Keyword: DTL
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MOPAB206 The RF Parameters of Heavy Ions Linac cavity, rfq, linac, MEBT 679
 
  • A. Sitnikov, G. Kropachev, T. Kulevoy, D.N. Selesnev, A.I. Semennikov
    ITEP, Moscow, Russia
  • M.L. Smetanin, A.V. Telnov, N.V. Zavyalov
    VNIIEF, Sarov, Russia
 
  The new linac for A/Z = 8, output energy 4 MeV/u and 3 mA current is under development at NRC "Kurchatov Institute"-ITEP. The linac consists of Radio-Frequency Quadrupole (RFQ) with operating frequency 40 MHz and two sections of Drift Tube Linac (DTL) with operating frequency 80 and 160 MHz, correspondently. Both DTL has a modular structure and consists of separated individually phased resonators with focusing magnetic quadrupoles located between the cavities. The DTL1 is based on the quarter-wave resonators meanwhile DTL2 is based on IH 5-gap resonators. The 6D beam matching between RFQ and DTLs is provided by magnetic quadrupole lenses and 2-gaps RF-bunchers. The paper presents results of the radio-frequency (RF) design of linac accelerating structures.  
poster icon Poster MOPAB206 [0.559 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB206  
About • paper received ※ 14 May 2021       paper accepted ※ 01 July 2021       issue date ※ 29 August 2021  
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MOPAB208 LLRF Measurements and Cu-plating at the First-of-Series Cavity Section of the Alvarez 2.0 at GSI cavity, operation, simulation, vacuum 686
 
  • M. Heilmann, T. Dettinger, X. Du, L. Groening, S. Mickat, A. Rubin
    GSI, Darmstadt, Germany
 
  The Alvarez 2.0 will replace the existing post-stripper DTL of the GSI UNILAC. Today’s GSI comprises the UNILAC and the synchrotron SIS18 and is going to serve as the injector chain for the Facility of Antiproton and Ion Research (FAIR). The new Alvarez-type DTL is operated at 108.4 MHz providing acceleration from 1.4 MeV/u to 11.4 MeV/u along a total length of 55 meters. The first-of-series (FoS) cavity section has 12 RF-gaps along a total length of 1.9 m. It is the first cavity section of the new DTL. All main components were delivered in 2019, followed by successful SAT and installation of the 11 drift tubes and copper-plating. Completion of first low level RF-measurements prior to copper plating and the subsequent plating are major project milestones. These proceedings report on the results and compares them to simulation using CST Microwave Studio.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB208  
About • paper received ※ 18 May 2021       paper accepted ※ 31 May 2021       issue date ※ 22 August 2021  
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MOPAB263 Preliminary Beam Dynamics Studies for 200 MeV Superconducting Linac Planned at KOMAC linac, proton, radiation, lattice 837
 
  • S. Lee, J.J. Dang, H.S. Kim, H.-J. Kwon
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
  • Y.-S. Cho
    KAERI, Daejon, Republic of Korea
 
  Funding: This work has been supported through KOMAC operation fund of KAERI by the Korea government (MSIT).
Korea Multi-purpose Accelerator Complex (KOMAC) is planning an energy upgrade of the existing 100 MeV proton linac to 200 MeV using a superconducting Half Wave Resonator (HWR) operating at 350 MHz. A cryomodule is planned to house four HWR cavities with a warm doublet focusing lattice structure. Matching between the already existing DTL section and HWR section is designed and studied. We report the preliminary study of the beam dynamics of the 200 MeV superconducting linac carried out at KOMAC.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB263  
About • paper received ※ 20 May 2021       paper accepted ※ 01 July 2021       issue date ※ 24 August 2021  
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MOPAB335 SNS Warm Linac Circulator Breakdown Considerations for the PPU Project operation, linac, simulation, proton 1041
 
