LINAC2016 - List of Keywords (target)

Paper	Title	Other Keywords	Page
MOPRC007	Status of and Plans for the Beam Dynamics Program DYNAC	rfq, space-charge, beam-transport, proton	80
	E. Tanke, M. Eshraqi, Y.I. Levinsen, A. Ponton ESS, Lund, Sweden S. Valero CEA, Gif-sur-Yvette, France
	A short introduction to the linac beam dynamics code DYNAC will be given. Recently implemented features, such as a Graphical User Interface (GUI), will be presented and benchmarking of the Radio Frequency Quadrupole (RFQ) model will be discussed. Additional planned features to DYNAC and the GUI will be touched upon.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC007
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MOPRC008	Dispersion Free and Dispersion Target Steering Experience at CTF3	linac, optics, quadrupole, dipole	83
	D. Gamba, R. Corsini, T. Persson, P.K. Skowroński, F. Tecker CERN, Geneva, Switzerland P. Burrows Oxford University, Physics Department, Oxford, Oxon, United Kingdom P. Burrows JAI, Oxford, United Kingdom
	One of the goals of the CLIC Test Facility (CTF3) at CERN is to demonstrate the feasibility of the CLIC Drive Beam recombination, which takes place in the Drive Beam Recombination Complex (DBRC). The tight geometry of the DBRC together with its strong optics and the high energy-spread of the beam require a careful control of the beam size along the different sections of the DBRC. One of the main contribution to beam size is the dispersion. If uncontrolled, dispersion leads to fast increase of the beam size, hence it may affect the beam current stability of the combined beam. A tool has been implemented at CTF3 to measure and correct dispersion during and after the setup of the machine. Dispersion Free Steering (DFS) has been applied in the upstream drive beam LINAC, while Dispersion Target Steering (DTS) has been used in the rings of the DBRC. In the LINAC the weak optics and the wide dynamic aperture of the beamline allow a straightforward correction. In the DBRC the aperture is tighter, and the strong optics produce non-linear dispersion which one needs to take into account. A general overview of current status and future plans in controlling dispersion at CTF3 will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC008
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MOPRC017	CIADS HEBT Lattice Design	vacuum, collimation, lattice, emittance	108
	Y.S. Qin IMP/CAS, Lanzhou, People's Republic of China
	Funding: I want to apply for financial support. CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target.
	Poster MOPRC017 [1.273 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC017
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MOPLR039	Development of New Type "Ninja" Cathode for Nb 9-cell Cavity and Experiment of Vertical Electro-Polishing	cavity, cathode, experiment, collider	223
	K.N. Nii, V. Chouhan, Y.I. Ida, T.Y. Yamaguchi MGH, Hyogo-ken, Japan H. Hayano, S. Kato, H. Monjushiro, T. Saeki, M. Sawabe KEK, Ibaraki, Japan K. Ishimi MGI, Chiba, Japan
	Marui Galvanizing Co. Ltd. has been improving Vertical Electro-Polishing (VEP) technologies and facilities for Nb 9-cell superconducting accelerator cavity for International Linear Collider (ILC) in collaboration with KEK. This time, we developed new type 'Ninja' cathode in order to improve VEP uniformity of Nb 9-cell cavity inner surface based on the results of 1-cell cavity VEP experiment. In this article, we will report construction of new type "Ninja" cathode for Nb 9-cell cavity and experiment of VEP using this.
	Poster MOPLR039 [0.610 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR039
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MOPLR047	Advanced Vertical Electro-Polishing studies at Cornell with Faraday	cavity, SRF, niobium, status	233
	F. Furuta, M. Ge, T. Gruber, G.H. Hoffstaetter, J.J. Kaufman, M. Liepe, J. Sears Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA T.D. Hall, M.E. Inman, S.T. Snyder, E.J. Taylor Faraday Technology, Inc., Clayton, Ohio, USA
	Cornell's SRF group and Faraday Technology Inc. have started collaborations on two phase-II SBIR projects. Both projects are aiming for the development of advanced Vertical Electro-Polishing (VEP) for Nb SRF cavities, such as HF free or acid free VEP protocols. These could be eco-friendlier alternatives for the standard, HF-based EP electrolyte used, and could bring new breakthrough performance for Nb SRF cavities. Here we give a status update and report first results from these two projects.
	Poster MOPLR047 [2.852 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR047
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MOPLR051	Simulation of Gas and Plasma Charge Strippers	plasma, electron, ion, heavy-ion	248
	O.S.H. Haas, O. Boine-Frankenheim TEMF, TU Darmstadt, Darmstadt, Germany
	Funding: This work is supported by the BMBF as part of project 05P15RDRBA. Charge stripping of intense heavy ion beams is a major challenge in current and future linear heavy ion accelerators. Conventional stripping techniques are limited in their applicability, e.g. solid carbon foils suffer from short lifetimes at high intensities. One possible alternative is the use of a plasma as a stripping medium, which the presented work focuses on. The main goal of the studies is the prediction of the final charge state distribution of the ion beam. Rate equations were implemented numerically, taking into account different models for ionization, recombination and energy loss processes. First quantitative results are presented in form of an overview of the charge state distributions of different charge stripping media. For fixed projectile properties and target phase, it is observed that the mean charge state q₀ decreases for increasing nuclear charge Z_\text{T} of the target. Plasmas show significantly increased q₀ for the same Z_T. The width d of the charge state distributions is larger for higher Z_\text{T}. The latter is caused by multiple loss of the projectile and decreases the maximum stripping efficiency by typically less than a factor of 2.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR051
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MOPLR061	Commissioning of the RI Production Beam Line of KOMAC	beam-transport, proton, isotope-production, linac	271
	H.-J. Kwon, Y.-S. Cho, H.S. Kim, Y.G. Song, S.P. Yun Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government. A radioisotope (RI) production beam line has been developed at Korea Multi-purpose Accelerator Complex (KOMAC) in 2015 and the commissioning started in 2016. The beam parameters of the beam line are 100-MeV beam energy with a maximum 30 kW beam power, which is driven by KOMAC 100-MeV proton linac. The main components of the beam line are a beam transport system, a target transport system, a cooling system for target and hot cell. KOMAC has a plan to commission the beam line and get an operational license in 2016 and start user service in 2017. In this paper, the development and initial commissioning results of the RI production beam line are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR061
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MOPLR072	The Effect of DTL Cavity Field Errors on Beam Spill at LANSCE	DTL, cavity, linac, LLRF	301
	L. Rybarcyk, R.C. McCrady LANL, Los Alamos, New Mexico, USA
