IPAC2016 - List of Keywords (cryomodule)

Paper	Title	Other Keywords	Page
MOXAA01	International Linear Collider, Latest Status towards Realization	collider, linear-collider, superconducting-RF, electron	1
	S. Komamiya ICEPP, Tokyo, Japan
	This presentation describes the International Linear Collider (ILC), an e⁺ and e^- collider based on the superconducting linear accelerator with a center of mass energy of 500 GeV in the first stage, upgradeable to 1 TeV. According to the statement of the Science Council of Japan, MEXT (Ministry of Education, Science, and Sports) and the Japanese government have investigated the feasibility of the ILC project, not only from the scientific view, but also the political, economical, and sociological points of view. The latest status of the project will be presented.
	Slides MOXAA01 [12.564 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOXAA01
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MOPOY039	Progress on Superconducting Linac for the RAON Heavy Ion Accelerator	linac, cavity, ion, electron	935
	H.J. Kim, H.C. Jung, W.K. Kim IBS, Daejeon, Republic of Korea
	The RISP (Rare Isotope Science Project) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. It can deliver ions from proton to uranium. Proton and uranium ions are accelerated upto 600 MeV and 200 MeV/u respectively. The facility consists of three superconducting linacs of which superconducting cavities are independently phased. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the RISP linac design, the prototyping of superconducting cavity and cryomodule.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY039
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MOPOY053	The SARAF-LINAC Project Status	linac, rfq, status, diagnostics	971
	N. Pichoff, N. Bazin, L. Boudjaoui, P. Brédy, D. Chirpaz-Cerbat, R. Cubizolles, B. Dalena, G. Ferrand, B. Gastineau, P. Gastinel, P. Girardot, F. Gougnaud, P. Hardy, M. Jacquemet, F. Leseigneur, C. Madec, N. Misiara, P.A.P. Nghiem, D. Uriot CEA/IRFU, Gif-sur-Yvette, France P. Bertrand, M. Di Giacomo, R. Ferdinand, J.-M. Lagniel, J.F. Leyge, M. Michel GANIL, Caen, France
	SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the superconducting linac (SARAF-LINAC Project). This paper presents to the accelerator community the status at March 2016 of the SARAF-LINAC Project.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY053
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MOPOY057	The Linear IFMIF Prototype Accelerator (LIPAC) Design Development under the European-Japanese Collaboration	rfq, SRF, linac, vacuum	985
	P. Cara, R. Heidinger Fusion for Energy, Garching, Germany N. Bazin, S. Chel, R. Gobin, J. Marroncle, B. Renard CEA/DSM/IRFU, France B. Brañas Lasala, D. Jiménez-Rey, J. Mollá, P. Méndez, I. Podadera CIEMAT, Madrid, Spain A. Facco, E. Fagotti, A. Pisent INFN/LNL, Legnaro (PD), Italy A. Kasugai, S. Keishi, S. O'hira JAEA, Aomori, Japan J. Knaster, A. Marqueta, Y. Okumura IFMIF/EVEDA, Rokkasho, Japan K. Sakamoto QST, Aomori, Japan
	The IFMIF aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity. Part of the BA agreement (Japan-EURATOM), the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which includes a 125mA CW D⁺ accelerator up to 9 MeV mainly designed and manufactured in Europe. The components are in an advanced stage of manufacturing. The first components which allow the production of a 140 mA-100 keV deuteron beam have been delivered, installed and under commissioning at Rokkasho. The second phase (100 keV to 5 MeV) will end by March 2017. The third phase (short pulse) and forth phase (cw) will be the integrated commissioning of the LIPAc up to 9 MeV. The duration of the project has been recently extended up to end 2019 to allow the commissioning and operation of the whole accelerator (1MW). The aim of this paper is to give an overview of the LIPAc, currently under commissioning in Japan, to outline the engineering design and the development of the key components, as well as the expected outcomes of the engineering work, associated with the experimental program.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY057
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TUPMB046	The Preliminary Conceptual Design of a 2k Cryogneic System for Circular Electron Positron Collider (CEPC)	cryogenics, collider, booster, cavity	1199
	Y.P. Liu, L. Bian, R. Ge, R. Han, S.P. Li, M.J. Sang, L.R. Sun, M.F. Xu, R. Ye, J.Q. Zhang, J.H. Zhang, X.Z. Zhang, Z.Z. Zhang IHEP, Beijing, People's Republic of China
	The Circular Electron Positron Collider (CEPC) is a long-term collider project, which will serve as a Higgs Factory and offer a unique opportunity for direct searches for New Physics in the high-energy range far beyond LHC reach [1]. In the frame of this project, a large 2K cryogenic system will be built to provide coolant for superconducting cavities used in booster ring and collider ring. All the superconducting cavities will be working under 2K. This paper will give a brief introduction to the preliminary considerations of this large cryogenic system, including the general layout, heat load estimation, helium refrigerator, schematic flow diagram as well as the main parameters and working process
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB046
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TUPMY014	Muon Acceleration Concepts for Future Neutrino Factory	linac, acceleration, SRF, focusing	1574
	S.A. Bogacz JLab, Newport News, Virgina, USA
	Funding: Work supported by the Muon Accelerator Program Here, we summarize current state of concept for muon acceleration aimed at future Neutrino Factory. The main thrust of these studies was to reduce the overall cost while maintaining performance through exploring interplay between complexity of the cooling systems and the acceptance of the accelerator complex. To ensure adequate survival of the short-lived muons, acceleration must occur at high average gradient. The need for large transverse and longitudinal acceptances drives the design of the acceleration system to initially low RF frequency, e.g. 325 MHz, and then increased to 650 MHz, as the transverse size shrinks with increasing energy. High-gradient normal conducting RF cavities at these frequencies require extremely high peak-power RF sources. Hence superconducting RF (SRF) cavities are chosen. Here, we considered two cost effective schemes for accelerating muon beams for a stagable Neutrino Factory: Exploration of the so-called 'dual-use' linac concept, where the same linac structure is used for acceleration of both H⁻ and muons and alternatively, the SRF efficient design based on multi-pass (4.5) 'dogbone' RLA, extendable to multi-pass FFAG-like arcs.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY014
