA
  • J. Wang
    Lanzhou University of Technology, People's Republic of China
  • C. Zhang
    IAP, Frankfurt am Main, Germany
  
  A four-vane RFQ accelerator has been designed for the ADS project which has been launched in China since 2011. As one of the front ends of C-ADS LINAC, the RFQ works at a frequency of 162.5 MHz, accelerating the proton beam from 35 keV to 2.1 MeV. Due to the CW (continuous wave) operating mode, a small Kilpatric factor of 1.2 was adopted. At the same time, Pi-mode rods are employed to reduce the effect of dipole mode on quadrupole mode, and cavity tuning will be implemented by temperature adjustment of cooling water. Beam dynamics design, RF cavity design, thermal and stress analysis all will be presented in the paper.  
 
THPB040 High-Power RF Conditioning of the TRASCO RFQ cavity, controls, vacuum, pick-up 945
 
  • E. Fagotti, L. Antoniazzi, F. Grespan, A. Palmieri
    INFN/LNL, Legnaro (PD), Italy
  • M. Desmons
    CEA/DSM/IRFU, France
  
  The TRASCO RFQ is designed to accelerate a 40 mA proton beam up to 5 MeV. It is a CW machine which has to show stable operation and provide the requested availability. It is composed of three electromagnetic segment coupled via two coupling cells. Each segment is divided into two 1.2 m long OFE copper modules. The RFQ is fed through eight loop-based power couplers to deliver RF to the cavity from a 352.2 MHZ, 1.3 MW klystron. After couplers conditioning, the first electromagnetic segment was successfully tested at full power. RFQ cavity reached the nominal 68 kV inter-vane voltage (1.8 Kilp.) in CW operation. Moreover, during conditioning in pulsed operation, it was possible to reach 83 kV inter-vane voltage (2.2 Kilp.) with a 1% duty cycle. The description of the experimental setup and procedure, as well as the main results of the conditioning procedure will be reported in this paper.  
 
THPB042 Production and Quality Control of the First Modules of the IFMIF-EVEDA RFQ cavity, survey, controls, coupling 948
 
  • F. Scantamburlo, R. Dima, A. Pepato
    INFN- Sez. di Padova, Padova, Italy
  • C. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  
  The IFMIF/EVEDA RFQ, designed to accelerate a 125mA D+ beam from 0.1 MeV to 5 MeV at a frequency of 175 MHz, consists of 18 modules with length of ~550 mm each. The production of the modules has been started and 2 prototype modules plus module 16 have undergone all the production steps, including precision milling and brazing. The progress of the construction and especially the fine tuning of the design and engineering phase are reported.  
 
THPB043 The RFQ injector for the Radioactive Ion Beam of SPES Project ion, linac, emittance, injection 951
 
  • M. Comunian, F. Grespan, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  A Continous Wave Radio Frequency Quadrupole Accelerator has been designed for the Radioactive Ion Beam of SPES Project to be used as an Injector of the ALPI Linac. The RFQ frequency is 80 MHz for an input energy of 40 keV, with output energy of 5 MeV and ion ratio q/A<= 1/7. Particular care has been put in the design phase to include an internal bunching section able to reduce the longitudinal output emittance. The details of the RF study of such a cavity are included as well.  
 
THPB044 Plans for an Integrated Front-End Test Stand at the Spallation Neutron Source klystron, ion, ion-source, controls 954
 
  • M.S. Champion, A.V. Aleksandrov, M.T. Crofford, D. Heidenreich, Y.W. Kang, J. Moss, R.T. Roseberry, J.P. Schubert
    ORNL, Oak Ridge, Tennessee, USA
  
  Funding: Work performed at Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
A spare Radio-Frequency Quadrupole (RFQ) is presently being fabricated by industry with delivery to Oak Ridge National Laboratory planned in late 2012. The establishment of a test stand at the Spallation Neutron Source site is underway so that complete acceptance testing can be performed during the winter of 2012-2013. This activity is the first step in the establishment of an integrated front-end test stand that will include an ion source, low-energy beam transport (LEBT), RFQ, medium-energy beam transport, diagnostics, and a beam dump. The test stand will be capable of delivering an H− ion beam of up to 50 mA with a pulse length of 1 ms and a repetition rate of 60 Hz or a proton beam of up to 50 mA, 100 μs, 1 Hz. The test stand will enable the following activities: complete ion source characterization; development of a magnetic LEBT chopper; development of a two-source layout; development of beam diagnostics; and study of beam dynamics of high intensity beam. 		 
 
