04 Hadron Accelerators
A08 Linear Accelerators

Paper	Title	Page
MOYBA02	New Design Approaches for High Intensity Superconducting Linacs – The New ESS Linac Design	23
	D.P. McGinnis ESS, Lund, Sweden
	The cost of the next generation of high intensity accelerators has become so large that no single institution can solely afford to fund the construction of the project. To fund these large projects, institutions have embarked on forming ambitious collaboration structures with other laboratories. To induce other laboratories to join the collaboration, compromises must be made in the accelerator technical design to offer interesting and challenging projects to partner institutions. The cost of high intensity hadron accelerators is largely driven by RF system. A new design philosophy different from the traditional approach is emerging for the high intensity frontier machines. Emittance preservation is often less of an issue as long as beam losses are kept low. At ESS modifications were introduced to the linac design. One of the major changes is the reduction of final energy and an increase of gradient and beam current. As a result the design now meets the cost objective but for the price of a higher risk. The accelerator system designer must then try to balance the cost and technical risks while also satisfying the interests and external goals of the partner laboratories.
	Slides MOYBA02 [2.277 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOYBA02
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WEYA01	Challenges of Radioactive Beam Facilities – Comparing Solutions at SPIRAL2 and FAIR	1852
	R. Ferdinand GANIL, Caen, France
	The SPIRAL2 facility at GANIL will use a high-power p, d and heavy-ion driver to produce RIB though both ISOL and in-flight techniques. The SPIRAL2-injector beam is expected before the end of 2014. The construction of the FAIR facility has started at GSI and the outline of the accelerator complex is well defined. A clear strategy and construction schedule is defined in the framework of the international FAIR collaboration. This talk will give an overview of the accelerators at both facilities and compare the characteristics and benefits of these two approaches to meet their user needs.
	Slides WEYA01 [9.134 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEYA01
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WEOBA02	Superconducting Linac for Rare Isotope Science Project	1861
	H.J. Kim, H.J. Cha, M.O. Hyun, H. Jang, H.C. Jung, Y. Kim, M. Lee, G.-T. Park IBS, Daejeon, Republic of Korea
	Rare Isotope Science Project (RISP) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. The RISP driver linac which is used to accelerate the beam, for an example, Uranium ions from 0.5 MeV/u to 200 MeV/u consists of superconducting RF cavities and warm quadrupole magnets for focusing heavy ion beams. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the status of RISP linac design and the development of superconducting cavity and cryomodule.
	Slides WEOBA02 [9.226 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOBA02
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THPRO095	The Design, Construction and Experiments of a RFQ Cold Model at Tsinghua University	3110
SUSPSNE037	use link to see paper's listing under its alternate paper code
	L. Du, Q.Z. Xing, Y. Yang TUB, Beijing, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China (Major Research Plan Grant No. 91126003 and Project 11175096). The design, construction and experiments of a cold model of one high-current CW RFQ with ramped inter-vane voltage at Tsinghua University are presented in this paper. The 1-meter-long aluminium cold model is chosen to be the same as the low-energy part of the 3-meter-long RFQ. This cold model will be used mainly for the RFQ field study and education.
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THPRO098	Realistic Modeling of 4-Rod RFQs with CST Studio	3119
	S.S. Kurennoy, Y.K. Batygin, E.R. Olivas, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	RFQ accelerators are usually designed and modeled with standard codes based on electrostatic field approximations. There are recent examples when this approach fails to predict the RFQ performance accurately: for 4-rod RFQs 3D effects near the vane ends can noticeably influence the beam dynamics. The same applies to any RFQ where the quadrupole symmetry is broken, e.g., 4-vane RFQ with windows. We analyzed two 201.25-MHz 4-rod RFQs – one recently commissioned at FNAL and a new design for LANL – using 3D modeling with CST Studio. In both cases the manufacturer CAD RFQ model was imported into CST. The EM analysis with MicroWave Studio (MWS) was followed by beam dynamics modeling with Particle Studio (PS). For the LANL RFQ with duty factor up to 15%, a thermal-stress analysis with ANSYS was also performed. The simulation results for FNAL RFQ helped our Fermilab colleagues fix the low output beam energy. The LANL RFQ design was modified after CST simulations indicated insufficient tuning range and incorrect output energy; the modified version satisfies the design requirements. Our PS results were confirmed by multi-particle beam-dynamics codes that used the MWS-calculated RF fields.
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THPRO112	Beam Dynamics Analysis in the Beam Halo Experiments at IHEP	3159
	H. Jiang, S. Fu, C. Meng, J. Peng, Y. Zou IHEP, Beijing, People's Republic of China
	We have measured the beam parameters properly, and also found the RMS matched beam. Now we simulate the matched beam and the mismatched beam using the IMPACT and TraceWin code. We find the simulations can succeed to reproduce the beam profiles without halo for both matched and mismatched beam, but there are some differences for the beam with halo.
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THPME001	Commissioning and Operation of the MedAustron Injector: Results and Future Outlook	3202
	L.C. Penescu, M. Kronberger, T. Kulenkampff, F. Osmić, P. Urschütz EBG MedAustron, Wr. Neustadt, Austria W. Pirkl CERN, Geneva, Switzerland
	The MedAustron facility is a synchrotron-driven hadron therapy and research center presently under construction in Wiener Neustadt, Austria. In its final outline, the facility will provide H+ beams with kinetic energies ≤250MeV and C6+ beams of ≤400MeV/u for clinical applications, and for non-clinical applications H+ of up to 800MeV. First patient treatment is foreseen for the end of 2015. The (H3)+ and C4+ beams are generated at 8keV/u in continuous mode by three ECR ion sources and transported to the RFQ for acceleration to 400keV/u. An inter-tank section matches the beam to the entrance of an IH-mode DTL that accelerates the particles to 7MeV/u before they are stripped to, respectively, H+ and C6+, debunched and transported to the injection plane of the synchrotron. At a later stage of the project, beams of other species can be generated with similar optics. This contribution presents the results of the injector commissioning and operation. A comparison with the baseline optics and with the design error studies is given. In addition, an overview on the operational experience is given, with emphasis on the system reliability, stability and reproducibility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME001
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THPME002	Delta-Phi Method for the IFMIF-LIPAc SRF-Linac Cavity Tuning	3205
SUSPSNE041	use link to see paper's listing under its alternate paper code
	M. Valette, N. Chauvin CEA/IRFU, Gif-sur-Yvette, France P.A.P. Nghiem, D. Uriot CEA/DSM/IRFU, France
	In order to achieve the upcoming commissioning of the IFMIF-LIPAc prototype accelerator in Rokkasho, the precision and resolution required for all diagnostics must be determined. These specifications will depend on the precision at which the tuning parameters must be set and finally by the tuning errors that can be tolerated on the beam itself. We will here discuss the use of the ∆φ method to tune the SRF-Linac and the resolution requirements it implies for the BPMs. This method, using a relative time of flight measurement to assess the energy of the beam, has the advantages of allowing setting the beam energy and beam longitudinal focusing at once.
