Keyword: dipole
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MOPRC008 Dispersion Free and Dispersion Target Steering Experience at CTF3 linac, optics, target, quadrupole 83
 
  • D. Gamba, R. Corsini, T. Persson, P.K. Skowroński, F. Tecker
    CERN, Geneva, Switzerland
  • P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • P. Burrows
    JAI, Oxford, United Kingdom
 
  One of the goals of the CLIC Test Facility (CTF3) at CERN is to demonstrate the feasibility of the CLIC Drive Beam recombination, which takes place in the Drive Beam Recombination Complex (DBRC). The tight geometry of the DBRC together with its strong optics and the high energy-spread of the beam require a careful control of the beam size along the different sections of the DBRC. One of the main contribution to beam size is the dispersion. If uncontrolled, dispersion leads to fast increase of the beam size, hence it may affect the beam current stability of the combined beam. A tool has been implemented at CTF3 to measure and correct dispersion during and after the setup of the machine. Dispersion Free Steering (DFS) has been applied in the upstream drive beam LINAC, while Dispersion Target Steering (DTS) has been used in the rings of the DBRC. In the LINAC the weak optics and the wide dynamic aperture of the beamline allow a straightforward correction. In the DBRC the aperture is tighter, and the strong optics produce non-linear dispersion which one needs to take into account. A general overview of current status and future plans in controlling dispersion at CTF3 will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC008  
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MOPRC019 Beam Dynamic of Transport Line 1+ with New HRMS for the SPES Project simulation, ion, beam-transport, beam-losses 114
 
  • E. Khabibullina
    MEPhI, Moscow, Russia
  • L. Bellan, M. Comunian, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • E. Khabibullina
    ITEP, Moscow, Russia
  • A.D. Russo
    INFN/LNS, Catania, Italy
 
  SPES (Selective Production of Exotic Species) is integrated Italian facility in LNL (Laboratori Nazionali di Legnaro, Legnaro, Italy) for production of high-intensity and highly charged beams of neutron-rich nuclei for Advanced Studies. The facility is based on 35-70MeV proton cyclotron, an ISOL fission target station and the existing ALPI superconducting accelerator as the post accelerator. In this paper the results of beam dynamic simulation of 132Sn ion beam transport line from Beam Cooler to the Charge Breeder, including HRMS (High Resolution Mass Separator) with mass resolution 1/20000 and electrostatic dipoles are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC019  
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MOPLR007 Redesign of the End Group in the 3.9 GHz LCLS-II Cavity HOM, cavity, linac, operation 145
 
  • A. Lunin, I.V. Gonin, T.N. Khabiboulline, N. Solyak
    Fermilab, Batavia, Illinois, USA
 
  Funding: Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the U.S. DOE
Development and production of Linac Coherent Light Source II (LCLS-II) is underway. The central part of LCLS-II is a continuous wave superconducting RF (CW SCRF) electron linac. The 3.9 GHz third harmonic cavity similar to the XFEL design will be used in LCLS-II for linearizing the longitudinal beam profile*. The initial design of the 3.9 GHz cavity developed for XFEL project has a large, 40 mm, beam pipe aperture for better higher-order mode (HOM) damping. It is resulted in dipole HOMs with frequencies nearby the operating mode, which causes difficulties with HOM coupler notch filter tuning. The CW linac operation requires an extra caution in the design of the HOM coupler in order to prevent its possible overheating. In this paper we present the modified 3.9 GHz cavity End Group for meeting the LCLS-II requirements
* LCLS-II 3.9 GHz Cryomodules, Physics Requirements Document, LCLSII-4.1-PR-0097-R1, SLAC, USA, 2015
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR007  
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MOPLR014 Construction of a Third Recirculation for the S-DALINAC* linac, recirculation, operation, simulation 168
 
  • M. Arnold, T. Kürzeder, J. Pforr, N. Pietralla, M. Steinhorst
    TU Darmstadt, Darmstadt, Germany
  • F. Hug
    IKP, Mainz, Germany
 
