IPAC2016 - List of Keywords (DTL)

Paper	Title	Other Keywords	Page
MOZB01	Construction and Beam Commissioning of CSNS Accelerators	dipole, quadrupole, linac, rfq	47
	S. Wang, S. Fu, J. Zhang IHEP, Beijing, People's Republic of China
	CSNS (China Spallation Neutron Source) is a proton accelerator based facility for delivering spallation neu-trons to users. The main components are 80-MeV linac, 1.6-GeV RCS and neutron production target. The con-struction began in 2011, and now construction of the building and accelerator components is well in progress. Most of the components have been tested and installed into the tunnel. The ion source and RFQ have been suc-cessfully commissioned. The first DTL tank has success-fully completed the beam commissioning, and the beam commissioning for the other three DTL tank will be per-formed before the end of 2016. The RCS commissioning will start in the beginning of 2017. This presentation provides a complete overview of the status of construc-tion and beam commissioning.
	Slides MOZB01 [11.853 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOZB01
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MOPMB056	Measurements of the Beam Energy and Beam Profile of 100 MeV Proton Linac at KOMAC	proton, linac, acceleration, ion	217
	S.G. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning. The linac for generation of the 100 MeV proton beam is operating in KOMAC. The 100 MeV proton beam is used in the industrial and the scientific fields such as improvement of the material characteristics and production of the isotope. The accurate measurements of the proton beam energy and profile are necessary for increasing the efficiency of the application and minimizing the inadequate radioactivation in linac structure caused by the beam loss. The proton beam energy and beam profile are measured by using the TOF (time-of-flight) method with a BPM (beam position monitor) and the ion chamber array, respectively. The detailed measurement setup and the measured results will be given in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB056
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MOPMR020	Beam Diagnostics for ESS Commissioning and Early Operation	linac, diagnostics, target, optics	273
	A. Jansson, M. Eshraqi, S. Molloy ESS, Lund, Sweden
	The ESS linac design has evolved over time and is now quite stable. Recently, there has been a focused effort on developing more detailed installation and commissioning plan, and related to this, the plans for diagnostics has also been reviewed. This paper presents the updated diagnos-tics suite. Many of diagnostics systems will be developed by in-kind partners across Europe.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR020
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MOPMR026	Beam Instrumentation Performance during Commissioning of CERN's Linac-4 to 50 MeV and 100 MeV	emittance, laser, linac, detector	293
	U. Raich, T. Hofmann, F. Roncarolo CERN, Geneva, Switzerland
	Linac-4, a 140 MeV H-linear accelerator is designed to replace the aging 50 MeV proton Linac. It will consist of an H-source and 45 keV LEBT, an RFQ and 3 MeV MEBT with a chopper, 3 drift tube linac (DTL) tanks accelerating the beam to 12, 30 and 50 Mev, cavity coupled structures (CCDTL) accelerating it to 100 MeV and a pi mode structure bringing it to its design energy of 160 MeV. This paper reports on the commissioning of the DTL and CCDTL with 2 dedicated temporary measurement lines, the first one adapted to the 12 MeV beam while the second one is dedicated to characterize the 50 MeV and the 100 MeV beams. The beam diagnostic devices used in these lines is described as well as results obtained.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR026
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MOPMW014	Design of the 7MeV Linac Injector for the 200MeV Synchrotron of the Xi'an Proton Application Facility	linac, rfq, ion, synchrotron	426
	Q.Z. Xing, C. Cheng, C.T. Du, L. Du, T. Du, X. Guan, H. Jiang, C.-X. Tang, R. Tang, D. Wang, X.W. Wang, L. Wu, H.Y. Zhang, Q.Z. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China W.Q. Guan, Y. He, J. Li NUCTECH, Beijing, People's Republic of China B.C. Wang, Z.M. Wang, W.L. Yang, 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 design result of the 7 MeV linac which will inject the negative hydrogen ion beam to the downsteam synchrotron of the Xi‘an Proton Application Facility (XiPAF). This newly designed facility will be located in Xi'an city and provide the proton beam with the maximum energy of 230 MeV for the research of the single event effect. 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 output beam of the linac injector is designed with the peak current of 5 mA, maximum repetition frequency of 0.5 Hz, beam pulse width of 10~40 μs and RMS normalized emittance of 0.24 π mm·mard.
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MOPMW019	Resonant Frequency Control with RCCS for the KOMAC Proton Linac	controls, LLRF, linac, proton	435
	D.H. Seo, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work is supported by the Ministry of Science, ICT & Future Planning of the Korean Government. The Resonance control cooling systems (RCCS) of 100 MeV proton linac at the Korea multi-purpose accelerator complex (KOMAC) have been operated for cooling the drift tubes (DT) and controlling the resonant frequency of the drift tube linac (DTL). The RCCS can maintain the cooling water temperature within ±0.1 °C by controlling 3-way valve opening. The RCCS has two types of control mode, the constant cooling water temperature control mode and the resonant frequency control mode. In the case of the resonant frequency control, the error frequency is measured in the low-level RF (LLRF) control system and the RCCS compensates the error frequency by controlling the cooling water temperature of DT with PID algorithm. In this paper, the operation results of the resonant frequency control with the RCCS as well as some modification of the LLRF system are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW019
