Keyword: LEBT
Paper Title Other Keywords Page
MOPTS006 Final Results of the SPIRAL2 Injector Commissioning rfq, emittance, MMI, linac 848
 
  • R. Ferdinand, M. Di Giacomo, H. Franberg, J.-M. Lagniel, G. Normand, A. Savalle
    GANIL, Caen, France
  • D. Uriot
    CEA-DRF-IRFU, France
  
  The SPIRAL2 injector, made up of a 5 mA p-d ion source, a 1 mA heavy ion source (up to A/Q = 3) and a CW 0.75 MeV/u RFQ, has been commissioned in parallel with the superconducting linac installation. This com-missioning is successfully completed now and the Diag-nostic plate (D-plate) used to characterize the injector beams is removed. This paper presents the results ob-tained with the reference particles (H+, 4He2+, 18O6+ and 40Ar14+) and a comparison with the simulations. The connexion to the SC linac and the future linac beam commissioning is briefly described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS006  
About • paper received ※ 12 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPTS032 New Beam Dynamics Simulations for the FAIR p-Linac RFQ rfq, simulation, linac, emittance 921
 
  • M. Syha, H. Hähnel, U. Ratzinger, M. Schuett
    IAP, Frankfurt am Main, Germany
  
  The construction of a 3.3m Ladder-RFQ at IAP*, Goethe University Frankfurt, has been finished successfully last summer. This RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the p-Linac at FAIR**. Along the acceleration section the parameters modulation, aperture and synchronous phase are varied linearly with cell number, which differs from former designs from IAP Frankfurt. The ratio of transversal vane curvature radius to mid-cell radial aperture and the vane radius itself are constant. The development of an adequate beam dynamics design was done with the aid of the RFQGen-code and in close collaboration with the IAP resonator design team. The RFQ beam dynamics design could be successfully reproduced with the TOUTATIS-routine of CEAs*** TraceWin-code. Several new beam dynamics simulations were performed on the design. Among these were current and Twiss parameter studies as well as simulations concerned with the investigation of longitudinal entrance and exit gap field effects. Others were based on new measurements in the LEBT-line performed by the GSI**** Ion Source Group in April 2019. In the near future, further LEBT measurements and subsequent simulations (among other to design a well-fitting cone for the RFQ), as well as mechanical error studies in TOUTATIS, will follow.
*Institute of Applied Physics
**Facility for Antiproton and Ion Research
***French Alternative Energies and Atomic Energy Commission
****GSI Helmholtz Centre for Heavy Ion Research 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS032  
About • paper received ※ 14 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPTS083 Beam Dynamics Simulation with an Updated Model for the ESS Ion Source and Low Energy Beam Transport rfq, solenoid, emittance, simulation 1042
 
  • E. Nilsson, M. Eshraqi, J.F. Esteban Müller, Y. Levinsen, N. Milas, R. Miyamoto
    ESS, Lund, Sweden
  
  Beam dynamics simulation of the ion source (IS) and low energy beam transport (LEBT) of the European Spallation Source (ESS) Linac is conducted with TraceWin and IBSimu code. TraceWin allows multi-particle tracking based on a particle-in-cell space-charge solver and is the standard simulation tool of the whole ESS Linac. IBSimu is based on a Vlasov solver and allows to simulate beam extraction from plasma as well as the beam transport in the LEBT. In preparation for beam commissioning of the IS and LEBT in the ESS Linac tunnel, which started in September 2018 and is ongoing as of the timing of writing this paper, the simulation models of the IS and LEBT in these two codes were updated. This paper reports the effort for these updates, including the beam distribution out of the IS, electromagnetic field map of the LEBT solenoid, more realistic aperture structure in the LEBT, as well as updated LEBT solenoids scan simulation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS083  
About • paper received ※ 17 May 2019       paper accepted ※ 18 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPTS084 ESS Low Energy Beam Transport Tuning During the First Beam Commissioning Stage solenoid, MMI, emittance, rfq 1046
 
  • R. Miyamoto, C.S. Derrez, E. Laface, Y. Levinsen, N. Milas, A.G. Sosa, R. Tarkeshian, C.A. Thomas
    ESS, Lund, Sweden
  