  Funding: * Work supported by DFG through CRC 634 and RTG 2128
Since 1991 the superconducting recirculating electron accelerator S-DALINAC is running at TU Darmstadt. Its designated design energy of 130 MeV wasn't reached yet due to a lower quality factor of the 3 GHz cavities and thus a higher dissipated power to the helium bath. To increase the maximum achievable energy in cw operation from approx. 85 MeV to the design value of 130 MeV the main accelerator will be passed a fourth time. In this configuration the accelerating gradients of the cavities can be lowered, so that the resulting dissipated power will match the available cooling power of the cryo plant. To realize an additional main linac pass a new recirculation beam line is needed. The most crucial points are the design of the separation dipole and its mirrored version as well as a properly calculated lattice. For the implementation of a new recirculation beam line the existing sections must be adapted to fit the new boundary conditions. This contribution will present some aspects of the design and will report on the actual status of this project.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR014  
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MOPLR030 Electromagnetic Design of a Superconducting Twin Axis Cavity cavity, HOM, coupling, linac 203
 
  • S.U. De Silva, J.R. Delayen, H. Park
    ODU, Norfolk, Virginia, USA
  • A. Hutton, F. Marhauser, H. Park
    JLab, Newport News, Virginia, USA
 
  The twin-axis cavity is a new kind of rf superconducting cavity that consists of two parallel beam pipes, which can accelerate or decelerate two spatially separated beams in the same cavity. This configuration is particularly effective for high-current beams with low-energy electrons that will be used for bunched beam cooling of high-energy protons or ions. The new cavity geometry was designed to create a uniform accelerating or decelerating fields for both beams by utilizing a TM110 dipole mode. This paper presents the design rf optimization of a 1497 MHz twin-axis single-cell cavity, which is currently under fabrication.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR030  
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MOPLR031 Wakefield Analysis of Superconducting RF-Dipole Cavities wakefield, cavity, impedance, HOM 206
 
  • S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
 
  RF-dipole crabbing cavities are being considered for a variety of crabbing applications. Some of the applications are the crabbing cavity systems for LHC High Luminosity Upgrade and the proposed Electron-Ion Collider for Jefferson Lab. The design requirements in the current applications require the cavities to incorporate complex damping schemes to suppress the higher order modes that may be excited by the high intensity proton or electron beams traversing through the cavities. The number of cavities required to achieve the desired high transverse voltage, and the complexity in the cavity geometries also contributes to the wakefields generated by beams. This paper characterizes the wakefield analysis for single cell and multi-cell rf-dipole cavities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR031  
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MOPLR049 Design of a 750 MHz IH Structure for Medical Applications rfq, DTL, linac, proton 240
 
  • S. Benedetti, A. Grudiev, A. Latina
    CERN, Geneva, Switzerland
 
  Low velocity particles are critical in every hadron accelerator chain. While RFQs nicely cover the first MeV/u range, providing both acceleration and bunching, energies higher than few MeV/u require different structures, depending on the specific application. In the framework of the TULIP project [1], a 750 MHz IH structure was designed, in order to cover the 5-10 MeV/u range. The relatively high operating frequency and small bore aperture radius led the choice towards TE mode structures over more classic DTLs. Hereafter, the RF regular cell and end cell optimization is presented. An innovative solution to compensate dipole kicks is discussed, together with the beam dynamics and the matching with the 5 MeV 750 MHz CERN RFQ [2]. This structure was specifically designed for medical applications with a duty cycle of about 1 ', but can easily adapted to duty cycles up to 5 %, typical of PET isotopes production in hospitals.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR049  
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MOPLR063 Development of H0 Beam Diagnostic Line in MEBT2 of J-PARC Linac linac, diagnostics, vacuum, experiment 277
 
  • J. Tamura, A. Miura, T. Morishita
    JAEA/J-PARC, Tokai-mura, Japan
  • H. Ao
    FRIB, East Lansing, USA
  • T. Maruta
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
 
