Keyword: rfq
Paper Title Other Keywords Page
MOIOA02 Commissioning of the Low-Energy Part of Linac4 emittance, linac, DTL, solenoid 6
 
  • A.M. Lombardi
    CERN, Geneva, Switzerland
  
  The Linac4 front-end (3MeV) was first commissioned in a dedicated test stand and then moved to its final position in the Linac4 tunnel. Accelerating cavities will be added progressively over two years to allow the characterisation of the beam with a dedicated measurement line at several energy stages (3,12,30,50, 100 and finally160MeV). This paper reports about the progress and the commissioning experience up to today.  
slides icon Slides MOIOA02 [5.339 MB]  
 
MOPP025 Longitudinal Beam Profile Measurements in Linac4 Commissioning cavity, linac, electron, emittance 108
 
  • G. Bellodi, V.A. Dimov, J.-B. Lallement, A.M. Lombardi, U. Raich, F. Roncarolo, F. Zocca
    CERN, Geneva, Switzerland
  • M. Yarmohammadi Satri
    IPM, Tehran, Iran
  
  Linac4, the future 160 MeV H− injector to the CERN Proton Synchrotron Booster, is presently under construction at CERN as a central step of the planned upgrade of the LHC injectors. The Linac front-end, composed of a 45 keV ion source, a Low Energy Beam Transport (LEBT), a 352.2 MHz Radio Frequency Quadrupole (RFQ) and a Medium Energy Beam Transport (MEBT) housing a beam chopper, has been installed and commissioned. Precise measurements of the longitudinalμbunch profiles of ion beams were possible with the help of a Bunch Shape Monitor (BSM) developed at INR Moscow. These were crucial for the successful commissioning of the three RF buncher cavities mounted along the MEBT and well complemented with higher precision the information provided in parallel by spectrometer measurements.  
 
MOPP050 Transmission Efficiency Measurement at the FNAL 4-rod RFQ solenoid, space-charge, simulation, ion 168
 
  • J.-P. Carneiro, F.G. Garcia, J.-F. Ostiguy, A. Saini, R.M. Zwaska
    Fermilab, Batavia, Illinois, USA
  • B. Mustapha, P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  
  This paper presents measurements of the beam transmission performed on the 4-rods RFQ currently under operation at Fermilab. The beam current has been measured at the RFQ exit as a function of the magnetic field strength in the 2 LEBT solenoids. This measurement is compared with a scan performed on the Fermi Grid with the beam dynamics code TRACK. A particular attention is given to the impact, on the RFQ beam transmission, of the space-charge neutralization in the LEBT and of the field asymmetry on the 4-rods RFQ.  
 
MOPP060 Status of the GSI Poststripper - HE-Linac DTL, linac, ion, simulation 190
 
  • S. Mickat, W.A. Barth, G. Clemente, X. Du, L. Groening, A. Orzhekhovskaya, B. Schlitt, H. Vormann, C. Xiao, S.G. Yaramyshev
    GSI, Darmstadt, Germany
  • M. Droba, H. Hähnel, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main, Germany
  
  The High-Energy (HE) Linac is proposed to substitute the existing UNILAC post-stripper section. The post-stripper is an Alvarez DTL, which is in operation over four decades successfully. A quasi Front-to-End simulation along the UNILAC shows, that by taking future upgrade options into account already, with the existing Alvarez section the Fair requirements are not reached. Even by substituting the Alvarez section by the HE Linac the aim is not reached per se regarding the existing boundary conditions. Currently workpackages are defined together with the Institute of Applied Physics at Frankfurt University. Starting from the Ion sources to the SIS18 transfer channel every section is reinvestigated for improvements in beam quality and intensity.  
 
MOPP062 Proposal of a Conventional Matching Section as an Alternative to the Existing HSI MEBT Superlens at GSI UNILAC DTL, simulation, emittance, cavity 196
 
  • H. Hähnel, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main, Germany
  
  We propose a new design for the HSI MEBT section at GSI UNILAC as part of the planned UNILAC upgrade. The existing MEBT section was designed in 1996 and based on a novel concept called the superlens* which uses a magnetic quadrupol doublet lens combined with a short RFQ cavity for transversal and longitudinal focusing. In 2009 the RFQ section in front of the MEBT was upgraded which led to significant changes in the RFQ output particle distribution. Recent LORASR simulations show that the superlens transmission decreases to 90% (related to 20.75 mA, U4+ at input). Moreover, the matching to the following IH-DTL is not ideal. This leads to further losses in the IH and to a decrease of the overall UNILAC efficiency. To reach the FAIR requirement of 18 mA U4+ current for the UNILAC with minimal losses and to provide more flexibility for varying current level operation, a new design based on two magnetic quadrupole triplet lenses and a 2-gap buncher is proposed. The design shows full transmission at 20.75 mA U4+ current and improved matching to the IH-DTL, leading to a drastic decrease of particle losses along the IH-DTL.
* U. Ratzinger, R. Tiede, A New Matcher Type between RFQ and IH-DTL for the GSI High Current Heavy Ion Prestripper LINAC, Proc. LINAC96, Geneva, Switzerland, pp. 128-130 		 
poster icon Poster MOPP062 [9.440 MB]  
 
MOPP064 R&D of the 17 MeV MYRRHA Injector emittance, cavity, proton, linac 202
 
  • D. Mäder, M. Basten, D. Koser, H.C. Lenz, N.F. Petry, H. Podlech, A. Schempp, M. Schwarz, M. Vossberg
    IAP, Frankfurt am Main, Germany
  • C. Zhang
    GSI, Darmstadt, Germany
  
  Funding: Project supported by the EU, FP7 MAX, Contract No. 269565
MYRRHA is designed as an accelerator driven system (ADS) for transmutation of long-lived radioactive waste. The challenge of the linac development is the very high reliability of the accelerator to limit the thermal stress inside the reactor. With the concept of parallel redundancy the injector will supply a cw proton beam with 4 mA and 17 MeV to the main linac. The new MYRRHA injector layout consists of a very robust beam dynamics design with low emittance growth rates. Sufficient drift space provides plenty room for diagnostic elements and increases the mountability. Behind a 4-Rod-RFQ and a pair of two-gap QWR rebunchers at 1.5 MeV the protons are matched into the CH cavity section. A focussing triplet between the rebunchers ensures an ideal transversal matching into the doublet lattice. Each of the 7 RT CH structures has a constant phase profile and does not exceed thermal losses of 29 kW/m. The transition to the 5 SC CH cavities with constant beta profile is at 5.9 MeV. For a safe operation of the niobium resonators the electric and magnetic peak fields are defined below 25 MV/m and 57 mT respectively. 		 
poster icon Poster MOPP064 [4.024 MB]  
 
MOPP067 Operation of the LINAC and the LINAC RF System for the Ion-Beam Therapy Center Heidelberg ion, linac, operation, DTL 211
 
  • E. Feldmeier, R. Cee, Th. Haberer
    HIT, Heidelberg, Germany
  
  The Heidelberg Ion Therapy Center HIT is in clinical operation since 2009. It is the first dedicated european particle accelerator for medical treatment. Its central location on the campus of the Heidelberg University Hospital fits perfectly in the clinical everyday life. The accelerator complex consists of a linear accelerator and a synchrotron and is designed for protons and carbon ions, but can also provide helium and oxygen ions. The LINAC, build in 2006, operates since 5 years in a 24/7 schema which leads to 60000 operating hours up to now. The performance with an availibility of better than 99% is much higher than expected and is caused by a solid design and a well planned and foresighted maintenance. Unavoidable failures during operation can be solved very fast with the on site experts for each section. The combination of personnel spare parts and permanent ongoing developments is very successful. An upgrade program for parts of the linac and also for the RF system is in planning to keep the uptime high and to improve the performance for further needs.  
 