  Beam commissioning of the ion source (IS) and low energy beam transport (LEBT) of the European Spallation Source is ongoing on its site as of writing this paper and continues until June 2019. The LEBT consists of two solenoids with integrated dipole correctors to steer, focus, and match the high current divergent beam out of the IS to the following radio frequency quadrupole (RFQ). It is also equipped with a suite of diagnostics devices to provide a full characterization of the beam for achieving a good transport within the LEBT, optimizing the matching to the RFQ, and also providing references to numerical simulations. This paper presents results of beam characterization campaign from the ongoing beam commissioning period, including the matching at the RFQ interface based on emittance sampling for varied strengths of the solenoids and verification of the linear model for the trajectory and beam envelope.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS084  
About • paper received ※ 21 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPTS103 First Results of Beam Commissioning on the ESS Site for the Ion Source and Low Energy Beam Transport MMI, solenoid, site, ion-source 1118
 
  • R. Miyamoto, R.E. Bebb, E.C. Bergman, B. Bertrand, H. Danared, C.S. Derrez, E.M. Donegani, M. Eshraqi, J.F. Esteban Müller, T. Fay, V. Grishin, B. Gålnander, S. Haghtalab, H. Hassanzadegan, A. Jansson, H. Kocevar, E. Laface, Y. Levinsen, M. Mansouri, C.A. Martins, J.P.S. Martins, N. Milas, M. Muñoz, E. Nilsson, D.C. Plostinar, C. Rosati, T.J. Shea, A.G. Sosa, R. Tarkeshian, L. Tchelidze, C.A. Thomas, P.L. van Velze
    ESS, Lund, Sweden
  • I. Bergstrom
    CERN, Meyrin, Switzerland
  • L. Celona, L. Neri
    INFN/LNS, Catania, Italy
  
  The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a spallation neutron source driven by a proton linac of an unprecedented 5 MW beam power. Such a high power requires its ion source (IS) to produce proton beam pulses at 14 Hz with a high peak current more than 62.5 mA and a long plateau up to §I{3}{ms}. The IS and the following low energy beam transport (LEBT) section were manufactured and tested with beam to meet ESS requirements at INFN-LNS and delivered to ESS towards the end of 2017. Beam commissioning of these two sections on the ESS site has started in September 2018 and will continue until the end of June 2019. This paper provides an overview on this first beam commissioning period at ESS and also presents results of IS characterization and testing on LEBT functionalities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS103  
About • paper received ※ 20 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPTS009 Operating the SNS RF H− Ion Source with a 10% Duty Factor ion-source, plasma, electron, neutron 1951
 
  • M.P. Stockli, M.E. Clemmer, S.M. Cousineau, B. Han, T.A. Justice, Y.W. Kang, S.N. Murray, T.R. Pennisi, C. Piller, R.F. Welton
    ORNL, Oak Ridge, Tennessee, USA
  • I.N. Draganic, R.W. Garnett, D. Kleinjan, G. Rouleau
    LANL, Los Alamos, New Mexico, USA
  • V.G. Dudnikov
    Muons, Inc, Illinois, USA
  • C. Stinson
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: This work was performed at Oak Ridge National Laboratory under contract DE-AC05-00OR22725 and at Los Alamos National Laboratory under contract DE-AC52-06NA25396 for the U.S. Department of Energy.
The SNS (Spallation Neutron Source) (radio-frequency) RF-driven, H− ion source injects ~50 mA of H− beam into the SNS accelerator at 60 Hz with a 6% duty factor. It injects up to 7 A·hrs of H− ions during its ~14-week service cycles, which is an unprecedented lifetime for small-emittance, high-current pulsed H− ion sources. The SNS source also features unprecedented low cesium consumption and can be installed and started up in <10 h. Presently, the LANSCE (Los Alamos Neutron Science CEnter) accelerator complex in Los Alamos is fed by a filament-driven, biased converter-type H− source that operates with a high plasma duty factor of 10%. It needs to be replaced every 4 weeks with a ~4 day startup phase. The measured negative beam current of 16-18 mA falls below the desired 21 mA acceptance of LANSCE’s accelerator especially since the beam contains several mA of electrons. LANSCE and SNS are exploring the possibility of using the SNS RF H− source at LANSCE to increase the H− beam current and the ion source lifetime while decreasing the startup time. For this purpose, the SNS H− source has been tested at a 10% duty factor by operating it at 120 Hz with 840 µs plasma pulses generated with ~30 kW of 2 MHz RF power, and extracting ~25 mA around-the-clock for 28 days. This, and additional tests and other considerations are discussed in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS009  
About • paper received ※ 14 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPTS038 The Operation Status of CSNS Front End rfq, ion-source, emittance, operation 2024
 