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THPME004	Further R&D for a New Superconducting CW Heavy Ion Linac@GSI	3211
	W.A. Barth, S. Mickat GSI, Darmstadt, Germany M. Amberg, K. Aulenbacher, V. Gettmann HIM, Mainz, Germany F.D. Dziuba, H. Podlech, U. Ratzinger IAP, Frankfurt am Main, Germany
	A low energy beam line (1.4 MeV/u) behind the GSI High Charge State Injecor will provide cw-heavy ion beams with high beam intensity. It is foreseen to build a new cw-heavy ion-linac for post acceleration up to 7.3 MeV/u. In preparation an advanced R&D program is defined: The first linac section (financed by HIM and partly by HGF-ARD-initiative) comprising a sc CH-cavity embedded by two sc solenoids will be tested in 2014/15 as a demonstrator. After successful testing the construction of an advanced cryomodule comprising four rf cavities is foreseen. As an intermediate step towards an entire cw-linac the use of a double of two CH-cavities is planned: Ashort 5 cell cavity should be mounted directly behind the demonstrator cavity inside a short cryostat. The design of the cw linac based on shorter sc CH-cavities would minimize the overall technical risk and costs. Besides with this cavity an optimized operation of the whole linac especially with respect to beam quality could be achieved. Last but not least the concept of continuous energy variation applying phase variation between the two cavities with constant beta profile could be tested.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME004
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THPME005	Optimization of an IH-cavity based High Energy Heavy-ion Linac at GSI	3214
	A. Orzhekhovskaya, G. Clemente, L. Groening, S. Mickat, B. Schlitt GSI, Darmstadt, Germany
	A new high energy heavy-ion injector (HE-Linac) for the FAIR project was proposed as replacement for the existing post-stripper linac at the GSI UNILAC. Six 108 MHz IH-type drift-tube linac cavities within a total length of about 24 m accelerate the ions (up to U28+) from 1.4 MeV/u up to 11.4 MeV/u. Fast pulsed quadrupole triplet lenses are used for transverse focusing in between the IH cavities. The optimization of the HE linac with respect to the emittance growth reduction is investigated.
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THPME006	Straight Injection of an intense Uranium Beam into the GSI High Current RFQ	3217
	H. Vormann, A. Adonin, W.A. Barth, L.A. Dahl, P. Gerhard, L. Groening, R. Hollinger, M.T. Maier, S. Mickat, A. Orzhekhovskaya, C. Xiao, S.G. Yaramyshev GSI, Darmstadt, Germany
	A dedicated high current uranium ion source and LEBT will be built at the GSI High Current Injector (HSI), to fulfil the intensity requirements for FAIR (Facility for Antiproton and Ion Research at Darmstadt). This new injection line will be integrated into the existing complex which already comprises two branches. The new LEBT is designed as a straight injection line without dipole magnet, i.e. without dispersive charge state separation. All uranium charge states, coming from the ion source, are transported to the heavy ion high current GSI-HSI-RFQ. Only the design charge state U4+ is accelerated to the final RFQ energy. The new LEBT design is based on beam emittance and current measurements behind the existing ion source. Beam dynamics simulations have been performed with the codes TRACE-3D (envelopes), DYNAMION, BEAMPATH and TRACK (multiparticle). The recent layout of the LEBT, as well as the results of beam dynamics studies are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME006
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THPME007	A Virtual Charge State Separator as an Advanced Tool Coupling Measurements and Simulations	3220
	S.G. Yaramyshev, A. Adonin, W.A. Barth, L.A. Dahl, P. Gerhard, L. Groening, R. Hollinger, M.T. Maier, S. Mickat, A. Orzhekhovskaya, H. Vormann GSI, Darmstadt, Germany
	A new Low Energy Beam Transport (LEBT) for multi-charge uranium beam will be built at GSI High Current Injector. All uranium charge states coming from the new ion source will be injected into GSI heavy ion high current HSI-RFQ, but only design ions U4+ will be accelerated to the final RFQ energy. A detailed knowledge about injected beam- current and -emittance for pure design U4+ ions is necessary for a proper beam line design commissioning and operation, while the measurements are possible only for a full beam including all charge states. Detailed measurements of beam current and emittance are performed behind the first quadrupole triplet at the beam line. A dedicated algorithm, based on combination of measurements and results of an advanced beam dynamics simulations, provides for an extraction of beam- current and -emittance for only U4+ component of a beam. The obtained results and final beam dynamics design for the new straight beam line are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME007
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THPME008	New Reference Design of the European ADS RFQ Accelerator for MYRRHA	3223
	C. Zhang GSI, Darmstadt, Germany H. Podlech IAP, Frankfurt am Main, Germany
	For demonstrating the technical feasibility of nuclear waste transmutation in an Accelerator Driven System (ADS), the MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) proton driver is under intensive studies. Good performance of the 2 – 4 mA, 1.5MeV RFQ (Radio-Frequency Quadrupole), the start of the accelerator chain, is essential to the reliability of the whole facility, so it must be very well designed. On the basis of the first reference design, further improvements with respect to electrode aperture, emittance growths and output distributions have been performed. The simulation results of the new reference design are presented in this paper.
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THPME010	A 325 MHz High Gradient CH – Test Cavity for β=0.16	3229
	A. Almomani, U. Ratzinger IAP, Frankfurt am Main, Germany
	Funding: BMBF, contract no. 05P12RFRB9 This pulsed linac activity aims on compact designs, which means a considerable increase in voltage gain per meter. At IAP – Frankfurt, a CH – cavity was developed for these studies, where mean effective accelerating fields well above 10 MV/m are expected at 325 MHz, β=0.164. This cavity is developed within a funded project. Currently, the cavity is under construction and expected to be ready for copper plating in autumn 2014. The results might influence the rebuilt of the UNILAC – Alvarez section, which aims on achieving the beam intensities specified for the GSI – FAIR project. The new GSI 3 MW Thales klystron test stand will be very important for these investigations. Detailed investigations for two different types of copper plating can be performed on this cavity. In this work, the status of the cavity fabrication will be presented. Moreover, low temperature operation of copper cavities is discussed for the case of very short RF pulses.
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THPME011	First Coupled CH Power Cavity for the FAIR Proton Injector	3232
	R. M. Brodhage, G. Clemente, W. Vinzenz GSI, Darmstadt, Germany R. M. Brodhage, U. Ratzinger IAP, Frankfurt am Main, Germany
	For the research program with cooled antiprotons at FAIR a dedicated 70 MeV, 70 mA proton injector is required. The main acceleration of this room temperature linac will be provided by six CH cavities operated at 325 MHz. Each cavity will be powered by a 2.5 MW Klystron. For the second acceleration unit from 11.5 MeV to 24.2 MeV a 1:2 scaled model has been built. Low level RF measurements have been performed to determine the main parameters and to prove the concept of coupled CH cavities. In 2012, the assembly and tuning of the first power prototype was finished. Until then, the cavity was tested with a preliminary aluminum drift tube structure, which was used for precise frequency and field tuning. In 2013 the final drift tube structure has been welded inside the main tanks and the preparation for copper plating has taken place. This paper will report on the main tuning and commissioning steps towards that novel type of DTL and it will show the latest results measured on a fully operational CH proton cavity shortly before copper plating.
