Keyword: DTL
Paper Title Other Keywords Page
MOPAB099 Design Study of Drift Tube Linac for BNCT Accelerator quadrupole, simulation, rfq, linac 359
 
  • Y. Lee, S.W. Jang, E.-S. Kim
    Korea University Sejong Campus, Sejong, Republic of Korea
  • B.H. Choi
    IBS, Daejeon, Republic of Korea
  • D.S. Kim
    Dawonsys, Siheung-City, Republic of Korea
  • Z. Li
    SCU, Chengdu, People's Republic of China
  
  A-BNCT accelerator is being developed as a proton accelerator with a high beam current of 50 mA for effective cancer therapy. Drift tube linac (DTL) with the length of 4.5 m is composed of 1 tank and 48 drift tubes (DTs). Proton beam is accelerated from 3 MeV to 10 MeV. Electromagnetic quadrupoles (EMQs) are inserted into every DT for transverse focusing. Slug tuners and post couplers (PCs) are used for accelerating field stabilization and resonant frequency tuning, respectively. The beam dynamics and engineering design for the DTL are performed for effective beam acceleration, and the design results are in detail presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB099  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUYA1 Linac4: From Initial Design to Final Commissioning linac, quadrupole, proton, emittance 1217
 
  • A.M. Lombardi
    CERN, Geneva, Switzerland
  
  This talk reviews the design, construction, and commissioning effort of CERN's new proton linear accelerator, Linac4, which has recently been commissioned and which is presently undergoing a reliability run. Linac4 will be connected to the LHC proton injector chain during the next long LHC shut down (LS2) and will then replace the ageing Linac2.  
slides icon Slides TUYA1 [30.159 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUYA1  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUOBA1 Beam Commissioning Results of the CSNS Linac linac, rfq, cavity, quadrupole 1223
 
  • J. Peng, 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
  • M.T. Li, Y.D. Liu
    CSNS, Guangdong Province, People's Republic of China
  
  The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW pro-ton beam to a solid metal target for neutron scattering research. It consists of a 50keV H− Ion Source, a 3MeV Radio Frequency Quadrupole (RFQ), an 80MeV Drift Tube Linac (DTL), and a 1.6GeV Rapid-cycling Synchro-tron (RCS). The beam commissioning has been started since April 2015. The Front End and three of the four DTL tanks have been commissioned, while the last tank and the RCS will be commissioned at the autumn this year. At the end of the DTL3, beam has been accelerated to 61MeV with nearly 100% transmission, other parame-ters such as peak current, transverse emittance and beam orbit have reached the design goal. Results and status of the beam commissioning program will be presented.
*This work is supported by National Natural Science Foundation of China (11505101).
**E-mail:pengjun@ihep.ac.cn
 		 
slides icon Slides TUOBA1 [4.272 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOBA1  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA057 Design Study for a Prototype Alvarez-Cavity for the Upgraded Unilac cavity, operation, ion, quadrupole 2205
 
  • M. Heilmann, X. Du, P. Gerhard, L. Groening, M. Kaiser, S. Mickat, A. Rubin
    GSI, Darmstadt, Germany
  • A. Seibel
    IAP, Frankfurt am Main, Germany
  
  The design study describes the prototype Alvarez-tank of the new post-stripper of the UNILAC. A prototype with 17 drift tubes (including quadrupole singulets) of 3 m of total length and 2 m of diameter will be manufactured. This cavity features new drift tube shape profiles to provide for high shunt impedance at a maximum electric surface field of 1 Ek. Additionally, it allows realization and high power testing of an optimized stem configuration for field stabilization. In case of successful tuning and long-term operation at high power level, it shall be used as a first of series cavity of the new UNILAC post-stripper DTL.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA057  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA063 RF Tuning Tests on the Coupled FRANZ RFQ-IH-DTL rfq, coupling, resonance, cavity 2224
 
  • A. Almomani, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • M. Heilmann
    GSI, Darmstadt, Germany
  