	The Los Alamos Neutron Science Center (LANSCE) accelerator comprises two (H⁺ and H⁻) 750-keV Cockcroft-Walton style injectors, a 201.25-MHz, 100-MeV drift-tube linac (DTL) and an 805-MHz, 800-MeV coupled-cavity linac (CCL). As part of the LANSCE Risk Mitigation project a new digital low-level radio frequency (LLRF) control system is being deployed across the linac, starting with the DTL. Related to this upgrade, a study was performed where specific cavity field errors were simultaneously introduced in all DTL tanks about the nominal stable, low-spill, production set points to mimic LLRF control errors. The impact of these errors on the resultant beam spill was quantified for the nominal 100 μA, 800-MeV Lujan beam. We present the details of the measurement approach and results that show a rapid increase in total linac beam spill as DTL cavity field phase and amplitude errors are increased.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR072
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MOP106012	MESA - an ERL Project for Particle Physics Experiments	experiment, electron, operation, linac	313
	F. Hug, K. Aulenbacher, R.G. Heine, B. Ledroit, D. Simon IKP, Mainz, Germany
	The Mainz Energy-recovering Superconducting Accelerator (MESA) will be constructed at the Institut für Kernphysik of the Johannes Gutenberg University of Mainz. The accelerator is a low energy continuous wave (CW) recirculating electron linac for particle physics experiments. MESA will be operated in two different modes serving mainly two experiments: the first is the external beam (EB) mode, where the beam is dumped after being used with the external fixed target experiment P2, whose goal is the measurement of the weak mixing angle with highest accuracy. The required beam current for P2 is 150 μA with polarized electrons at 155 MeV. In the second operation mode MESA will be run as an energy recovery linac (ERL). The experiment served in this mode is a (pseudo) internal fixed target experiment named MAGIX. It demands an unpolarized beam of 1 mA at 10⁵ MeV. In a later construction stage of MESA the achievable beam current in ERL-mode shall be upgraded to 10 mA. Within this contribution an overview of the MESA project will be given highlighting the latest accelerator layout and the challenges of operation with high density internal gas targets. Work supported by DFG through cluster of excellence PRISMA, CRC 1044 and RTG 2128
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOP106012
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TUOP03	Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell	ion, emittance, heavy-ion, linac	387
	P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev HIM, Mainz, Germany W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev GSI, Darmstadt, Germany Ch.E. Düllmann, P. Scharrer Mainz University, Mainz, Germany
	The GSI UNILAC in combination with SIS18 will serve as a high-current, heavy-ion injector for the FAIR facility. It must meet high demands in terms of beam brilliance at a low duty factor. As part of an UNILAC upgrade program dedicated to FAIR, a new pulsed gas stripper cell was developed, aiming for increased beam intensities inside the post-stripper. The pulsed gas injection is synchronized with the beam pulse timing, enabling a highly-demanded, increased gas density. First tests using uranium beams on a hydrogen target showed a 60%-increased stripping efficiency into the desired 28+ charge state. In 2015, the setup was improved to be able to deliver increased target thicknesses and enhanced flexibility of the gas injection. In recent beam times, the pulsed gas cell was used with various ion-beam types, to test the capabilities for operation at the GSI UNILAC. The stripping of two ion beams in different gases at different gas densities was successfully tested in mixed-beam operation. Charge fractions, beam emittance, and energy-loss were systematically measured using uranium, bismuth, titanium, and argon beams on hydrogen, helium, and nitrogen targets. Selected results will be presented at the conference.
	Slides TUOP03 [1.131 MB]
	Poster TUOP03 [5.943 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP03
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TUPRC006	Phase-Space Transformation for a Uniform Target Irradiation at DONES	octupole, space-charge, neutron, simulation	424
	C. Oliver, A. Ibarra CIEMAT, Madrid, Spain P. Cara Fusion for Energy, Garching, Germany N. Chauvin CEA/DSM/IRFU, France A. Gallego Universidad Complutense Madrid, Madrid, Spain
	Funding: "This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053." In the framework of the EU Roadmap, a DEMO Oriented Neutron Source (DONES) [] has been proposed to provide a high neutron intense neutron source with a suitable neutron spectrum to understand the degradation of advanced materials under DEMO and future fusion plants irradiation conditions. DONES will be based on the International Fusion Materials Irradiation Facility IFMIF [], being only one accelerator considered. The HEBT will be devoted to the transport, bending and shaping of the 40 MeV, 125 mA CW deuteron beam to the free surface of the rapidly flowing lithium target. To produce a forward peaked source of fusion-like neutrons, which stream through the target into the test cell, a rectangular uniform distribution across the flat top of the beam profile is required, being the footprint tailored in both the vertical and horizontal directions according to the target design. Different methods for beam uniformization in IFMIF accelerator has been proposed in the past [*]. Two main concerns in DONES will be the minimization of particle losses over the whole HEBT and the effect of the different shaping techniques on such strong space charge regime, specially on the beam halo modulation. A review of the different methods for the beam shaping of the high power, high space charge DONES HEBT beam will be depicted. A final solution will be proposed. [] DONES Conceptual Design Report, April 2014 [] IFMIF Comprehensive Design Report, CDR, IFMIF International Team, January 2004 [*] IFMIF Intermediate Engineering Design Report
	Poster TUPRC006 [2.546 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC006
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TUPRC015	Final Acceptance Test of SRF Photo-Injector Cold String for the BERLinPro Energy Recovery Linac	cavity, cathode, SRF, gun	445
	A. Neumann, D. Böhlick, P. Echevarria, A. Frahm, F. Göbel, T. Kamps, J. Knobloch, O. Kugeler, M. Schuster, J. Ullrich, A. Ushakov HZB, Berlin, Germany A. Burrill SLAC, Menlo Park, California, USA G. Ciovati, P. Kneisel JLab, Newport News, Virginia, USA A. Matheisen, M. Schalwat, M. Schmökel DESY, Hamburg, Germany E.N. Zaplatin FZJ, Jülich, Germany
	Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association. Helmholtz-Zentrum Berlin (HZB) is currently designing and building an high average current all superconducting CW driven ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100mA and short pulses of about 2 ps. In order to achieve these demanding goals HZB started a staged program for developing this class of required high current, high brightness SRF electron sources. In this contribution we will present the current status of the module assembly and testing of the prototype SRF photo-injector cavity cold string. The steps taken to install the cathode insert system with the cavity in the cleanroom and the following horizontal test of the cold string as final acceptance test prior installation into its cryostat are shown. First beam in a dedicated diagnostics teststand called Gunlab are planned for this winter.
	Poster TUPRC015 [2.077 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC015
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TUPRC020	The TRIUMF ARIEL RF Modulated Thermionic Electron Source	electron, cathode, emittance, TRIUMF	458