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MOPMY005	Study of Pretuning and High Power Test of DTL Iris Waveguide Couplers Using a Single Cell Cavity	cavity, coupling, factory, simulation	522
	S.W. Lee, M.S. Champion, Y.W. Kang ORNL, Oak Ridge, Tennessee, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S.DOE. Six drift tube linac (DTL) cavities have been operating successfully at the Spallation Neutron Source (SNS). Each cavity is fed by a tapered ridge waveguide iris input coupler and a waveguide ceramic disk window. The original couplers and cavities have been in service for more than a decade. Design optimization and tuning of the couplers were initially performed prior to installation and commissioning of the cavities. Since each DTL cavity is unique, expensive, and fully utilized for neutron production, none of the cavity structure is available as a test cavity or a spare. Maintaining spares for operations and for future system upgrade, test setup of the iris couplers for precision tuning is needed. Ideally a smaller cavity structure may be used for pretuning and RF conditioning of the iris couplers as a test cavity or a bridge waveguide. In this paper, study of using a single cell cavity for the iris tuning and conditioning is presented along with the 3D simulation results.
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MOPMY023	High Power Test of the RF System for the KOMAC MEBT	LLRF, controls, FPGA, proton	552
	S.G. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea Y.G. Song KAERI, Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning) A 100 MeV proton linac of the Korea multi-purpose accelerator complex (KOMAC) has been operated for providing a proton beam to users. RF systems of two medium energy beam transports (MEBT) have been designed to improve a beam quality. An operating frequency of the MEBT RF system is 350 MHz, and the required RF power is 44 kW for MEBT-1 and 18 kW for MEBT-2. The RF duty is 9% (1.5 ms, 60 Hz), and an RF stability of ±1% in amplitude and ±1° in phase is required. The RF system includes a low-level RF (LLRF) control system, a solid state RF amplifier (SSPA) as a 60 kW SSPA for MEBT-1 and a 30 kW SSPA for MEBT-2, a coaxial circulator, and 3-1/8" coaxial line components. A RF power test to the MEBT has been performed with 4 kW SSPA before the full power operation. The configuration and high power test results of the MEBT RF system are presented in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY023
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MOPOR042	Beam Dynamics Modeling of Drift-tube Linacs with CST Particle Studio	simulation, rfq, linac, injection	689
	S.S. Kurennoy LANL, Los Alamos, New Mexico, USA
	The CST Studio provides convenient tools for self-consistent 3D modeling of accelerators, even large ones. Here we demonstrate this approach for the LANSCE drift-tube linac (DTL) taken as an example. The RF fields in 3D models of full DTL tanks are calculated and tuned with MicroWave Studio (MWS). Beam dynamics in the DTL is modeled with Particle Studio for bunches and bunch trains with realistic initial beam distributions using the MWS-calculated RF fields and quadrupole magnetic fields. The output beam parameters and locations of particle losses are calculated and compared for different beam distributions. Our main emphasis is on the formation of low-energy tails (longitudinal halo) and their interaction with regular bunches. Such effects are usually not taken into account in standard multi-particle phase-space codes.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR042
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MOPOY017	Upgrade of the Universal Linear Accelerator UNILAC for FAIR	ion, emittance, rfq, operation	880
	L. Groening, A. Adonin, X. Du, R. Hollinger, E. Jäger, M.T. Maier, S. Mickat, A. Rubin, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao, A. Yakushev, C. Zhang GSI, Darmstadt, Germany M. Baschke, H. Hähnel, H. Podlech, U. Ratzinger, A. Seibel, R. Tiede IAP, Frankfurt am Main, Germany Ch.E. Düllmann, P. Scharrer HIM, Mainz, Germany
	In order to meet the requirements on beam parameters for the upcoming FAIR facility at GSI, the injector linac UNILAC will be upgraded. The activities comprise development of the sources for stable provision of intense uranium beams at a repetition rate of 2.7 Hz, a revision of the beam dynamics layout of the 120 keV/u RFQ, the replacement of the matching section to the 1.4 MeV/u pre-stripper DTL, and enhancement of the gaseous stripping section efficiency. This section shall also include a round-to-flat emittance adaptor to prepare the beam for injection into the synchrotron SIS18 which has a flat transverse injection acceptance. Finally, the upgrade includes the complete replacement of the 40 year old 11.4 MeV/u Alvarez-type post-stripper DTL with a new DTL, preferably using Alvarez-type cavities with improved beam focusing features, as well as its rf-power alimentations.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY017
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MOPOY018	The New RF Design of the 36 MHz-HSI-RFQ at GSI	rfq, multipole, brilliance, quadrupole	883
	M. Baschke, H. Podlech IAP, Frankfurt am Main, Germany L. Groening, S. Mickat, C. Zhang GSI, Darmstadt, Germany