  In the Japan Proton Accelerator Research Complex (J-PARC) linac, H0 particles arising from collisions of accelerated H beams with residual gas are considered as one of the key factors of the residual radiation in the high energy accelerating section. To analyze the H0 and the accelerated H particles, the bump magnet system was designed and produced. The H0 beam diagnostic line consists of four horizontal bending magnets, non-destructive beam position monitor and wire scan beam profile monitor. In the 2015 summer maintenance period of the J-PARC, the new diagnostic line was constructed in the beam transport (MEBT2), which is the matching section from separated-type drift tube linac (SDTL) to annular-ring coupled structure linac (ACS). In the beam commissioning, we experimentally confirmed that the accelerated 190 MeV H beams are horizontally shifted as expected with the magnetostatic field simulation and the particle tracking simulation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR063  
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MOP106002 X-Band Photonic Band Gap Accelerating Structures with Improved Wakefield Suppression wakefield, HOM, acceleration, electron 307
 
  • E.I. Simakov
    LANL, Los Alamos, New Mexico, USA
 
  Funding: This work is supported by U.S. Department of Energy (DOE) Office of High Energy Physics.
We present the design of a novel photonic band gap (PBG) accelerating structure with elliptical rods and improved wakefields suppression. It has been long recognized that PBG structures have great potential in reducing long-range wakefields in accelerators. The first ever demonstration of acceleration in room-temperature PBG structures was conducted at MIT in 2005. The experimental characterization of the wakefield spectrum in a beam test was performed at Argonne Wakefield Accelerator facility in 2015, and the superior wakefield suppression properties of the PBG structure were demonstrated. In 2013 the team from MIT and SLAC demonstrated that the X-band PBG structures with elliptical rods have reduced breakdown rate compared to PBG structures with round rods, presumably due to the reduced surface magnetic fields. However, the structure with elliptical rods designed by MIT confined the dipole higher order mode in addition to the accelerating mode and thus did not have superior wakefield suppression properties. We demonstrate that PBG resonators can be designed with 40% smaller peak surface magnetic fields while preserving and even improving their wakefield suppression properties as compared to the structure with round rods. The design of the new structure is presented. The structure will be fabricated, tuned, and tested for high gradients and for wakefield suppression.
 
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TUPRC010 Multispecies Simulation of the FRIB Frontend Near the ECR Sources with the Warp Code simulation, ECR, space-charge, solenoid 434
 
  • K. Fukushima, S.M. Lund
    FRIB, East Lansing, USA
  • C.Y. Wong
    NSCL, East Lansing, Michigan, USA
 
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511.
The linear accelerator in the Facility for Rare Isotope Beams (FRIB) will use Electron Cyclotron Resonance (ECR) sources. ECR sources can generate a high-brightness DC beam with high charge states. However, the ECR sources produce numerous species that must be collimated to one or two target species with minimal degradation to beam quality. The first stage of this collimation is accomplished in a tight 90 degree dipole bend with a wide aperture and slanted pole faces to provide additional focusing. We report on simulations for the high-rigidity U ion operation using linked 2D xy-slice runs in the straight section upstream of the bend and steady-state 3D simulations in the dipole bend comparing simulations with both ideal (sector) and full 3D field maps of the dipole magnet. Issues associated with placing a 3D dipole field with fringe on a bent simulation coordinate system are addressed. Placement of the dipole bend is optimized consistent with the 3D field and is found to closely correspond to the ideal field center. Minimal problems are found (small centroid shift and distribution distortions) due to 3D space-charge effects in the species separation within the bend when using simple fractional neutralization factors.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC010  
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TUPLR057 Advanced Design Optimizations of a Prototype for a Newly Revised 4-Rod CW RFQ for the HLI at GSI rfq, resonance, simulation, impedance 586
 
  • D. Koser, H. Podlech
    IAP, Frankfurt am Main, Germany
  • P. Gerhard, L. Groening
    GSI, Darmstadt, Germany
  • O.K. Kester
    TRIUMF, Vancouver, Canada
 