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WEOBA01	Beam Commissioning of the HIE-ISOLDE Post-Accelerator	diagnostics, linac, detector, rfq	2045
	J.A. Rodriguez, W. Andreazza, J.M. Bibby, N. Bidault, E. Bravin, J.C. Broere, E.D. Cantero, R. Catherall, V. Cobham, M. Elias, E. Fadakis, P. Fernier, M.A. Fraser, F. Gerigk, K. Hanke, Y. Kadi, M.L. Lozano Benito, E. Matli, S. Sadovich, E. Siesling, D. Valuch, W. Venturini Delsolaro, F.J.C. Wenander, P. Zhang CERN, Geneva, Switzerland
	Phase 1a of the High Intensity and Energy ISOLDE (HIE-ISOLDE) project* was completed in 2015. The first cryomodule and two High Energy Beam Transfer lines (HEBT) were installed. In addition, many of the subsystems of the normal conducting part of the post-accelerator (REX) were renovated or refurbished. Following the hardware commissioning of the different system** and, in preparation for the start of the physics program, many tests and measurements were conducted as part of the beam commissioning program. The results of these tests and the plan for the next beam commissioning campaign are discussed in this paper. * Y. Kadi et al., "The HIE-ISOLDE Project", Journal of Physics: Conference Series 312. ** W. Venturini et al., "HIE-ISOLDE First Commissioning Experience", IPAC'16
	Slides WEOBA01 [1.437 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOBA01
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WEIB03	Technology Transfer and Research Projects	SRF, TRIUMF, detector, linac	2109
	R.E. Laxdal TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	The funding scenario seems to improve based on the capability of a laboratory to generate technology that can be transferred to industry, in particular if the technology is of public interest. New research projects may benefit if the technology transfer is considered as an integral part of the project itself. The drawback could be that revenue generated by a successful technology transfer may give the impression that research projects only provide societal benefit by direct transfer through closed protocols. This paper provides an overview of different technology transfer projects worldwide and how different laboratories are dealing with the issue.
	Slides WEIB03 [28.369 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEIB03
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WEPMB003	Design of the HWR Cavities for SARAF	cavity, linac, pick-up, simulation	2119
	G. Ferrand, L. Boudjaoui, D. Chirpaz-Cerbat, P. Hardy, F. Leseigneur, C. Madec, N. Misiara, N. Pichoff CEA/IRFU, Gif-sur-Yvette, France
	CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40 MeV. The SCL consists in 4 cryomodules. The first two identical cryomodules host 6 half-wave resonator (HWR) low beta cavities (β = 0.09) at 176 MHz. The last two identical cryomodule will host 7 HWR high-beta cavities (β = 0.18) at 176 MHz. Low-beta and high beta cavities have been optimized to limit electric and magnetic peak fields in the cavity, and to minimize the dissipated power. Manufacturing constraints and helium cooling were taken into consideration to minimize the risk during manufacturing and operation. Preliminary mechanical studies of the cavity and of the tuning system, as well as preliminary studies of the couplers and pick-up antennas were carried out. This work will be presented in this poster.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB003
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WEPMB005	Manufacturing of the IFMIF Series Power Couplers	operation, vacuum, interface, cavity	2122
	H. Jenhani, N. Bazin, N. Berton, G. Devanz, P. Hardy, V.M. Hennion CEA/IRFU, Gif-sur-Yvette, France
	In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, a Linear IFMIF Prototype Accelerator (LIPAc) is presently under construction for the first phase of the project. Eight power couplers are needed for the cryomodule of LIPAc. After the validation of the two prototypes, the manufacturing of the Series Power Couplers was lunched. This paper will report the status of the manufacturing progress. It will also describe the acceptance tests in addition to the criteria adopted for these critical RF power units. The manufacturing imperfections and some finishing techniques used for the different parts will be also presented and discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB005
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WEPMB007	Error Estimation in Cavity Performance Test for the European XFEL at DESY	cavity, accelerating-gradient, HOM, operation	2128
	Y. Yamamoto KEK, Ibaraki, Japan W.-D. Möller, D. Reschke DESY, Hamburg, Germany
	The cavity performance tests, that is, vertical test (V.T.) and cryomodule test (C.T.), in the cavity/cryomodule mass production for XFEL have been done since 2012 at DESY, and is still on-going at present. At the comparatively initial stage of the mass production, the error estimation in the cavity performance tests was done for understanding how precisely those measurements are done at AMTF (Accelerator Module Test Facility). There are two parameters for the error estimation in V.T. One is the cable calibration parameter, and the other is the external Q-value, which is related to the power emitted from cavity. The measurement precision in the external Q-value depends on the measurement of coupling coefficient (β) strongly. Therefore, it is essential not to miss the β measurement for the precise measurement in V.T. On the other hand, as for C.T., the change of parameter (Kt), which is related to the evaluation of accelerating gradient, was used. As the result of the data analysis for Kt, the error was estimated to be 6%, and is related to the cavity performance degradation from V.T. to C.T. In this paper, the detailed data analysis and error estimation will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB007
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WEPMB009	Status of the Superconducting Cryomodules and Cryogenic System for the Mainz Energy-recovering Superconducting Accelerator MESA	HOM, niobium, electron, operation	2134