  The neutron beam at the FRANZ facility will be produced by the 7Li(p, n)7Be reaction using an intense 2 MeV proton beam. These protons will be accelerated from 120 keV to 2 MeV by a coupled 4-Rod-type RFQ and a 8 gap interdigital H-type structure (IH-DTL). This coupled RFQ-IH-cavity will be operated at 175 MHz in cw mode and it has a total length of about 2.3 m. The two structures (RFQ, IH-DTL) are internally coupled inductively, and consequently only one RF-amplifier providing a total power up to 250 kW is needed for operation. The IH-DTL is RF tuned together with an Al-RFQ model, before final IH-DTL installation in the FRANZ cave, while the original RFQ was already installed in the beam line. After RF power and beam tests the coupled structure will be installed and continued with RF and beam. This paper will be focused on the RF tuning process and the main results will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA063  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA067 The KONUS IH-DTL Proposal for the GSI UNILAC Poststripper Linac Replacement linac, emittance, quadrupole, ion 2230
 
  • H. Hähnel, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main, Germany
  
  Funding: BMBF 05P15RFRBA
The GSI UNILAC will serve as the main injector for the upcoming FAIR project. Since the existing Alvarez DTL is in operation for more than 40 years, it has to be replaced to ensure reliable operation in the future. To this purpose a compact and efficient linac design based on IH-type cavities and KONUS beam dynamics has been designed at IAP Frankfurt*. It consists of five 108 MHz IH-type cavities that can be operated by the existing UNILAC RF amplifier structure. The transversal focusing scheme is based on magnetic quadrupole triplet lenses. The optimized design provides full transmission and low emittance growth for the design current of 15 emA U28+ accelerating the beam from 1.4 MeV/u to 11.4 MeV/u. Extensive error studies were performed to define tolerances and verify the stability of the design with respect to misalignment and injection parameters. The design provides a compact and cost efficient alternative to a new Alvarez linac. With a total length of just 22.8 meters it will leave room for future energy upgrades in the UNILAC tunnel.
* H. Hähnel, U. Ratzinger, R. Tiede, Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u, in Proc. LINAC2016, paper TUPLR070 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA067  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA069 Test of a High Power Room Temperature CH DTL Cavity cavity, operation, coupling, impedance 2237
 
  • N.F. Petry, S. Huneck, K. Kümpel, H. Podlech, U. Ratzinger, M. Schwarz
    IAP, Frankfurt am Main, Germany
  
  The Frankfurt Neutron Source at the Stern-Gerlach-Zentrum (FRANZ) is planned to deliver ultra-short neutron pulses at high intensities and repetition rates. As part of FRANZ a 175 MHz room temperature 5-gap CH DTL cavity was designed and built. Its main task will be focusing the particle bunch longitudinally at 2 MeV particle energy. Furthermore the CH cavity can also be used to increase the energy as well as decrease it by 0.2 MeV. The rebuncher and its cooling system is optimized to work with a 5 kW amplifier. The amplification system is intended to provide continuous power (cw mode). Due to its operating parameters being nearly identical to the requirements of the MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) Project, experience for future cavity designs was gained. This includes considerations concerning cooling with use of a 12 kW amplifier. The recent results of conditioning and high power tests will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA069  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA098 Beam Commissioning of Transport Line LRBT of CSNS linac, cavity, emittance, beam-transport 2314
 
  • Z.P. Li, Y. Li, J. Peng, S. Wang
    IHEP, Beijing, People's Republic of China
  
  The linac to ring beam transport line (LRBT) connects the 80 MeV linac and the 1.6 GeV rapid cycling synchrotron (RCS) of the China spallation neutron source (CSNS). The linac and LRBT commissioning have been in progress in the past months and the H− beam has been accelerated to the kinetic energy of 60MeV this April. The H− beam in LRBT which was measured and commissioned transported through the long beam line with low loss. The beam commissioning process and results of LRBT are presented and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA098  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA100 High Power Conditioning and First Beam Acceleration of the CSNS DTL-1 cavity, vacuum, acceleration, linac 2320
 
  • Y. Wang, A.H. Li, B. Li, J. Peng, P.H. Qu, X.L. Wu
    CSNS, Guangdong Province, People's Republic of China
  • Q. Chen, M.X. Fan, K.Y. Gong, H.C. Liu
    IHEP, Beijing, People's Republic of China
  