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THPME012	Results of the High Power Test of the 325 MHz 4-Rod RFQ Prototype	3235
	B. Koubek, H. Podlech, A. Schempp, J.S. Schmidt IAP, Frankfurt am Main, Germany
	For the FAIR proton linac at GSI a 325 MHz 4-rod RFQ prototype has been built. On this prototype RF measure- ments have been carried out. After low power conditioning in cw mode the structure was high power tested in pulsed mode. During the performance tests the 6 stem prototype was optimized and has shown the feasibility of a dipole free 4-rod RFQ at high frequencies and was testet up to 120 kW per meter. In this tests the input power and the electrode voltage was observed using gamma spectroskopy. From this the shunt impedance was calculated and compared to other methods of measurements. The power test results are presented in this paper.
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THPME013	Field Optimized 4-rod RFQ Model	3238
	J.S. Schmidt, B. Koubek, A. Schempp IAP, Frankfurt am Main, Germany
	The performance of an RFQ in case of its beam quality and transmission is in the basis dependent on the conformity of the field distribution of the manufactured structure with the one of its particle dynamic design. In the last years studies have been performed on the influence of various elements of the 4-rod RFQ on its field distribution. In particular the tuning process of the 4-rod RFQ with its tuning plates has been optimized. These studies have been complemented with detailed simulations on the fringe fields at the end of the electrodes and the conformity of the fields along the structure as well as the influence of other tuning elements like the piston tuner. Based on the findings of this research a proposal for a field optimized 4-rod RFQ model has been developed and will be presented in this paper.
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THPME014	Beam Dynamics in the LEBT for FRANZ	3241
	P.P. Schneider, H. Dinter, M. Droba, O. Meusel, D. Noll, T. Nowottnick, O. Payir, H. Podlech, A. Schempp, C. Wiesner IAP, Frankfurt am Main, Germany
	The two Low Energy Beam Transport (LEBT) sections of the accelerator-driven neutron source FRANZ* consist of four solenoids. The first section with two solenoids will match the 120 keV proton beam into a chopper system**. Downstream from the chopper system a second section with two more solenoids will match the beam into the acceptance of the following RFQ. The accelerator will be operated using either a 2 mA dc beam or a pulsed beam with intensities from 50 mA to 200 mA at 250 kHz repetition rate. The high intensity of these ion beams requires the consideration of space-charge effects. Particle simulations with varying parameter sets have been performed in order to determine the settings providing best transmission and beam quality. Loss profiles along the transport channel were computed to identify hotspots. Simulation results for best transmission at lowest emittance growth will be presented. * O. Meusel et al., Proc. of LINAC12, Tel-Aviv, Israel, MO3A03 ** C. Wiesner et al., Proc. of IPAC2012, New Orleans, LA., USA, THPPP074
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME014
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THPME015	Experimental Performance of an E×B Chopper System	3244
SUSPSNE042	use link to see paper's listing under its alternate paper code
	C. Wiesner, H. Dinter, M. Droba, O. Meusel, D. Noll, T. Nowottnick, O. Payir, U. Ratzinger, P.P. Schneider IAP, Frankfurt am Main, Germany
	Beam operation of an E×B chopper system has started in the Low-Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ*. The chopper is designed for low-energy high-perveance beams and high repetition rates. It combines a static magnetic deflection field with a pulsed electric compensation field in a Wien filter-type E×B configuration**. Helium ions with 14 keV energy were successfully chopped at the required repetition rate of 257 kHz. The maximum chopped beam intensity of 3.5 mA, limited by the given test ion source, corresponds to a generalized perveance of 2.7·10-3. For the design species and energy, 120 keV protons, this is equivalent to a beam current of 174 mA. Beam pulses with rise times of 120 ns, flat top lengths of 85 ns to 120 ns and Full Width at Half Maximum (FWHM) between 295 ns and 370 ns were experimentally achieved. * U. Ratzinger et al., Proc. of IPAC2011, San Sebastián, Spain, WEPS040. ** C. Wiesner et al. Proc. of IPAC2012, New Orleans, LA., USA, THPPP074.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME015
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THPME016	Experimental Results on SCDTL Structures for Protons	3247
	L. Picardi, A. Ampollini, G. Bazzano, P. Nenzi, C. Ronsivalle, V. Surrenti, M. Vadrucci ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini URLS, Rome, Italy
	The medium-energy section of the proton linear accelerator for radiotherapy under realization in the framework of the TOP-IMPLART Project consists in a high frequency 7-35 MeV SCDTL (Side Coupled Drift Tube Linac) structure. The structure, made of 4 modules supplied by one klystron, has been completely designed. The first module up to 11.6 MeV has been built and is under commissioning at ENEA-Frascati and the second and third modules are under realization. The paper describes the system and presents the main results of the experimental activity on this part of the accelerator.
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THPME017	Electromechanical Analysis of SCDTL Structures	3250
	M. Ciambrella, F. Cardelli, M. Migliorati, A. Mostacci, L. Palumbo URLS, Rome, Italy L. Ficcadenti, V. Pettinacci INFN-Roma, Roma, Italy L. Picardi, C. Ronsivalle ENEA C.R. Frascati, Frascati (Roma), Italy
	The Side Coupled Drift Tube Linac (SCDTL) is a 3 GHz accelerating structure for proton therapy linac designed for TOP-IMPLART, an Intensity Modulated Proton Linear Accelerator for Radio-Therapy. The structure is made up of short DTL accelerating tanks for low current proton beams, coupled by side coupling cavities. The purpose of this paper is to report on the analysis of electromagnetic and the thermo-mechanical behavior for the SCDTL structure. The 3D electromagnetic analysis is used to derive the power dissipation on the structure; then one can infer the temperature distribution and deformation field in order to eventually evaluate their feedback on the electromagnetic properties of the structure as, for instance, the cavity resonant frequency shift. Such a "multi-physics'' analysis has been performed for different supporting stem geometries in order to optimize the shunt impedance and the R/Q for SCDTL cavities.