	In Darmstadt / Germany the existing accelerator cite GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded to fulfill the requirements with respect for intensity and beam quality. In a first step the 9.2 m long 36 MHz-HSI-RFQ for high current beams will get new electrodes to reach the specific frequency, to allow a higher electric strength and to avoid unwanted multipole components. Therefor several simulations with CST MWS have been done. The parameters and results of the RF-design will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY018
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MOPOY026	Baseline Design of a Proton Linac for BNCT at OIST	rfq, neutron, linac, proton	906
	Y. Kondo, K. Hasegawa JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Higashi, H. Sugawara, M. Yoshioka OIST, Onna-son, Okinawa, Japan H. Kumada Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan S.-I. Kurokawa Cosylab, Tsukuba, Japan H. Matsumoto, F. Naito KEK, Ibaraki, Japan
	A new facility to develop a proton linac based neutron source for boron neutron capture therapy (BNCT) and various neutron science is planned at Okinawa institute of science and technology (OIST). This facility aims to develop a prototype system of the mass production model of BNCT systems as medical apparatus. The beam power and the beam energy at the neutron production target are assumed to about 60 kW and 10 MeV, respectively. The energy will be finally decided to optimize the ratio of necessary epi-thermal and other energy of neutron. If the energy is 10 MeV, 60 kW beam power can be achieved with a beam current of 30 mA and a duty factor of 20%. The linac consists of an ECR ion source, a two-solenoid-magnet LEBT, a four-vane RFQ, and an Alvarez DTL, which are very conventional as components of proton linac. To make the accelerator compact, we are considering to use a 400-MHz band resonant frequency. As a medical apparatus, it is required that the linac system is stable and operated easily without experts of accelerator. The design of proton linac is one of the most important issues in our development. In this paper, the baseline design of this OIST BNCT linac is described.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY026
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MOPOY028	Low Power RF Tuning of the CSNS DTL	cavity, linac, insertion, neutron	913
	H.C. Liu, Q. Chen, M.X. Fan, S. Fu, K.Y. Gong, A.H. Li, J. Peng, S. Wang, X. Wu, F.X. Zhao IHEP, Beijing, People's Republic of China B. Li, P.H. Qu, Y. Wang CSNS, Guangdong Province, People's Republic of China
	The China Spallation Neutron Source (CSNS) is an accelerator-based neutron source being built at dongguan, Guangdong province in China. A conventional 324MHz Alvarez-type Drift tube linac (DTL) is utilized to accelerate an H⁻ ion beam from 3MeV to 80MeV. The RF field tuning of DTL is necessary for compensating the unexpected error caused by manufacturing and assembling. For reasons of RF power saving it is convenient to build a long DTL tank, but this choice involves risks of accelerating field instability. This problem can be fixed by using the resonant coupling stabilization method and equipping DTL cavities with a series of post-couplers. A practical tuning method was proposed, an acceptable field distribution with a good stability was achieved for CSNS DTL-1.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY028
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MOPOY045	ESS Linac Beam Physics Design Update	linac, rfq, proton, target	947
	M. Eshraqi, H. Danared, R. De Prisco, A. Jansson, Y.I. Levinsen, M. Lindroos, R. Miyamoto, M. Muñoz, A. Ponton ESS, Lund, Sweden
	The European Spallation Source, ESS, uses a linear accelerator to bombard the tungsten target with the high intensity protons beam for producing intense beams of neutrons. The nominal average beam power of the linac is 5~MW with a peak beam power at target of 125~MW. This paper focuses on the beam dynamics design of the ESS linac and the diagnostics elements used for the tuning of the lattice and matching between sections.
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MOPOY047	Studies of Ultimate Intensity Limits for High Power Proton Linacs	linac, proton, rfq, emittance	951
	D.C. Plostinar, C.R. Prior, G.H. Rees STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom M.O. Boenig, A.E. Geisler, O. Heid Siemens AG, Erlangen, Germany I.V. Konoplev, A. Seryi, S.L. Sheehy JAI, Oxford, United Kingdom
	Although modern high power proton machines can now routinely deliver MW level operating powers, the next generation accelerators will be required to reach powers orders of magnitude higher. Significant developments will be needed both in technology and in understanding the limits of high intensity operation. The present study investigates the beam dynamics in three experimental linac designs when the beam intensity is increased above current levels such that for CW regimes, beam powers of up to 400 MW can be attained. In the first, a 1 A proton beam is accelerated to 400 MeV using normal conducting structures. In the second, a comparison is made when two front ends accelerate 0.5 A beams to ~20 MeV where they are funnelled to 1 A and accelerated to 400 MeV. Similarly, in the third, two 0.25 A beams are funnelled to 0.5 A and then accelerated in superconducting structures to 800 MeV. In addition, alternative unconventional methods of generating high current beams are also discussed. The further studies that are needed to be undertaken in the future are outlined, but it is considered that the three linac configurations found are sufficiently promising for detailed technical designs to follow.
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TUOAA01	Operation of LANSCE Linear Accelerator with Double Pulse Rate and Low Beam Losses	beam-losses, linac, proton, operation	1004