	F. Ames, Y.-C. Chao, K. Fong, N. Khan, S.R. Koscielniak, A. Laxdal, L. Merminga, T. Planche, S. Saminathan, D.W. Storey TRIUMF, Vancouver, Canada Y.-C. Chao, L. Merminga SLAC, Menlo Park, California, USA C.K. Sinclair Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: ARIEL is funded by the Canada Foundation for Innovation, the Provinces AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives funding via a contribution agreement with the National Research Council of Canada Within the ARIEL (Advanced Rare IsotopE Laboratory) at TRIUMF, a high power electron beam is used to produce radioactive ion beams via photo-fission. The electron beam is accelerated in a superconducting linac up to 50 MeV. The electron source provides electron bunches with charge up to 16 pC at a repetition frequency of 650 MHz leading to an average current of 10 mA . The kinetic energy of the electrons has been chosen to be 300 keV to allow direct injection into an accelerator cavity. The main components of the source are a gridded dispenser cathode (CPI 'Y845) in an SF6 filled vessel and an in-air HV power supply. The beam is bunched by applying DC and RF fields to the grid. Unique features of the gun are its cathode/anode geometry to reduce field emission, and transmission of RF modulation via a dielectric (ceramic) waveguide through the SF6. The latter obviates the need for an HV platform inside the vessel to carry the RF generator and results in a significantly smaller/simpler vessel. The source has been installed and first tests with accelerated beams have been performed. Measurements of the beam properties and results from the commissioning of the source will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC020
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TUPLR005	Development of 6 MeV European S-band Side-Coupled Industrial Electron Linear Accelerator at RTX & KAERI	electron, linac, coupling, gun	478
	P. Buaphad, S.C. Cha KAERI, Jeongeup-si, Republic of Korea P. Buaphad University of Science and Technology of Korea (UST), Daejeon, Republic of Korea P. Buaphad RTX, Daejeon, Republic of Korea Y. Kim ISU, Pocatello, Idaho, USA
	There are growing demands on low energy electron linear accelerator (linac) for industrial applications. Most of industrial electron linacs require a compact structure and limited undesirable neutron production to avoid huge lead shielding. Radiation Technology eXcellence (RTX) and Korea Atomic Energy Research Institute (KAERI) have developed a 6 MeV compact side-coupled linac by using 2998 MHz European S-band RF technology to meet those requirements. To design the linac structure, the 3D CST MICROWAVE STUDIO (CST-MWS) was used for various electromagnetic simulations, and ASTRA code was used for particle beam dynamics simulations. After various optimizations, the shunt impedance of 61 MΩ/m is obtained at 2998.38 MHz. With a peak RF power of 2.2 MW and a 47 cm-long structure, electron beam with a peak current of 150 mA can be accelerated from 25 keV to 6 MeV. For the industrial linac, the electron beam spotsize at an X-ray target, located 5 cm downstream of the linac structure exit should be smaller than 2 mm (FW). In addition, it can supply an X-ray dose rate of 8 Gy/min at 1 m after the X-ray target. In this paper, we describe the design concepts and optimization of the 2998 MHz side-coupled industrial linac structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR005
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TUPLR020	Commissioning of the Compact 14MeV LINAC for an FEL-Based THz Source	linac, quadrupole, gun, radiation	509
	Y.J. Pei, G. Feng, X.Y. He, Y. Hong, G. Huang, D. Jia, K. Jin, J. Liu, P. Lu, L. Shang, B.G. Sun, Zh. X. Tang, W. Wei, Z. Zhao USTC/NSRL, Hefei, Anhui, People's Republic of China L. Cao, Q.S. Chen, S. Hu, T. Hu, J. Li, Y.J. Liang, B. Qin, B. Tang, T. Tang, Y.Q. Xiong, Q. Zhang HUST, Wuhan, People's Republic of China W. Chen, Y.B. Wang, J. Zha Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China G. Feng DESY, Hamburg, Germany Zh. X. Tang DICP, Dalian, People's Republic of China
	Commissioning the compact LINAC of 14Mev for a THz source based on FEL Y.J.Pei National Synchrotron Radiation laboratory, University of Science & Technology of China Abstract The compact LINAC of 14MeV is designed for a FEL which will produce a THz radiation through 30μm to 300μm. The LINAC was composed of a novel EC-ITC-RF gun, constant gradient travelling wave accelerator with a collinear absorbing load, focusing system, RF power system, beam diagnostic system, vacuum system, control system and so on. The LINAC was installed on November of 2014. Last year, we finished the install of the undulator and the optical resonance cavities. Now the LINAC has been testing and commissioning for THz radiation test. So far, the running beam parameters of the LINAC are as the following: Energy is of 13.58MeV macro pulse current is of 655mA macro pulse length of 1.2μsμpulse beam current is of 59A beam length of theμpulse is of 4ps energy spread of 0.33% normal beam emmitance is of 24.1mm.mrad.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR020
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TUP106007	Results of Intensity Upgrade Phase I for 200 MeV H⁻ Linac at Brookhaven	linac, ion, operation, ion-source	634
	D. Raparia, B. Briscoe, C. Cullen, T. Lehn, V. LoDestro, A. McNerney, J. Ritter, A. Zelenski BNL, Upton, Long Island, New York, USA
	The 200 MeV H⁻ Linac has been operational for the last 45 years providing beam for the physics and isotope programs. Yearly integrated intensity delivered to BLIP has bean increased by six fold in past decade. Recently we have finish intensity, which resulted 40% more intensity for Brookhaven Linac Isotope Program (BLIP) and reduced losses along the linac and transfer line to BLIP by several folds. We will present detail of the upgrade and the future upgrades plane to further increase the intensity by factor of two
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106007
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TH1A02	Operation of KOMAC 100 MeV Linac	linac, operation, ion, DTL	683
	H.S. Kim KAERI, Daejon, Republic of Korea Y.-S. Cho, H.-J. Kwon Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government. A 100-MeV proton linear accelerator at the KOMAC (Korea Multi-purpose Accelerator Complex) was under development for past 15 years, including preliminary design study period, and was successfully commissioned in 2013. The operation of the linac for user service started in July 2013 with two beam lines: one for a 20-MeV beam and the other for a 100-MeV beam. The linac is composed of a 50-keV microwave proton source, a 3-MeV four-vane-type RFQ (radio-frequency quadrupole) and a 100-MeV DTL (drift tube linac). In 2015, the linac operating time was more than 2,800 hours with an availability of better than 89% and unscheduled downtime was about 73 hours, mainly due to the ion source and HVCM problems. More than 2,100 samples from various fields such as material science, bio and nano technology and nuclear science, were treated in 2015. Currently, additional beamline for radioisotope production is being commissioned and a new beamline for low-flux irradiation experiments are under construction along with a continuous effort being made to increase the average beam power.
	Slides TH1A02 [18.355 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A02
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THOP08	Beam Commissioning of the i-BNCT Linac	linac, rfq, ion, ion-source	760
	F. Naito, S. Anami, Z. Fang, K. Futatsukawa, Y. Honda, Y. Hori, M. Kawamura, H. Kobayashi, T. Kurihara, T. Miura, T. Miura, T. Miyajima, T. Obina, F. Qiu, Y. Sato, T. Shibata, M. Shimamoto, A. Takagi, E. Takasaki, M. Uota KEK, Ibaraki, Japan S. Fujikura ICEPP, Tokyo, Japan K. Ikegami J-PARC, KEK & JAEA, Ibaraki-ken, Japan H. Kumada, Su. Tanaka Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan Y. Liu, T. Maruta KEK/JAEA, Ibaraki-Ken, Japan A. Miura JAEA/J-PARC, Tokai-mura, Japan N. Nagura, T. Ohba Nippon Advanced Technology Co., Ltd., Tokai, Japan T. Onishi Tsukuba University, Ibaraki, Japan T. Ouchi ATOX, Ibaraki, Japan