THPB046 RF Setup of the MedAustron RFQ resonance, simulation, ion, pick-up 957
 
  • B. Koubek, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main, Germany
  • J. Haeuser
    Kress GmbH, Biebergemuend, Germany
  
  A Radio Frequency Quadrupole (RFQ) was built for the injector of the cancer treatment facility MedAuston in Austria. For the RF design simulations were performed using CST Microwave Studio and the structure was manufactured by Firma Kress in Biebergemuend, Germany. The simulations and the RF setup of the delivered RFQ are presented in this paper.  
 
THPB047 Test RFQ for the MAX Project simulation, cavity, linac, proton 960
 
  • M. Vossberg, H. Klein, H. Podlech, A. Schempp, C. Zhang
    IAP, Frankfurt am Main, Germany
  • A. Bechtold
    NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
  
  As a part of the MAX project it will be demonstrated by simulations and thermal measurements, that a 4-rod-RFQ is the right choice even at cw-operation. A 4-rod Test-RFQ with a resonance frequency of 175 MHz has been designed and built for the MAX-Project. But the RFQ had to be modified to solve the cooling problem at cw-operation, the geometrical precision had to be improved as well as the rf-contacts. The developments led to a new layout and a sophisticated production procedure of the stems and the electrodes. Calculations show an improved Rp-value leading to powerlosses of ca. 25 kW/m only, which is about half of the powerlosses which could be achieved safely at cw-operation of the similar Saraf-RFQ. Thermal measurements and simulations with the single components are in progress. The temperature distribution in cw-operation will be measured and the rf-performance checked.  
 
THPB049 Tuning Studies on 4-Rod-RFQs simulation, linac, resonance, coupling 963
 
  • J.S. Schmidt, B. Klump, B. Koubek, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  A NI LabVIEW based Tuning Software has been devel- oped to structure the tuning process of 4-rod Radio Fre- quency Quadrupole s (RFQs). Its results are compared to measurement data of 4-rod RFQs in different frequency ranges. For the optimization of RFQ design parameters, a certain voltage distribution along the electrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very important for the beam dynamic prop- erties of an RFQ. A variation can lead to particle losses and reduced beam quality especially at higher frequencies. Our electrode design usually implies a constant longitudi- nal voltage distribution. For its adjustment tuning plates are used between the stems of the 4-rod-RFQ. These pre- dictions are based, in contrast to other simulations, on mea- surements to define the characteristics of the RFQ as it was build - not depending on assumptions of the design. This will lead to a totally new structured process of tuning 4- rod-RFQs in a broad range of frequencies by using the pre- dictions of a software. The results of these studies are pre- sented in this paper.  
 
THPB050 RFQ With Improved Energy Gain simulation, acceleration, ion, emittance 966
 
  • A. Kolomiets
    ITEP, Moscow, Russia
  • A.S. Plastun
    MEPhI, Moscow, Russia
  
  RFQ structure is practically only one choice for using in front ends of ion linacs for acceleration up to energy about 3 MeV. This limit is due to its relatively low acceleration efficiency. However it isn’t intrinsic feature of RFQ principle. It is defined only by vane geometry of conventional RFQ structure with sinusoidal modulation of vanes. The paper presents results of analysis RFQ with modified vane geometries that allow to improve acceleration efficiency. RFQ with modified vanes was used for design second section of heavy ion injector of TWAC for acceleration of ions with Z/A = 0.33 up to 7 MeV/u.  
 
THPB051 Improvements at the BNL 200 MeV Linac linac, solenoid, emittance, beam-transport 969
 
  • D. Raparia, J.G. Alessi, B. Briscoe, J.M. Fite, O. Gould, V. LoDestro, M. Okamura, J. Ritter, A. Zelenski
    BNL, Upton, Long Island, New York, USA
  
  After reconfiguration of the low energy (35 keV) and the medium energy (750 keV) transport lines in 2009-10, the Brookhaven linac delivered the highest intensity beam since it was built in 1970 (~120 μA average current of H− to the Brookhaven Linac Isotope Producer). It also delivered lower emittance polarized H− ion beam for the polarized program at RHIC. To increase the intensity further, the match into the RFQ was improved by reducing the distance from the fnal focusing solenoid to the RFQ and replacing the buncher in the 750 keV line with one with higher Q value, to allow operation at higher power. We also found that drift –tube linac tank number 7 was operating with about 1 MW lower power than design. The transmission efficiencies and beam quality will be discussed in the paper.  
 