	Y.K. Batygin, J.S. Kolski, R.C. McCrady, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by US DOE under contract DE-AC52-06NA25396 In 2014 LANSCE accelerator facility return to 120 Hz pulse rate operation after long period of operation at 60 Hz pulse rate. Increased capabilities require careful tuning of all components of linear accelerator. Transformation to double pulse rate resulted in re-evaluation of tuning procedures in order to meet new challenges in beam operation. The paper summarizes experimental activity on sustaining of high productivity of accelerator facility while keeping beam losses along accelerator at the low level.
	Slides TUOAA01 [14.886 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOAA01
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TUPMB008	Beam-Based Alignment for the Transport Line of CSNS	alignment, controls, experiment, linac	1121
	Y. Li, Y.W. An, Z.P. Li, W.B. Liu, S. Wang IHEP, Beijing, People's Republic of China
	Beam-based alignment (BBA) techniques are important tools for beam orbit steering in linear accelerators or transfer lines. In this paper this technique and the control system application programs developed based on XAL platform were applied to the beam commissioning for Medium Energy Beam Transport (MEBT) of CSNS to get the transverse misalignments of beam position monitor (BPM) and quad. The results shows that the absolute values of BPMs offsets are less than 0.6 mm and quads offsets are less than 0.05 mm，that is much smaller than the tolerance of the misalignment.
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TUPMB009	Vibrating Wire Measurements for the XiPAF Permanent Magnet Quadrupoles	multipole, background, experiment, permanent-magnet	1124
	B.C. Wang, M.T. Qiu, Z.M. Wang State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China C.T. Du, X.W. Wang, L. Wu, Q.Z. Xing, S.X. Zheng TUB, Beijing, People's Republic of China
	Vibrating wire technique is a promising measure-ment method for small-aperture Permanent Magnet Quadrupoles (PMQs) in linear accelerators and scan-ning nuclear microprobes. In this paper, we describe the improved vibrating wire setup for measuring an individual PMQ with the minimum aperture of several millimeters. This setup is aiming at measuring the magnetic center. The advantage of this setup is that any mechanical measurement on the wire, which may be the main error source, is avoided. Experiments of the 20 mm-aperture Halbach-type PMQs for Xi'an Proton Application Facility (XiPAF) DTL has been carried out. The research results of the magnetic center measurements show a precision of about 10 μm and robustness against the background magnetic field. Results of the magnetic center and field multipoles measurements agree with the ones obtained from the rotating coil.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB009
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TUPMY002	APF IH-DTL Design for the Muon LINAC in the J-PARC Muon g-2/EDM Experiment	cavity, linac, emittance, acceleration	1539
	M. Otani, T. Mibe, M. Yoshida KEK, Tsukuba, Japan K. Hasegawa, Y. Kondo JAEA, Ibaraki-ken, Japan N. Hayashizaki RLNR, Tokyo, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan Y. Iwata NIRS, Chiba-shi, Japan R. Kitamura University of Tokyo, Tokyo, Japan N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	The muon linac for the J-PARC muon g-2/EDM experiment consists of RFQ (324 MHz), IH-DTL (324 MHz), DAW coupled cell linac (1.3 GHz), and disk loaded structure (1.3 GHz). Because muon has finite life time, the muons should be accelerated in a sufficiently short period. To realize fast acceleration, Alternative Phase Focusing (APF) scheme is adopted in IH-DTL in which the muons are accelerated from 0.34 MeV to about 4 MeV. In this poster, the design of the APF IH-DTL for muon acceleraiton with the computer calculation will be presented.
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WEPMB008	ESS DTL Mechanical Design and Prototyping.	simulation, vacuum, linac, dipole	2131
	P. Mereu, M. Mezzano INFN-Torino, Torino, Italy D. Castronovo, R. Visintini Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy F. Grespan, A. Pisent, M. Poggi, C. R. Roncolato 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 DTL mechanical design and simulations are presented, together with the results obtained from the prototypes of three drift tubes, equipped respectively with Permanent Magnet Quadrupole, Steerer and Beam Position Monitor.
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THPMB032	Design Study and Multi-particle Tracking Simulation of the IH-DTL with KONUS Beam Dynamics for KHIMA Project	simulation, quadrupole, acceleration, emittance	3299
	Y. Lee, E.-S. Kim Korea University Sejong Campus, Sejong, Republic of Korea G. Hahn KIRAMS, Seoul, Republic of Korea Z. Li SCU, Chengdu, People's Republic of China
	The Korea Heavy Ion Medical Accelerator (KHIMA) project of the Korea Institute of Radiological and Medical Sciences (KIRAMS) has developed heavy ion medical accelerator. The injector system of the accelerator for the KHIMA project is composed of a low energy beam transport line (LEBT), radio frequency quadrupole (RFQ), interdigit H-mode drift tube linac (IH-DTL), and medium energy beam transport line (MEBT). The IH-DTL is designed with KONUS beam dynamics, and KONUS indicates a combined 0˚ structure. Optimization aims are to increase the quality of the beam and to reduce the beam loss. KONUS beam dynamics design and multi-particle tracking simulations of the IH-DTL with LORASR and TraceWIN code are performed.
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THPMW027	Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology	klystron, high-voltage, linac, operation	3600
	C.A. Martins ESS, Lund, Sweden M. Collins, A. Reinap Lund Technical University, Lund, Sweden
	A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW027
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Paper