  • Y.W. An, Y.J. Lv, H.F. Ouyang, Y.C. Xiao
    IHEP, Beijing, People’s Republic of China
  • X. Cao, W. Chen, T. Huang, H. Li, S. Liu, K. Xue
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Funding: Work supported by National Natural Science Foundation of China(11875271)
China spallation neutron source (CSNS), as the China’s first 100kW beam power pulsed neutron source, its operation target beam power is now larger than 50kW. During the beam power upgrading process of CSNS to 50kW from 2018 to 2019, many improvements have been made for the front end of CSNS. In this paper, the commissioning and improvement of front end as well as the laboratory construction are introduced. The improvements mainly focus on solving the stability of ion source and the spark of Radio Frequncy quadrupole (RFQ) caused by the pre-chopped beam into RFQ. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS038  
About • paper received ※ 08 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPTS051 Recent Beam Commissioning of LEAF at IMP rfq, MMI, operation, acceleration 2043
 
  • Y. Yang, Y.H. Guo, L. Lu, L.B. Shi, L.T. Sun, L.P. Sun, X.B. Xu, Y.H. Zhai, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  
  LEAF (Low Energy intense-highly-charged ion Accelerator Facility) has been successfully commissioned with several beams in CW regime, covering the M/Q from 2 to 7, such as H2+, He2+, C4+, O4+, He+, Kr13+, N2+ et al. This paper presents recent beam commissioning results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS051  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPTS071 H+ and H− Ion Beam Injectors at LANSCE: Beam Production Status and Planned Injector Upgrades ion-source, plasma, cathode, proton 2087
 
  • I.N. Draganic, D. Kleinjan, G. Rouleau
    LANL, Los Alamos, New Mexico, USA
  
  The Los Alamos Neutron Science Center operates with two 750 keV Cockcroft-Walton accelerators for simultaneous injection of H+ and H− ion beams into a 800 MeV linear accelerator. The proton ion beam is produced using a duoplasmatron source and the H− ion beam is formed with a cesiated, multi-cusp-field, surface converter ion source. An overview of ion injector status, recent low energy beam transport line optimizations and ion source performance improvements will be presented. To reduce long term operational risks and to improve existing LANSCE beam production for all facility users, new injector upgrades are underway: 1) replacing the H+ CW injector with a Radio-Frequency Quadruple accelerator and 2) increasing H− ion beam brightness and extending source lifetime using the novel SNS RF negative ion source. The status of upgrade projects will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS071  
About • paper received ※ 14 May 2019       paper accepted ※ 21 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPMP020 First Beam Transmission Measurements in Ion Source and LEBT at the European Spallation Source ion-source, proton, solenoid, MMI 2353
 
  • E. Laface
    ESS, Lund, Sweden
  
  The Ion Source and the Low Energy Beam Transport (LEBT) have been installed in the European Spallation Source tunnel, in Lund, Sweden, during the summer 2018. The first proton beam was extracted on September. In this paper we present the first set of measurements of protons transmission in combination with the analysis of the species (H+, H+2, H+3) extracted by the source. We show that our measurements are compatible with a fraction of 80\% of protons transported along the LEBT, as measured at the INFN-LNS, Catania, Italy during the commissioning in 2016-17. [1]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP020  
About • paper received ※ 12 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPGW004 Wire Scanner for High Intensity Ion Beam* quadrupole, focusing, electron, vacuum 2466
 
  • A. Beller, D. Bondoux, F. Bouly
    LPSC, Grenoble Cedex, France
  
  Funding: Part of this work supported by the European Atomic Energy Community (EURATOM) H2020 Program under grant agreement n°662186 (MYRTE project).
The goal of the project is to develop a Wire-Scanner compatible with low energy - high intensity ion beams and adaptable to various beam chamber diameters. The purpose is to obtain the 2D beam profile by passing measurement wires through the beam. Thanks to a high speed passage of measurement wires, it allows to avoid "disrupting" the beam passage, and can be considered as a non-destructive diagnosis. Wires heating and measuring issues have been solved by using tungsten wires kept in tension by a mechanical system. All driving and signal measurements are performed by a PXI based system. The synchronization of the measurements is guaranteed by an analog input board recovering the wires current and the translator position, the latter being carried out by a laser sensor. Besides this technological aspect, an optimization algorithm for beam profile reconstruction from measured data under Gaussian hypothesis has been developed. The standalone system and first experimental results are presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW004  
About • paper received ※ 13 May 2019       paper accepted ※ 18 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPGW076 Initial Performance of the Beam Instrumentation for the ESS IS & LEBT MMI, emittance, ion-source, diagnostics 2650
 