  The CSNS DTLs are divided into 4 cavities. The DTL-1 was transferred and installed in the CSNS Linac tunnel in August of 2015. The RF high power conditioning of DTL-1 started in December 2015 and ended in February 2016. At the end, we finished DTL-1 high power conditioning mission with peak power 1.5MW (1.1 times design value), 1.625% duty factor (650us, 25Hz). And the first beam has been successfully accelerated to the design value 21.6MeV with nearly 100% transmission efficiency. In this paper, the details of conditioning process were presented and one severe RF discharge breakdown was described specifically, which occurred during high power conditioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA100  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA101 Study of Different Models on DTL for CSNS linac, emittance, alignment, simulation 2322
 
  • Y. Yuan, Z.P. Li, J. Peng
    IHEP, Beijing, People's Republic of China
  
  China Spallation Neutron Source (CSNS) is a high intensity accelerator based facility. Its accelerator consists of an H− injector and a proton Rapid Cycling Synchrotron (RCS). The injector includes the front end and linac. The RFQ accelerates the beam to 3MeV, and then the Drift Tube Linac (DTL) accelerates it to 80MeV. A Medium Energy Beam Transport (MEBT) matches RFQ and DTL, and the DTL consists of four tanks (DTL1, 2, 3, 4). A Linac to Ring Beam Transport (LRBT) matches DTL and RCS, also decreases beam energy spread. Commissioning of the first three DTL tank and LRBT straight section have been almost accomplished in this run. This paper takes a beam dynamics simulation on beam transport in MEBT and DTL at different DTL accelerate models. Meanwhile, beam's central orbit deviation at DTL and LRBT straight section due to DTL mechanical cavity's alignment errors is studied with IMPACT-Z code.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA101  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA104 RF and Primary Beam Dynamics Design of a 325 MHz IH-DTL cavity, proton, linac, simulation 2332
 
  • Y. Lei, X. Guan, C.-X. Tang, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng
    TUB, Beijing, People's Republic of China
  
  An interdigital H-mode drift tube linac (IH-DTL), which is aimed at proton medical facilities, has been proposed and developing at Tsinghua University. Considering following 3 MeV RFQ in the platform of CPHS (Compact Pulse Hadron Source at Tsinghua University) and XiPAF (Xi‘an Proton Application Facility) project, the input energy of IH-DTL is 3 MeV and the RF frequency is 325 MHz. The proton beam can be accelerated from 3 MeV to 7 MeV and the peak current of the beam at the exit of the cavity is about 15 mA. In order to simplify the fabrication, A KONUS structure without focusing element in the cavity is chosen. The RF design of single CELL and the primary dynamics design is done. The co-iteration of dynamics simulation and RF calculation of whole cavity is undergoing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA104  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA105 Development Progress of the 7MeV Linac Injector for the 200MeV Synchrotron of Xi'an Proton Application Facility rfq, linac, ion, ion-source 2336
 
  • Q.Z. Xing, C.B. Bi, C. Cheng, D. Dan, C.T. Du, T.B. Du, X. Guan, Q.K. Guo, Y. Lei, K.D. Man, C.-X. Tang, R. Tang, D. Wang, 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
  • E.Y. Qu, B.C. Wang, Z.M. Wang, Y. Yang, C. Zhao
    State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
  
  We present, in this paper, the development progress of the 7MeV Linac for the 200MeV synchrotron of the Xi'an Proton Application Facility (XiPAF). The 7 MeV linac injector is composed of the 50 keV negative hydrogen ion source, Low Energy Beam Transport line (LEBT), 3 MeV four-vane type Radio Frequency Quadrupole (RFQ) accelerator, 7 MeV Alvarez-type Drift Tube Linac (DTL), and the corresponding RF power source system. The 2.45 GHz microwave-driven Cesium-free Electron Cyclotron Resonance (ECR) source and LEBT will be commissioned in this year, and the peak current of the extracted H− beam at the exit of the LEBT is expected to be 6 mA, with the output energy of 50 keV, maximum repetition rate of 0.5 Hz, beam pulse width of 10~40 microseconds and normalized RMS emittance of less than 0.2 PI mm mrad. Furthermore, the construction status of the RFQ accelerator and DTL accelerator will be presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA105  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA121 Shielding Calculations for the Commissioning Beam Dump During the First Stage Beam Commissioning of the ESS Warm Linac shielding, proton, linac, neutron 2376
 