THPB052 Recent Progress with the J-PARC RFQs linac, emittance, vacuum, simulation 972
 
  • Y. Kondo, K. Hasegawa, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • H. Kawamata, F. Naito, T. Sugimura
    KEK, Ibaraki, Japan
  
  In this paper, we will report recent topics about J-PARC RFQs. First, the operating RFQ (RFQ I) have been recovered from the long shutdown due to the earthquake. This RFQ have been suffered from breakdown problem since 2008, therefore we have been developing a back-up RFQ (RFQ II). In April 2012, the high power test was successfully performed. Finally, we are fabricating a new RFQ for the beam-current upgrade of the J-PARC linac (RFQ III). The status of these RFQs are described.  
 
THPB055 Numerical Simulations of ProjectX/PXIE RFQ linac, emittance, simulation, space-charge 975
 
  • J.-F. Ostiguy, A. Saini, N. Solyak
    Fermilab, Batavia, USA
  
  Funding: Fermi Research Alliance, LLC under DOE Contract No. De-AC02-07CH11359
Project-X is a proposed superconducting linac-based high intensity proton source at Fermilab. The machine first stages operate in CW mode from 2.1 to 3 GeV and a high bandwidth chopper is used to produce the required bunch patterns. A 162.5 MHz CW RFQ accelerates the beam from 30 keV to 2.1 MeV. A concern with CW operation is that losses either within the RFQ or in the dowstream modules should be well-understood and remain very low to ensure safe and/or reliable operation. In this contribution, we investigate the suitability of existing RFQ codes and model the PXIE RFQ (ProjectX test facility) designed constructed by LBNL to make useful predictions of loss patterns and phase space distribution. 		 
 
THPB065 Status of the Beam Dynamics Code DYNAC dipole, emittance, quadrupole, simulation 990
 
  • E. Tanke, J.A. Rodriguez, W. Wittmer, X. Wu
    FRIB, East Lansing, Michigan, USA
  • S. Valero
    CEA, Gif-sur-Yvette, France
  • D. Wang
    NSCL, East Lansing, Michigan, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The beam dynamics code DYNAC* was originally developed at CERN. For accelerating elements a set of very accurate quasi-Liouvillian beam dynamics equations was introduced, applicable to protons, heavy ions and non-relativistic electrons. Furthermore, DYNAC contains three space charge routines, including a 3D version**. More recently, a numerical method has been added, capable of simulating a multi charge state ion beam in accelerating elements (i.e. cavities). Beam line devices such as sextupoles and quadrupole-sextupole magnets as well as electrostatic devices are now also included. Capability of second order calculations of such elements for a multi charge state beam has been implemented. Benchmarking of the code, in particular for a multi-charge state beam is discussed. Comparison of beam simulations results with beam measurements on the MSU ReAccelerator (ReA) are reported. The possibility of using DYNAC as an online tool for ReA and FRIB is discussed.
*DYNAC: A Multi-Particle Beam Dynamics Code for Leptons and Hadrons, E.Tanke et al,LINAC2002
**HERSC: A New 3 Dimensional Space Charge Routine for High Intensity Bunched Beams, E.Tanke et al,LINAC2002 		 
 
THPB081 The Development of Timing Control System for RFQ controls, EPICS, proton, background 1014
 
  • J.N. Bai, S. Xiao, T.G. Xu, L. Zeng
    IHEP, Beijing, People's Republic of China
  
  Timing control system based on VME configuration is developed to meet the need of 3.5 MeV RFQ. An EPICS driver is provided to control its work. The timing control system satisfies request after examination. In the future, it will be used in the machine running. This paper introduces the Timing control hardware, VME interface, EPICS driver for Timing control system and MEDM operator interface.  
 
THPB094 Performance of Beam Chopper at SARAF via RF Deflector Before the RFQ simulation, ion, proton, ion-source 1038
 
  • A. Shor, D. Berkovits, I. Fishman, A. Grin, B. Kaizer, L. Weissman
    Soreq NRC, Yavne, Israel
  
  We describe performance of a beam chopper at the SARAF accelerator consisting of an HV deflector preceding the RFQ. The deflector and electronics, developed at LNS Catania, was designed to provide slow beam chopping for beam testing and diagnostics where low beam power is necessary. The HV deflector sweeps away the low energy beam onto a water cooled beam catcher, while a fast HV switch momentarily switches off the HV whenever a transmitted beam to the RFQ is desired. We report on measurements with this chopping system, where minimum transmitted beam pulse of 180 ns duration is attained with a rise and fall time of several nano-seconds. We performed beam dynamics simulations of SARAF Phase-I, including the deflector, where the short rise and fall times of the chopped beam is attributed to the tight collimation of the deflected beam provided by the RFQ and the fast Faraday Cup. We also describe beam dynamics simulations which suggest that single RFQ bunch selection can be achieved with the existing chopping system, during zero-crossover for positive-negative deflecting HV waveform.  
 