MOPP076 Construction of an Accelerator-based BNCT Facility at yhe Ibaraki Neutron Medical Research Center target, neutron, linac, klystron 230
 
  • M. Yoshioka, H. Kobayashi, T. Kurihara, S.-I. Kurokawa, H. Matsumoto, N. Matsumoto
    KEK, Ibaraki, Japan
  • T. Hashirano, T. Sugano
    MHI, Hiroshima, Japan
  • F. Hiraga
    Hokkaido University, Sapporo, Japan
  • H. Kumada, Su. Tanaka
    Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan
  • A. Matsumura, H. Sakurai
    Tsukuba University, Ibaraki, Japan
  • N. Nagura, T. Ohba
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture, Japan
  • T.N. Nakamoto, T. Zagar
    Cosylab, Ljubljana, Slovenia
  • T. Nakamura
    JAEA, Ibaraki-ken, Japan
  • T. Ouchi
    ATOX, Ibaraki, Japan
  
  An accelerator-based BNCT (Boron Neutron Capture Therapy) facility is being constructed at the Ibaraki Neutron Medical Research Center. It consists of a proton linac of 80kW beam power with 8 MeV energy and 10mA average current, a beryllium target, and a moderator system to provide an epi-thermal neutron flux enough for patient treatment. The technology choices for this present system were driven by the need to site the facility in a hospital and where low residual activity is essential. The maximum neutron energy produced from an 8 MeV-proton is 6 MeV, which is below the threshold energy of the main nuclear reactions which produce radioactive products. The down side of this technology choice is that it produces a high density heat load on the target so that cooling and hydrogen aniti-blistering amelioration prevent sever challenges requiring successful R&D progress. The latest design of the target and moderator system shows that a flux of 4×109 epi-thermal neutrons / cm2 / sec can be obtained. This is much higher than the flux from the existing nuclear reactor based BNCT facility at JAEA ( JRR-4).  
 
MOPP087 Construction of the Modules of the IFMIF-EVEDA RFQ status, simulation, controls, survey 257
 
  • A. Pepato, E. Fagotti, F. Grespan, A. Palmieri, A. Pisent, C. R. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  • R. Dima, L. Ferrari, E. Udup
    INFN- Sez. di Padova, Padova, Italy
  • A. Margotti
    INFN-Bologna, Bologna, Italy
  • P. Mereu
    INFN-Torino, Torino, Italy
  
  The IFMIF project aims to produce an intense neutron flux to test and qualify materials suitable for the construction of fusion power plants. We are working on the engineering validation phase of the project, which consists on the construction of a linear accelerator prototype to be installed and commissioned in Rokkasho. The RFQ is composed of 18 modules flanged together for a total length of 9.8m designed to accelerate the 125mA D+ beam to 5MeV at a frequency of 175MHz. The mechanical specifications are very challenging, tight tolerances are required on the machining and on the brazing process. The line is subdivided into 3 Super Modules of 6 modules each. The production of the High Energy portion has been completed and delivered, while the Low Energy one is performing the acceptance test. They were commissioned to external firms. The production of the Intermediate Energy portion has been done in house (INFN) and will be commissioned soon. The 1st modules (16, 17 and 2) were produced adopting 2 brazing steps, while for all the remaining ones we adopted a single brazing step. In this paper the production status and the development of the brazing procedure will be described.  
 
MOPP088 MUNES a Compact Neutron Source for BNCT and Radioactive Wastes Characterization neutron, target, proton, quadrupole 261
 
  • A. Pisent, P. Colautti, E. Fagotti
    INFN/LNL, Legnaro (PD), Italy
  
  At INFN LNL (Legnaro Italy) it has been built a high intensity Radio Frequency Quadrupole (RFQ) structure, able to produce a 5 MeV proton beam of 30 mA. Coupled with a Be target such a beam can generate a neutron flux of 1014 n/s, with a spectrum centered in the MeV region (that has been recently characterized in detail at LNL accelerators). This neutron flux can be moderated to generate a thermal or epithermal source for BNCT with very little contamination of energetic form energetic neutron and gamma. Since the approval of MUNES project (in 2012) the high technology issues related to a compact neutron source to be installed in an Hospital environment have been faced. In particular for the powering of the accelerating structure an innovative system, completely based on solid state amplifiers, has been developed and ordered to industry. An outline of MUNES design and the status of the project will be given in the paper.  
 
MOPP091 Beam Test of a New RFQ for the J-PARC Linac linac, simulation, emittance, experiment 267
 
  • Y. Kondo, T. Morishita, Y. Sawabe, S. Yamazaki
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • T. Hori
    JAEA, Ibaraki-ken, Japan
  • A. Takagi
    KEK, Ibaraki, Japan
  
  We performed a beam test of a new 324-MHz 3-MeV RFQ (RFQ III) for the beam-current upgrade of the J-PARC linac. RFQ III is the first RFQ developed to meet the requirement of the J-PARC linac. The peak beam current is 50mA, pulse length is 500 micro-sec, and the repetition is 25 Hz. Before the installation to the accelerator tunnel scheduled in summer of 2014, we built a test stand for offline testing of the new ion source and RFQ. Basic performances of RFQ III such as transmission, transverse emittance, and energy spread were measured with short pulse length beams. In this paper, we present the results of the beam test.  
 
MOPP099 Compact Proton Injector for Synchrotrons linac, proton, cavity, quadrupole 291
 
  • A.D. Kovalenko, A.V. Butenko
    JINR, Dubna, Moscow Region, Russia
  • A. Kolomiets, A.S. Plastun
    ITEP, Moscow, Russia
  
  Compact linac comprising two sections of different RFQ structures was designed. The first section is conventional RFQ with output energy 3 MeV whereas the second one is RFQ with trapezoidal modulation of vanes. The linac output energy is 8 MeV. The both structures operate at frequency of 352 MHz. The total length of machine is less than 8 m. The output pulsed beam current is of 40 mA. The design is suitable for both as NICA injection complex and proton superconducting medical synchrotron.  
 
MOPP101 Design of the 4MeV RFQ for the Helium Beam Irradiatior controls, ion, ion-source, cavity 294
 
  • H.-J. Kwon, Y.-S. Cho, H.S. Kim, K.T. Seol, Y.-G. Song
    KAERI, Daejon, Republic of Korea
  
  Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
A RFQ is considered as a main accelerator of the helium beam irradiation system for the power semiconductor in Korea Multipurpose Accelerator Complex (KOMAC). The RFQ was designed to accelerate the He2+ beam up 4MeV with 10mA peak beam current. We chose a vane type RFQ with 200MHz operating frequency. The RFQ will be operated with the frequency tracking mode supplied by the digital low level rf control system. In this paper, the design of the 4MeV RFQ is presented and the beam irradiation system including rf system, control system, utility system, is discussed. 		 
 
MOPP112 Beam Dynamics of Multi Charge State Ions in RFQ Linac ion, laser, acceleration, ion-source 317
 
  • Y. Fuwa, S. Ikeda, M. Kumaki
    RIKEN, Saitama, Japan
  • Y. Fuwa, Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Kanesue, M. Okamura
    BNL, Upton, Long Island, New York, USA
  
  Laser ion source with DPIS (Direct Plasma Injection Scheme) is a promising candidate for a pre-injector of the high-intensity accelerator. Eliminating LEBT (Low Energy Beam Transport) where the space charge effect is severe, DPIS provides high current ion beam from laser plasma at the entrance of a RFQ linac and ion beams are injected directly into the RFQ linac. However, the injected beam consists of multi charge state ions and their behavior in RFQ linac has not been well understood. In this research, we study the beam dynamics of multi charge state ions in a RFQ. Using the result of computer simulation, a set of 100MHz 4-rod RFQ vanes, which accelerates Al 12+ ion among various charge states of aluminum ions from 8.9 keV/u to 200 keV/u, is newly designed and fabricated to be tested with beams. The result of beam acceleration test using the vane will be reported.  
 