  • K. Batkov, L. Tchelidze
    ESS, Lund, Sweden
  
  Starting operations in 2019, the European Spallation Source will be a long pulsed neutron source powered by a 5 MW proton beam impinging on a rotating tungsten target. This study describes the results of shielding calculations performed to determine necessary shielding configuration during various steps of first stage beam commissioning of the ESS Linac. The first stage commissioning is divided in four steps with different beam energy, up to maximum 74 MeV. The commissioning beam dump shielding assessment is presented for each step of first stage commissioning and different beam parameters (energies, repetition rates, pulse lengths and currents).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA121  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA125 LINAC5: A Quasi-Alvarez LINAC for BioLEIR linac, ion, rfq, quadrupole 2385
 
  • J.M. Garland, J.-B. Lallement, A.M. Lombardi
    CERN, Geneva, Switzerland
  
  LINAC5 is a new linac proposed for the acceleration of light ions with Q/A = 1/3 to 1/4 for medical applications within the BioLEIR (Low Energy Ion Ring) design study at CERN. We propose a novel quasi-Alvarez drift-tube linac (DTL) accelerating structure design for LINAC5, which can reduce the length of a more conventional DTL structure, yet allows better beam focussing control and flexibility than the inter-digital H (IH) structures typically used for modern ion acceleration. We present the main sections of the linac with total length 12 m, including a 202 MHz radio frequency quadrupole (RFQ) a matching medium energy beam transport (MEBT) and a 405 MHz quasi-Alvarez accelerating section with an output energy of 4.2 MeV/u. Permanent magnet quadrupoles are proposed for use in the quasi-Alvarez structure to improve the compactness of the design and increase the efficiency. Lattice design considerations, multi-particle beam dynamics simulations and RFQ and radio frequency (RF) cavity designs are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA125  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA131 Beam Commissioning Planning Updates for the ESS Linac linac, target, rfq, dipole 2407
 
  • D.C. Plostinar, M. Eshraqi, R. Miyamoto, M. Muñoz
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is a flagship research facility currently under construction in Lund, Sweden. It is driven by a 2 GeV linac, accelerating a 62.5 mA proton beam at a 4% duty cycle. With an average beam power of 5 MW, when completed the ESS linac will become the world's most powerful. In this paper we summarise the latest beam commissioning plans from the ion source to the target, highlighting the individual phases, the beam dynamics challenges as well as the scheduling strategy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA131  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPVA143 Reduction of Beam Losses in LANSCE Isotope Production Facility proton, beam-losses, emittance, target 2432
 
  • Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
  
  The LANSCE Isotope Production Facility (IPF) utilizes a 100-MeV proton beam with average power of 23 kW for isotope production in the fields of medicine, nuclear physics, national security, environmental science and industry. Typical tolerable fractional beam loss in the 100-MeV beamline is approximately 4 x10-3. During 2015-2016 operation cycle, several improvements were made to minimize the beam losses. Adjustments to the ion source's extraction voltage resulted in the removal of tails in phase space. Beam based steering in low-energy and high-energy beamlines led to the reduction of beam emittance growth. Readjustment of the 100-MeV quadrupole transport resulted in the elimination of excessive beam envelope oscillations and removed significant parts of the beam halo at the target. Careful beam matching in the drift tube linac (DTL) provided high beam capture (75% - 80%) and minimized beam emittance growth in the DTL. After improvements, beam losses in the 100-MeV beamline were reduced by an order of magnitude and reached the fractional level of 5 x10-4.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA143  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPIK017 Field Uniformity Preservation Strategies for the ESS DTL: Approach and Simulations simulation, linac, drift-tube-linac, coupling 4139
 
  • G.S. Mauro, F. Grespan, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P. Mereu, M. Mezzano, C. Mingioni, M. Nenni
    INFN-Torino, Torino, Italy
  
  The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2 MHz with a duty cycle of 4 % (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5 mA pulse peak current from 3.62 to 90 MeV. This paper presents the approach taken in order to preserve field flatness of DTL Tanks. This strategy required a set of simulations and consequent choices about RF design of DTL cells, RF coupler tuning and compensation, cooling of the DTL cells. Outcomes of these simulations and the experimental verifications of this approach are then explained.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK017  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPIK049 High Power Conditioning of the DTL-1 for CSNS cavity, vacuum, linac, ion 4207
 