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THPME018	Global Search Methods for Electromagnetic Optimization of Compact Linac Tanks	3253
	O. Losito, V. Dimiccoli, G. Rutigliani ITEL, Ruvo di Puglia, Italy L. De Palma, F. Prudenzano Politecnico di Bari (DEI), Bari, Italy
	We shows the optimization of a five cell tank to be included as first multi-cavity within a LINAC section accelerating a proton beam from 7 MeV to higher energies, useful for proton therapy. The tank performance depends on a set of physical (beam characteristics) and geometrical parameters (radius and lengths of accelerating and coupling cavities, radius and thickness of the coupling holes among accelerating cells, the radius and the thickness of the coupling holes between off-axis coupling cells and accelerating ones). PSO (Particle Swarm Optimization) and ACO (Ant Colony Optimization) have been used as approaches for the electromagnetic optimization. The model used for the fitness calculation takes into account all the most important effects occurring in the tank coupled cavities loaded by the proton beam. The codes based on PSO and ACO have enabled the global and stochastic identification of about ten optimized parameters. The design goodness has been tested via Particle and Microwave CST Studio © simulation. The optimized tank accelerates the proton beam input energy from Ein=7 MeV to about Eout= 8.2 MeV. These values, well agree with other designs reported in literature.
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THPME019	LIPAc, the 125mA / 9MeV / CW Deuteron IFMIF’s Prototype Accelerator: What Lessons Have We Learnt from LEDA?	3256
	F. Scantamburlo, J. Knaster, Y. Okumura IFMIF/EVEDA, Rokkasho, Japan N. Chauvin, R. Gobin, P.A.P. Nghiem CEA/DSM/IRFU, France A. Kasughai, H. Shidara Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
	The Engineering Validation and Engineering Design Activities (EVEDA) phase of IFMIF aims at running a 9 MeV / 125 mA / CW deuteron accelerator to demonstrate the feasibility of IFMIF’s 40 MeV / 125 mA / CW accelerator with components mainly designed and constructed in European labs. LEDA was operated successfully in 1999-2001 as a 6.7 MeV / 100 mA / CW proton accelerator with high availability. The present paper assesses the experience gained in LEDA and explains how LIPAc, the IFMIF prototype accelerator, is inheriting its role of breaking through technological boundaries.
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THPME020	Local Compensation-rematch for the C-ADS Accelerator Element Failures with Space Charge	3259
SUSPSNE040	use link to see paper's listing under its alternate paper code
	B. Sun, C. Meng, J.Y. Tang, F. Yan IHEP, Beijing, People's Republic of China
	In order to achieve the required reliability and availability for the C-ADS accelerator, a fault tolerance design is pursued. The effects of cavity and solenoid failure in different locations have been studied and the schemes of compensation by means of local compensation have been investigated. After one cavity failure, by adjusting the settings of the neighbouring cavities and the focusing elements we can make sure that the Twiss parameters and energy are approximately recovered to that of the nominal ones at the matching point. However, the compensation work above is based on the TraceWin code, which has not considered the phase compensation, a code based on MATLAB is under developing to compensate the arrival time at the matching point that the linear space charge effect has also considered.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME020
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THPME021	Designs of High-intensity Proton Linacs with Non-equipartitioning	3262
	C. Meng, Z. Li, S. Pei, B. Sun, J.Y. Tang, F. Yan IHEP, Beijing, People's Republic of China R. Garoby, F. Gerigk, A.M. Lombardi CERN, Geneva, Switzerland
	Superconducting technology is playing more and more important roles in high-power proton linacs. Periodic phase advance less than 90 degrees and equipartitioning design are considered very important principles in linac design. Due to the very high construction and operation costs, it is very important in optimizing the design to lower the costs. In usual, the longitudinal emittance is larger from the front-end, thus the transverse phase advance is designed to have a larger value. However, with the technical advancement, higher accelerating field can be obtained. In order to take this advantage, it is of much interest in increasing the longitudinal phase advance to shorten the linac or reduce the cost. In this paper, we present the design method that keeping the longitudinal phase advance as large as possible but smaller than 90 degree to maximize the use of the available accelerating gradient. Even though this method does not observe the equipartitioning condition, we can also obtain very good beam dynamics results by placing the tunes in resonant-free regions. In this paper, the design and simulation results by applying this method to the SPL and China-ADS linac will be present.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME021
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THPME022	Recent Progress of the SSC-LINAC RFQ	3265
	G. Liu, J.E. Chen, S.L. Gao, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu PKU, Beijing, People's Republic of China H. Du, Y. He, P. Jiang, X.N. Li, Z.S. Li, J.X. Wu, J.W. Xia, Y.Q. Yang, X. Yin, Y.J. Yuan, X.H. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	Funding: NFSC(11079001) The project of SSC-LINAC RFQ has important progresses in the past year. The machine has been moved to the Institute of Modern Physics in the first season of 2013. The cavity measurement including tests of RF performance and field distribution is carried out again in the laboratory. The Q0 is 6440, and the unflatness of the electric field in longitudinal is ±2.5%. The results demonstrated a good agreement with simulation. The RF and beam commissioning of the RFQ has been carried out in the first half of 2014. The duty factor rose from 5% to CW gradually. By now, the cavity has been operated with 35 kW on CW mode. The measurement of the bremsstrahlung spectrum reveals that the 35 kW power is needed to generate the 70 kV inter-vane voltage. The beam transmission efficiency and energy spread has been obtained in beam commissioning by accelerating 16O5+ and 40Ar8+ beams. The efficiency of 40Ar8+ is as high as 94%, and the output energy is 142.78 keV/u. All the processes and results of the experiments will be discussed in details.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME022
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THPME023	CPHS Linac Status at Tsinghua University	3268
	Q.Z. Xing, C. Cheng, L. Du, T. Du, X. Guan, C. Jiang, X.W. Wang, H.Y. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China W.Q. Guan, Y. He, J. Li NUCTECH, Beijing, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China (Major Research Plan Grant No. 91126003 and 11175096). We present, in this paper, the operation status of the 3 MeV high current proton Linac for the Compact Pulsed Hadron Source (CPHS) at Tsinghua University. Proton beam with the peak current of 30 mA, pulse length of 100 μs and repetition rate of 50 Hz has been delivered to the Beryllium target to produce the neutron since July 2013. The pulse length will be further increased to 500 μs. The proton beam energy is expected to be enhanced to the designed value of 13 MeV after the Drift Tube Linac is ready in 2015.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME023
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THPME024	Cooling Design for the FRIB RFQ Cavity at Michigan State University	3271
	J. Zeng, L. Du, X. Guan, Q.Z. Xing, S.X. Zheng TUB, Beijing, People's Republic of China W.Q. Guan, J. Li NUCTECH, Beijing, People's Republic of China
	Funding: Work supported by the Major Research plan of the National Natural Science Foundation of China (Grant No. 91126003) We present, in this paper, the cooling design for the Radio Frequency Quadrupole (RFQ) cavity of the Facility for Rare Isotope Beams (FRIB) at Michigan State University. The locations and radius of the cooling passages are optimized, which exist in the five-meter-long copper cavity, tuners, dipole-mode stabilizing rods and end-plates. A three-dimensional RF, thermal, and structural analysis by ANSYS has been performed to carry out the design and verify that the present design can meet the requirement for water velocity, stress, deformation and frequency shift.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME024