	The beam commissioning of the linac for the boron neutron capture therapy of Ibaraki prefecture (i-BNCT) has been started. The accelerator of i-BNCT consists of the 3-MeV RFQ and 8-MeV DTL. The design of RF structure of them is based on the J-PARC linac. After the first demonstration of neutron production on December 2015, significant modifications to the linac were given in order to increase the operation stability and the beam power. The progress of the beam commissioning of the i-BNCT will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP08
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THOP09	Tuning of the CERN 750 MHz RFQ for Medical Applications	rfq, linac, quadrupole, operation	763
	B. Koubek, Y. Cuvet, A. Grudiev, C. Rossi, M.A. Timmins CERN, Geneva, Switzerland
	CERN has built a compact 750 MHz RFQ as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. It is divided into four segments and equipped with 32 tuners in total. The RFQ length corresponds to 5λ which is considered to be close to the limit for simple field adjustment using tuners. Nevertheless the high frequency results in a sensitive structure and requires careful tuning by means of the alignment of the pumping ports and fixed tuners. This paper gives an overview of the tuning procedure and bead pull measurements of the RFQ.
	Slides THOP09 [16.367 MB]
	Poster THOP09 [23.832 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP09
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THPLR006	Design Study of a Test Cavity for Evaluating RF Critical Magnetic Field of Thin-Film Superconductor	cavity, electromagnetic-fields, cryogenics, resonance	852
	H. Oikawa Utsunomiya University, Utsunomiya, Japan H. Hayano, S. Kato, T. Kubo, T. Saeki KEK, Ibaraki, Japan T. Higashiguchi Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Japan M. Hino Kyoto University, Research Reactor Institute, Osaka, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan
	Superconducting cavities of higher gradient has been demanded in various fields of the accelerator science. Also, according to the Technical Design Report (TDR) of International Linear Collider (ILC), the higher gradient of 45 MV/m is required in the second stage of ILC. To realize such higher gradient, several methods are proposed. One of such methods is to coat multi-layer thin-film superconductor on the inner surface of RF cavity where the thin film increases the RF critical field on the inner surface of the cavity. To demonstrate the RF performance of thin-film structure on a small coupon sample, we designed the RF mushroom-shaped cavity with which the RF critical magnetic field is measured on a thin-film coupon sample set on the inner surface of the cavity. If the RF cavity is cooled down below the critical temperature of thin-film superconductor with supplying RF power, the heat dissipation might be measured on the coupon sample in the cavity. We designed the shape of the cavity so as to produce a strong RF magnetic field parallel to the sample surface efficiently. We report the design, manufacturing and RF property measurements of the cavity in this presentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR006
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THPLR009	A Compact Muon Accelerator for Tomography and Active Interrogation	linac, electron, cavity, simulation	861
	R.W. Garnett, S.S. Kurennoy, L. Rybarcyk LANL, Los Alamos, New Mexico, USA K. Hasegawa JAEA, Ibaraki-ken, Japan S. Portillo, E. Schamiloglu University of New Mexico, Albuquerque, USA N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Funding: This work is supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396. Muons have been demonstrated to be great probes for imaging large and dense objects due to their excellent penetrating ability. At present there are no muon accelerators. Development of a compact system that can produce an intense beam of accelerated muons would provide unique imaging options for stockpile stewardship while delivering minimal radiation dose, as well as various homeland-security and industrial applications. Our novel compact accelerator approach allows a single linac to be used to first accelerate an electron beam to 800 MeV to generate muons by interacting with a production target in a high-field solenoid magnet and then to collect and accelerate these low-energy muons to 1 GeV to be used for imaging or active interrogation. The key enabling technology is a high-gradient accelerator with large energy and angular acceptances. Our proposed solution for efficient acceleration of low-energy muons is a 0-mode linac coupled with conventional electron RF accelerating structures to provide a compact system that could deliver a controllable high-flux beam of muons with well-defined energy to allow precise radiographic inspections of complicated objects. The details of the conceptual design will be discussed.
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THPLR023	The ARIEL Radioactive Ion Beam Transport System	ISAC, vacuum, TRIUMF, ion	891
	M. Marchetto, T.J. Alderson, F. Ames, R.A. Baartman, J.D. Chak, P.E. Dirksen, T.G. Emmens, G.W. Hodgson, T. Hruskovec, M. Ilagan, R.E. Laxdal, N. Muller, D. Preddy, D. Rowbotham, S. Saminathan, Q. Temmel, V.A. Verzilov, D. Yosifov TRIUMF, Vancouver, Canada
	The Advanced Rare IsotopE Laboratory (ARIEL) is going to triple the radioactive ion beam (RIB) production at TRIUMF. The facility will enable multi-user capability in the Isotope Separation and ACceleration (ISAC) facility by delivering three RIBs simultaneously. Two new independent target stations will generate RIBs using a proton driver beam up to 50 kW from the 500 MeV cyclotron and an electron driver beam for photo-fission from the new superconducting e-linac in addition to the existing ISAC RIB production. The multi-user capability is enabled by a complex radioactive ion beam transport switchyard consisting entirely of electrostatic optics. This system includes two separation stages at medium and high resolution with the latter achieved by a mass separator designed for an operational resolving power of 20000 for a 3 micrometer transmitted emittance. Part of the system also includes an Electron Beam Ion Source (EBIS) charge breeder fed by a radio frequency cooler that allows the post-acceleration of heavy masses. Beam selection downstream of the EBIS is achieved by means of a Nier type separator. The facility is in a detailed design stage and some tests, procurements and partial installation are foreseen by the end of 2016.
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THPLR049	Tuning the IFMIF 5MeV RFQ Accelerator	rfq, dipole, insertion, vacuum	969
	A. Palmieri, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy
	In order to allow proper operation of the IFMIF RFQ, it is necessary to perform a campaign of RF measurements on the cavity aimed, on one hand, at determining the basic RF parameters (frequency, Q0, etc.), on the other hand at verifying the fulfilment of the voltage law within the specified admitted range (±2% target value, ±4% acceptance value) of any of the perturbative components upon successive tuner settings as predicted by the tuner algorithm. These measurements also involve the determination of the proper depth of the end plates and the positioning and length of the Dipole Stabilizers (if any). In this contribution the tuning procedure and the results of such measurements will be presented for the case of the IFMIF RFQ will be described.
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Paper