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Other Keywords

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MOZB01

Construction and Beam Commissioning of CSNS Accelerators

dipole, quadrupole, linac, rfq

47

S. Wang, S. Fu, J. Zhang
IHEP, Beijing, People's Republic of China

CSNS (China Spallation Neutron Source) is a proton accelerator based facility for delivering spallation neu-trons to users. The main components are 80-MeV linac, 1.6-GeV RCS and neutron production target. The con-struction began in 2011, and now construction of the building and accelerator components is well in progress. Most of the components have been tested and installed into the tunnel. The ion source and RFQ have been suc-cessfully commissioned. The first DTL tank has success-fully completed the beam commissioning, and the beam commissioning for the other three DTL tank will be per-formed before the end of 2016. The RCS commissioning will start in the beginning of 2017. This presentation provides a complete overview of the status of construc-tion and beam commissioning.

Slides MOZB01 [11.853 MB]

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MOPMB056

Measurements of the Beam Energy and Beam Profile of 100 MeV Proton Linac at KOMAC

proton, linac, acceleration, ion

217

S.G. Lee, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science, ICT and Future Planning.
The linac for generation of the 100 MeV proton beam is operating in KOMAC. The 100 MeV proton beam is used in the industrial and the scientific fields such as improvement of the material characteristics and production of the isotope. The accurate measurements of the proton beam energy and profile are necessary for increasing the efficiency of the application and minimizing the inadequate radioactivation in linac structure caused by the beam loss. The proton beam energy and beam profile are measured by using the TOF (time-of-flight) method with a BPM (beam position monitor) and the ion chamber array, respectively. The detailed measurement setup and the measured results will be given in this paper.

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MOPMR020

Beam Diagnostics for ESS Commissioning and Early Operation

linac, diagnostics, target, optics

273

A. Jansson, M. Eshraqi, S. Molloy
ESS, Lund, Sweden

The ESS linac design has evolved over time and is now quite stable. Recently, there has been a focused effort on developing more detailed installation and commissioning plan, and related to this, the plans for diagnostics has also been reviewed. This paper presents the updated diagnos-tics suite. Many of diagnostics systems will be developed by in-kind partners across Europe.

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MOPMR026

Beam Instrumentation Performance during Commissioning of CERN's Linac-4 to 50 MeV and 100 MeV

emittance, laser, linac, detector

293

U. Raich, T. Hofmann, F. Roncarolo
CERN, Geneva, Switzerland

Linac-4, a 140 MeV H-linear accelerator is designed to replace the aging 50 MeV proton Linac. It will consist of an H-source and 45 keV LEBT, an RFQ and 3 MeV MEBT with a chopper, 3 drift tube linac (DTL) tanks accelerating the beam to 12, 30 and 50 Mev, cavity coupled structures (CCDTL) accelerating it to 100 MeV and a pi mode structure bringing it to its design energy of 160 MeV. This paper reports on the commissioning of the DTL and CCDTL with 2 dedicated temporary measurement lines, the first one adapted to the 12 MeV beam while the second one is dedicated to characterize the 50 MeV and the 100 MeV beams. The beam diagnostic devices used in these lines is described as well as results obtained.

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MOPMW014

Design of the 7MeV Linac Injector for the 200MeV Synchrotron of the Xi'an Proton Application Facility

linac, rfq, ion, synchrotron

426

Q.Z. Xing, C. Cheng, C.T. Du, L. Du, T. Du, X. Guan, H. Jiang, C.-X. Tang, R. Tang, D. Wang, X.W. Wang, L. Wu, H.Y. Zhang, Q.Z. Zhang, S.X. Zheng
TUB, Beijing, People's Republic of China
W.Q. Guan, Y. He, J. Li
NUCTECH, Beijing, People's Republic of China
B.C. Wang, Z.M. Wang, W.L. Yang, 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 design result of the 7 MeV linac which will inject the negative hydrogen ion beam to the downsteam synchrotron of the Xi‘an Proton Application Facility (XiPAF). This newly designed facility will be located in Xi'an city and provide the proton beam with the maximum energy of 230 MeV for the research of the single event effect. 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 output beam of the linac injector is designed with the peak current of 5 mA, maximum repetition frequency of 0.5 Hz, beam pulse width of 10~40 μs and RMS normalized emittance of 0.24 π mm·mard.

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MOPMW019

Resonant Frequency Control with RCCS for the KOMAC Proton Linac

controls, LLRF, linac, proton

435

D.H. Seo, Y.-S. Cho, H.S. Kim, H.-J. Kwon, K.T. Seol, Y.G. Song
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work is supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
The Resonance control cooling systems (RCCS) of 100 MeV proton linac at the Korea multi-purpose accelerator complex (KOMAC) have been operated for cooling the drift tubes (DT) and controlling the resonant frequency of the drift tube linac (DTL). The RCCS can maintain the cooling water temperature within ±0.1 °C by controlling 3-way valve opening. The RCCS has two types of control mode, the constant cooling water temperature control mode and the resonant frequency control mode. In the case of the resonant frequency control, the error frequency is measured in the low-level RF (LLRF) control system and the RCCS compensates the error frequency by controlling the cooling water temperature of DT with PID algorithm. In this paper, the operation results of the resonant frequency control with the RCCS as well as some modification of the LLRF system are presented.