  • G.D. Toby, Y.W. Kang, S.-H. Kim, S.W. Lee, J.S. Moss
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: * This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract number DE-AC05-00OR22725.
Multipacting in accelerating structures is a complex phenomenon about which there is much to be understood. While multipacting research efforts have primarily been focused on superconducting radio frequency (SRF) systems, normal conducting accelerating structures which have a higher thermal capacity, and a greater vacuum pressure tolerance could benefit from additional investigation. This research details multipacting simulation methods and the results of 3-D electromagnetic simulations of RF vacuum windows used on normal conducting linac (NCL) cavities. Benchmarking of the peak electric fields in these structures, benefits of material processing and possible techniques for reducing or eliminating multipacting activities are discussed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB335  
About • paper received ※ 17 May 2021       paper accepted ※ 28 May 2021       issue date ※ 23 August 2021  
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TUPAB168 Beam Commissioning of a 325 MHz Proton IH-DTL at XiPAF cavity, proton, emittance, linac 1777
 
  • P.F. Ma, X. Guan, R. Tang, M.W. Wang, X.W. Wang, Q.Z. Xing, W.B. Ye, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, Y. Yang, M.T. Zhao
    NINT, Xi’an, People’s Republic of China
 
  The Inter-Digital H-mode Drift Tube Linac (IH-DTL) is widely used as the main component of injectors for medical synchrotrons. This paper describes the beam commissioning of a compact 325 MHz IH-DTL with modified KONUS beam dynamics at Tsinghua University (THU). This IH-DTL accelerates the proton beam from 3 MeV to 7 MeV in 1m. The average energy of the beam is 7.0 MeV with the energy spread range of -0.6 MeV to 0.3 MeV. The output transverse normalized RMS emittance of the beam is 0.58 (x)/0.58 (y) pi mm mrad with the input emittance of 0.43 (x)/0.37 (y) pi mm mrad. The beam test results show good agreement with the beam dynamics design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB168  
About • paper received ※ 08 May 2021       paper accepted ※ 16 June 2021       issue date ※ 14 August 2021  
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TUPAB169 Overall Concept Design of a Heavy-Ion Injector for XiPAF-Upgrading heavy-ion, rfq, LEBT, ion-source 1781
 
  • P.F. Ma, C.T. Du, X. Guan, Y. Lei, M.W. Wang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao
    NINT, Xi’an, People’s Republic of China
 
  A heavy-ion injector can be used for SEE study. In this paper, the primary beam dynamics design of a heavy-ion injector for the XiPAF upgrade is presented. The injector consists of an ECR heavy-ion source, a LEBT, an RFQ, and a DTL. The mass charge ratio can be up to 6.5. The RFQ can accelerate heavy ions to 500 keV/u, and the DTL can accelerate the ions to 2 MeV/u, which can meet the requirement of the synchrotron.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB169  
About • paper received ※ 16 May 2021       paper accepted ※ 16 June 2021       issue date ※ 11 August 2021  
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TUPAB170 Decouple Transverse Coupled Beam in the DTL with Tilted PMQs emittance, coupling, rfq, cavity 1785
 
  • P.F. Ma, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • Y.H. Pu, J. Qiao, C.P. Wang, X.C. Xie, F. Yang
    Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China
 
  The coupling of the beam is widely studied in the accelerator physics field. Projected transverse emittances easily grow up if the beam is transversely-coupled. If we decouple the transverse coupled beam, the transverse emittance can be small. The matrix approach based on the symplectic transformation theory for decoupling the coupled beam is summarized. For a proton accelerator, the transverse coupled beam is introduced by an RFQ tilted by 45°. The beam is decoupled with the first five tilted quadrupoles mounted in the DTL section. A study on the gradient choice of the quadrupoles and the space charge effect is given in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB170  
About • paper received ※ 08 May 2021       paper accepted ※ 21 June 2021       issue date ※ 28 August 2021  
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TUPAB172 Quadrupole Magnet Design for a Heavy-Ion IH-DTL quadrupole, heavy-ion, proton, linac 1793
 
  • P.F. Ma, C.T. Du, X. Guan, M.W. Wang, X.W. Wang, Y.L. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
    TUB, Beijing, People’s Republic of China
  • W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao
    NINT, Xi’an, People’s Republic of China
 