	T. Stengler, K. Aulenbacher, F. Hug, D. Simon, P. Weber IKP, Mainz, Germany F. Schlander ESS, Lund, Sweden N. Wiehl Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany
	Funding: Work supported by the German Research Foundation (DFG) under the Cluster of Excellence "PRISMA" SRF and the cryogenic system are mandatory for the operation of MESA at the Institut für Kernphysik at Johannes Gutenberg-Universität Mainz. The cryomodule production project is running for one year right now and the recent developments and measurements are presented. Further on the cryogenic concept required for the operation of MESA will be discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB009
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WEPMB011	ESS Medium and High Beta Cavity Prototypes	cavity, HOM, coupling, interface	2138
	P. Michelato, A. Bellandi, M. Bertucci, A. Bignami, A. Bosotti, J.F. Chen, L. Monaco, R. Paparella, P. Pierini, D. Sertore INFN/LASA, Segrate (MI), Italy C.G. Maiano DESY, Hamburg, Germany C. Pagani Università degli Studi di Milano & INFN, Segrate, Italy S. Pirani ESS, Lund, Sweden
	In the framework of the ESS activity in progress at INFN-LASA, we are designing and developing 704.42 MHz Medium (β=0.67) and High (β=0.86) beta prototype cavities plug compatible with the ESS cryomodule design. The cells of one Medium and one High beta cavity are fabricated with high quality CBMM Large Grain Niobium (480 mm dia. Ingot, RRR=300, sliced by Heraeus) while a Medium beta cavity is done with Fine Grain material for comparison. The prototype cavities will be produced by the firm Ettore Zanon S.p.A. under the supervision of INFN - LASA group.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB011
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WEPMB013	Long Term Cavity Performance in Compact-ERL Injector Cryomodule	cavity, operation, radiation, electron	2145
	E. Kako, T. Konomi, T. Miura, H. Sakai, K. Umemori KEK, Ibaraki, Japan
	Degradation of cavity performance due to heavy field emission was observed in three 2-cell cavities after beam operation at 5 MeV for 2 years.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB013
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WEPMB015	Construction and 2K Cooling Test of Horizontal Test Cryostat at KEK	SRF, cavity, operation, HOM	2151
	K. Umemori, K. Hara, E. Kako, Y. Kobayashi, Y. Kondo, H. Nakai, H. Sakai, S. Yamaguchi KEK, Ibaraki, Japan
	A horizontal test cryostat was designed and constructed at AR East building on KEK. Main purposes of test stand are improvement of module assembly technique and effective development of module components. Diameter of vacuum chamber is 1 m and its length is 3 m, which is enough to realize performance test of L-band 9-cell cavity with full assembly, including input couplers, HOM dampers/couplers and frequency tuners. On the sides, several ports are prepared to access to components, such as coupler and tuners. A cold box is placed on the top of the chamber. Liquid He is filled in a 4K-pod and 2K He is supplied through a J-T valve. A He pumping system is prepared. Inside of the chamber was covered with 80K shield, which is cooled by Liquid nitrogen. A cavity is supported on 5K table, which is also used as 5K thermal anchors. After cooling down to 80K using liquid Nitrogen, 4K He was stored and pumped down to 2K. The cooling test was successful. In this presentation, details of design and construction of the horizontal test cryostat is described and results of the cooling tests are shown. High power tests will be realized in near future.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB015
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WEPMB017	High Gradient Cavity Performance in STF-2 Cryomodule for the ILC at KEK	cavity, radiation, HOM, accelerating-gradient	2158
	Y. Yamamoto, T. Honma, E. Kako, Y. Kojima, T. Matsumoto, H. Nakai, T. Shishido KEK, Ibaraki, Japan
	The high power test for STF-2 cryomodule has completed successfully in 2015. Before cooldown of cryomodule, at first, the input coupler conditioning at room temperature is done with detuned cavities. After cooldown, the cavity conditioning, which is the main part in the performance test, is done by monitoring the radiation level measured at three locations around the cryomodule, and the heating and RF output at two HOM (Higher Order Mode) couplers. Consequently, it became clear the average accelerating gradient is 30 MV/m for STF-2 cryomodule (39 MV/m at max. and 15 MV/m at min.), and the second cavity string with four cavities had the significant performance degradation by heavy field emission due to the additional clean room work in the STF tunnel. As the following next steps, there are the LFD (Lorenz Force Detuning) measurement, LFD compensation by piezo, and long run for check of stable operation at high gradient. In the long run around 32 MV/m, each cavity without degradation showed the stable operation with the successful LFD compensation by piezo and RF feedback system. In this paper, the detailed test result will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB017
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WEPMB039	Operation Techniques for HWR1 Cryomodule	PLC, EPICS, controls, radiation	2205
	H. Kim, J.W. Choi, Y.W. Jo, W.K. Kim, Y. Kim, M. Lee IBS, Daejeon, Republic of Korea
	Control systems such as PLC and EPICS are developed for a half-wave resonator (HWR) cryomodule. PLC rack is fabricated for the HWR1 cryomodule. The PLC controls pumps, heaters and valves. The PLC communicates with temperature monitors through Ethernet. HMI of PLC and EPICS controls and monitors pumps, heaters, valves and temperature sensors through switching hub. The PLC HMI is developed and EPICS is also developed. The CSS of EPICS consists of control, monitor, parameter set-up, alarm and data browser screen.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB039
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WEPMB051	HIE-ISOLDE: First Commissioning Experience	solenoid, operation, controls, cavity	2230
	W. Venturini Delsolaro, E. Bravin, N. Delruelle, M. Elias, J.A. Ferreira Somoza, M.A. Fraser, J. Gayde, Y. Kadi, G. Kautzmann, F. Klumb, Y. Leclercq, M. Martino, V. Parma, J.A. Rodriguez, S. Sadovich, E. Siesling, D. Smekens, L. Valdarno, D. Valuch, P. Zhang CERN, Geneva, Switzerland