MOPP114 SNS Linac Upgrade Plans for the Second Target Station linac, cryomodule, klystron, cavity 320
 
  • J. Galambos, D.E. Anderson, M.P. Howell, S.-H. Kim, M.A. Plum, A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
  • M.E. Middendorf
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The Second Target Station (STS) upgrade for the Spallation Neutron Source (SNS) proposes the addition of a short pulse, long wavelength neutron scattering station. In order to provide world-class intensity at the additional station, the SNS linac beam power capability is doubled, to 2.8 MW. This will be accommodated by a 30% increase in the beam energy to 1.3 GeV and a 50% increase in beam current. The beam energy increase will be provided by the addition of 7 additional cyro-modules and supporting RF equipment in space provided during the original SNS construction. The beam current increase will be provided by improved ion source and a reduced chopping fraction, and will require increases in the RF and high voltage modulator systems to accommodate the additional beam loading. Initial plans will be presented. The proposed linac upgrade path will be described. 		 
 
MOPP120 Beam Dynamic Design of a 100 mA, 162.5 Mhz High-Current Linac linac, emittance, quadrupole, experiment 336
 
  • F.J. Jia, J.E. Chen, Y.R. Lu, Z. Wang, W.L. Xia, X.Q. Yan, K. Zhu
    PKU, Beijing, People's Republic of China
  • W.P. Dou, Y. He
    IMP, Lanzhou, People's Republic of China
  
  Funding: This work is supported by the 973 program (No. 2014CB845503) and the NSFC (Grants No. 11079001).
The beam dynamic design of a 100 mA, 162.5 MHz Radio Frequency Quadrupole (RFQ) is presented in this paper. The RFQ will accelerate protons from 85 keV to 3 MeV under the operation mode of continuous-wave (CW). The code PARMTEQM is used to carry out the beam dynamics design and the transmission efficiency has been optimized and improved to more than 99%. In the design of this high-current linac, the space charge effect is analyzed as it can cause emittance growth, nonuniform particle density distribution and resonance effect. The electrode structure parameters generated by PARMTEQM also be adopted by the code of Toutatis to verify the result’s veracity. 		 
 
MOPP124 Development of a 3 MeV Prototype RFQ Structure for High Intensity Proton Linac for ISNS vacuum, ion, operation, proton 345
 
  • S.C. Joshi, A. Chaturvedi, S.K. Chauhan, K.K. Das, G.V. Kane, S.V. Kokil, B. Oraon, S. Raghvendra, N.K. Sharma
    RRCAT, Indore (M.P.), India
  
  Raja Ramanna Centre for Advanced Technology (RRCAT) has taken up a program on R&D activities of a 1 GeV, high intensity superconducting proton linac for a spallation neutron source. A 3 MeV Radio Frequency Quadrupole (RFQ) will be used as front end of the pulsed proton linac. A full scale prototype RFQ structure has been designed and fabricated to validate the physics design and manufacturing procedures. The total of 3.46 meter has been divided in three segments for ease in machining. The fabricated RFQ structure has been assembled for low power RF characterization. The RFQ frequency and field tuning exercise is being carried out using 48 stub tuners. The paper will also present the engineering design aspects and fabrication issues for the full scale RFQ structure.  
 
MOPP129 Status of the FETS Project proton, emittance, ion-source, ion 361
 
  • A.P. Letchford, M.A. Clarke-Gayther, D.C. Faircloth, S.R. Lawrie
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • S.M.H. Alsari, M. Aslaninejad, 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, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • R.T.P. D'Arcy, S. Jolly
    UCL, London, United Kingdom
  • M. Dudman, J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • D.C. Plostinar
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  The Front End Test Stand (FETS) under construction at RAL is a demonstrator for front end systems of a future high power proton linac. Possible applications include a linac upgrade for the ISIS spallation neutron source, new future neutron sources, accelerator driven sub-critical systems, high energy physics proton drivers etc. Designed to deliver a 60mA H-minus beam at 3MeV with a 10% duty factor, FETS consists of a high brightness ion source, magnetic low energy beam transport (LEBT), 4-vane 324MHz radio frequency quadrupole, medium energy beam transport (MEBT) containing a high speed beam chopper and non-destructive laser diagnostics. This paper describes the current status of the project and future plans.  
 
MOPP137 Design Progress of the MYRRHA Low Energy Beam Line emittance, solenoid, ion, proton 381
 
  • R. Salemme, L. Medeiros Romão, D. Vandeplassche
    Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium
  • M.A. Baylac, D. Bondoux, F. Bouly, J.-M. De Conto, E. Froidefond
    LPSC, Grenoble Cedex, France
  • J.-L. Biarrotte
    IPN, Orsay, France
  • D. Uriot
    CEA/DSM/IRFU, France
  
  The MYRRHA project, a flexible spectrum neutron irradiation facility, is designed according to the Accelerator Driven System (ADS) reactor concept. The MYRRHA driver consists of a high power superconducting proton LINAC. A prototype of the front end injector is being built up into a test platform conceived to experimentally address its design issues. Currently, the ECR proton source has been industrially procured. LPSC Grenoble designed the subsequent Low Energy Beam Transport (LEBT) section. Right before the RFQ, a short section hosts an electrostatic beam chopper producing carefully controlled beam interruptions. In this paper the status of the LEBT design with the associated beam instrumentation is reviewed. Future experimental plans including LEBT beam characterization and optimization of the beam transmission are presented.  
 
TUIOB03 Commissioning of Energy Upgraded Linac of J-PARC linac, klystron, injection, operation 417
 
  • K. Hasegawa
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  
  To realize a full potential of J-PARC facility (1MW at 3 GeV), the J-PARC linac is upgraded from 181 MeV to 400 MeV by using an annular-ring coupled structure linac (ACS). The ACS modules and peripheral system were installed and commissioned in summer to autumn of 2013. Beam commissioning is about to start and results will be expected.  
slides icon Slides TUIOB03 [4.905 MB]  
 
TUPP005 Completion of Efficiency and Intensity Upgrade of the ATLAS Facility cryomodule, cavity, solenoid, ion 449
 
  • P.N. Ostroumov, Z.A. Conway, C. Dickerson, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, Y. Luo, S.W.T. MacDonald, R.C. Murphy, B. Mustapha, R.C. Pardo, T. Reid, S.I. Sharamentov, K.W. Shepard, J.R. Specht, G.P. Zinkann
    ANL, Argonne, USA
  • A. Perry
    Illinois Institute of Technology, Chicago, Illlinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
The ANL Physics Division has completed a major upgrade of the ATLAS National User Facility by successfully installing a new RFQ and cryomodule. The new normal conducting CW RFQ capable of providing 295 keV/u beams of any ion with m/q ≤7 from protons to uranium was fully integrated into ATLAS and has been in routine operation for more than a year. The RFQ doubled the efficiency of beam delivery to targets and opened the possibility to accelerate much higher intensity beams. Recently, the new cryomodule containing 7 high-performance 72.75 MHz superconducting quarter-wave resonators and 4 superconducting solenoids was successfully commissioned with beam. New design and fabrication techniques for these resonators resulted in record high voltages which were achieved during the beam commissioning. The new cryomodule provides 17.5 MV accelerating voltage which will be gradually raised by increasing the input RF power and improving LLRF system. The new cryomodule, which replaced 3 old cryomodules that used split-ring cavities, is also essential for high intensity stable beams. Results of beam commissioning and operation of ATLAS with the new RFQ and cryomodule will be presented. 		 
 