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THPME025	Low Power Test of a Hybrid Single Cavity Linac	3274
	L. Lu, Y. He, Q. Jin, C.X. Li, G. Pan, A. Shi, L.B. Shi, L.T. Sun, L.P. Sun, Z.L. Zhang, H.W. Zhao, H. Zhao IMP, Lanzhou, People's Republic of China T. Hattori NIRS, Chiba-shi, Japan N. Hayashizaki RLNR, Tokyo, Japan
	We fabricated and assembled a hybrid single cavity (HSC) linac which is formed by combining a radio frequency quadrupole (RFQ) structure and a drift tube (DT) structure into one interdigital-H (IH) cavity. ]. The HSC linac was designed as an injector for a cancer facility and was able to be used as a neutron source for boron neutron capture therapy. The injection method of the HSC linac used a direct plasma injection scheme (DPIS), which is considered to be the only method for accelerating a high current heavy ion beam produced by a laser ion source. The input beam current was designed to be 20 mA, which could be produced by a laser ion source. According to the simulations and calculations, the HSC linac could accelerate a 6-mA C6+, beam which satisfies the particle number criteria for cancer therapy use (108~9 ions/pulse). Details of the measurements and evaluations of the assembled HSC linac, and details of a DPIS test using a laser ion source are reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME025
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THPME026	The R&D Status of SSC-LINAC	3277
	X. Yin, H. Du, Y. He, P. Jiang, X.N. Li, L.Z. Ma, J. Meng, L.T. Sun, H. Wang, J.W. Xia, Z. Xu, Y.Q. Yang, Q.G. Yao, Y.J. Yuan, X.H. Zhang, X.Z. Zhang, H.W. Zhao, Z.Z. Zhou IMP, Lanzhou, People's Republic of China J.E. Chen, S.L. Gao, G. Liu, Y.R. Lu, X.Q. Yan, K. Zhu PKU, Beijing, People's Republic of China
	A powerful heavy ion injector SSC-linac is under constructing at IMP in Lanzhou. The continuous wave (CW) 4-rod RFQ operating at 53.667 MHz has been developed as the low beam energy injector linac. The 40Ar8+ ion beam extracted from the ECR ion source was used for the RFQ commissioning. The particle energy 142.8 keV/u and the 198 euA beam current were measured at the exit of RFQ with the 94% transmission. In this paper, the recent R&D progress of the SSC-LINAC including the development of key components and the beam commissioning results are presented.
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THPME027	Development of the injector II RFQ for China ADS project	3280
	Z.L. Zhang, Y.H. Guo, Y. He, H. Jia, C.X. Li, Y. Liu, L. Lu, G. Pan, A. Shi, L.B. Shi, L.P. Sun, W.B. Wang, X.W. Wang, J.X. Wu, Q. Wu, X.B. Xu, B. Zhang, J.H. Zhang, H.W. Zhao, T.M. Zhu IMP, Lanzhou, People's Republic of China M.D. Hoff, A.R. Lambert, D. Li, J.W. Staples, S.P. Virostek LBNL, Berkeley, California, USA C. Zhang GSI, Darmstadt, Germany
	As one of the main components of the injector II of China ADS LINAC project, an RFQ working at 162.5MHz is used to accelerate proton beams of 15mA from 30 keV to 2.1 MeV. The four vane RFQ has been designed in collaboration with Lawrence Berkeley National Laboratory and built at the workshop of the Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS). Low power test of the cavity have been completed, and it shows the field flatness is within ±1% and the unloaded Q is 12600. RF conditioning has been completed, results of preliminary beam test show the output beam energy is 2.16 MeV with energy spread of 3.5% and the transmission efficiency is 97.9%. Continuous wave (CW) beam of 2.3 mA has been accelerated for more than one hour.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME027
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THPME029	Upgrade of Heavy Ion Injector for ITEP-TWAC Facility	3283
	V. Andreev, N.N. Alexeev, A.I. Balabin, M.M. Kats ITEP, Moscow, Russia A.A. Metreveli MEPhI, Moscow, Russia
	A new scheme of heavy ion injector I-3 designed for improvement of accelerated beam parameters has been proposed for ITEP-TWAC Facility. It is based on the usage of two quarter-wave double gap resonators operated on 5 MHz with accelerating voltage of 3 MV per gap. Existing 2.5 MHz double gap resonator will be retuned for operational frequency of 5 MHz and new additional one will be built. The new injector optimized for acceleration of heavy ions with A/Z in the range of 3-10 will allow accelerating any ions from C to U with beam current up to10 mA. Results of both electrodynamics and beam dynamics simulations of the accelerating structures are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME029
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THPME030	Beam Dynamics and Accelerating Cavity Electrodynamics' Simulation of CW 2 MeV Proton RFQ	3286
	S.M. Polozov, A.E. Aksentyev, T. Kulevoy MEPhI, Moscow, Russia
	The CW proton linac has a number of important applications; serving as the initial part of a high-energy, high-power linac for an accelerator-driven system is the main of them. Its CW operation mode and a 5-10 mA beam current, however, are limiting factors for the accelerating field. The surface field should not exceed the Kilpatrick field by more than 1.2-1.5 times. This limitation leads to the increase in linac length and beam bunching complexity. The first results of a 2 MeV, 5 mA, CW RFQ, designed for the operating frequency of 162 MHz, are discussed. Beam dynamics simulation results, obtained by using the BEAMDULAC-RFQ code*, are presented. The electrodynamics of the accelerating structure based on the four-vane cavity is discussed. The accelerating cavity design uses coupling windows as was proposed earlier **, but with windows of an elliptical form. Such form allows for better separation of quarupole and dipole modes. * S.M. Polozov. Problems of Atomic Science and Technology. Series: Nuclear Physics Investigations, 3 (79), 2012, p. 131-136. ** V.A. Andreev. Patent US5483130, 1996.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME030
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THPME031	Beam Dynamics Simulation in SC Linac for the Proton Radiotherapy	3289
	S.M. Polozov, I.A. Ashanin, A.V. Samoshin MEPhI, Moscow, Russia
	Superconducting linear accelerators based on short independently phased SC cavities are widely used today in ADS and FRIB. Such accelerator can be useful as proton therapy beam source*. The accelerator general layout to accelerate proton beam at the energy range 2-240 MeV will detail in this report. Obviously, in this linac will always violate the principle of synchronicity when the synchronous particle velocity is equal to the phase velocity of the accelerating wave and a slipping of particles relative to the accelerating wave. The beam dynamics simulation shows that linac should consist of four groups of identical cavities. Cavities should have phase velocities as βg=0.1, 0.18, 0.3 and 0.49 respectively. The choice of optimum parameters of accelerating cavities and focusing magnets will discussed and the beam dynamics simulation results will presented. *S.M. Polozov, A.V. Samoshin. Proc. of LINAC’12, pp. 633-635
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THPME032	Beam Transfer Studies for LINCE Experimental Areas	3292
	L. Acosta, C. Bonțoiu, I. Martel, A.R. Pinto Gómez, A.C.C. Villari University of Huelva, Huelva, Spain J. Lucas Elytt Energy, Madrid, Spain A.C.C. Villari FRIB, East Lansing, Michigan, USA
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. Beam transport from the exit of the LINCE linac to experimental areas has been optimized for a few ion species using transfer matrix calculations performed in MADX. An alpha spectrometer based on a double-bending achromat lattice has been used as dispersion suppressor and particle tracking studies have been carried out in GPT along it and the three beamlines. Realistic quadrupole and dipole magnet design achieved in Comsol enabled accurate particle tracking studies and evaluation of the beam parameters delivered at the target.