  Within the scope of the FAIR project (Facility for Antiproton and Ion Research) at GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, the front end of the existing High Charge State Injector (HLI) is upgraded for cw operation. The dedicated new 4-Rod RFQ structure is currently being designed at the Institute for Applied Physics (IAP) of the Goethe University of Frankfurt. The overall design is based on the RFQ structures that were originally developed for FRANZ* and MYRRHA**. Regarding the HLI-RFQ the comparatively low operating frequency of 108 MHz causes a general susceptibility towards mechanical vibrations especially concerning the electrodes because of the necessarily larger distance between the stems. Besides RF simulations and basic thermal simulations with CST Studio Suite, the key issues like mechanical electrode oscillations as well as temperature distribution from heat loss in cw operation are investigated with simulations using ANSYS Workbench. At first instance a dedicated 6-stem prototype is currently being manufactured in order to validate the simulated RF performance, thermal behavior and structural mechanical characteristics.
*M. Heilmann et al., A Coupled RFQ-IH Cavity for the Neutron Source FRANZ, IPAC13
**C. Zhang, H. Podlech, New Reference Design of the European ADS RFQ Accelerator For MYRRHA, IPAC14
 
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TUPLR059 Asymmetric Four-Vane RFQ quadrupole, impedance, rfq, simulation 592
 
  • A.S. Plastun
    ANL, Argonne, Illinois, USA
  • A. Kolomiets, D.A. Liakin
    ITEP, Moscow, Russia
 
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
A four-vane resonator is widely used in Radio Frequency Quadrupole (RFQ) accelerators. The field distribution in a long four-vane resonator can be easily perturbed by nearest dipole modes which are excited due to the local geometry errors. This paper describes the electromagnetic properties of a four-vane resonator with an introduced asymmetry between neighboring chambers. The asymmetry provides necessary separation of dipole modes keeping losses and field uniformity of quadrupole mode similar to those in a conventional four-vane resonator. This feature of an asymmetric resonator is confirmed by analytical results from transmission line model as well as by CST Studio simulations.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR059  
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TUPLR060 RF Design of the Nuclotron-NICA 145.2 MHz RFQ rfq, Windows, coupling, simulation 595
 
  • A.S. Plastun, V. Andreev, V.A. Koshelev, T. Kulevoy, V.G. Kuzmichev, D.A. Liakin, A. Sitnikov
    ITEP, Moscow, Russia
  • A.V. Butenko
    JINR, Dubna, Moscow Region, Russia
 
  ITEP has designed the Radio-Frequency Quadrupole (RFQ) linac for the JINR NICA Complex (Dubna, Russia) to provide ion beams (q/A ≥ 0.3) with energy of 156 keV/u for further acceleration by existing Alvarez-type linac. The RFQ is based on a 4-vane structure with magnetic coupling windows in order to avoid a risk of excitation of dipole field components inherent in a conventional 4-vane resonator. The paper presents results of the radio-frequency (RF) design and capabilities used for coarse and fine tuning of the field distribution and resonant frequency during manufacturing and finalizing of the RFQ.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR060  
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TUPLR067 Solenoid/Magnetic Shielding Test Results in FRIB-1&2 Cryomodules solenoid, cryomodule, cavity, shielding 607
 
  • D. Luo, H. Ao, E.E. Burkhardt, J. Casteel, A. Ganshyn, W. Hartung, M.J. Holcomb, J.T. Popielarski, K. Saito, S. Shanab, E. Supangco, M. Thrush
    FRIB, East Lansing, 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 State of Michigan and Michigan State University.
Recently we did bunker tests for FRIB first cryomodule (CM-1) and second one (CM-2) which houses 0.085 QWRs and solenoid packages. Their performances were successfully validated in the full configuration. This paper reports the solenoid package tests results.
 
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TH1A06 High-Frequency Compact RFQs for Medical and Industrial Applications rfq, proton, linac, ion 704
 
  • M. Vretenar, V.A. Dimov, M. Garlaschè, A. Grudiev, B. Koubek, A.M. Lombardi, S.J. Mathot, D. Mazur, E. Montesinos, M.A. Timmins
    CERN, Geneva, Switzerland
 
  CERN has completed the construction of a 750 MHz RFQ reaching 5 MeV proton energy in a length of only 2 meters, to be used as injector for a compact proton therapy linac. Beyond proton therapy, this compact and lightweight design can be used for several applications, ranging from the production of radioisotopes in hospitals to ion beam analysis of industrial components or of artworks. The ex-perience with the construction of the first unit will be pre-sented together with the design and plans for other appli-cations.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A06  
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THPRC024 Polarity Check of the FRIB Cryomodule Solenoids by Measuring Leakage Magnetic Field solenoid, cryomodule, vacuum, linac 821
 
  • H. Ao, D. Luo, F. Marti, K. Saito, S. Shanab
    FRIB, East Lansing, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661.
We observed the outside magnetic field of the first β=0.085 production cryomodule while a solenoid and steering dipoles are under operation. This measurement aims to check the polarity on these magnets after the final installation in the accelerating tunnel. This paper also shows the residual magnetic field variation through the degaussing process of these magnets.
 