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MOPMY005

Study of Pretuning and High Power Test of DTL Iris Waveguide Couplers Using a Single Cell Cavity

cavity, coupling, factory, simulation

522

S.W. Lee, M.S. Champion, Y.W. Kang
ORNL, Oak Ridge, Tennessee, USA

Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S.DOE.
Six drift tube linac (DTL) cavities have been operating successfully at the Spallation Neutron Source (SNS). Each cavity is fed by a tapered ridge waveguide iris input coupler and a waveguide ceramic disk window. The original couplers and cavities have been in service for more than a decade. Design optimization and tuning of the couplers were initially performed prior to installation and commissioning of the cavities. Since each DTL cavity is unique, expensive, and fully utilized for neutron production, none of the cavity structure is available as a test cavity or a spare. Maintaining spares for operations and for future system upgrade, test setup of the iris couplers for precision tuning is needed. Ideally a smaller cavity structure may be used for pretuning and RF conditioning of the iris couplers as a test cavity or a bridge waveguide. In this paper, study of using a single cell cavity for the iris tuning and conditioning is presented along with the 3D simulation results.

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MOPMY023

High Power Test of the RF System for the KOMAC MEBT

LLRF, controls, FPGA, proton

552

S.G. Kim, Y.-S. Cho, H.S. Kim, H.-J. Kwon
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
Y.G. Song
KAERI, Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC (Korea Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning)
A 100 MeV proton linac of the Korea multi-purpose accelerator complex (KOMAC) has been operated for providing a proton beam to users. RF systems of two medium energy beam transports (MEBT) have been designed to improve a beam quality. An operating frequency of the MEBT RF system is 350 MHz, and the required RF power is 44 kW for MEBT-1 and 18 kW for MEBT-2. The RF duty is 9% (1.5 ms, 60 Hz), and an RF stability of ±1% in amplitude and ±1° in phase is required. The RF system includes a low-level RF (LLRF) control system, a solid state RF amplifier (SSPA) as a 60 kW SSPA for MEBT-1 and a 30 kW SSPA for MEBT-2, a coaxial circulator, and 3-1/8" coaxial line components. A RF power test to the MEBT has been performed with 4 kW SSPA before the full power operation. The configuration and high power test results of the MEBT RF system are presented in this paper.

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MOPOR042

Beam Dynamics Modeling of Drift-tube Linacs with CST Particle Studio

simulation, rfq, linac, injection

689

S.S. Kurennoy
LANL, Los Alamos, New Mexico, USA

The CST Studio provides convenient tools for self-consistent 3D modeling of accelerators, even large ones. Here we demonstrate this approach for the LANSCE drift-tube linac (DTL) taken as an example. The RF fields in 3D models of full DTL tanks are calculated and tuned with MicroWave Studio (MWS). Beam dynamics in the DTL is modeled with Particle Studio for bunches and bunch trains with realistic initial beam distributions using the MWS-calculated RF fields and quadrupole magnetic fields. The output beam parameters and locations of particle losses are calculated and compared for different beam distributions. Our main emphasis is on the formation of low-energy tails (longitudinal halo) and their interaction with regular bunches. Such effects are usually not taken into account in standard multi-particle phase-space codes.

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MOPOY017

Upgrade of the Universal Linear Accelerator UNILAC for FAIR

ion, emittance, rfq, operation

880

L. Groening, A. Adonin, X. Du, R. Hollinger, E. Jäger, M.T. Maier, S. Mickat, A. Rubin, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao, A. Yakushev, C. Zhang
GSI, Darmstadt, Germany
M. Baschke, H. Hähnel, H. Podlech, U. Ratzinger, A. Seibel, R. Tiede
IAP, Frankfurt am Main, Germany
Ch.E. Düllmann, P. Scharrer
HIM, Mainz, Germany

In order to meet the requirements on beam parameters for the upcoming FAIR facility at GSI, the injector linac UNILAC will be upgraded. The activities comprise development of the sources for stable provision of intense uranium beams at a repetition rate of 2.7 Hz, a revision of the beam dynamics layout of the 120 keV/u RFQ, the replacement of the matching section to the 1.4 MeV/u pre-stripper DTL, and enhancement of the gaseous stripping section efficiency. This section shall also include a round-to-flat emittance adaptor to prepare the beam for injection into the synchrotron SIS18 which has a flat transverse injection acceptance. Finally, the upgrade includes the complete replacement of the 40 year old 11.4 MeV/u Alvarez-type post-stripper DTL with a new DTL, preferably using Alvarez-type cavities with improved beam focusing features, as well as its rf-power alimentations.

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MOPOY018

The New RF Design of the 36 MHz-HSI-RFQ at GSI

rfq, multipole, brilliance, quadrupole

883

M. Baschke, H. Podlech
IAP, Frankfurt am Main, Germany
L. Groening, S. Mickat, C. Zhang
GSI, Darmstadt, Germany

In Darmstadt / Germany the existing accelerator cite GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded to fulfill the requirements with respect for intensity and beam quality. In a first step the 9.2 m long 36 MHz-HSI-RFQ for high current beams will get new electrodes to reach the specific frequency, to allow a higher electric strength and to avoid unwanted multipole components. Therefor several simulations with CST MWS have been done. The parameters and results of the RF-design will be presented.