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THPME033	Particle Tracking Studies for the LINCE SC Linac	3295
	C. Bonțoiu, I. Martel University of Huelva, Huelva, Spain A. Falone TTI, Santander, Spain C. Gómez IDOM, Bilbao, Spain
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. LINCE facility makes use of a low-energy ion linac consisting of quarter-wave resonators designed for β = 0.045, 0.077 and 0.15 (72.75 and 109.125 MHz), and shielded solenoid magnets distributed along four different cryomodules. Particle tracking studies have been performed along the linac using realistic electric and magnetic field maps with and without space charge effects to prove a final energy of 8.5 and 45 MeV/u respectively for uranium ions and protons.
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THPME035	High-performance Accelerating Cryomodule for the LINCE Project	3298
	D. Gordo-Yáñez, R. Carrasco Dominguez, I. Martel, A.R. Pinto Gómez University of Huelva, Huelva, Spain C. Gómez IDOM, Bilbao, Spain
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. The linear accelerator of LINCE consists on 26 superconducting quarter-wave resonators with three different geometric betas working at 72.75 and 109.125 MHz and three types of SC solenoids. In this paper we discuss the first cryomodule design based on thermal and mechanical studies carried out in COMSOL Multiphysics. This includes the design of cavity and solenoid cryostats, liquid-helium reservoir and layout of the cryogenic tank.
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THPME036	ECOS-LINCE: A High Intensity Multi-ion Superconducting Linac for Nuclear Structure and Reactions	3301
	I. Martel, L. Acosta, R. Carrasco Dominguez, J.A. Dueñas, A.K. Orduz, A. Peregrin, J. Prieto-Thomas, J. Sanchez-Segovia, A.C.C. Villari University of Huelva, Huelva, Spain F. Azaiez IPN, Orsay, France G. De Angelis INFN/LNL, Legnaro (PD), Italy M. Lewitowicz GANIL, Caen, France A. Maj IFJ-PAN, Kraków, Poland P.N. Ostroumov ANL, Argonne, Illinois, USA A.C.C. Villari FRIB, East Lansing, Michigan, USA
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. During the past ten years, ECOS working group and users strongly supported the construction of a dedicated high-intensity stable-ion-beam facility in Europe, with energies at and above the Coulomb barrier as part of the Long-Range Plan of the Nuclear-Physics community. LINCE will be a multi-user facility dedicated to ECOS science: fundamental physics, astrophysics, nuclear structure and reaction dynamics. Applied research is foreseen in the fields of medical physics, aerospace and material sciences with energetic heavy ions. The facility will produce a wide range of ions, from protons (45 MeV) up to Uranium (8.5 MeV/u) with 1mA maximum beam intensity. A very compact linac has been designed by using a HV platform with a double-frequency ECR ion source, multi-harmonic buncher, an innovative CW RFQ design (1 ≤A/Q ≤ 7) and 26 accelerating cavities made of bulk niobium (β = 0.045, 0.077 and 0.15) working at 72.75 and 109.125 MHz. This article gives an outline of the accelerator complex from the ion source to the experimental areas, and presents its research potential and the relevant physics instrumentation.
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THPME037	Development of a 72.75 MHz RFQ for the LINCE Accelerator Complex	3304
SUSPSNE039	use link to see paper's listing under its alternate paper code
	A.K. Orduz, C. Bonțoiu, I. Martel, A.C.C. Villari University of Huelva, Huelva, Spain A. Garbayo AVS, Elgoibar, Spain P.N. Ostroumov ANL, Argonne, Illinois, USA A.C.C. Villari FRIB, East Lansing, Michigan, USA
	Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA. Low-energy acceleration for the LINCE project [1] will be achieved using a 72.75 MHz normal conducting four vanes RFQ designed to give a 460 keV/u boost for A/Q = 7 ions in about 5 m. The vanes are modeled to accommodate windows for a clear separation of the RFQ modes and easy fitting to an octagonal resonance chamber. This article presents the main numerical results of the radio-frequency modeling and computational fluid dynamics (CFD). Particle tracking studies optimized for bunching and acceleration are shown as well. [1] I. Martel et al., “LINCE: A High Intensity Multi-ion Superconducting Linac for Nuclear Structure and Reactions”, IPAC’14, Dresden, Germany, June 2014, THPME036, These Proceedings.
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THPME038	Low Power RF Characterization of ESS Bilbao RFQ Cold Model	3308
	N. Garmendia, I. Bustinduy, O. González, P.J. González, I. Madariaga, L. Muguira, J.L. Muñoz ESS Bilbao, Zamudio, Spain A.V. Vélez HZB, Berlin, Germany
	In order to test both the design and manufacturing procedures of the final ESS-Bilbao RFQ, a 1 meter long RFQ Cold Model, including a longitudinal vane modulation, has been manufactured in aluminium. Low power RF measurements have been performed to obtain the main figures of merit of the cavity, including: frequency spectrum, coupling and quality factors, tuning range, RF sealing effect and the accelerating field profile. The experimental and simulated results are explained and analyzed.
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THPME039	Requirements for ESS Superconducting Radio Frequency Linac	3311
	C. Darve, M. Eshraqi, D.P. McGinnis, S. Molloy, E. Tanke ESS, Lund, Sweden
	The European Spallation Source (ESS) is a pan-European project. It will be built by at least 17 European countries, with Sweden and Denmark as host nations. The Superconducting Radio-Frequency (SRF) linac is composed of one section of spoke cavity cryomodules (352.21 MHz) and two sections of elliptical cavity cryomodules (704.42 MHz). These cryomodules contain niobium SRF cavities operating at 2 K. Following a redesign of its accelerator, SRF linac design shall comply with a new set of requirement, like an increase of the beam current from 50 mA to 62.5 mA and an increase of the peak electrical surface field from 40 MV/m to 45 MV/m. Requirements and the main disciplines needed to construct this portion of the linac are presented.