  • C.S. Derrez, R.A. Baron, R.E. Bebb, E.C. Bergman, I. Dolenc Kittelmann, E.M. Donegani, T. Fay, T.J. Grandsaert, V. Grishin, S. Haghtalab, H. Hassanzadegan, A. Jansson, H. Kocevar, E. Laface, Ø. Midttun, R. Miyamoto, J. Norin, K.E. Rosengren, T.J. Shea, A.G. Sosa, R. Tarkeshian, L. Tchelidze, C.A. Thomas, P.L. van Velze
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is currently under construction in Lund (Sweden), and its 5 MW of average beam power at repetition rate of 14 Hz will make it five times more powerful than other pulsed neutron-scattering facilities. High-energy neutrons will be produced via spallation by 2 GeV protons on a tungsten target. A complete suite of beam diagnostics will enable tuning, monitoring and protection of the proton accelerator during commissioning, studies and operation. As an initial step toward neutron production, the Ion Source (ISrc) and the 75keV Low Energy Beam Transport Line (LEBT) have been installed. For the commissioning and characterization of this first beam-producing system, a subset of the ISrc and LEBT diagnostics suite has been deployed. This includes the following equipment: a Faraday cup, beam current transformers, an Allison Scanner emittance measurement unit, beam-induced fluorescence monitors, and a Doppler-shift spectroscopy system. Beam instrumentation deployment and performance verification, as well as the operational experience during the initial beam commissioning, will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW076  
About • paper received ※ 17 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPTS006 Modelization of an Injector With Machine Learning network, rfq, solenoid, proton 3096
 
  • M. Debongnie, M.A. Baylac, F. Bouly
    LPSC, Grenoble Cedex, France
  • N. Chauvin, D. Uriot
    CEA-IRFU, Gif-sur-Yvette, France
  • A. Gatera
    SCK•CEN, Mol, Belgium
  • T. Junquera
    Accelerators and Cryogenic Systems, Orsay, France
  
  Modern particle accelerator projects, such as MYRRHA, have very high stability and/or reliability requirements. To meet those, it is necessary to optimize or develop new methods for the control systems. One of the difficulties lies in the relatively long computation time of current beam dynamics codes. In this context, the very low computation time of neural network is of great attraction. However, a neural network has to be trained in order to be of any use. The training of a beam dynamic predictor uses a large dataset (experimental or simulated) that represents the dynamics over the parameter space of interest. Therefore, choosing the right training dataset is crucial for the quality of the neural network predictions. In this work, a study on the sampling choice for the training data is performed to train a neural network to predict the transmission of a beam through a low energy beam transport line and a Radiofrequency Quadrupole. We show and discuss the results obtained on training data set to model the IPHI and MYRRHA injectors.
https://myrrha.be/ 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS006  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPTS037 DC Beam Space-Charge Modeling for OpenXAL simulation, space-charge, solenoid, GUI 3177
 
  • B.E. Bolling, N. Milas
    ESS, Lund, Sweden
  
  OpenXAL is an open source multi-purpose accelerator physics software platform based on a pure Java open source development environment used for creating accelerator physics applications, scripts and services. Currently, the software has been used with an ellipsoidal (bunched) beam to account for space-charge effects. Applications developed so far for ESS, such as the Virtual Machine for the ESS Low Energy Beam Transport (LEBT) section, would profit from a DC beam description. In this paper, the space-charge component for a continuous beam is derived taking into account beams with different transverse charge distributions (uniform, gaussian, etc). The implementation in OpenXAL and a comparison with other simulation codes is also presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS037  
About • paper received ※ 14 May 2019       paper accepted ※ 20 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPTS096 Open XAL Status Report 2019 cavity, linac, framework, status 3341
 
  • A.P. Zhukov, C.K. Allen, A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
  • B.E. Bolling, J.F. Esteban Müller, E. Laface, Y. Levinsen, N. Milas, C. Rosati
    ESS, Lund, Sweden
  • C.P. Chu, Y. Li
    IHEP, Beijing, People’s Republic of China
  • T. Dodson
    University of Tennessee, Knoxville, USA
  • P. Gillette, P. Laurent, G. Normand, A. Savalle
    GANIL, Caen, France
  • M.T. Li, X.H. Lu, J. Peng
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  The Open XAL accelerator physics software platform is being developed through an international collaboration among several facilities since 2010. This paper discusses progress in beam dynamics simulation, new RF models, and updated application framework along with new generic accelerator physics applications. We present the current status of the project, a roadmap for continued development and an overview of the project status at each participating facility.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS096  
About • paper received ※ 15 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)