  Xi’an Proton Application Facility (XiPAF) will be upgraded to provide heavy-ion beams with a heavy-ion injector. The injector consists of an ECR heavy-ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole (RFQ), an Interdigital H-mode Drift Tube Linac (IH-DTL), and a Linac to Ring Beam Transport line (LRBT). The IH-DTL can accelerate the ions with mass to charge up to 6.5 from 0.4 MeV/u to 2 MeV/u. To provide transverse focusing, the electro-magnetic quadrupoles are installed inside the drift tubes of IH-DTL, thus the magnet needs to be high-gradient and compact. This paper gives the quadrupole magnet design for the heavy-ion IH-DTL. The results show that the quadrupole magnet design can meet the requirements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB172  
About • paper received ※ 08 May 2021       paper accepted ※ 21 June 2021       issue date ※ 23 August 2021  
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TUPAB173 ESS Drift Tube Linac Manufacturing, Assembly and Tuning linac, cavity, alignment, emittance 1797
 
  • F. Grespan, L. Antoniazzi, A. Baldo, C. Baltador, A. Battistello, L. Bellan, P. Bottin, M. Comunian, D. Conventi, E. Fagotti, L. Ferrari, A. Palmieri, R. Panizzolo, A. Pisent, D. Scarpa
    INFN/LNL, Legnaro (PD), Italy
  • R.A. Baron
    ESS, Lund, Sweden
  • T. Bencivenga, P. Mereu, C. Mingioni, M. Nenni, E. Nicoletti
    INFN-Torino, Torino, Italy
  • A.G. Colombo
    INFN- Sez. di Padova, Padova, Italy
  • B. Jones
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  The Drift Tube Linac (DTL) for the ESS Linac will accelerate H+-beams of up to 62.5 mA peak current from 3.62 to 90 MeV. The structure consists of five cavities. The first cavity (DTL1) is a 7.6 m long tank containing 60 drift tubes, 23 fixed tuners, 3 movable tuners and 24 post-couplers, operating at a frequency of 352.21 MHz and an average accelerating field of 3.0 MV/m. The cavity is now assembled at ESS, the results of alignment and tuning are here presented. The DTL1 "as-built" as been analyzed from the beam dynamics point of view. The manufacturing of DTL4 and DTL3 is completed and they are now under assembly at ESS. DTL2 and DTL5 manufacturing will be completed within 2021. The paper describes the production and assembly stages, with a focus on the statistics of quality check in terms of metrology, alignment, leak tests.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB173  
About • paper received ※ 19 May 2021       paper accepted ※ 27 May 2021       issue date ※ 14 August 2021  
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TUPAB175 ESSnuSB Linac and Transfer Line: Lattice Design and Error Studies linac, lattice, dipole, proton 1805
 
  • N. Blaskovic Kraljevic, M. Eshraqi, B.T. Folsom
    ESS, Lund, Sweden
 
  Funding: ESSnuSB has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The ESS neutrino superbeam (ESSnuSB) project is being studied as an upgrade to the European Spallation Source (ESS). This proposed upgrade consists of adding an H source to the existing beamline in order to send H pulses in between proton pulses, effectively doubling the beam power from 5 MW to 10 MW. In this contribution, we present the 2.5 GeV linear accelerator (linac) lattice and the design of the transfer line from the linac to the accumulator ring, where pulses would be stacked to achieve short proton pulses of high intensity. The results of error studies, quantifying the effect of accelerator imperfections and H ion stripping losses on the beam transport through the linac and transfer line, are also presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB175  
About • paper received ※ 19 May 2021       paper accepted ※ 14 June 2021       issue date ※ 31 August 2021  
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TUPAB176 ESS Proton Beam Trajectory Correction MEBT, linac, simulation, ion-source 1809
 
  • N. Blaskovic Kraljevic, M. Eshraqi, N. Milas, R. Miyamoto
    ESS, Lund, Sweden
 