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THPME041	ESS DTL Status: Redesign and Optimizations	3314
	R. De Prisco, M. Eshraqi ESS, Lund, Sweden M. Comunian, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy A.R. Karlsson Lund University, Lund, Sweden
	The European Spallation Source (ESS) uses a linear accelerator to deliver the high intensity proton beam to the target station. The average beam power is 5 MW with a peak beam power at target of 125 MW. In 2013 the ESS linac was costed and to meet the budget some modifications were introduced: the final energy was decreased from 2.5 GeV to 2.0 GeV and the beam current was increased from 50 mA to 62.5 mA to keep the same beam power. As a consequence the ESS Drift Tube Linac, DTL, has been re-designed to match the new requirements. This paper presents the main Radio Frequency (RF) and beam dynamics choices for the ESS DTL.
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THPME042	Preliminary Functional Analysis and Operating Modes of ESS 704 MHz Superconducting Radio-Frequency Linac	3317
	N. Elias, C. Darve, J. Fydrych, A. Nordt, D.P. Piso ESS, Lund, Sweden
	The European Spallation Source (ESS) is one of Europe’s largest planned research infrastructures. The project is funded by a collaboration of 17 European countries and is under design and construction in Lund, Sweden. Three families of Superconducting Radio-Frequency (SRF) cavities are being prototyped, counting the spoke resonators with a geometric beta of 0.5, medium-beta elliptical cavities (β=0.67) and high beta elliptical cavities (β=0.86). The ESS linac will produce 2.86 ms long proton pulses with a repetition rate of 14 Hz (4 % duty cycle), a beam current of 62.5 mA and an average beam power of 5 MW. A control system is being developed to operate the different accelerator systems. All operating modes of the superconducting linac shall ensure a safe operation of the accelerator. This paper presents the preliminary functional analysis and the operating modes of the 704 MHz SRF linac.
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THPME043	The ESS Linac	3320
	M. Eshraqi, H. Danared, R. De Prisco, M. Lindroos, D.P. McGinnis, R. Miyamoto, M. Muñoz, A. Ponton, E. Sargsyan ESS, Lund, Sweden I. Bustinduy ESS Bilbao, Bilbao, Spain L. Celona INFN/LNS, Catania, Italy M. Comunian, F. Grespan INFN/LNL, Legnaro (PD), Italy S.P. Møller, H.D. Thomsen ISA, Aarhus, Denmark
	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. During last year the ESS linac was costed, and to meet the budget a few modifications were introduced to the linac design. One of the major changes is the reduction of final energy from 2.5~GeV to 2.0~GeV and therefore beam current was increased accordingly to compensate for the lower final energy. As a result the linac is designed to meet the cost objective by taking a higher risk. This paper focuses on the driving forces behind the new design, engineering and beam dynamics requirements of the design and finally on the beam dynamics performance of the linac.
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THPME044	Statistical Error Studies in the ESS Linac	3323
	M. Eshraqi, R. De Prisco, R. Miyamoto, E. Sargsyan ESS, Lund, Sweden H.D. Thomsen ISA, Aarhus, Denmark
	Following the completion of the latest layout of the ESS linac statistical error studies have been performed to define the field vector quality and alignment tolerances. Based on these tolerances and error study results a scheme for the correction system is proposed that assures low losses and permits hands-on maintenance. This paper reports on the strategy of simulating and performing the error studies as well as setting the tolerances.
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THPME045	Beam Physics Design of the ESS Medium Energy Beam Transport	3326
	R. Miyamoto, B. Cheymol, M. Eshraqi ESS, Lund, Sweden I. Bustinduy ESS Bilbao, Bilbao, Spain
	A radio frequency quadrupole (RFQ) and drift tube linac (DTL) in the ESS proton linac are connected with a medium energy beam transport (MEBT) to remove low intensity bunches on the head and tail of a macro-pulse with a chopper and house diagnostic devices to characterize and adjust the beam out of the RFQ for the DTL. These must be achieved within a relatively short space and without large degradation of beam quality due to space charge force, imposing a challenge on the lattice design. This paper presents a beam physics design of the MEBT in the ESS proton linac, which satisfies its requirement while preserving a decent beam quality.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME045
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THPME047	Sorting in the ESS	3329
	S. Peggs, E. Laface, E. Sargsyan, R. Zeng ESS, Lund, Sweden
	Sorting optical elements has significant potential during the construction of superconducting linacs like the ESS, in the same way that it has proved to be very effective in circular accelerators like RHIC and the LHC. In the linac domain, the elements of primary interest are cavities and cryomodules, instead of the magnets (of all sorts) that are routinely sorted in circular accelerators. Multiple cavities can be sorted to optimise individual cryomodules, and cryomodules can be sorted into optimised locations within the tunnel. Different sorting strategies are discussed and preliminarily evaluated in this paper. Central to the evaluation is the identification of goal (or penalty) functions that are maximised (or minimised), and which can be rapidly quantified by simulation. Also crucial is the availability of a modeling system that is realistic in its complex representation of the linac, and which can easily be modified and developed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME047
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THPME048	Status and Plans for Linac4 Installation and Commissioning	3332
	M. Vretenar, A. Akroh, L. Arnaudon, P. Baudrenghien, G. Bellodi, J.C. Broere, O. Brunner, J.F. Comblin, J. Coupard, V.A. Dimov, J.-F. Fuchs, A. Funken, F. Gerigk, E. Granemann Souza, K. Hanke, J. Hansen, I. Kozsar, J.-B. Lallement, L. Lenardon, J. Lettry, A.M. Lombardi, C. Maglioni, Ø. Midttun, B. Mikulec, D. Nisbet, M.M. Paoluzzi, U. Raich, S. Ramberger, F. Roncarolo, C. Rossi, J.L. Sanchez Alvarez, R. Scrivens, J. Tan, C.A. Valerio, J. Vollaire, R. Wegner, S. Weisz, M. Yarmohammadi Satri, F. Zocca CERN, Geneva, Switzerland
	Linac4 is a normal conducting 160 MeV H− linear accelerator presently being installed and progressively commissioned at CERN. It will replace the ageing 50 MeV Linac2 as injector of the PS Booster (PSB), increasing at the same time its brightness by a factor of two thanks to the higher injection energy. This will be the first step of a program to increase the beam intensity in the LHC injectors for the needs of the High-Luminosity LHC project. After a series of beam measurements on a dedicated test stand the 3 MeV Linac4 front-end, including ion source, RFQ and a beam chopping line, has been recommissioned at its final position in the Linac4 tunnel. Commissioning of the following section, the Drift Tube Linac, is starting. Beam commissioning will take place in steps of increasing energy, to reach the final 160 MeV in 2015. An extended beam measurement phase including testing of stripping equipment for the PSB and a year-long test run to assess and improve Linac4 reliability will take place in 2016, prior to the connection of Linac4 to the PSB that will take place during the next long LHC shut-down.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME048
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THPME049	TAC Proton Accelerator Facility: Normal Conducting Part	3335
	E. Algin Eskisehir Osmangazi University, Eskisehir, Turkey B. Akkus, L. Sahin Istanbul University, Istanbul, Turkey H. Cetinkaya Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey