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MOPOY026

Baseline Design of a Proton Linac for BNCT at OIST

rfq, neutron, linac, proton

906

Y. Kondo, K. Hasegawa
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Higashi, H. Sugawara, M. Yoshioka
OIST, Onna-son, Okinawa, Japan
H. Kumada
Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan
S.-I. Kurokawa
Cosylab, Tsukuba, Japan
H. Matsumoto, F. Naito
KEK, Ibaraki, Japan

A new facility to develop a proton linac based neutron source for boron neutron capture therapy (BNCT) and various neutron science is planned at Okinawa institute of science and technology (OIST). This facility aims to develop a prototype system of the mass production model of BNCT systems as medical apparatus. The beam power and the beam energy at the neutron production target are assumed to about 60 kW and 10 MeV, respectively. The energy will be finally decided to optimize the ratio of necessary epi-thermal and other energy of neutron. If the energy is 10 MeV, 60 kW beam power can be achieved with a beam current of 30 mA and a duty factor of 20%. The linac consists of an ECR ion source, a two-solenoid-magnet LEBT, a four-vane RFQ, and an Alvarez DTL, which are very conventional as components of proton linac. To make the accelerator compact, we are considering to use a 400-MHz band resonant frequency. As a medical apparatus, it is required that the linac system is stable and operated easily without experts of accelerator. The design of proton linac is one of the most important issues in our development. In this paper, the baseline design of this OIST BNCT linac is described.

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MOPOY028

Low Power RF Tuning of the CSNS DTL

cavity, linac, insertion, neutron

913

H.C. Liu, Q. Chen, M.X. Fan, S. Fu, K.Y. Gong, A.H. Li, J. Peng, S. Wang, X. Wu, F.X. Zhao
IHEP, Beijing, People's Republic of China
B. Li, P.H. Qu, Y. Wang
CSNS, Guangdong Province, People's Republic of China

The China Spallation Neutron Source (CSNS) is an accelerator-based neutron source being built at dongguan, Guangdong province in China. A conventional 324MHz Alvarez-type Drift tube linac (DTL) is utilized to accelerate an H⁻ ion beam from 3MeV to 80MeV. The RF field tuning of DTL is necessary for compensating the unexpected error caused by manufacturing and assembling. For reasons of RF power saving it is convenient to build a long DTL tank, but this choice involves risks of accelerating field instability. This problem can be fixed by using the resonant coupling stabilization method and equipping DTL cavities with a series of post-couplers. A practical tuning method was proposed, an acceptable field distribution with a good stability was achieved for CSNS DTL-1.

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MOPOY045

ESS Linac Beam Physics Design Update

linac, rfq, proton, target

947

M. Eshraqi, H. Danared, R. De Prisco, A. Jansson, Y.I. Levinsen, M. Lindroos, R. Miyamoto, M. Muñoz, A. Ponton
ESS, Lund, Sweden

The European Spallation Source, ESS, uses a linear accelerator to bombard the tungsten target with the high intensity protons beam for producing intense beams of neutrons. The nominal average beam power of the linac is 5~MW with a peak beam power at target of 125~MW. This paper focuses on the beam dynamics design of the ESS linac and the diagnostics elements used for the tuning of the lattice and matching between sections.

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MOPOY047

Studies of Ultimate Intensity Limits for High Power Proton Linacs

linac, proton, rfq, emittance

951

D.C. Plostinar, C.R. Prior, G.H. Rees
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
M.O. Boenig, A.E. Geisler, O. Heid
Siemens AG, Erlangen, Germany
I.V. Konoplev, A. Seryi, S.L. Sheehy
JAI, Oxford, United Kingdom

Although modern high power proton machines can now routinely deliver MW level operating powers, the next generation accelerators will be required to reach powers orders of magnitude higher. Significant developments will be needed both in technology and in understanding the limits of high intensity operation. The present study investigates the beam dynamics in three experimental linac designs when the beam intensity is increased above current levels such that for CW regimes, beam powers of up to 400 MW can be attained. In the first, a 1 A proton beam is accelerated to 400 MeV using normal conducting structures. In the second, a comparison is made when two front ends accelerate 0.5 A beams to ~20 MeV where they are funnelled to 1 A and accelerated to 400 MeV. Similarly, in the third, two 0.25 A beams are funnelled to 0.5 A and then accelerated in superconducting structures to 800 MeV. In addition, alternative unconventional methods of generating high current beams are also discussed. The further studies that are needed to be undertaken in the future are outlined, but it is considered that the three linac configurations found are sufficiently promising for detailed technical designs to follow.