  The proton linac of the European Spallation Source (ESS) is under construction in Lund, Sweden. Beam trajectory correction is essential to mitigate the effect of accelerator element misalignment, constituting the first step to minimise beam losses. The correction will be performed using correctors distributed along the accelerator, based on the beam position monitor (BPM) readout. Three trajectory correction techniques are considered: one-to-one steering, Singular Value Decomposition (SVD), and MICADO (selecting a subset of correctors for the trajectory correction). The performance of the three methods is simulated for the ESS linac and a comparison of the outcomes is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB176  
About • paper received ※ 19 May 2021       paper accepted ※ 15 June 2021       issue date ※ 27 August 2021  
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TUPAB198 ESS DTL Tuning Using Machine Learning Methods network, cavity, linac, proton 1872
 
  • J.S. Lundquist, N. Milas, E. Nilsson
    ESS, Lund, Sweden
  • S. Werin
    Lund University, Lund, Sweden
 
  The European Spallation Source, currently under construction in Lund, Sweden, will be the world’s most powerful neutron source. It is driven by a proton linac with a current of 62.5 mA, 2.86 ms long pulses at 14 Hz. The final section of its normal-conducting front-end consists of a 39 m long drift tube linac (DTL) divided into five tanks, designed to accelerate the proton beam from 3.6 MeV to 90 MeV. The high beam current and power impose challenges to the design and tuning of the machine and the RF amplitude and phase have to be set within 1% and 1 degree of the design values. The usual method used to define the RF set-point is signature matching, which can be a time consuming and challenging process, and new techniques to meet the growing complexity of accelerator facilities are highly desirable. In this paper we study the usage of Machine Learning to determine the RF optimum amplitude and phase. The data from a simulated phase scan is fed into an artificial neural network in order to identify the needed changes to achieve the best tuning. Our test for the ESS DTL1 shows promising results, and further development of the method will be outlined.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB198  
About • paper received ※ 17 May 2021       paper accepted ※ 21 June 2021       issue date ※ 13 August 2021  
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TUPAB205 Advancement of LANSCE Front End Accelerator Facility rfq, proton, neutron, linac 1894
 
  • Y.K. Batygin, D. Gorelov, S.S. Kurennoy, J.W. Lewellen, N.A. Moody, L. Rybarcyk
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by US DOE under contract 89233218CNA000001
The LANSCE accelerator started routine operation in 1972 as a high-power facility for fundamental research and national security applications. To reduce long-term operational risk, we propose to develop a new Front End of accelerator facility. It contains 100-keV injector with 3-MeV RFQ, and 6-tanks Drift Tube Linac to accelerate particles up to energy of 100 MeV. The low-energy injector concept includes two independent transports merging H+ and H beams at the entrance of RFQ. Beamlines are aimed to perform preliminary beam bunching in front of accelerator section with subsequent simultaneous acceleration of two different beams in a single RFQ. The paper discusses design topics of new Front End of accelerator facility.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB205  
About • paper received ※ 12 May 2021       paper accepted ※ 28 May 2021       issue date ※ 14 August 2021  
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TUPAB329 Pattern Based Parameter Setup of the SNS Linac cavity, linac, operation, beam-losses 2276
 
  • C.C. Peters
    ORNL RAD, Oak Ridge, Tennessee, USA
  • A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy.
Theoretical and practical aspects of beam tuning procedures used for the SNS linac are discussed. The SNS linac includes two sections of beam acceleration. Acceleration in the first section up to 185.5 MeV is done with a room temperature copper linac which consists of both Drift Tube Linac (DTL) and Coupled Cavity Linac (CCL) Radio Frequency (RF) cavities. The second section consists of 81 Superconducting RF (SRF) cavities which accelerate the beam to the final beam energy of 1 GeV. The linac is currently capable of delivering an average beam power output of 1.44 MW with typical yearly operating hours of around 4500 hours. Due to the high power output and high availability of the linac, activation of accelerator equipment is a significant concern. The linac tuning process consists of three stages: model based setup of amplitudes and phases of the RF cavities, empirical beam loss reduction, and then documentation of the final amplitudes and phases of RF cavities after the empirical tuning. The final step is needed to ensure fast recovery from an SRF cavity failure. This paper discusses models, algorithms, diagnostic tools, software, and practices that are used for these stages.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB329  
About • paper received ※ 22 May 2021       paper accepted ※ 28 May 2021       issue date ※ 25 August 2021  
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WEXB06 Development of an APF IH-DTL in the J-PARC Muon g-2/EDM Experiment linac, cavity, experiment, focusing 2544
 