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THPRC028 Deflector Design for Spin Rotator in Muon Linear Accelerator simulation, solenoid, experiment, vacuum 830
 
  • S. Artikova
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • T. Mibe, M. Otani
    KEK, Tsukuba, Japan
 
  A muon g-2/EDM experiment based on muon linear accelerator was proposed for the J-PARC muon facility. In this experiment, the ultra-slow muons created in muonium target region will be accelerated to 210 MeV kinetic energy then will be injected into the muon storage ring to measure the decay products depending on the muon spin. Therefore, a spin rotator (device) is a key component of the muon linac. Spin rotator consists of a pair of combined electrostatic and magnetic deflectors and a pair of solenoids which will be placed in between these two deflectors. In this paper, we report the design of these two dispersion-free deflectors and the simulation results of the device performance will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC028  
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THPLR049 Tuning the IFMIF 5MeV RFQ Accelerator rfq, insertion, target, vacuum 969
 
  • A. Palmieri, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
 
  In order to allow proper operation of the IFMIF RFQ, it is necessary to perform a campaign of RF measurements on the cavity aimed, on one hand, at determining the basic RF parameters (frequency, Q0, etc.), on the other hand at verifying the fulfilment of the voltage law within the specified admitted range (±2% target value, ±4% acceptance value) of any of the perturbative components upon successive tuner settings as predicted by the tuner algorithm. These measurements also involve the determination of the proper depth of the end plates and the positioning and length of the Dipole Stabilizers (if any). In this contribution the tuning procedure and the results of such measurements will be presented for the case of the IFMIF RFQ will be described.  
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THPLR063 RF Design of a Deuteron Beam RFQ rfq, cavity, simulation, operation 996
 
  • C.X. Li, W.P. Dou, Y. He, F.F. Wang, Z.J. Wang, X.B. Xu, Z.L. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
 
  In a material irradiation facility in IMP, a RFQ is required for accelerating deuteron beam from 20 keV/u to 1.52 MeV/u. The structure design of the RFQ is drawing on the experience of the RFQ of Injector II of China ADS LINAC. Four-vane structure is adopted and the operation frequency is 162.5 MHz. Inter vane voltage is 65 kV and the Kilpatrick factor is 1.4. Π-mode stabilizing loops are used to move the dipole modes away from the working mode. Slug tuners are used to compensate for capacitance errors induced by machining. Cutbacks and end plate are modified to reach a reasonable field flatness. After the structure design and optimization, the simulation results of the cavity frequency is 162.459 MHz, the power loss is 109 kW. The multiphysics simulations are also performed to determine the frequency shift caused by the shift of the cooling water temperature.  
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THPLR064 Design and Simulation of a High Intensity Heavy Ion RFQ Accelerator Injector rfq, simulation, ion, heavy-ion 999
 
  • W. Ma, Y. He, C.X. Li, L. Lu, L.B. Shi, L.P. Sun, X.B. Xu, Z.L. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
 
  An 81.25 MHz continuous wave (CW) radio frequency quadrupole (RFQ) accelerator has been developed for Low Energy Accelerator Facility (LEAF) at the Institute of Modern Physics (IMP), the Chinese Academy of Science (CAS). In the CW operating mode, the proposed RFQ design adopted the conventional four-vane structure. The main design goals are providing the high shunt impendence with low power losses. In the electromagnetic (EM) design, the π-mode stabilizing loops (PISLs) were optimized to produce a good mode separation. The tuners were also designed and optimized to tune frequency and field flatness of the operating mode. The vane undercuts were optimized to provide a flat field along the RFQ cavity. Additionally, a full length model with modulations was set up for the final EM simulations. In this paper, detailed EM design of the LEAF-RFQ will be presented and discussed. Meanwhile, structure error analysis is also studied.  
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