	The HIE ISOLDE project [1] reached a major milestone in October 2015, with the start of the first physics run with radioactive ion beams. This achievement was the culminating point of intense months during which the first cryomodule of the HIE ISOLDE superconducting Linac and its high-energy beam transfer lines were first installed and subsequently brought into operation. Hardware commissioning campaigns were conducted in order to define the envelope of parameters within which the machine could be operated, to test and validate software and controls, and to investigate the limitations preventing the systems to reach their design performance. Methods and main results of the first commissioning of HIE ISOLDE post accelerator, including the performance of the superconducting cavities with beam, will be reviewed in this contribution.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB051
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WEPMR004	Cryomdoule Test Stand Reduced-Magnetic Support Design at Fermilab	cavity, SRF, vacuum, linac	2262
	M.W. McGee, S.K. Chandrasekaran, A.C. Crawford, E.R. Harms, J.R. Leibfritz, G. Wu Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy In a partnership with SLAC National Accelerator Laboratory (SLAC) and Jefferson Lab, Fermilab will assemble and test 17 of the 35 total 1.3 GHz cryomodules for the Linac Coherent Light Source II (LCLS-II) Project. These devices will be tested at Fermilab's Cryomodule Test Facility (CMTF) within the Cryomodule Test Stand (CMTS-1) cave. The problem of magnetic pollution became one of major issues during design stage of the LCLS-II cryomodule as the average quality factor of the accelerating cavities is specified to be 2.7 x 10¹⁰. One of the possible ways to mitigate the effect of stray magnetic fields and to keep it below the goal of 5 mGauss involves the application of low permeable materials. Initial permeability and magnetic measurement studies regarding the use of 316L stainless steel material indicated that cold work (machining) and heat affected zones from welding would be acceptable.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR004
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WEPMR005	Investigation of Thermal Acoustic Effects on SRF Cavities within CM1 at Fermilab	cavity, operation, cryogenics, acceleration	2265
	M.W. McGee, E.R. Harms, A.L. Klebaner, J.R. Leibfritz, A. Martinez, Y.M. Pischalnikov, W. Schappert Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy. Two TESLA-style 8-cavity cryomodules have been operated at Fermilab Accelerator Science and Technology (FAST), formerly the Superconducting Radio Frequency (SRF) Accelerator Test Facility. Operational instabilities were revealed during Radio Frequency (RF) power studies. These observations were complemented by the characterization of thermal acoustic effects on cavity microphonics manifested by apparent noisy boiling of helium involving vapor bubble and liquid vibration. The thermal acoustic measurements also consider pressure and temperature spikes which drive the phenomenon at low and high frequencies.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR005
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WEPMR006	Transport of LCLS-II 1.3 GHz Cryomodule to SLAC	vacuum, acceleration, alignment, cavity	2268
	M.W. McGee, T.T. Arkan, T.J. Peterson, Z. Tang Fermilab, Batavia, Illinois, USA S.R. Boo, M. Carrasco SLAC, Menlo Park, California, USA E. Daly, N.A. Huque JLab, Newport News, Virginia, USA
	Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy. In a partnership with SLAC National Accelerator Laboratory (SLAC) and Jefferson Lab, Fermilab will assemble and test 17 of the 35 total 1.3 GHz cryomodules for the Linac Coherent Light Source II (LCLS-II) Project. These include a prototype built and delivered by each Lab. Another two 3.9 GHz cryomodules will be built, tested and transported by Fermilab to SLAC. Each assembly will be transported over-the-road from Fermilab or Jefferson Lab using specific routes to SLAC. The transport system consists of a base frame, isolation fixture and upper protective truss. The strongback cryomodule lifting fixture is described along with other supporting equipment used for both over-the-road transport and local (on-site) transport at Fermilab. Initially, analysis of fragile components and stability studies will be performed in order to assess the risk associated with over-the-road transport of a fully assembled cryomodule.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR006
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WEPMR009	Magnetic Flux Expulsion Studies in Niobium SRF Cavities	cavity, niobium, background, survey	2277
	S. Posen, M. Checchin, A.C. Crawford, A. Grassellino, M. Martinello, O.S. Melnychuk, A. Romanenko, D.A. Sergatskov, Y. Trenikhina Fermilab, Batavia, Illinois, USA
	With the recent discovery of nitrogen doping treatment for SRF cavities, ultra-high quality factors at medium accelerating fields are regularly achieved in vertical RF tests. To preserve these quality factors into the cryomodule, it is important to consider background magnetic fields, which can become trapped in the surface of the cavity during cooldown and cause Q₀ degradation. Building on the recent discovery that spatial thermal gradients during cooldown can significantly improve expulsion of magnetic flux, a detailed study was performed of flux expulsion on two cavities with different furnace treatments that are cooled in magnetic fields amplitudes representative of what is expected in a realistic cryomodule. In this contribution, we summarize these cavity results, in order to improve understanding of the impact of flux expulsion on cavity performance.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR009
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WEPMR011	Simulations and Experimental Studies of Third Harmonic 3.9 Ghz CW Couplers for LCLS-II Project	cavity, operation, simulation, linac	2280
	N. Solyak, I.V. Gonin, E.R. Harms, S. Kazakov, T.N. Khabiboulline, A. Lunin Fermilab, Batavia, Illinois, USA