Title

Other Keywords

Page

MOPRC007

Status of and Plans for the Beam Dynamics Program DYNAC

rfq, space-charge, beam-transport, proton

80

E. Tanke, M. Eshraqi, Y.I. Levinsen, A. Ponton
ESS, Lund, Sweden
S. Valero
CEA, Gif-sur-Yvette, France

A short introduction to the linac beam dynamics code DYNAC will be given. Recently implemented features, such as a Graphical User Interface (GUI), will be presented and benchmarking of the Radio Frequency Quadrupole (RFQ) model will be discussed. Additional planned features to DYNAC and the GUI will be touched upon.

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MOPRC008

Dispersion Free and Dispersion Target Steering Experience at CTF3

linac, optics, quadrupole, dipole

83

D. Gamba, R. Corsini, T. Persson, P.K. Skowroński, F. Tecker
CERN, Geneva, Switzerland
P. Burrows
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
P. Burrows
JAI, Oxford, United Kingdom

One of the goals of the CLIC Test Facility (CTF3) at CERN is to demonstrate the feasibility of the CLIC Drive Beam recombination, which takes place in the Drive Beam Recombination Complex (DBRC). The tight geometry of the DBRC together with its strong optics and the high energy-spread of the beam require a careful control of the beam size along the different sections of the DBRC. One of the main contribution to beam size is the dispersion. If uncontrolled, dispersion leads to fast increase of the beam size, hence it may affect the beam current stability of the combined beam. A tool has been implemented at CTF3 to measure and correct dispersion during and after the setup of the machine. Dispersion Free Steering (DFS) has been applied in the upstream drive beam LINAC, while Dispersion Target Steering (DTS) has been used in the rings of the DBRC. In the LINAC the weak optics and the wide dynamic aperture of the beamline allow a straightforward correction. In the DBRC the aperture is tighter, and the strong optics produce non-linear dispersion which one needs to take into account. A general overview of current status and future plans in controlling dispersion at CTF3 will be presented.

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MOPRC017

CIADS HEBT Lattice Design

vacuum, collimation, lattice, emittance

108

Y.S. Qin
IMP/CAS, Lanzhou, People's Republic of China

Funding: I want to apply for financial support.
CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target.

Poster MOPRC017 [1.273 MB]

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MOPLR039

Development of New Type "Ninja" Cathode for Nb 9-cell Cavity and Experiment of Vertical Electro-Polishing

cavity, cathode, experiment, collider

223

K.N. Nii, V. Chouhan, Y.I. Ida, T.Y. Yamaguchi
MGH, Hyogo-ken, Japan
H. Hayano, S. Kato, H. Monjushiro, T. Saeki, M. Sawabe
KEK, Ibaraki, Japan
K. Ishimi
MGI, Chiba, Japan

Marui Galvanizing Co. Ltd. has been improving Vertical Electro-Polishing (VEP) technologies and facilities for Nb 9-cell superconducting accelerator cavity for International Linear Collider (ILC) in collaboration with KEK. This time, we developed new type 'Ninja' cathode in order to improve VEP uniformity of Nb 9-cell cavity inner surface based on the results of 1-cell cavity VEP experiment. In this article, we will report construction of new type "Ninja" cathode for Nb 9-cell cavity and experiment of VEP using this.

Poster MOPLR039 [0.610 MB]

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MOPLR047

Advanced Vertical Electro-Polishing studies at Cornell with Faraday

cavity, SRF, niobium, status

233

F. Furuta, M. Ge, T. Gruber, G.H. Hoffstaetter, J.J. Kaufman, M. Liepe, J. Sears
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
T.D. Hall, M.E. Inman, S.T. Snyder, E.J. Taylor
Faraday Technology, Inc., Clayton, Ohio, USA

Cornell's SRF group and Faraday Technology Inc. have started collaborations on two phase-II SBIR projects. Both projects are aiming for the development of advanced Vertical Electro-Polishing (VEP) for Nb SRF cavities, such as HF free or acid free VEP protocols. These could be eco-friendlier alternatives for the standard, HF-based EP electrolyte used, and could bring new breakthrough performance for Nb SRF cavities. Here we give a status update and report first results from these two projects.

Poster MOPLR047 [2.852 MB]

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MOPLR051

Simulation of Gas and Plasma Charge Strippers

plasma, electron, ion, heavy-ion

248

O.S.H. Haas, O. Boine-Frankenheim
TEMF, TU Darmstadt, Darmstadt, Germany

Funding: This work is supported by the BMBF as part of project 05P15RDRBA.
Charge stripping of intense heavy ion beams is a major challenge in current and future linear heavy ion accelerators. Conventional stripping techniques are limited in their applicability, e.g. solid carbon foils suffer from short lifetimes at high intensities. One possible alternative is the use of a plasma as a stripping medium, which the presented work focuses on. The main goal of the studies is the prediction of the final charge state distribution of the ion beam. Rate equations were implemented numerically, taking into account different models for ionization, recombination and energy loss processes. First quantitative results are presented in form of an overview of the charge state distributions of different charge stripping media. For fixed projectile properties and target phase, it is observed that the mean charge state q₀ decreases for increasing nuclear charge Z_\text{T} of the target. Plasmas show significantly increased q₀ for the same Z_T. The width d of the charge state distributions is larger for higher Z_\text{T}. The latter is caused by multiple loss of the projectile and decreases the maximum stripping efficiency by typically less than a factor of 2.

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MOPLR061

Commissioning of the RI Production Beam Line of KOMAC

beam-transport, proton, isotope-production, linac

271

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

Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
A radioisotope (RI) production beam line has been developed at Korea Multi-purpose Accelerator Complex (KOMAC) in 2015 and the commissioning started in 2016. The beam parameters of the beam line are 100-MeV beam energy with a maximum 30 kW beam power, which is driven by KOMAC 100-MeV proton linac. The main components of the beam line are a beam transport system, a target transport system, a cooling system for target and hot cell. KOMAC has a plan to commission the beam line and get an operational license in 2016 and start user service in 2017. In this paper, the development and initial commissioning results of the RI production beam line are presented.

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MOPLR072

The Effect of DTL Cavity Field Errors on Beam Spill at LANSCE

DTL, cavity, linac, LLRF

301

L. Rybarcyk, R.C. McCrady
LANL, Los Alamos, New Mexico, USA

The Los Alamos Neutron Science Center (LANSCE) accelerator comprises two (H⁺ and H⁻) 750-keV Cockcroft-Walton style injectors, a 201.25-MHz, 100-MeV drift-tube linac (DTL) and an 805-MHz, 800-MeV coupled-cavity linac (CCL). As part of the LANSCE Risk Mitigation project a new digital low-level radio frequency (LLRF) control system is being deployed across the linac, starting with the DTL. Related to this upgrade, a study was performed where specific cavity field errors were simultaneously introduced in all DTL tanks about the nominal stable, low-spill, production set points to mimic LLRF control errors. The impact of these errors on the resultant beam spill was quantified for the nominal 100 μA, 800-MeV Lujan beam. We present the details of the measurement approach and results that show a rapid increase in total linac beam spill as DTL cavity field phase and amplitude errors are increased.