  • H.C. Liu, Q. Chen, K.Y. Gong
    IHEP, Beijing, People's Republic of China
  • M.X. Fan, A.H. Li, B. Li, J. Peng, P.H. Qu, Y. Wang, X.L. Wu
    CSNS, Guangdong Province, People's Republic of China
  
  The RF tuning of the first DTL tank for the China spalla-tion neutron source was finished leading to a stabilized-uniform accelerating field. After the installation of the DTL-1 in the linac tunnel, the high power conditioning was carried out deliberately. Consequently a peak RF power of 1.6MW with 25Hz repetition rate and 650'sec pulse width was put into the tank stably. A 3MeV H− ion was injected into the DTL-1 and was successfully accel-erated to 21.6MeV with almost 100% transmission. Dur-ing the operation, The DTL-1 tank worked stable in the design power level. The conditioning details will be pre-sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK049  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPIK050 Measurement and Tuning of the RF Field for the CSNS DTL cavity, operation, coupling, experiment 4210
 
  • A.H. Li, M.X. Fan, B. Li, J. Peng, P.H. Qu, Y. Wang, X.L. Wu
    CSNS, Guangdong Province, People's Republic of China
  • Q. Chen, S. Fu, K.Y. Gong, H.C. Liu
    IHEP, Beijing, People's Republic of China
  
  The CSNS DTL accelerates negative hydrogen ions from 3MeV to 80MeV with resonant frequency of 324MHz and peak current of 15mA. The CSNS includes four DTL cavities with diameter of 56.6cm and each length of 9 meters. RF properties research and measurement have been done to make sure the design and manufacture validate for beam operation. A new automatic system has been developed for measuring field distribution. The secondary derivation method is used to calculate the amount of the tuners to tune axial field flatness. The tilt of TS curve is used to judge the gap between the post couplers and drift tubes to achieve stability. At last the tanks have good flatness and strong stabilization, the field deviation is 2% with the standard deviation of 0.96%, and the maximum TS parameter is 65%/MHz. After the low power RF tuning experiment, the four tans have been installed in the tunnel, and have gotten good results of high power test and beam acceleration experiment.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK050  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPIK055 Power-Conditioning Cavity Design and Measurement of the Coaxial Coupler for the Injector of XiPAF Project cavity, rfq, coupling, vacuum 4218
 
  • Y. Lei, X. Guan, W. Wang, X.W. Wang, Q.Z. Xing, H.Y. Zhang, S.X. Zheng
    TUB, Beijing, People's Republic of China
  
  For the RF high power conditioning on coaxial power couplers of the XiPAF (Xi'an Proton Application Facility), the RF high power-conditioning cavity was designed and manufactured. The cavity consists of a rectangular reso-nant cavity with two ports, which one is connected with input coupler from RF power source and the other one is connected with output coupler, and a tuner. The tuning frequency range could cover 325 (+0.5, -9.5) MHz. The measured Q factors are matched with the design results generally. But the S-parameter is not ideal compared to the simulation. This paper will present the design and low power measurement results of the cavity  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK055  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPIK061 3D Model Analysis of Cavity for CSNS DTL cavity, simulation, insertion, neutron 4236
 
  • P.H. Qu, M.X. Fan, B. Li, Y. Wang
    CSNS, Guangdong Province, People's Republic of China
  • Q. Chen, K.Y. Gong, A.H. Li, H.C. Liu, F.X. Zhao
    IHEP, Beijing, People's Republic of China
  
  An Alvarez-type Drift tube linac (DTL) was utilized to accelerate an H− ion beam from 3 MeV to 80 MeV of China Spallation neutron source (CSNS). RF field profile is always deviate from the design curve due to errors in fabrication and assembly of the structure cells, thus RF tuning of DTL is necessary. CSNS DTL operates in zero mode and has long tank, so accelerating field of which is unstable, this problem was solved through adding post couplers at the both side of cavity wall. In order to speed up the schedule of DTL low power RF tuning, we analyzed the operating mode, field flatness with slug tuners, field stabilization with post couplers by CST Micro wave studio (MWS) mainly with eigenmode solver in advance. Considering saving the computer memory and increasing the calculation speed, we divided each tank model into three short units. Slug tuner depth and PC-DT gap of DTL-1 and DTL-3 by simulation were shown which improved the efficiency of CSNS DTL RF tuning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK061  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPVA003 Status of the Beam Dynamics Design of the New Post-Stripper DTL for GSI-FAIR emittance, quadrupole, simulation, ion 4414
 