	The Turkish Accelerator Center Proton Accelerator Facility (TAC PAF) based on a 1 MW, 2 GeV proton linac will include both normal conducting and superconducting accelerator structures. The project is currently in the technical design phase. The normal conducting part of the TAC PAF will consist of an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line, and two drift tube linac structures in order to accelerate the beam up to 65 MeV. Acceleration from 65 MeV up to 150 MeV and then 2 GeV energy will be provided by a SC-spoke cavity and two SC-elliptical cavities, respectively. In the long term, TAC PAF will be used as a neutron source. The accelerator structures, their design, and possible experimental stations of TAC PAF project will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME049
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THPME050	SPP Beamline Design and Beam Dynamics	3338
	G. Turemen, B. Yasatekin Ankara University, Faculty of Sciences, Ankara, Turkey A. Alacakir SNRTC, Ankara, Turkey M. Celik, Z. Sali Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey Ö. Mete UMAN, Manchester, United Kingdom G. Unel UCI, Irvine, California, USA V. Yildiz Bogazici University, Bebek / Istanbul, Turkey
	The Radio Frequency Quadrupole (RFQ) of SNRTC Project Prometheus (SPP) will be a demonstration and educational machine which will accelerate protons from 20 keV to 1.5 MeV. The project is funded by Turkish Atomic Energy Authority (TAEK) and it will be located at Saraykoy Nuclear Research and Training Center (SNRTC) in Ankara. The SPP beamline consists of a multi-cusp H+ ion source, a Low Energy Beam Transport (LEBT) line and a four-vane RFQ operating at 352.2 MHz. The design studies for the multi-cusp ion source (RF or DC) were performed with IBSimu and SIMION software packages. The source has already been produced and currently undergoes extensive testing. There is also a preliminary design for the solenoid based LEBT, POISSON and PATH were used in parallel for the preliminary design. Two solenoid magnets are produced following this design. The RFQ design was made using LIDOS. RFQ.Designer and it was crosschecked with a home-grown software package, DEMIRCI. The initial beam dynamics studies have been performed with both LIDOS and TOUTATIS. This paper discusses the design of the SPP beamline focusing on the RFQ beam dynamics.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME050
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THPME051	Preparatory Investigations for a Low Frequency Prebuncher at ReA	3342
	D.M. Alt, J.F. Brandon, D. Leitner, D. Morris, M.J. Syphers, N.R. Usher, W. Wittmer NSCL, East Lansing, Michigan, USA
	The ReA reaccelerator facility at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) will provide a unique capability to study reactions with low-energy beams of rare isotopes. A beam from the coupled cyclotron facility is stopped in a gas stopping system, charge bred in an Electron Beam Ion Trap (EBIT), and then reaccelerated in a compact superconducting LINAC. At present the beam repetition rate at the ReA targets is the same as the LINAC RF frequency of 80.5 MHz. A lower frequency would be desirable for many types of experiments using time of flight data acquisitions. Studies were undertaken to investigate possible methods of reducing the beam frequency with minimal reduction in overall beam current. This paper reports the results of preliminary design studies of such a low frequency prebuncher designed to increase the pulse separation and minimize bunch lengths at the detector.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME051
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THPME052	Measurement of the Longitudinal Acceptance of the ReA RFQ	3346
	D.M. Alt, S.W. Krause, A. Lapierre, D. Leitner, S. Nash, R. Rencsok, J.A. Rodriguez, M.J. Syphers, W. Wittmer NSCL, East Lansing, Michigan, USA
	The ReA reaccelerator facility at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) will provide a unique capability to study reactions with low-energy beams of rare isotopes. A beam from the coupled cyclotron facility is stopped in a gas stopping system, charge bred in an Electron Beam Ion Trap (EBIT), and then reaccelerated in a compact superconducting LINAC. The beam is injected into the LINAC by a room-temperature Radio Frequency Quadrupole (RFQ) combined with an external Multiharmonic Buncher. (MHB) In preparation for future upgrades to the capabilities of the ReA, an accurate determination of the longitudinal acceptance of the RFQ was conducted using a stable ion beam from a test source. This paper presents the results of the acceptance measurement, including empirical confirmation of a predicted asymmetry in the shape of the acceptance window.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME052
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THPME053	Cost Rationales for an SRF Proton Linac	3349
	F. Marhauser Muons, Inc, Illinois, USA
	Rationales to assess and minimize costs for a Superconducting Radio Frequency (SRF) proton linac are outlined. Operating frequency, velocity profile and temperature are regarded as variables when applicable. Hardware plus labor costs for cavities and cryomodules as well as expenditures for facility infrastructures including cryogenic systems, conventional facilities, and relevant subsystems are estimated. The focus is on the assessment of a 10 MW, 1 GeV Continuous Wave (CW) linac for an Accelerator Driven Subcritical Reactor (ADSR)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME053
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THPME148	Beam Dynamics Issues for a Superconducting Linear Accelerator-based High Power Heavy Ion Machine	3602
SUSPSNE038	use link to see paper's listing under its alternate paper code
	J.G. Hwang, E.-S. Kim Kyungpook National University, Daegu, Republic of Korea H. Jang, D. Jeon, H.J. Kim, H.J. Kim IBS, Daejeon, Republic of Korea
	The driver linac of RAON heavy ion accelerator based on the superconducting technology, which consists of a 28 GHz ECR ion source, a low energy beam transport line, a RFQ accelerator, a medium energy beam transport line, a low energy linac(SCL1), a charge stripping section and a high energy linac(SCL2), will produce the stable ion beam from proton with 600 MeV to uranium with 200 MeV/u. Many beam dynamics issues such as beam steering effect due to QWR cavities with the peak electric field of 35 MV/m, emittance growth in charge stripper due to the straggling effect, parametric resonance and envelope instability were verified to design the high power heavy ion machine which can produce the high quality beam. In this presentation, we explain our study results for achieving longitudinal acceptance larger than 27 keV/u-ns for the stable operation and minimizing the emittance growth less than 30 % in the superconducting linac for high quality beam at the in-flight target.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME148
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THPRI062	CW Room Temperature Re-buncher for the PIP-II Linac Front End	3914
	I. Terechkine, M. Chen, I.V. Gonin, S. Kazakov, T.N. Khabiboulline, L. Ristori, G.V. Romanov Fermilab, Batavia, Illinois, USA
	At Fermilab there is a plan for improvements to the Fermilab accelerator complex aimed at providing a beam power capability of at least 1 MW on target. The essential element of the plan (the Proton Improvement Plan II – PIP-II) is a new 800 MeV superconducting linac. The PIP-II linac includes a room temperature front-end and high energy part based on five types of superconducting cavities used to cover the entire velocity range required for beam acceleration. The room temperature front end is composed of an ion source, low energy beam transport line (LEBT), radio frequency quadrupole (RFQ), and a medium energy beam transport line (MEBT). The paper reports RF design of the re-buncher for MEBT along with thermal analysis of the cavity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI062
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