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TUOAA01

Operation of LANSCE Linear Accelerator with Double Pulse Rate and Low Beam Losses

beam-losses, linac, proton, operation

1004

Y.K. Batygin, J.S. Kolski, R.C. McCrady, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by US DOE under contract DE-AC52-06NA25396
In 2014 LANSCE accelerator facility return to 120 Hz pulse rate operation after long period of operation at 60 Hz pulse rate. Increased capabilities require careful tuning of all components of linear accelerator. Transformation to double pulse rate resulted in re-evaluation of tuning procedures in order to meet new challenges in beam operation. The paper summarizes experimental activity on sustaining of high productivity of accelerator facility while keeping beam losses along accelerator at the low level.

Slides TUOAA01 [14.886 MB]

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TUPMB008

Beam-Based Alignment for the Transport Line of CSNS

alignment, controls, experiment, linac

1121

Y. Li, Y.W. An, Z.P. Li, W.B. Liu, S. Wang
IHEP, Beijing, People's Republic of China

Beam-based alignment (BBA) techniques are important tools for beam orbit steering in linear accelerators or transfer lines. In this paper this technique and the control system application programs developed based on XAL platform were applied to the beam commissioning for Medium Energy Beam Transport (MEBT) of CSNS to get the transverse misalignments of beam position monitor (BPM) and quad. The results shows that the absolute values of BPMs offsets are less than 0.6 mm and quads offsets are less than 0.05 mm，that is much smaller than the tolerance of the misalignment.

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TUPMB009

Vibrating Wire Measurements for the XiPAF Permanent Magnet Quadrupoles

multipole, background, experiment, permanent-magnet

1124

B.C. Wang, M.T. Qiu, Z.M. Wang
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
C.T. Du, X.W. Wang, L. Wu, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People's Republic of China

Vibrating wire technique is a promising measure-ment method for small-aperture Permanent Magnet Quadrupoles (PMQs) in linear accelerators and scan-ning nuclear microprobes. In this paper, we describe the improved vibrating wire setup for measuring an individual PMQ with the minimum aperture of several millimeters. This setup is aiming at measuring the magnetic center. The advantage of this setup is that any mechanical measurement on the wire, which may be the main error source, is avoided. Experiments of the 20 mm-aperture Halbach-type PMQs for Xi'an Proton Application Facility (XiPAF) DTL has been carried out. The research results of the magnetic center measurements show a precision of about 10 μm and robustness against the background magnetic field. Results of the magnetic center and field multipoles measurements agree with the ones obtained from the rotating coil.

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TUPMY002

APF IH-DTL Design for the Muon LINAC in the J-PARC Muon g-2/EDM Experiment

cavity, linac, emittance, acceleration

1539

M. Otani, T. Mibe, M. Yoshida
KEK, Tsukuba, Japan
K. Hasegawa, Y. Kondo
JAEA, Ibaraki-ken, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
Y. Iwata
NIRS, Chiba-shi, Japan
R. Kitamura
University of Tokyo, Tokyo, Japan
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

The muon linac for the J-PARC muon g-2/EDM experiment consists of RFQ (324 MHz), IH-DTL (324 MHz), DAW coupled cell linac (1.3 GHz), and disk loaded structure (1.3 GHz). Because muon has finite life time, the muons should be accelerated in a sufficiently short period. To realize fast acceleration, Alternative Phase Focusing (APF) scheme is adopted in IH-DTL in which the muons are accelerated from 0.34 MeV to about 4 MeV. In this poster, the design of the APF IH-DTL for muon acceleraiton with the computer calculation will be presented.

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WEPMB008

ESS DTL Mechanical Design and Prototyping.

simulation, vacuum, linac, dipole

2131

P. Mereu, M. Mezzano
INFN-Torino, Torino, Italy
D. Castronovo, R. Visintini
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
F. Grespan, A. Pisent, M. Poggi, C. R. Roncolato
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 DTL mechanical design and simulations are presented, together with the results obtained from the prototypes of three drift tubes, equipped respectively with Permanent Magnet Quadrupole, Steerer and Beam Position Monitor.

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THPMB032

Design Study and Multi-particle Tracking Simulation of the IH-DTL with KONUS Beam Dynamics for KHIMA Project

simulation, quadrupole, acceleration, emittance

3299

Y. Lee, E.-S. Kim
Korea University Sejong Campus, Sejong, Republic of Korea
G. Hahn
KIRAMS, Seoul, Republic of Korea
Z. Li
SCU, Chengdu, People's Republic of China

The Korea Heavy Ion Medical Accelerator (KHIMA) project of the Korea Institute of Radiological and Medical Sciences (KIRAMS) has developed heavy ion medical accelerator. The injector system of the accelerator for the KHIMA project is composed of a low energy beam transport line (LEBT), radio frequency quadrupole (RFQ), interdigit H-mode drift tube linac (IH-DTL), and medium energy beam transport line (MEBT). The IH-DTL is designed with KONUS beam dynamics, and KONUS indicates a combined 0˚ structure. Optimization aims are to increase the quality of the beam and to reduce the beam loss. KONUS beam dynamics design and multi-particle tracking simulations of the IH-DTL with LORASR and TraceWIN code are performed.

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THPMW027

Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology

klystron, high-voltage, linac, operation

3600

C.A. Martins
ESS, Lund, Sweden
M. Collins, A. Reinap
Lund Technical University, Lund, Sweden

A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality

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