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MOP106012

MESA - an ERL Project for Particle Physics Experiments

experiment, electron, operation, linac

313

F. Hug, K. Aulenbacher, R.G. Heine, B. Ledroit, D. Simon
IKP, Mainz, Germany

The Mainz Energy-recovering Superconducting Accelerator (MESA) will be constructed at the Institut für Kernphysik of the Johannes Gutenberg University of Mainz. The accelerator is a low energy continuous wave (CW) recirculating electron linac for particle physics experiments. MESA will be operated in two different modes serving mainly two experiments: the first is the external beam (EB) mode, where the beam is dumped after being used with the external fixed target experiment P2, whose goal is the measurement of the weak mixing angle with highest accuracy. The required beam current for P2 is 150 μA with polarized electrons at 155 MeV. In the second operation mode MESA will be run as an energy recovery linac (ERL). The experiment served in this mode is a (pseudo) internal fixed target experiment named MAGIX. It demands an unpolarized beam of 1 mA at 10⁵ MeV. In a later construction stage of MESA the achievable beam current in ERL-mode shall be upgraded to 10 mA. Within this contribution an overview of the MESA project will be given highlighting the latest accelerator layout and the challenges of operation with high density internal gas targets.
Work supported by DFG through cluster of excellence PRISMA, CRC 1044 and RTG 2128

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TUOP03

Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell

ion, emittance, heavy-ion, linac

387

P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev
HIM, Mainz, Germany
W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev
GSI, Darmstadt, Germany
Ch.E. Düllmann, P. Scharrer
Mainz University, Mainz, Germany

The GSI UNILAC in combination with SIS18 will serve as a high-current, heavy-ion injector for the FAIR facility. It must meet high demands in terms of beam brilliance at a low duty factor. As part of an UNILAC upgrade program dedicated to FAIR, a new pulsed gas stripper cell was developed, aiming for increased beam intensities inside the post-stripper. The pulsed gas injection is synchronized with the beam pulse timing, enabling a highly-demanded, increased gas density. First tests using uranium beams on a hydrogen target showed a 60%-increased stripping efficiency into the desired 28+ charge state. In 2015, the setup was improved to be able to deliver increased target thicknesses and enhanced flexibility of the gas injection. In recent beam times, the pulsed gas cell was used with various ion-beam types, to test the capabilities for operation at the GSI UNILAC. The stripping of two ion beams in different gases at different gas densities was successfully tested in mixed-beam operation. Charge fractions, beam emittance, and energy-loss were systematically measured using uranium, bismuth, titanium, and argon beams on hydrogen, helium, and nitrogen targets. Selected results will be presented at the conference.

Slides TUOP03 [1.131 MB]

Poster TUOP03 [5.943 MB]

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TUPRC006

Phase-Space Transformation for a Uniform Target Irradiation at DONES

octupole, space-charge, neutron, simulation

424

C. Oliver, A. Ibarra
CIEMAT, Madrid, Spain
P. Cara
Fusion for Energy, Garching, Germany
N. Chauvin
CEA/DSM/IRFU, France
A. Gallego
Universidad Complutense Madrid, Madrid, Spain

Funding: "This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053."
In the framework of the EU Roadmap, a DEMO Oriented Neutron Source (DONES) [*] has been proposed to provide a high neutron intense neutron source with a suitable neutron spectrum to understand the degradation of advanced materials under DEMO and future fusion plants irradiation conditions. DONES will be based on the International Fusion Materials Irradiation Facility IFMIF [**], being only one accelerator considered. The HEBT will be devoted to the transport, bending and shaping of the 40 MeV, 125 mA CW deuteron beam to the free surface of the rapidly flowing lithium target. To produce a forward peaked source of fusion-like neutrons, which stream through the target into the test cell, a rectangular uniform distribution across the flat top of the beam profile is required, being the footprint tailored in both the vertical and horizontal directions according to the target design. Different methods for beam uniformization in IFMIF accelerator has been proposed in the past [***]. Two main concerns in DONES will be the minimization of particle losses over the whole HEBT and the effect of the different shaping techniques on such strong space charge regime, specially on the beam halo modulation. A review of the different methods for the beam shaping of the high power, high space charge DONES HEBT beam will be depicted. A final solution will be proposed.
[*] DONES Conceptual Design Report, April 2014
[**] IFMIF Comprehensive Design Report, CDR, IFMIF International Team, January 2004
[***] IFMIF Intermediate Engineering Design Report

Poster TUPRC006 [2.546 MB]

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TUPRC015

Final Acceptance Test of SRF Photo-Injector Cold String for the BERLinPro Energy Recovery Linac

cavity, cathode, SRF, gun

445

A. Neumann, D. Böhlick, P. Echevarria, A. Frahm, F. Göbel, T. Kamps, J. Knobloch, O. Kugeler, M. Schuster, J. Ullrich, A. Ushakov
HZB, Berlin, Germany
A. Burrill
SLAC, Menlo Park, California, USA
G. Ciovati, P. Kneisel
JLab, Newport News, Virginia, USA
A. Matheisen, M. Schalwat, M. Schmökel
DESY, Hamburg, Germany
E.N. Zaplatin
FZJ, Jülich, Germany

Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association.
Helmholtz-Zentrum Berlin (HZB) is currently designing and building an high average current all superconducting CW driven ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100mA and short pulses of about 2 ps. In order to achieve these demanding goals HZB started a staged program for developing this class of required high current, high brightness SRF electron sources. In this contribution we will present the current status of the module assembly and testing of the prototype SRF photo-injector cavity cold string. The steps taken to install the cathode insert system with the cavity in the cleanroom and the following horizontal test of the cold string as final acceptance test prior installation into its cryostat are shown. First beam in a dedicated diagnostics teststand called Gunlab are planned for this winter.