	LCLS-II linac is based on SRF technology developed for the XFEL project. The XFEL 3rd harmonic system built by INFN is based on the original designs of cavity and power coupler developed and built by Fermilab for the FLASH facility at DESY. For LCLS-II application both designs of the 3.9 GHz cavity and the power coupler have been modified for an operation in the continuous wave regime up to 2 kW average RF power. In this paper we discuss coupler modifications and the result multiphysics analysis for various operating regimes. For the initial test of a proposed design, we decided to modify two spare warm sections of power couplers, built for the FLASH facility, by shortening both of two inner bellows and making a thicker copper plating. Modification of the existing coupler test stand and the test program are briefly discussed in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR011
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WEPMR012	Misalignment Studies of LCLS-II SC Linac	linac, emittance, network, alignment	2283
	A. Saini, N. Solyak, V.P. Yakovlev Fermilab, Batavia, Illinois, USA T.O. Raubenheimer SLAC, Menlo Park, California, USA
	The Linac Coherent Light Source (LCLS) is an x-ray free electron laser facility. The proposed upgrade of the LCLS facility is based on construction of a 4 GeV superconducting (SC) linear accelerator (linac). An optimal reliable performance of the linac is largely determined by beam sensitivity to various component alignment errors. In this paper we evaluate misalignment tolerances of LCLSII SC linac using a more realistic alignment model that includes correlated misalignment of elements.
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WEPMR018	Time Resolved Cryogenic Cooling Analysis of the Cornell Injector Cryomodule	HOM, cryogenics, simulation, operation	2298
	R.G. Eichhorn, A.C. Bartnik, B.M. Dunham, G.M. Ge, G.H. Hoffstaetter, H. Lee, M. Liepe, S.R. Markham, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	To demonstrate key parameters of a an energy recovery linac (ERL) at Cornel, an injector based on a photo gun and an SRF cryomodule was designed and built. The goal was to demonstrate high current generation while achieving low emittances. While the emittance goal has been reached, the current achieved so far is 75 mA. Even though this is a world record, it is still below the targeted 100 mA. While ramping up the current we observed excessive heating in the fundamental power coupler which we were able to track down to insufficient cooling of the 80 K intercepts. These intercepts are cooled by a stream of parallel cryogenic flows which we found to be unbalanced. In this paper we will review the finding, describe the analysis we did, modeling of the parallel flow and the modifications made to the module to overcome the heating.
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WEPMR020	First Cool-down of the Cornell ERL Main Linac Cryo-Module	cavity, linac, HOM, vacuum	2305
	R.G. Eichhorn, J.V. Conway, F. Furuta, G.M. Ge, D. Gonnella, T. Gruber, G.H. Hoffstaetter, J.J. Kaufman, M. Liepe, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Cornell University has finished building a 10 m long superconducting accelerator module as a prototype of the main linac of a proposed ERL facility. This module houses 6 superconducting cavities- operated at 1.8 K in continuous wave (CW) mode with a design field of 16 MV/m and a Quality factor of 2x10¹⁰. We wil shortly review the design and focus on reporting on the first cool-down of this module. We will giving data for various cool-down scenarios (fast/ slow), uniformity and performance
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WEPMR021	HOM Measurements for Cornell's High-current CW ERL Cryomodule	HOM, cavity, simulation, linac	2309
	F. Furuta, R.G. Eichhorn, G.M. Ge, D. Gonnella, G.H. Hoffstaetter, M. Liepe, P. Quigley, V. Veshcherevich Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	The main linac cryomodule (MLC) for the future energy-recovery linac (ERL) based synchrotron-light facility at Cornell had been designed, fabricated, and tested. It houses 6 SRF cavities with individual higher order-modes (HOMs)absorbers and one magnet/ BPM section. We will report the HOM study on MLC.
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WEPMR022	ERL Main Linac Cryomodule Cavity Performance and Effect of Thermal Cycling	cavity, linac, SRF, target	2312
	F. Furuta, J. Dobbins, R.G. Eichhorn, G.M. Ge, D. Gonnella, G.H. Hoffstaetter, M. Liepe, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Cornell has designed, fabricated, and tested a high current (100 mA) CW SRF prototype cryomodule for the future energy-recovery linac (ERL) based synchrotron-light facility at Cornell . It houses six 7-cell SRF cavities with individual HOM absorbers and one magnet/ BPM section. Cavities are targeted to operate with high Qo of 2.0·10¹⁰ at 16.2 MV/m, 1.8 K in continuous wave (CW) mode. We will report the RF test results of 7-cell cavities in this cryomodule after initial cooldown and several thermal cycles with different cooldown method.
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WEPOR031	Field Emission Radiation Characterization of LCLS-II Cavities	cavity, radiation, detector, linac	2736
	M. Santana-Leitner, C. Adolphsen, L. Ge, Z. Li, T.O. Raubenheimer, M.C. Ross SLAC, Menlo Park, California, USA S. Aderhold, A. Grassellino, O.S. Melnychuk, R.V. Pilipenko, D.A. Sergatskov Fermilab, Batavia, Illinois, USA
	Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515 LCLS-II XFEL facility at the SLAC National Accelerator Laboratory will accelerate CW beams of up to 300 uA to 4 GeV using superconducting radio frequency cavities. Before installation, fully assembled cryomodules will be tested at Fermilab and Jefferson Lab. Besides the basic measurements of cavity gradients and cryogenic heat loads, radiation and dark current levels will be recorded. The latter parameters need to be limited to ensure the safety of the machine and the lifetime of radio-sensitive components installed near the cavities. In this paper we describe the simulation studies being done in preparation of tests, where expected radiation measurements in the different detectors are correlated with field emission and with dark currents in Faraday cups at each end of the cryomodule. This work includes simulations using a detailed model of the cryomodules and detectors, where field emission data generated with Track3P is parsed to the FLUKA radiation transport code.
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WEPOR035	MicroTCA.4-Based LLRF System for Spoke Cavities of C-ADS Injector I	LLRF, cavity, operation, controls	2749