TUPP025 Progress on ESS Medium Energy Beam Transport linac, quadrupole, cavity, DTL 484
 
  • I. Bustinduy, D. Fernandez-Cañoto, N. Garmendia, A. Ghiglino, O. González, P.J. González, Z. Izaola, I. Madariaga, M. Magan, L. Muguira, J.L. Muñoz, I. Rueda, F. Sordo, S. Varnasseri, R. Vivanco
    ESS Bilbao, Bilbao, Spain
  • M. Eshraqi, R. Miyamoto, A. Ponton
    ESS, Lund, Sweden
  
  The considered versatile ESS MEBT is being designed to achieve four main goals: First, to contain a fast chopper and its correspondent beam dump, that could serve in the commissioning as well as in the ramp up phases. A detailed study of the chopper rise time effects on the loss budget will be presented. Second, to serve as a halo scraping section by means of various adjustable blades. Third, to measure the beam phase and profile between the RFQ and the DTL, along with other beam monitors. And finally, to match the RFQ output beam characteristics to the DTL input both transversally and longitudinally. For this purpose a set of eleven quadrupoles is used to match the beam characteristics transversally, combined with three 352.2 MHz CCL type buncher cavities, which are used to adjust the beam in order to fulfil the required longitudinal parameters. A thorough study on the optimal input beam parameters will be discussed. Quadrupole design update will be presented along with new RF measurements over the buncher prototype. Finally, updated results will be presented on the chopper and beam-dump system.  
poster icon Poster TUPP025 [5.596 MB]  
 
TUPP038 Transverse Beam Profile Measurements in the Linac4 Medium Energy Beam Transport emittance, simulation, linac, quadrupole 516
 
  • M. Yarmohammadi Satri, G. Bellodi, V.A. Dimov, J.-B. Lallement, A.M. Lombardi, U. Raich, F. Roncarolo, F. Zocca
    CERN, Geneva, Switzerland
  
  Linac4 is a 160 MeV H− linear accelerator presently under construction at CERN. It will replace the present 50 MeV proton Linac2 as injector of the proton accelerator complex as part of a project to increase the LHC luminosity. The Linac4 front-end, composed of a 45 keV ion source, a Low Energy Beam Transport (LEBT), a 352.2 MHz Radio Frequency Quadrupole (RFQ) which accelerates the beam to 3 MeV and a Medium Energy Beam Transport (MEBT) housing a beam chopper, has been commissioned in the Linac4 tunnel. The MEBT is composed of three buncher cavities and 11 quadrupole magnets to match the beam from the RFQ to the next accelerating structure (DTL) and it includes two wire scanners for beam profile measurement. In this paper we present the results of the profile measurements and we compare them with emittance measurements taken with a temporary slit-and-grid emittance measurement device located after the MEBT line.  
 
TUPP047 PXIE RFQ Bead Pull Measurements beam-transport, cavity, quadrupole, experiment 535
 
  • P. Berrutti, T.N. Khabiboulline, V. Poloubotko, G.V. Romanov, J. Steimel, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • D. Li, J.W. Staples
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by D.O.E. Contract No. DE-AC02-07CH11359
Project X Injector Experiment radio frequency quadrupole has recently been built for Fermilab by Berkley laboratory. This RFQ will be placed after the low energy beam transport (LEBT) and before the medium energy beam transport (MEBT). The RFQ will operate at 162.5 MHz in CW regime; its function is to accelerate and focus particles coming from the LEBT at 30 keV, and to deliver a beam at 2.1 MeV to the MEBT. In order to make sure that the RFQ meets the specifications of field flatness and frequency the field in the vanes should be measured using bead pull technique. FNAL created a new single wire bead pull set up for the RFQ of PXIE. The measurements are used to find the electrical center of the structure, then the amplitude of the electromagnetic field in all the sectors of the RFQ; and the tuning will be based on these measurements. This paper describes the bead pull experimental set up, the software developed for this particular application and the measurements taken. 		 
poster icon Poster TUPP047 [1.089 MB]  
 
TUPP057 In Situ Measurement of Mechanical Vibrations of a 4-Rod RFQ at GSI laser, operation, vacuum, quadrupole 553
 
  • P. Gerhard, L. Groening, K.-O. Voss
    GSI, Darmstadt, Germany
  
  A new 4-rod CW Radio Frequency Quadrupole was commissioned at the high charge state injector HLI at the UNILAC in 2009. It is in operation since 2010*. At high rf amplitudes strong modulations of the rf reflection emerge, with a modulation frequency of approximately 500 Hz. They are attributed to mechanical oscillations of the rods, excited by the rf pulse. The high fraction of reflected rf power severely limits the pulse length and rf amplitude achievable. As these modulations could only be seen during the rf pulse by means of rf measurements, a direct observation of the mechanical vibrations was desirable. Such measurements have been conducted using a commercial laser vibrometer, allowing for the investigation of the mechanical behavior of the RFQ independent of the presence of rf power. After a short introduction of the method, the results will be presented and compared with rf measurements and simulations.
*: P. Gerhard et al., “Experience with a 4–Rod CW RFQ”, LINAC’12, Sept. 2012, Tel Aviv, THPB035 		 
 
TUPP059 Advanced Beam Matching to a High Current RFQ quadrupole, simulation, emittance, ion 559
 
  • S.G. Yaramyshev, W.A. Barth, L.A. Dahl, P. Gerhard, L. Groening, M.T. Maier, S. Mickat, A. Orzhekhovskaya, B. Schlitt, H. Vormann
    GSI, Darmstadt, Germany
  
  The High Current Injector (HSI) of the heavy ion linac UNILAC at GSI comprises the transport lines, the RFQ and two DTL tanks. Beam matching to the RFQ acceptance with a magnetic quadrupole quartet has been worked out manually during commissioning and operation of the machine. Due to a strong overlapping of the field from neighboring quadrupole lenses, a standard optics calculation does not provide for the required reliability. Advanced beam dynamics simulations have been done with the macroparticle code DYNAMION. The superposition of the measured magnetic fields of each quadrupole was taken into account. The quadrupole settings were optimized using the Monte-Carlo method. Two solutions have been found in accordance with the general theory of particle optics. Beam dynamics simulations with new quadrupole settings show an increased particle transmission through the RFQ. The results of numerical study have been confirmed during experimental campaigns. An improved performance of the whole HSI has been demonstrated. The proposed algorithm and a comparison of the measured data with result of simulations are presented.  
 
TUPP093 The Couplers for the IFMIF-EVEDA RFQ High Power Test Stand at LNL: Design, Construction and Operation cavity, coupling, vacuum, simulation 643
 
  • E. Fagotti, L. Antoniazzi, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, C. R. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  
  In order to assess the critical aspects of the IFMIF-EVEDA RFQ construction procedure and operation, it was decided to perform a High Power Test of a subset of the RFQ consisting in its last 550 mm three modules (out of 18) plus a Prototype Module, 390 mm long, used as RF plug. These modules are going to be tested at full power in CW of INFN LNL Labs, in the so-called RFQ High Power Test Stand. For such a purpose, a RF tube-based amplifier capable of 220 kW CW output power at the operational frequency of 175 MHz was purchased from an Italian company. A critical component of this test is the RF power coupler. Therefore INFN-LNL developed a design of two identical water-cooled loop antenna couplers, built with OFE copper and vacuum sealed with a commercially available 6”1/8 Alumina planar window. These couplers were tested separately on an aluminium coupling cavity. In particular one of them acts as a power feeder, while the other one, connected with a 200 kW water-cooled load, acts as a receiver. In this paper, the main aspects of the design, construction and tests performed on the couplers and coupling cavity will be described.  
 