Poster TUPRC015 [2.077 MB]

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TUPRC020

The TRIUMF ARIEL RF Modulated Thermionic Electron Source

electron, cathode, emittance, TRIUMF

458

F. Ames, Y.-C. Chao, K. Fong, N. Khan, S.R. Koscielniak, A. Laxdal, L. Merminga, T. Planche, S. Saminathan, D.W. Storey
TRIUMF, Vancouver, Canada
Y.-C. Chao, L. Merminga
SLAC, Menlo Park, California, USA
C.K. Sinclair
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: ARIEL is funded by the Canada Foundation for Innovation, the Provinces AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives funding via a contribution agreement with the National Research Council of Canada
Within the ARIEL (Advanced Rare IsotopE Laboratory) at TRIUMF, a high power electron beam is used to produce radioactive ion beams via photo-fission. The electron beam is accelerated in a superconducting linac up to 50 MeV. The electron source provides electron bunches with charge up to 16 pC at a repetition frequency of 650 MHz leading to an average current of 10 mA . The kinetic energy of the electrons has been chosen to be 300 keV to allow direct injection into an accelerator cavity. The main components of the source are a gridded dispenser cathode (CPI 'Y845) in an SF6 filled vessel and an in-air HV power supply. The beam is bunched by applying DC and RF fields to the grid. Unique features of the gun are its cathode/anode geometry to reduce field emission, and transmission of RF modulation via a dielectric (ceramic) waveguide through the SF6. The latter obviates the need for an HV platform inside the vessel to carry the RF generator and results in a significantly smaller/simpler vessel. The source has been installed and first tests with accelerated beams have been performed. Measurements of the beam properties and results from the commissioning of the source will be presented.

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TUPLR005

Development of 6 MeV European S-band Side-Coupled Industrial Electron Linear Accelerator at RTX & KAERI

electron, linac, coupling, gun

478

P. Buaphad, S.C. Cha
KAERI, Jeongeup-si, Republic of Korea
P. Buaphad
University of Science and Technology of Korea (UST), Daejeon, Republic of Korea
P. Buaphad
RTX, Daejeon, Republic of Korea
Y. Kim
ISU, Pocatello, Idaho, USA

There are growing demands on low energy electron linear accelerator (linac) for industrial applications. Most of industrial electron linacs require a compact structure and limited undesirable neutron production to avoid huge lead shielding. Radiation Technology eXcellence (RTX) and Korea Atomic Energy Research Institute (KAERI) have developed a 6 MeV compact side-coupled linac by using 2998 MHz European S-band RF technology to meet those requirements. To design the linac structure, the 3D CST MICROWAVE STUDIO (CST-MWS) was used for various electromagnetic simulations, and ASTRA code was used for particle beam dynamics simulations. After various optimizations, the shunt impedance of 61 MΩ/m is obtained at 2998.38 MHz. With a peak RF power of 2.2 MW and a 47 cm-long structure, electron beam with a peak current of 150 mA can be accelerated from 25 keV to 6 MeV. For the industrial linac, the electron beam spotsize at an X-ray target, located 5 cm downstream of the linac structure exit should be smaller than 2 mm (FW). In addition, it can supply an X-ray dose rate of 8 Gy/min at 1 m after the X-ray target. In this paper, we describe the design concepts and optimization of the 2998 MHz side-coupled industrial linac structure.

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TUPLR020

Commissioning of the Compact 14MeV LINAC for an FEL-Based THz Source

linac, quadrupole, gun, radiation

509

Y.J. Pei, G. Feng, X.Y. He, Y. Hong, G. Huang, D. Jia, K. Jin, J. Liu, P. Lu, L. Shang, B.G. Sun, Zh. X. Tang, W. Wei, Z. Zhao
USTC/NSRL, Hefei, Anhui, People's Republic of China
L. Cao, Q.S. Chen, S. Hu, T. Hu, J. Li, Y.J. Liang, B. Qin, B. Tang, T. Tang, Y.Q. Xiong, Q. Zhang
HUST, Wuhan, People's Republic of China
W. Chen, Y.B. Wang, J. Zha
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
G. Feng
DESY, Hamburg, Germany
Zh. X. Tang
DICP, Dalian, People's Republic of China

Commissioning the compact LINAC of 14Mev for a THz source based on FEL Y.J.Pei National Synchrotron Radiation laboratory, University of Science & Technology of China Abstract The compact LINAC of 14MeV is designed for a FEL which will produce a THz radiation through 30μm to 300μm. The LINAC was composed of a novel EC-ITC-RF gun, constant gradient travelling wave accelerator with a collinear absorbing load, focusing system, RF power system, beam diagnostic system, vacuum system, control system and so on. The LINAC was installed on November of 2014. Last year, we finished the install of the undulator and the optical resonance cavities. Now the LINAC has been testing and commissioning for THz radiation test. So far, the running beam parameters of the LINAC are as the following: Energy is of 13.58MeV macro pulse current is of 655mA macro pulse length of 1.2μsμpulse beam current is of 59A beam length of theμpulse is of 4ps energy spread of 0.33% normal beam emmitance is of 24.1mm.mrad.

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TUP106007

Results of Intensity Upgrade Phase I for 200 MeV H⁻ Linac at Brookhaven

linac, ion, operation, ion-source

634

D. Raparia, B. Briscoe, C. Cullen, T. Lehn, V. LoDestro, A. McNerney, J. Ritter, A. Zelenski
BNL, Upton, Long Island, New York, USA

The 200 MeV H⁻ Linac has been operational for the last 45 years providing beam for the physics and isotope programs. Yearly integrated intensity delivered to BLIP has bean increased by six fold in past decade. Recently we have finish intensity, which resulted 40% more intensity for Brookhaven Linac Isotope Program (BLIP) and reduced losses along the linac and transfer line to BLIP by several folds. We will present detail of the upgrade and the future upgrades plane to further increase the intensity by factor of two

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106007

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TH1A02

Operation of KOMAC 100 MeV Linac

linac, operation, ion, DTL

683

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

Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
A 100-MeV proton linear accelerator at the KOMAC (Korea Multi-purpose Accelerator Complex) was under development for past 15 years, including preliminary design study period, and was successfully commissioned in 2013. The operation of the linac for user service started in July 2013 with two beam lines: one for a 20-MeV beam and the other for a 100-MeV beam. The linac is composed of a 50-keV microwave proton source, a 3-MeV four-vane-type RFQ (radio-frequency quadrupole) and a 100-MeV DTL (drift tube linac). In 2015, the linac operating time was more than 2,800 hours with an availability of better than 89% and unscheduled downtime was about 73 hours, mainly due to the ion source and HVCM problems. More than 2,100 samples from various fields such as material science, bio and nano technology and nuclear science, were treated in 2015. Currently, additional beamline for radioisotope production is being commissioned and a new beamline for low-flux irradiation experiments are under construction along with a continuous effort being made to increase the average beam power.