	X. Ma, N. Gan, X. Huang, N. Liu, R.L. Liu, G.W. Wang, Q.Y. Wang IHEP, Beijing, People's Republic of China H.Y. Lin Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
	The C-ADS Injector I is being built in IHEP, which includes 14 β=0.12 superconducting single spoke cavities enclosed with two cryomodules under 2 K. The MicroTCA.4-based Low Level RF (LLRF) system provides GDR mode for the operation of the cavities. The LLRF system supports both CW and duty-adjustable pulsed operation modes for the high power source and the cavities. The firmware of the FPGA controller and the EPICS IOC software has been upgraded during the last half year adding feedforward and abnormal detection. The operator interface (OPI) software and automatic operation script are also described. The MicroTCA.4 platform runs well for the beam commissioning of the Injector I. Some gained experiences with stable beam operation are also shown.
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WEPOR043	End-to-end FEL Beam Stability Simulation Engine	cavity, simulation, linac, software	2768
	C. Serrano, L.R. Doolittle LBNL, Berkeley, California, USA D.S. Driver, B. Patel, A.F. Queiruga, Z. Zaky UCB, Berkeley, USA Q. Llimona UPF, Barcelona, Spain
	Funding: Work supported by U.S. Department of Energy During the design, commissioning and operation of a linac-driven Free Electron Laser (FEL) it is important to have a good understanding of the implications of accelerator design choices on beam figures of merit. This simulation engine combines a full state-space model of the RF system (High-Power Amplifier, RF cavities, LLRF controllers, etc.), a characterization of beam properties such as energy, bunch length and arrival time as electrons propagate through the Linac and beam-based feedback. The combination of these models with the ability to introduce both correlated and uncorrelated noise sources at any point of the machine, allows for a complete transposition of noise sources to beam performance parameters, including frequency dependence, in order to analyze implications of accelerator design choices in a simulation environment.
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THYB01	Performance of Superconducting Cavities for the European XFEL	cavity, operation, SRF, vacuum	3186
	D. Reschke DESY, Hamburg, Germany
	The superconducting accelerator of the European XFEL consists of the injector part and the main linac. The injector includes one 1.3 GHz accelerator module and one 3.9 GHz third harmonic module, while the main linac consists of 100 accelerator modules, each housing eight 1.3 GHz TESLA-type cavities, operated at an average design gradient of 23.6 MV/m. The fabrication and surface treatment by industry as well as the vertical and cryomodule RF tests of the required 808 superconducting 1.3GHz cavities are analysed and presented.
	Slides THYB01 [3.227 MB]
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THOBB03	Root Causes of Field Emitters in SRF Cavities Placed in CEBAF Tunnel	cavity, SRF, vacuum, operation	3198
	R.L. Geng JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. It has been suspected that appearance of new field emitters can occur in SRF cavities after their placement in accelerator tunnel for long term beam operation. This apparently has been the case for CEBAF. However, no physical evidence has been shown in the past. In this contribution, we will report on the recent results concerning the root cause of field emitters in SRF cavities placed in CEBAF tunnel. We will discuss these results in the context of high-reliability and low-cryogenic-loss operation of CEBAF.
	Slides THOBB03 [3.768 MB]
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THPMR003	Failure Modes and Beam Losses Studies in ILC Bunch Compressors and Main Linac	beam-losses, quadrupole, linac, cavity	3388
	A. Saini, N. Solyak, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	Proposed International linear collider (ILC) involves high average beam power. Dealing with high average beam power and smaller beam sizes result in stringent tolerances on beam losses and therefore, extensive studies are required to investigate every possible scenarios that lead to beam losses. In this paper we discuss beam losses due to failure of critical elements in beamline for ILC bunch compressors and main linac.
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THPMY003	Design of the RISP Vacuum Systems	vacuum, ion, linac, simulation	3657
	D. Jeon, J.H. Cho, K.B. Lim, H.J. Son, J. Song, S.W. Yoon IBS, Daejeon, Republic of Korea H.S. Choi, T. Ha PAL, Pohang, Republic of Korea S.R. In KAERI, Daejon, Republic of Korea B.C. Kim, K.P. Kim, K.M. Kim, Y.S. Kim NFRI, Republic of Korea
	The vacuum requirement of the RISP heavy ion accel-erator facility has been derived that meets the beam loss requirement and the vacuum system design is carried out using the 3D Molflow+ code verifying the vacuum re-quirement. We used realistic outgassing values of the materials of the vacuum chambers and beam pipes. We are designing detailed vacuum system specification and configuration including pumps, gate valves, and vacuum gauges along with the interlock system and differential pumping stations.
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FRYAA02	ESS Progressing into Construction	linac, neutron, target, beam-transport	4266
	M. Lindroos, H. Danared, M. Eshraqi, R. Garoby, A. Jansson, Y.I. Levinsen, C.A. Martins, A. Ponton ESS, Lund, Sweden
	The construction of the European Spallation Source, ESS, started in summer 2014. At the site in Lund, the accelerator tunnel will be completed at the time of IPAC16, while prototyping and manufacturing or prepara-tions for manpower contributions are going on in more 23 laboratories distributed over the 12 European countries collaborating on the accelerator project. Major technical milestones have been reached include the testing of su-perconducting cavity prototypes of two families to values above design gradients, the first ESS modulator has been tested to 90 kV and the first klystron prototype has been received in April 2016. Equally important developments are taking place at many partner laboratories. The presen-tation will summarize the status of the ESS accelerator project by the time of IPAC16..
	Slides FRYAA02 [66.734 MB]
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Paper