  • Y. Nakazawa, H. Iinuma
    Ibaraki University, Hitachi, Ibaraki, Japan
  • E. Cicek, N. Kawamura, T. Mibe, M. Yoshida
    KEK, Ibaraki, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • Y. Iwata
    NIRS, Chiba-shi, Japan
  • R. Kitamura, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • M. Otani, N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Sue, K. Sumi, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • Y. Takeuchi
    Kyushu University, Fukuoka, Japan
  • T. Yamazaki
    KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
 
  An inter-digital H-mode drift-tube linac (IH-DTL) is under development in a muon linac at the J-PARC muon g-2/EDM experiment. It accelerates muons from 0.34 MeV to 4.3 MeV at an operating frequency of 324 MHz. The cavity can be miniaturized by introducing the alternative phase focusing (APF) method that enables transverse focusing only with an E-field. The APF IH-DTL cavity was modeled by a three-dimensional field analysis, and the beam dynamics were evaluated numerically. The beam emittance was calculated as 0.316pi and 0.189pi mm mrad in the horizontal and vertical directions, respectively. It satisfies the experimental requirement. Actually, the field error due to the fabrication errors and thermal expansion during operation causes an emittance growth. It was evaluated that the optimized tuners can suppress the emittance growth to less than 10%. In this paper, the detailed design of the APF IH-DTL including the tuner will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXB06  
About • paper received ※ 19 May 2021       paper accepted ※ 29 July 2021       issue date ※ 20 August 2021  
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WEPAB297 A Recent Upgrade on Phase Drift Compensation System for a Stable Beam Injection at J-PARC Linac linac, cavity, injection, controls 3357
 
  • E. Cicek, Z. Fang, Y. Fukui, K. Futatsukawa
    KEK, Ibaraki, Japan
  • T. Hirane, S. Shinozaki
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Sato
    Nippon Advanced Technology Co., Ltd., Tokai, Japan
 
  J-PARC linac, consisting of 324 MHz and 972 MHz acceleration sections, delivers H beam to the rapid cycling synchrotron (RCS). The drift in the beam injection momentum from linac to RCS was measured to be highly dependent on the humidity at the klystron gallery. Also, changes in both temperature and humidity strongly affect the rf field phase controlled within the digital feedback (DFB) system. To cope with this, a unique phase drift compensation system, namely the phase drift monitor (PDM) system, is implemented in the MEBT2B1 station as the first step at the linac. However, the compensation of the drift correction could not be achieved directly since two different frequencies were used. The new PDM, which adapts the direct sampling method using the Radio Frequency System-on-Chip (RFSoC), will pave the way to ensure rf phase stability at all stations simultaneously. Here we present the effects of temperature and humidity on the rf field phase, along with performance and preliminary test results concerning the phase drift compensation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB297  
About • paper received ※ 19 May 2021       paper accepted ※ 01 July 2021       issue date ※ 18 August 2021  
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THPAB185 Solution to Beam Transmission Decline in the CSNS Linac Operation Using Measurements and Simulations rfq, linac, emittance, operation 4134
 
  • J. Peng, M.T. Li, X.H. Lu, X.B. Luo
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan
    IHEP, Beijing, People’s Republic of China
 
  The CSNS linac operation at its design average power currently. However, the beam transmission is declining and the beam loss is increasing during the operation. With simulations and experiments, we found there is a long longitudinal tail exist in the beam bunch output from the RFQ. And this tail caused the beam loss in the following linac. After inhibition of the longitudinal tail in the beam bunch, the beam transmission in operation can keep stable.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB185  
About • paper received ※ 19 May 2021       paper accepted ※ 01 July 2021       issue date ※ 02 September 2021  
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THPAB204 End-to-End RMS Envelope Model of the ISAC-I Linac ISAC, rfq, linac, simulation 4183
 