Slides TH1A02 [18.355 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A02

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THOP08

Beam Commissioning of the i-BNCT Linac

linac, rfq, ion, ion-source

760

F. Naito, S. Anami, Z. Fang, K. Futatsukawa, Y. Honda, Y. Hori, M. Kawamura, H. Kobayashi, T. Kurihara, T. Miura, T. Miura, T. Miyajima, T. Obina, F. Qiu, Y. Sato, T. Shibata, M. Shimamoto, A. Takagi, E. Takasaki, M. Uota
KEK, Ibaraki, Japan
S. Fujikura
ICEPP, Tokyo, Japan
K. Ikegami
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
H. Kumada, Su. Tanaka
Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan
Y. Liu, T. Maruta
KEK/JAEA, Ibaraki-Ken, Japan
A. Miura
JAEA/J-PARC, Tokai-mura, Japan
N. Nagura, T. Ohba
Nippon Advanced Technology Co., Ltd., Tokai, Japan
T. Onishi
Tsukuba University, Ibaraki, Japan
T. Ouchi
ATOX, Ibaraki, Japan

The beam commissioning of the linac for the boron neutron capture therapy of Ibaraki prefecture (i-BNCT) has been started. The accelerator of i-BNCT consists of the 3-MeV RFQ and 8-MeV DTL. The design of RF structure of them is based on the J-PARC linac. After the first demonstration of neutron production on December 2015, significant modifications to the linac were given in order to increase the operation stability and the beam power. The progress of the beam commissioning of the i-BNCT will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP08

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THOP09

Tuning of the CERN 750 MHz RFQ for Medical Applications

rfq, linac, quadrupole, operation

763

B. Koubek, Y. Cuvet, A. Grudiev, C. Rossi, M.A. Timmins
CERN, Geneva, Switzerland

CERN has built a compact 750 MHz RFQ as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. It is divided into four segments and equipped with 32 tuners in total. The RFQ length corresponds to 5λ which is considered to be close to the limit for simple field adjustment using tuners. Nevertheless the high frequency results in a sensitive structure and requires careful tuning by means of the alignment of the pumping ports and fixed tuners. This paper gives an overview of the tuning procedure and bead pull measurements of the RFQ.

Slides THOP09 [16.367 MB]

Poster THOP09 [23.832 MB]

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THPLR006

Design Study of a Test Cavity for Evaluating RF Critical Magnetic Field of Thin-Film Superconductor

cavity, electromagnetic-fields, cryogenics, resonance

852

H. Oikawa
Utsunomiya University, Utsunomiya, Japan
H. Hayano, S. Kato, T. Kubo, T. Saeki
KEK, Ibaraki, Japan
T. Higashiguchi
Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Japan
M. Hino
Kyoto University, Research Reactor Institute, Osaka, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan

Superconducting cavities of higher gradient has been demanded in various fields of the accelerator science. Also, according to the Technical Design Report (TDR) of International Linear Collider (ILC), the higher gradient of 45 MV/m is required in the second stage of ILC. To realize such higher gradient, several methods are proposed. One of such methods is to coat multi-layer thin-film superconductor on the inner surface of RF cavity where the thin film increases the RF critical field on the inner surface of the cavity. To demonstrate the RF performance of thin-film structure on a small coupon sample, we designed the RF mushroom-shaped cavity with which the RF critical magnetic field is measured on a thin-film coupon sample set on the inner surface of the cavity. If the RF cavity is cooled down below the critical temperature of thin-film superconductor with supplying RF power, the heat dissipation might be measured on the coupon sample in the cavity. We designed the shape of the cavity so as to produce a strong RF magnetic field parallel to the sample surface efficiently. We report the design, manufacturing and RF property measurements of the cavity in this presentation.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR006

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THPLR009

A Compact Muon Accelerator for Tomography and Active Interrogation

linac, electron, cavity, simulation

861

R.W. Garnett, S.S. Kurennoy, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA
K. Hasegawa
JAEA, Ibaraki-ken, Japan
S. Portillo, E. Schamiloglu
University of New Mexico, Albuquerque, USA
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Funding: This work is supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396.
Muons have been demonstrated to be great probes for imaging large and dense objects due to their excellent penetrating ability. At present there are no muon accelerators. Development of a compact system that can produce an intense beam of accelerated muons would provide unique imaging options for stockpile stewardship while delivering minimal radiation dose, as well as various homeland-security and industrial applications. Our novel compact accelerator approach allows a single linac to be used to first accelerate an electron beam to 800 MeV to generate muons by interacting with a production target in a high-field solenoid magnet and then to collect and accelerate these low-energy muons to 1 GeV to be used for imaging or active interrogation. The key enabling technology is a high-gradient accelerator with large energy and angular acceptances. Our proposed solution for efficient acceleration of low-energy muons is a 0-mode linac coupled with conventional electron RF accelerating structures to provide a compact system that could deliver a controllable high-flux beam of muons with well-defined energy to allow precise radiographic inspections of complicated objects. The details of the conceptual design will be discussed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR009

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THPLR023

The ARIEL Radioactive Ion Beam Transport System

ISAC, vacuum, TRIUMF, ion

891

M. Marchetto, T.J. Alderson, F. Ames, R.A. Baartman, J.D. Chak, P.E. Dirksen, T.G. Emmens, G.W. Hodgson, T. Hruskovec, M. Ilagan, R.E. Laxdal, N. Muller, D. Preddy, D. Rowbotham, S. Saminathan, Q. Temmel, V.A. Verzilov, D. Yosifov
TRIUMF, Vancouver, Canada

The Advanced Rare IsotopE Laboratory (ARIEL) is going to triple the radioactive ion beam (RIB) production at TRIUMF. The facility will enable multi-user capability in the Isotope Separation and ACceleration (ISAC) facility by delivering three RIBs simultaneously. Two new independent target stations will generate RIBs using a proton driver beam up to 50 kW from the 500 MeV cyclotron and an electron driver beam for photo-fission from the new superconducting e-linac in addition to the existing ISAC RIB production. The multi-user capability is enabled by a complex radioactive ion beam transport switchyard consisting entirely of electrostatic optics. This system includes two separation stages at medium and high resolution with the latter achieved by a mass separator designed for an operational resolving power of 20000 for a 3 micrometer transmitted emittance. Part of the system also includes an Electron Beam Ion Source (EBIS) charge breeder fed by a radio frequency cooler that allows the post-acceleration of heavy masses. Beam selection downstream of the EBIS is achieved by means of a Nier type separator. The facility is in a detailed design stage and some tests, procurements and partial installation are foreseen by the end of 2016.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR023

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THPLR049

Tuning the IFMIF 5MeV RFQ Accelerator

rfq, dipole, insertion, vacuum

969

A. Palmieri, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy

In order to allow proper operation of the IFMIF RFQ, it is necessary to perform a campaign of RF measurements on the cavity aimed, on one hand, at determining the basic RF parameters (frequency, Q0, etc.), on the other hand at verifying the fulfilment of the voltage law within the specified admitted range (±2% target value, ±4% acceptance value) of any of the perturbative components upon successive tuner settings as predicted by the tuner algorithm. These measurements also involve the determination of the proper depth of the end plates and the positioning and length of the Dipole Stabilizers (if any). In this contribution the tuning procedure and the results of such measurements will be presented for the case of the IFMIF RFQ will be described.

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