TUPP095 High-Power Test Results of the RFQ III in J-PARC Linac operation, cavity, vacuum, ion 649
 
  • T. Morishita, K. Hasegawa, K. Hirano, Y. Kondo, H. Oguri, S. Yamazaki
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • T. Hori
    JAEA, Ibaraki-ken, Japan
  • F. Naito, T. Sugimura, A. Takagi
    KEK, Ibaraki, Japan
  
  The J-PARC accelerator comprises an injector linac, a 3-GeV Rapid-Cycling Synchrotron and a 50-GeV Main Ring. The beam energy of the linac has been upgraded from 181MeV to 400MeV in 2013. For the beam current upgrade, the new frontend (RF ion source, RFQ, chopping system) installation is scheduled in summer 2014 for 1MW operation at RCS. The RFQ III, which is designed for 50mA beam acceleration from 0.05MeV to 3MeV, has been fabricated and the high-power test has started at April 2013 at the test station in the J-PARC. The test station consists of the ion source, the LEBT, the RFQ, and the diagnostics devices. The nominal RF power and RF duty of the RFQ III are 380kW and 3%(0.6ms and 50Hz), respectively. The high-power conditioning reached to the 120% of the nominal power with 1.5% (0.6ms, 25Hz) RF duty within 24 hours. Then, we performed the beam operation at the test station and measured beam parameters after the RFQ III. The results of the high-power conditioning and the stability of the RFQ operation with beam will be discussed.  
 
TUPP113 High RF Power Test of Coupled RFQ-SFRFQ Cavity cavity, simulation, impedance, detector 689
 
  • W.L. Xia, J.E. Chen, S.L. Gao, F.J. Jia, Y.R. Lu, Z. Wang, J. Zhao, K. Zhu
    PKU, Beijing, People's Republic of China
  
  Funding: This work was supported in part by the National Natural Science Foundation of China under Grant No. 11075008, 11079001 and 11175009.
A new combined accelerator that couples radio frequency quadrupole (RFQ) and separated function radio frequency quadrupole (SFRFQ) in a single cavity has been designed and manufactured. Recently, the performance of the cavity under high RF power was tested with an upgraded RF power source. The inter-vane voltages of both RFQ section and SFRFQ section were measured by using high purity germanium detector and the corresponding measurement system. The measured shunt impedance is about 546.9 kΩ•m, which means the cavity needs 19.5 kW for the designed inter-vane voltage of 65 kV. The results are well consistent with the cavity design. 		 
poster icon Poster TUPP113 [0.764 MB]  
 
TUPP130 Optimization of Beam Parameters in APF Channel linac, controls, simulation, emittance 722
 
  • V.V. Altsybeyev, D.A. Ovsyannikov
    St. Petersburg State University, St. Petersburg, Russia
  
  A new approach based on mathematical optimization methods to obtain a synchronous phase sequence in APF linacs is suggested. The optimization problem of intensity deuteron beam parameters is discussed. As an example, the results of beam dynamics simulations are presented.  
 
TUPP139 Design Studies with DEMIRCI for SPP RFQ software, interface, ion, cavity 740
 
  • B. Yasatekin, G. Turemen
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • A. Alacakir
    TAEK, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  
  To design a Radio Frequency Quadrupole (RFQ) is a onerous job which requires a good understanding of all the main parameters and the relevant calculations. Up to the present there are only a few software packages performing this task in a reliable way. These legacy software, though proven in time, could benefit from the modern software development tools like Object Oriented (OO) programming. In this note, a new RFQ design software, DEMIRCI is introduced. It is written entirely from scratch using C++ and based on CERN's OO ROOT library. It has a user friendly graphical user interface and also a command line interface for batch calculations. It can also interact by file exchange with similar software in the field. After presenting the generic properties of DEMIRCI, its compatibility with similar software packages is discussed based on the results from the reference design parameters of SPP (SNRTC Project Prometheus), a demonstration accelerator at Ankara, Turkey.  
poster icon Poster TUPP139 [11.590 MB]  
 
WEIOA05 High Power RF Sources for the ESS RF Systems klystron, linac, operation, DTL 756
 
  • M. Jensen, G. Göransson, C. Marrelli, C. Martins, R. Montaño, A. Sunesson, R.A. Yogi, R. Zeng
    ESS, Lund, Sweden
  • A.J. Johansson
    Lund University, Lund, Sweden
  
  The RF system for ESS will consist of around 150 high power RF sources and will deliver 125 MW peak power to the proton beam during the 2.86 ms pulse with an average power of 5 MW. The two RF frequencies, 352 and 704 MHz, the different power requirements along the linac and the sources currently available strongly influence the choice of RF technology. This talk will focus on the high power RF solutions for the main parts of the linac. We present an overview of the available technology along with the first test results of the main sources. Additionally, we will present the preliminary design of a new 1.2 MW multi-beam super power IOT being designed together with industry for the high beta section of the linac.  
slides icon Slides WEIOA05 [5.090 MB]  
 
WEIOB01 Chopping High-Intensity Ion Beams at FRANZ proton, ion, ion-source, solenoid 765
 
  • C. Wiesner, M. Droba, O. Meusel, D. Noll, O. Payir, U. Ratzinger, P.P. Schneider
    IAP, Frankfurt am Main, Germany
  
  The accelerator-driven Frankfurt Neutron Source FRANZ is under construction at the science campus of Frankfurt University. Its Low-Energy Beam Transport (LEBT) line also serves as test stand for transport and chopping experiments with high-intensity ion beams. The high-current proton source was tested successfully with dc currents above 200 mA . The LEBT section consisting of four solenoids and a 250 kHz, 120 ns chopper was successfully commissioned using a helium test beam at low beam currents. Transport simulations including space-charge compensation and measurements are discussed. Simulations and experimental results of the novel LEBT chopper using a Wien-filter type field array and pulsed electrode voltages of up to ±6kV will be presented.  
slides icon Slides WEIOB01 [7.925 MB]  
 
WEIOB02 SARAF Phase-I Proton / Deuteron Linac Beam Operation Status operation, target, proton, neutron 770
 
  • A. Kreisel, A. Arenshtam, Y. Ben Aliz, D. Berkovits, Y. Buzaglo, O. Dudovich, Y. Eisen, I. Eliyahu, G. Feinberg, I. Fishman, I.G. Gertz, A. Grin, S. Halfon, Y.F. Haruvy, T. Hirsch, D. Hirschmann, Z. Horvitz, B. Kaizer, D. Kijel, J. Luner, I. Mor, J. Rodnizki, G. Shimel, A. Shor, I. Silverman, D. Vartsky, L. Weissman, E. Zemach
    Soreq NRC, Yavne, Israel
  
  SARAF Phase-I linac is the first accelerator to demonstrate acceleration of variable energy 2 mA CW proton beam. Such intense beam is used in SARAF Phase-I to irradiate a liquid lithium jet target for nuclear astrophysics studies. Several improvements were necessary to allow beam operation with such high current. The improvements include a DC bias that was introduced on the cavity RF coupler to reduce coupler heating. A new slow chopper was commissioned to enable increase the current by increasing the duty cycle with fewer changes in the beam optics. A beam dump was developed to allow beam studies of a 2 mA CW proton beam. The beam dump is based on tungsten pins which distributes, by radiation, the high beam power over a large area which is then easily water cooled. While most of beam tuning is done using a low intensity pilot beam, some nondestructive methods were studied to monitor the high intensity beam. These include a current transformer and a residual gas monitor (RGM) to monitor beam transverse distribution. Additional valuable information about the beam current and energy is gained from measurements of the nuclear reaction products of the proton on lithium targets.  
slides icon Slides WEIOB02 [3.027 MB]  
 
WEIOB03 Status of RAON Heavy Ion Accelerator Project ion, cavity, linac, target 775
 
  • D. Jeon, H.J. Kim
    IBS, Daejeon, Republic of Korea
  
  Funding: This work was supported by the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning (MSIP) and the NRF of Korea under Contract 2013M7A1A1075764.
Construction of the RAON heavy ion accelerator facility is under way in Korea to build the In-flight Fragment (IF) and Isotope Separation On-Line (ISOL) facilities to support cutting-edge researches in various science fields. At present prototyping of major components are proceeding including 28 GHz ECR ion source, RFQ, superconducting cavities, magnets and cryomodules. Superconducting magnets of 28 GHz ECR ion source are fabricated and tested. First article of prototype superconducting cavities are delivered that were fabricated through domestic vendors. Prototype HTS quadrupole is under development. Progress report of the RAON accelerator systems is presented. 		 
slides icon Slides WEIOB03 [6.228 MB]  
 