Title

Other Keywords

Page

MOXAA01

International Linear Collider, Latest Status towards Realization

collider, linear-collider, superconducting-RF, electron

1

S. Komamiya
ICEPP, Tokyo, Japan

This presentation describes the International Linear Collider (ILC), an e⁺ and e^- collider based on the superconducting linear accelerator with a center of mass energy of 500 GeV in the first stage, upgradeable to 1 TeV. According to the statement of the Science Council of Japan, MEXT (Ministry of Education, Science, and Sports) and the Japanese government have investigated the feasibility of the ILC project, not only from the scientific view, but also the political, economical, and sociological points of view. The latest status of the project will be presented.

Slides MOXAA01 [12.564 MB]

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MOPOY039

Progress on Superconducting Linac for the RAON Heavy Ion Accelerator

linac, cavity, ion, electron

935

H.J. Kim, H.C. Jung, W.K. Kim
IBS, Daejeon, Republic of Korea

The RISP (Rare Isotope Science Project) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. It can deliver ions from proton to uranium. Proton and uranium ions are accelerated upto 600 MeV and 200 MeV/u respectively. The facility consists of three superconducting linacs of which superconducting cavities are independently phased. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the RISP linac design, the prototyping of superconducting cavity and cryomodule.

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MOPOY053

The SARAF-LINAC Project Status

linac, rfq, status, diagnostics

971

N. Pichoff, N. Bazin, L. Boudjaoui, P. Brédy, D. Chirpaz-Cerbat, R. Cubizolles, B. Dalena, G. Ferrand, B. Gastineau, P. Gastinel, P. Girardot, F. Gougnaud, P. Hardy, M. Jacquemet, F. Leseigneur, C. Madec, N. Misiara, P.A.P. Nghiem, D. Uriot
CEA/IRFU, Gif-sur-Yvette, France
P. Bertrand, M. Di Giacomo, R. Ferdinand, J.-M. Lagniel, J.F. Leyge, M. Michel
GANIL, Caen, France

SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the superconducting linac (SARAF-LINAC Project). This paper presents to the accelerator community the status at March 2016 of the SARAF-LINAC Project.