  • O. Shelbaya, R.A. Baartman, O.K. Kester
    TRIUMF, Vancouver, Canada
 
  A full end-to-end simulation of the ISAC-I linear accelerator has been built in the first order envelope code TRANSOPTR. This enables the fast tracking of rms sizes and correlations for a 6-dimensional hyperellipsoidal beam distribution defined around a Frenet-Serret reference particle frame, for which the equations guiding envelope evolution are numerically solved through a model of the machine’s electromagnetic potentials. Further, the adopted formalism enables the direct integration of energy gain via time-dependent accelerating potentials, without resorting to transit-time factors.  
poster icon Poster THPAB204 [0.627 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB204  
About • paper received ※ 18 May 2021       paper accepted ※ 08 July 2021       issue date ※ 31 August 2021  
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THPAB286 Quadrupole Focusing Lenses for Heavy Ion Linac focusing, quadrupole, flattop, operation 4359
 
  • V. Skachkov, A.V. Kozlov, G. Kropachev, T. Kulevoy, D.A. Liakin, O.S. Sergeeva, V.S. Skachkov, Yu. Stasevich
    ITEP, Moscow, Russia
 
  Simulation results of pulsed current electromagnet quadrupoles with integral of the magnetic field gradient up to 7 T are presented. Magnets for the DTL and MEBT focusing channels are designing for the heavy-ion linac in Institute for Theoretical and Experimental Physics (ITEP - NRC "Kurchatov Institute"). Appropriate conditions which promise getting the magnetic lens parameters required at restrictions on the overall length <130 mm as well as on the beam aperture >45 mm are defined. It is shown that the channel acceptance to beam emittance ratio desired not less than 3 can be provided by conventional low-carbon steel up to a magnetic aperture of 50 mm in diameter while beyond this size permendur is out of competition. Some aspects of the pulsed power supply system are considered and main parameters of the pulse current generator (PCG) are given.  
poster icon Poster THPAB286 [0.701 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB286  
About • paper received ※ 14 May 2021       paper accepted ※ 30 June 2021       issue date ※ 02 September 2021  
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THPAB296 The Spallation Neutron Source Normal Conducting Linac RF System Design for the Proton Power Upgrade Project cavity, GUI, klystron, linac 4383
 
  • J.S. Moss, M.T. Crofford, S.W. Lee, G.D. Toby
    ORNL, Oak Ridge, Tennessee, USA
  • M.E. Middendorf
    ORNL RAD, Oak Ridge, Tennessee, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract number DE-AC05-00OR22725.
The Proton Power Upgrade (PPU) project at the Spallation Neutron Source will double the available proton beam power from 1.4 to 2.8 MW by increasing the beam energy from 1.0 to 1.3 GeV and the beam current from 26 to 38 mA. The increase in beam current resulted in the need to redesign the existing normal conducting linac (NCL) RF Systems. High-power testing of the existing NCL RF Systems configured to accelerate PPU-level beam provided the data used to make the final design decisions. This paper describes the development and execution of those in-situ tests and the subsequent results.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB296  
About • paper received ※ 17 May 2021       paper accepted ※ 22 July 2021       issue date ※ 20 August 2021  
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THPAB319 RF Power Generating System for the Linear Ion Accelerator rfq, controls, MEBT, power-supply 4417
 
  • V.G. Kuzmichev, T. Kulevoy, D.A. Liakin, D.N. Selesnev, A. Sitnikov
    ITEP, Moscow, Russia
  • M.L. Smetanin, A.V. Telnov, N.V. Zavyalov
    VNIIEF, Sarov, Russia
 
  An RF power supply system based on solid-state amplifiers has been developed for the linear accelerator of heavy ions. The report contains information on the characteristics and composition of the system, presents the LLRF structure for RFQ and DTL sections.  
poster icon Poster THPAB319 [0.275 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB319  
About • paper received ※ 16 May 2021       paper accepted ※ 16 August 2021       issue date ※ 19 August 2021  
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