THPB097 FRIB Front End Design Status ion, linac, ECR, ion-source 1047
 
  • E. Pozdeyev, N.K. Bultman, G. Machicoane, G. Morgan, X. Rao, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • V.L. Smirnov, S.B. Vorozhtsov
    JINR, Dubna, Moscow Region, Russia
  • J. Stovall
    CERN, Geneva, Switzerland
  • L.T. Sun
    IMP, Lanzhou, People's Republic of China
  • L.M. Young
    LANL, Los Alamos, New Mexico, USA
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) will provide a wide range of primary ion beams for nuclear physics research with rare isotope beams. The FRIB SRF linac will be capable of accelerating medium and heavy ion beams to energies beyond 200 MeV/u with a power of 400 kW on the fragmentation target. This paper presents the status of the FRIB Front End designed to produce uranium and other medium and heavy mass ion beams at world-record intensities. The paper describes the FRIB high performance superconducting ECR ion source, the beam transport designed to transport two-charge state ion beams and prepare them for the injection in to the SRF linac, and the design of a 4-vane 80.5 MHz RFQ. The paper also describes the integration of the front end with other accelerator and experimental systems. 		 
 
FR1A04 In Flight Ion Separation using a Linac Chain linac, DTL, ISAC, TRIUMF 1059
 
  • M. Marchetto, F. Ames, B. Davids, R.E. Laxdal, A.C. Morton
    TRIUMF, Vancouver, Canada
  
  The ISAC accelerator complex now can accelerate radioactive heavy ion beams to above the Coulomb Barrier. Recently an ECR type charge state booster has been added to allow the acceleration of radioactive beams with masses A>30. A characteristic of the ECR source is the efficient ionization of background species that can overwhelm the low intensity RIB beam. The long linac chain at ISAC can be used to provide some in flight separation both in time domain and in spatial domain analogous to fragment separators at in-flight fragmentation facilities. The talk will summarize the work done at TRIUMF to develop tools to aid in the filtration and diagnosis of beam purity in the post acceleration of charge bred beams. Marco Marchetto has been leading this effort.  
slides icon Slides FR1A04 [24.174 MB]  
 
FR1A05 SARAF Phase II P/D 40 MeV Linac Design Studies linac, cryomodule, proton, emittance 1064
 
  • P.N. Ostroumov, Z.A. Conway, M.P. Kelly, A. Kolomiets, S.V. Kutsaev, B. Mustapha
    ANL, Argonne, USA
  • J. Rodnizki
    Soreq NRC, Yavne, Israel
  
  Funding: This work was supported by the ANL WFO No. 85Y47
The Soreq NRC initiated the establishment of SARAF – Soreq Applied Research Accelerator Facility. SARAF will be a multi-user facility for basic research, e.g., nuclear astrophysics, radioactive beams, medical and biological research; neutron based non-destructive testing (using a thermal neutron camera and a neutron diffractometer) and radio-pharmaceuticals research, development and production. The SARAF continuous wave (CW) accelerator is planned to produce variable energy (5-40 MeV) proton and deuteron beam currents (0.04-5 mA). Phase I of SARAF (ion source, radio-frequency quadrupole (RFQ), and one cryomodule housing 6 half-wave resonators (HWR) was installed and being operated at Soreq NRC delivering CW 1mA 3.5 MeV proton beams and low-duty cycle (0.0001) 0.3 mA 4.7 MeV deuteron beams. SARAF is designed to enable hands-on maintenance, which implies very low beam losses for the entire accelerator. The physics design of two options is explored to subsequently develop a conceptual design for selected option for extending the linac to its planned beam parameters (SARAF Phase-II: 40 MeV, 5 mA protons and deuterons). 		 
slides icon Slides FR1A05 [3.459 MB]  
 
FR2A01 Recovery of the J-PARC Linac from the Earthquake linac, DTL, vacuum, ion 1069
 
  • K. Hasegawa
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  
  Following the amazingly quick recovery from the disastrous earthquake in March 2011, and in the interests of promoting robust designs of linacs, it would be interesting to learn what the J-PARC team reckons are the key features of accelerator design and construction that lead to strong and reliable hardware.  
slides icon Slides FR2A01 [3.928 MB]