WEIOB04 CW Heavy Ion Accelerator With Adjustable Energy for Material Science ion, cavity, linac, heavy-ion 780
 
  • S.V. Kutsaev, B. Mustapha, J.A. Nolen, P.N. Ostroumov
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357
The proposed eXtreme MATerial (XMAT) research facility at ANL’s Advanced Photon Source (APS) combines medium-energy heavy-ion accelerator capability with the high-energy X-ray analysis to enable rapid in situ mesoscale bulk analysis of ion radiation damage in advanced materials and nuclear fuels. The XMAT facility requires CW heavy ion accelerator with adjustable beam energy in the range of 300 keV/u to 1.25 MeV/u. Such an accelerator has been developed and based on ECR, normal conducting RFQ and multi-gap quarter wave resonators (QWR) operating at 60 MHz. This talk will present complete 3D beam dynamics studies and multi-physics design of both RFQ and QWRs. The design includes a beam transport system capable to focus ions into 20-micron diameter spot on the target. 		 
slides icon Slides WEIOB04 [1.159 MB]  
 
THPP014 Catalogue of Losses for the Linear IFMIF Prototype Accelerator simulation, beam-losses, operation, distributed 860
 
  • N. Chauvin, P.A.P. Nghiem, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • M. Comunian
    INFN/LNL, Legnaro (PD), Italy
  • C. Oliver
    CIEMAT, Madrid, Spain
  
  One of the activities of the EVEDA (Engineering Validation and Engineering Design Activities) phase of the IFMIF (International Fusion Materials Irradiation Facility) project consists in building, testing and operating, in Japan, a 125 mA/9 MeV deuteron accelerator, called LIPAc, which has been developed in Europe. For the accelerator safety aspects, a precise knowledge of beam loss location and power deposition is crucial, especially for a high intensity, high power accelerator like LIPAc. This paper presents the beam dynamics simulations allowing to estimate beam losses in different situations of the accelerator lifetime: starting from scratch, beam commissioning, tuning or exploration, routine operation, sudden failure. Some results of these studies are given and commented. Recommendations for hot point protection, beam stop velocity, beam power limitation are given accordingly.  
slides icon Slides THPP014 [4.780 MB]  
 
THPP030 Status of the Design Study for 10 MHz Post-accelerated Radioactive Ion Beams at HIE-ISOLDE emittance, bunching, linac, ion 901
 
  • M.A. Fraser, R. Calaga
    CERN, Geneva, Switzerland
  
  A ten-fold increase in the bunch spacing of post-accelerated radioactive ion beams has been requested by several research groups at ISOLDE, CERN in order for experiments to use time-of-flight particle identification and background suppression techniques. It is proposed to bunch externally into the existing REX-ISOLDE RFQ at a sub-harmonic frequency of 10.128 MHz to produce the desired 100 ns bunch separation with minimal loss in transmission. The status of a beam dynamics design study carried out to meet this request will be presented in the framework of the HIE-ISOLDE linac upgrade at CERN.  
 
THPP033 Linac4 Transverse and Longitudinal Emittance Reconstruction in the Presence of Space Charge emittance, linac, quadrupole, simulation 913
 
  • J.-B. Lallement, G. Bellodi, V.A. Dimov, A.M. Lombardi, M. Yarmohammadi Satri
    CERN, Geneva, Switzerland
  • M. Yarmohammadi Satri
    IPM, Tehran, Iran
  
  Linac4 is a pulsed, normal-conducting 160 Mev H− linear accelerator presently under construction at CERN. It will replace the present 50 MeV Linac2 as injector of the proton accelerator complex as part of a project to increase the LHC luminosity. The 3 MeV front end, composed of a 45 keV ion source, a Low Energy Beam transport (LEBT), a 352 MHz Radio Frequency Quadrupole (RFQ) at 3 MeV and Medium Energy Beam Transport (MEBT) housing a beam chopper, and the first Drift Tube Linac (DTL) tank at 12 MeV have been commissioned during the first half of 2014. The transverse and longitudinal emittance reconstruction technique in the presence of space charge, that will be used for the next commissioning stages and permanently during the Linac operation, was successfully tested and validated. The reconstruction method and the results obtained at 3 and 12 MeV are presented in this paper.  
 
THPP037 Commissioning and Operational Experience Gained with the Linac4 RFQ at CERN linac, cavity, emittance, ion 926
 
  • C. Rossi, L. Arnaudon, P. Baudrenghien, G. Bellodi, O. Brunner, J. Hansen, J.-B. Lallement, A.M. Lombardi, J. Noirjean
    CERN, Geneva, Switzerland
  • M. Desmons, A. France, O. Piquet
    CEA/DSM/IRFU, France
  
  The installation of Linac4 has started in 2013 with the 3 MeV Front End, aiming at delivering a fully commissioned 160 MeV H− beam by 2016. During summer 2013 the H− ion source, a clone of the first prototype, and the Low Energy Beam Transport lines have been installed in the Linac4 tunnel followed shortly by the 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, which had already been commissioned at the 3 MeV Test Stand, was this time driven by a fully digital LLRF system. This paper reports the result of the bead-pull field check performed after the installation in the tunnel, the experience gained during recommissioning and the results of field characterization as a function of the water temperature in the RFQ cooling channels, showing how the accelerating field can be adjusted by simply tuning the different cavity modules.  
 
THPP040 A Compact High-Frequency RFQ for Medical Applications linac, proton, cavity, quadrupole 935
 
  • M. Vretenar, A. Dallocchio, V.A. Dimov, M. Garlaschè, A. Grudiev, A.M. Lombardi, S.J. Mathot, E. Montesinos, M.A. Timmins
    CERN, Geneva, Switzerland
  
  In the frame of a new program for medical applications, CERN has designed and is presently constructing a compact 750 MHz Radio Frequency Quadrupole to be used as injector for hadron therapy linacs. The RFQ reaches an energy of 5 MeV in only 2 meters; it is divided into four standardized modules of 500 mm, each equipped with 12 tuner ports and one RF input. The inner quadrant radius is 46 mm and the RFQ has an outer diameter of 134 mm; its total weight is only 220 kg. The beam dynamics and RF design have been optimized for reduced length and minimum RF power consumption; construction techniques have been adapted for future industrial production. The multiple RF ports are foreseen for using either 4 solid-state units or 4 IOT’s as RF power sources. Although hadron therapy requires only a low duty cycle, the RFQ has been designed for 5% duty cycle in view of other uses. This extremely compact and economical RFQ design opens several new perspectives for medical applications, in particular for PET isotopes production in hospitals with two coupled high-frequency RFQs reaching 10 MeV and for Technetium production for SPECT tomography with two RFQs followed by a DTL.  
 
THPP042 Error Study on the Normal Conducting ESS Linac emittance, DTL, linac, quadrupole 942
 
  • R. De Prisco, M. Eshraqi, R. Miyamoto, E. Sargsyan
    ESS, Lund, Sweden
  • A.R. Karlsson
    Lund University, Lund, Sweden
  
  One of the preliminary, but important test to evaluate the robustness of the accelerator design is performing the statistical error study by introducing realistic tolerances on the machine components. In this paper the guidelines to define the tolerances and the correction system are summarized in order to validate the design. Firstly statistical studies have been performed in order to define the sensitivity to single errors and to fix the tolerances. Then all errors, within the previous defined tolerances, are applied with the correction system to evaluate the beam quality and to check if the system guarantees a radiologically safe operation.  
 