  • A. Rubin, X. Du, L. Groening, M. Kaiser, S. Mickat
    GSI, Darmstadt, Germany
  
  The GSI UNILAC has served as injector for all ion species since 40 years. Its 108 MHz Alvarez DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue and has to be replaced by a new section. The design of the new post-stripper DTL is now under development in GSI. Five Alvarez tanks with four intertank sections provide 100% transmission and low emittance growth. The intertank sections allow for a matched solution and provide place for diagnostics. Simulations along the complete Alvarez DTL were done for 238U28+ using the TraceWin code. The transversal zero current phase advance is 65' for all tanks. Results of beam dynamics simulations for six different scenarios as well as an error study for the FAIR nominal case are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA003  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPVA020 Distribution and Extreme Loss Analysis in the ESS Linac: A Statistical Perspective linac, proton, simulation, alignment 4458
 
  • A.L. Pedersen
    Lund Institute of Technology (LTH), Lund University, Lund, Sweden
  • D. Anevski
    Lund University, Lund, Sweden
  • M. Eshraqi, R. Miyamoto
    ESS, Lund, Sweden
  
  The report takes a statistical approach in the study of distribution evolution of the proton beam within the ESS linac and reports a new technique of pinpointing the non-linear space-charge effect of the propagating proton beam. By using the test statistic from the nonparametric Kolmogorov-Smirnov test the author visualises the change in the normalised distributions by looking at the supremum distance between the cumulative distribution functions in comparison, and the propagation of the deviation throughout the ESS linac. This approach identifies changes in the distribution which may cause losses in the linac and highlights the parts where the space-charge has big impact on the beam distribution. Also, an Extreme Value Theory approach is adopted in order to quantify the effects of the non linear forces affecting the proton beam distribution.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA020  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPVA046 Thermo Mechanical Study of the ESS DTL simulation, quadrupole, feedback, linac 4537
 
  • P. Mereu, M. Mezzano, C. Mingioni, M. Nenni
    INFN-Torino, Torino, Italy
  • F. Grespan, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2 MHz with a duty cycle of 4 % (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5 mA pulse peak current from 3.62 to 90 MeV. In this paper the main issues regarding the thermo-mechanical 3D details of the DTL are addressed and a Computational Fluid Dynamics (CFD) model is proposed and validated against the experimental data. The results of these simulations are used to properly design the DTL cooling system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA046  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPVA071 A Method to Design Multi-Cell Accelerator Cavities cavity, linac, drift-tube-linac, focusing 4610
 
  • S.S. Kurennoy
    LANL, Los Alamos, New Mexico, USA
  
  An efficient method for designing multi-cell accelerator cavities has been developed. It is similar to the approach used by Superfish codes for drift-tube linacs (DTL), where a few single cells at representative beam velocities are tuned in 2D and their geometrical parameters are interpolated to cover the required beam-velocity range. The method is implemented using 3D electromagnetic (EM) modeling with CST MicroWave Studio, which allows its application for various types of resonators, e.g., for H-mode cavities. Interpolating results of 3D EM design of tuned representative single-cell cavities leads to a 3D multi-cell cavity model that can be finalized with just a few small adjustments. As a challenging application example, we design multi-cell resonators of three types - cross-bar (CH) and inter-digital (IH) H-mode, as well as DTL - for accelerating muons in the velocity range of v/c = 0.08-0.3, and compare their performance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA071  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPVA103 Design of Injector for Carbon Cancer Therapy rfq, ion, linac, ion-source 4704
 
  • A. Yamaguchi, K. Nakayama, K. Okaya, K. Sato, T. Takeuchi, J. Watanabe
    Toshiba, Yokohama, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  
  An Injector which consisted of a Radio Frequency Quadrupole (RFQ) and Drift Tube Linacs (DTLs) were designed for carbon cancer therapy system. An extraction energy of RFQ was 0.6 MeV/u, an extraction energy of DTLs was 4 MeV/u, frequency is 200MHz. To apply a compact solid-state power amplifier system, we designed one high-Q RFQ and two high-Q DTLs which had a triplet Quadrupole magnet between DTLs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA103  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)