THPP043 Benchmark of the Beam Dynamics Code DYNAC Using the ESS Proton Linac linac, simulation, space-charge, DTL 945
 
  • E. Tanke, R. De Prisco, M. Eshraqi, R. Miyamoto, A. Ponton, E. Sargsyan
    ESS, Lund, Sweden
  • S. Valero
    CEA, Gif-sur-Yvette, France
  
  The beam dynamics code DYNAC is benchmarked using the ESS Proton Linac. Recent work on improvements in the code, including of the RFQ model, is discussed. The three space charge routines contained in DYNAC, including a 3D version, have remained unchanged. The code contains a numerical method, capable of simulating a multi-charge state ion beam in accelerating elements. In addition, protons, single charge state heavy ions and non-relativistic electrons in accelerating elements can be modeled using an analytical method. The benchmark will include comparisons of both methods with the beam dynamics models in use at ESS: TraceWin and Toutatis. As this analytical method used in DYNAC is fast, it is a prime candidate for use as an online beam simulation tool.  
 
THPP044 ESS Normal Conducting Linac Status and Plans linac, proton, DTL, vacuum 948
 
  • A. Ponton, B. Cheymol, R. De Prisco, M. Eshraqi, R. Miyamoto, E. Sargsyan
    ESS, Lund, Sweden
  • G. Bourdelle, M. Desmons, A. France, O. Piquet, B. Pottin
    CEA/DSM/IRFU, France
  • I. Bustinduy, P.J. González, J.L. Muñoz, I. Rueda, F. Sordo
    ESS Bilbao, Bilbao, Spain
  • L. Celona, S. Gammino, L. Neri
    INFN/LNS, Catania, Italy
  • M. Comunian, F. Grespan, A. Pisent, C. R. Roncolato
    INFN/LNL, Legnaro (PD), Italy
  • P. Mereu
    INFN-Torino, Torino, Italy
  
  The ESS Normal Conducting (NC) linac is composed of an ion source, a Low Energy Beam Transport line, a Radio Frequency Quarupole (RFQ), a Medium Energy Beam Transport Line (MEBT) and a Drift Tube Linac (DTL). It creates, bunches and accelerates the proton beam up to 90 MeV before injecting into the superconducting linac which will deliver a 5 MW beam onto the neutron production target. The construction of the NC linac is part of a broad collaboration involving experts of various Labs in Europe. The technical chalenges and the collaboration strategy for the NC linac will be presented.  
 
THPP045 ESS Linac Beam Modes linac, emittance, quadrupole, DTL 951
 
  • E. Sargsyan, R. Miyamoto
    ESS, Lund, Sweden
  
  The ESS Linac will ultimately deliver 5 MW of beam power to the target with a long-pulse structure of 2.86 ms and 14 Hz repetition rate, which is essential for the production of long-wavelength neutrons [1]. Ten different beam power levels are requested for the operation. In order to preserve the required time structure of the beam, different beam power levels will be produced by reducing the beam current in ten regular steps using an iris with an adjustable aperture in the LEBT. Low current and low emittance beams may as well be useful for the beam commissioning of the Linac. This paper describes the generation and the beam dynamics of different beam modes in the ESS Linac.  
 
THPP049 Design of 162.5 MHz CW Main Coupler for RFQ simulation, cavity, coupling, high-voltage 960
 
  • S. Kazakov, T.N. Khabiboulline, V. Poloubotko, O.V. Pronitchev, J. Steimel, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Project X Injector Experiment (PXIE) at Fermilab will utilize 162.5 MHz CW RFQ accelerating cavity. Design of new main power coupler for PXIE RFQ is reported. Two identical couplers are supposed to deliver approximately 100 kW total CW RF power to RFQ. Unique design of the coupler allows providing DC bias for multipactor suppression. Results of RF and thermal simulations along with mechanical design are presented.  
 
THPP056 Status of the Warm Front End of PXIE kicker, emittance, ion, solenoid 976
 
  • A.V. Shemyakin, M.L. Alvarez, R. Andrews, C.M. Baffes, A.Z. Chen, R.T.P. D'Arcy, B.M. Hanna, L.R. Prost, G.W. Saewert, V.E. Scarpine, J. Steimel, D. Sun
    Fermilab, Batavia, Illinois, USA
  • R.T.P. D'Arcy
    UCL, London, United Kingdom
  • D. Li
    LBNL, Berkeley, California, USA
  
  Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy
A CW-compatible, pulsed H− superconducting linac is envisaged as a possible path for upgrading Fermilab’s injection complex. To validate the concept of the front-end of such machine, a test accelerator (a.k.a. PXIE) is under construction. The warm part of this accelerator comprises a 10 mA DC, 30 keV H− ion source, a 2m-long LEBT, a 2.1 MeV CW RFQ, and a 10-m long MEBT that is capable of creating a large variety of bunch structures. The paper will report commissioning results of a partially assembled LEBT, status of RFQ manufacturing, and describe development of the MEBT, in particular, of elements of its chopping system. 		 
 
THPP067 Status of the SPP RFQ Project ion, ion-source, cavity, diagnostics 1004
 
  • G. Turemen, B. Yasatekin
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • A. Alacakir
    TAEK, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  • H. Yildiz
    Istanbul University, Istanbul, Turkey
  
  The SPP project at TAEA will use 352.2 MHz 4-vane Radio Frequency Quadrupole (RFQ) to accelerate H+ ions from 20 KeV to 1.5 MeV. With the design already complete the project is at the test production phase. To this effect, a so called "cold model" of 50cm length has been produced to validate the design approach, to perform the low power RF tests and to evaluate possible production errors. This paper will report on the current status of the low energy beam transport line (LEBT) and RFQ cavity of the SPP project. It will also discuss the design and manufacturing of the RF power supply and its transmission line. In addition, the test results from some of the LEBT components will be shown and the final RFQ design will be shared.  
poster icon Poster THPP067 [6.947 MB]  
 
THPP069 Status and Outlook of the 325 MHz 4-Rod RFQ dipole, simulation, HOM, impedance 1010
 
  • B. Koubek, H. Podlech, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main, Germany
  
  In order to built a Radio Frequency Quadrupole (RFQ) at 325 MHz for the FAIR proton linac, a 4-rod structure has been investigated. The RF design, especially the dipole and fringe fields and higher order modes, has been studied with simulations. A prototype has been built and power tested to verify the simulation results and investigate the high power performance. This paper summarizes the results of the research concerning the 325 MHz 4-rod RFQ and gives an overview about the next steps in this project.  
 
THPP070 Alternative Compact LEBT Design for the FAIR Injector Upgrade ion, focusing, space-charge, emittance 1013
 
  • K. Schulte, M. Droba, S. Klaproth, O. Meusel, D. Noll, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • S.G. Yaramyshev
    GSI, Darmstadt, Germany
  
  In order to provide high intensity and brightness of the uranium beam for the planned FAIR project, the existing High Current Injector (HSI) at GSI has to be upgraded*. A part of the upgrade program is the design and construction of a compact straight injection line into the 36 MHz Radio Frequency Quadrupole of the HSI. As an alternative to a conventional LEBT design consisting of magnetic systems such as solenoids or quadrupoles, the application of Gabor lenses has been investigated. The focusing force of the Gabor lens is created by the space charge of an electron cloud, confined by crossed magnetic and electric fields inside the lens volume. Therefore, the Gabor lens combines strong, electrostatic focusing with simultaneous space-charge compensation. In previously performed beam transport experiments at GSI a prototype Gabor lens has been tested successfully. Furthermore, the operation and performance of such a device in a real accelerator environment has been studied. In this contribution an alternative LEBT design will be discussed and an improved Gabor lens design will be presented.
*W. Barth et al., “HSI-Frontend Upgrade”, GSI Scientific Report, 2009 		 
 
THPP071 Proposal of a 325 MHz Ladder-RFQ for the FAIR Proton-Linac proton, simulation, dipole, quadrupole 1016
 
  • M. Schütt, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • R. M. Brodhage
    GSI, Darmstadt, Germany
  
  Funding: BMBF 05P12RFRB9
For the research program with cooled antiprotons at FAIR a dedicated 70 MeV, 70 mA proton injector is required. The first rf accelerator element is a 325 MHz RFQ accelerating from 95 keV to 3.0 MeV. RFQ’s beyond 300 MHz were realized in 4-Vane-type geometry so far. At IAP there is a tradition in 4-Rod-type RFQ development. This type of RFQ is dominating at lower frequencies. Very promising results have been reached with a ladder type-RFQ, which has been investigated during 2013. In comparison with a traditional 4-Rod RFQ approach the geometry is more convenient at high frequencies. We will show most recent 3D simulations of the frequency tuning possibilities and of a whole cavity demonstrating the power of a ladder type RFQ. An RFQ layout for the new FAIR proton injector will be shown. (see also R. Brodhage, U. Ratzinger, A. Almomani, “Design Study of a High Frequency Proton Ladder RFQ” , Proc. of the 2013 IPAC Conference, Shanghai, China, p. 3788.) 		 
 
THPP090 Longitudinal Measurement of Annular-Ring Coupled Structure Linac in J-PARC injection, simulation, linac, distributed 1056
 
  • T. Maruta, Y. Liu
    KEK/JAEA, Ibaraki-Ken, Japan
  • A. Miura
    JAEA/J-PARC, Tokai-mura, Japan
  
  In the J-PARC linac, Annular-type Coupled Structure (ACS) linac was introduced for the beam energy extension to 400 MeV in year 2013. To measure the longitudinal property of the ACS, we measured acceptance in phase direction by synchronous phase scan method and confirm that the acceptance is consistent with that by 3D PIC simulation. Simultaneously, the output beam energy from ACS was measured by orbit displacement where the dispersion is large. In this presentation, we discuss the measurement method and results.  
 
THPP094 The Heavy Ion Injector at the NICA Project ion, heavy-ion, linac, ion-source 1068
 
  • A.V. Butenko, D.E. Donets, E.E. Donets, A.D. Kovalenko, A.O. Sidorin, A. Tuzikov
    JINR/VBLHEP, Moscow, Russia
  • V. Aleksandrov, E.D. Donets, A. Govorov, V. Kobets, K.A. Levterov, I.N. Meshkov, V.A. Mikhaylov, V. Monchinsky, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  • H. Hoeltermann, H. Podlech, U. Ratzinger, A. Schempp
    BEVATECH, Frankfurt, Germany
  • T. Kulevoy, D.A. Liakin
    ITEP, Moscow, Russia
  
  The general goals of the Nuclotron-based Ion Collider fAcility (NICA) project at JINR (Dubna) are providing of colliding beams for experimental studies of both hot and dense strongly interacting baryonic matter and spin physics. The experiments will be performed in collider mode and at fixed target. The first part of the project program requires the collisions of heavy nuclei up to 197Au79+ to be studied. The new heavy ion linac – HILac (Heavy Ion Linear Accelerator) will accelerate ions with q/A – values above 0.16 to 3.2 MeV/u is under manufacturing presently. The main features of HILac are described.  
 
THPP097 3D Effects in RFQ Accelerators simulation, quadrupole, cavity, emittance 1077
 
  • S.S. Kurennoy
    LANL, Los Alamos, New Mexico, USA
  
  RFQ accelerators are usually designed and modeled with standard codes based on electrostatic approximations. Recent examples show that this approach fails to accurately predict the performance for 4-rod RFQs: 3D RF effects near the vane ends can noticeably influence the beam dynamics. The same applies to any RFQ where the quadrupole symmetry is broken, e.g., 4-vane RFQ with windows. We analyzed two 201.25-MHz 4-rod RFQs – one recently commissioned at FNAL and a new design for LANL – using 3D modeling with CST Studio. In both cases the manufacturer CAD RFQ model was imported into CST. The electromagnetic analysis with MicroWave Studio (MWS) was followed by beam dynamics modeling with Particle Studio (PS). For the LANL RFQ with duty factor up to 15%, a thermal-stress analysis with ANSYS was also performed. The simulation results for FNAL RFQ helped our Fermilab colleagues fix the low output beam energy. The LANL RFQ design was modified after CST simulations indicated insufficient tuning range and incorrect output energy; the modified version satisfies the design requirements.  
 
THPP105 Beam Dynamics Simulation for the 1 GeV High Power Proton Linac linac, focusing, proton, simulation 1099
 
  • S.M. Polozov, V.S. Dyubkov, T. Kulevoy, A.V. Samoshin
    MEPhI, Moscow, Russia
  • G. Kropachev, T. Kulevoy
    ITEP, Moscow, Russia
  
  Funding: This work is supported in part by the Ministry of Science and Education of Russian Federation under contract No. 14.516.11.0084
The design of high energy and high power proton linacs for accelerating driven systems (ADS) is one of the accelerator technology frontiers. Such linacs are under developing in EU, Japan, PRC but not discussed in Russia previous fifteen years. The driver linac and the breeder conceptual designs were funded by the Ministry of Science and Education of Russian Federation in 2013. The 2 MeV RFQ linac was proposed as the first accelerating section. A number of RF focusing sections types (by RF crossed lenses, modified electrode profile RFQ, axi-symmetrical RF focusing) were discussed for medium energies. The conventional modular scheme linac based on spoke-cavities and 5-cell elliptical cavities was designed for higher energies. The results of beam dynamics simulation in this linac will present. 		 
 
THPP108 Status of New 2.5 MeV Test Facility at SNS ion, ion-source, operation, neutron 1105
 
  • A.V. Aleksandrov, M.S. Champion, M.T. Crofford, Y.W. Kang, A.A. Menshov, R.T. Roseberry, M.P. Stockli, A. Webster, R.F. Welton, A.P. Zhukov
    ORNL, Oak Ridge, Tennessee, USA
  • K. Ewald
    Fermilab, Batavia, Illinois, USA
  • M.E. Middendorf, S.N. Murray, R.B. Saethre
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: Oak Ridge National Laboratory is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy
A new 2.5Mev beam test facility is being built at SNS. It consists of a 65 keV H− ion source, a 2.5MeV RFQ, a beam line with various beam diagnostics and a 6 kW beam dump. The facility is capable of producing one-ms-long pulses at 60Hz repetition rate with up to 50mA peak current. Commissioning with reduced average beam power is planned for fall 2014 to verify operation of all systems. The full power operation is scheduled to begin in 2015. Status of the facilty will be presented as well as discussion of the future R&D program. 		 
 
THPP137 Present Status of the 3 MeV Proton Linac at Tsinghua University linac, proton, status, target 1182
 
  • Q.Z. Xing, C. Cheng, C.T. Du, L. Du, T. Du, X. Guan, C. Jiang, C.-X. Tang, X.W. Wang, H.Y. Zhang, S.X. Zheng
    TUB, Beijing, People's Republic of China
  • W.Q. Guan, Y. He, J. Li
    NUCTECH, Beijing, People's Republic of China
  • B.C. Wang
    NINT, Xi'an, People's Republic of China
  
  We present, in this paper, the present status of the 3 MeV high current proton Linac for the Compact Pulsed Hadron Source (CPHS) at Tsinghua University. The ECR ion source produces 50 keV proton beam which is accelerated to 3 MeV by the downstream RFQ accelerator. The RFQ accelerator has been conditioned to 50 Hz/500 μs with the input power of 442 kW. Proton beam with the peak current of 30 mA, pulse length of 100 μs and repetition rate of 50 Hz has been delivered to the Beryllium target to produce the neutron since July 2013. The status of the development of the Drift Tube Linac is also presented in this paper. The beam energy will be enhanced to 13 MeV after the DTL is ready in 2015.