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MOPOY057

The Linear IFMIF Prototype Accelerator (LIPAC) Design Development under the European-Japanese Collaboration

rfq, SRF, linac, vacuum

985

P. Cara, R. Heidinger
Fusion for Energy, Garching, Germany
N. Bazin, S. Chel, R. Gobin, J. Marroncle, B. Renard
CEA/DSM/IRFU, France
B. Brañas Lasala, D. Jiménez-Rey, J. Mollá, P. Méndez, I. Podadera
CIEMAT, Madrid, Spain
A. Facco, E. Fagotti, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A. Kasugai, S. Keishi, S. O'hira
JAEA, Aomori, Japan
J. Knaster, A. Marqueta, Y. Okumura
IFMIF/EVEDA, Rokkasho, Japan
K. Sakamoto
QST, Aomori, Japan

The IFMIF aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity. Part of the BA agreement (Japan-EURATOM), the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which includes a 125mA CW D⁺ accelerator up to 9 MeV mainly designed and manufactured in Europe. The components are in an advanced stage of manufacturing. The first components which allow the production of a 140 mA-100 keV deuteron beam have been delivered, installed and under commissioning at Rokkasho. The second phase (100 keV to 5 MeV) will end by March 2017. The third phase (short pulse) and forth phase (cw) will be the integrated commissioning of the LIPAc up to 9 MeV. The duration of the project has been recently extended up to end 2019 to allow the commissioning and operation of the whole accelerator (1MW). The aim of this paper is to give an overview of the LIPAc, currently under commissioning in Japan, to outline the engineering design and the development of the key components, as well as the expected outcomes of the engineering work, associated with the experimental program.

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TUPMB046

The Preliminary Conceptual Design of a 2k Cryogneic System for Circular Electron Positron Collider (CEPC)

cryogenics, collider, booster, cavity

1199

Y.P. Liu, L. Bian, R. Ge, R. Han, S.P. Li, M.J. Sang, L.R. Sun, M.F. Xu, R. Ye, J.Q. Zhang, J.H. Zhang, X.Z. Zhang, Z.Z. Zhang
IHEP, Beijing, People's Republic of China

The Circular Electron Positron Collider (CEPC) is a long-term collider project, which will serve as a Higgs Factory and offer a unique opportunity for direct searches for New Physics in the high-energy range far beyond LHC reach [1]. In the frame of this project, a large 2K cryogenic system will be built to provide coolant for superconducting cavities used in booster ring and collider ring. All the superconducting cavities will be working under 2K. This paper will give a brief introduction to the preliminary considerations of this large cryogenic system, including the general layout, heat load estimation, helium refrigerator, schematic flow diagram as well as the main parameters and working process

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TUPMY014

Muon Acceleration Concepts for Future Neutrino Factory

linac, acceleration, SRF, focusing

1574

S.A. Bogacz
JLab, Newport News, Virgina, USA

Funding: Work supported by the Muon Accelerator Program
Here, we summarize current state of concept for muon acceleration aimed at future Neutrino Factory. The main thrust of these studies was to reduce the overall cost while maintaining performance through exploring interplay between complexity of the cooling systems and the acceptance of the accelerator complex. To ensure adequate survival of the short-lived muons, acceleration must occur at high average gradient. The need for large transverse and longitudinal acceptances drives the design of the acceleration system to initially low RF frequency, e.g. 325 MHz, and then increased to 650 MHz, as the transverse size shrinks with increasing energy. High-gradient normal conducting RF cavities at these frequencies require extremely high peak-power RF sources. Hence superconducting RF (SRF) cavities are chosen. Here, we considered two cost effective schemes for accelerating muon beams for a stagable Neutrino Factory: Exploration of the so-called 'dual-use' linac concept, where the same linac structure is used for acceleration of both H⁻ and muons and alternatively, the SRF efficient design based on multi-pass (4.5) 'dogbone' RLA, extendable to multi-pass FFAG-like arcs.

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WEOBA01

Beam Commissioning of the HIE-ISOLDE Post-Accelerator

diagnostics, linac, detector, rfq

2045

J.A. Rodriguez, W. Andreazza, J.M. Bibby, N. Bidault, E. Bravin, J.C. Broere, E.D. Cantero, R. Catherall, V. Cobham, M. Elias, E. Fadakis, P. Fernier, M.A. Fraser, F. Gerigk, K. Hanke, Y. Kadi, M.L. Lozano Benito, E. Matli, S. Sadovich, E. Siesling, D. Valuch, W. Venturini Delsolaro, F.J.C. Wenander, P. Zhang
CERN, Geneva, Switzerland

Phase 1a of the High Intensity and Energy ISOLDE (HIE-ISOLDE) project* was completed in 2015. The first cryomodule and two High Energy Beam Transfer lines (HEBT) were installed. In addition, many of the subsystems of the normal conducting part of the post-accelerator (REX) were renovated or refurbished. Following the hardware commissioning of the different system** and, in preparation for the start of the physics program, many tests and measurements were conducted as part of the beam commissioning program. The results of these tests and the plan for the next beam commissioning campaign are discussed in this paper.
* Y. Kadi et al., "The HIE-ISOLDE Project", Journal of Physics: Conference Series 312.
** W. Venturini et al., "HIE-ISOLDE First Commissioning Experience", IPAC'16

Slides WEOBA01 [1.437 MB]

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WEIB03

Technology Transfer and Research Projects

SRF, TRIUMF, detector, linac

2109

R.E. Laxdal
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

The funding scenario seems to improve based on the capability of a laboratory to generate technology that can be transferred to industry, in particular if the technology is of public interest. New research projects may benefit if the technology transfer is considered as an integral part of the project itself. The drawback could be that revenue generated by a successful technology transfer may give the impression that research projects only provide societal benefit by direct transfer through closed protocols. This paper provides an overview of different technology transfer projects worldwide and how different laboratories are dealing with the issue.

Slides WEIB03 [28.369 MB]

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WEPMB003

Design of the HWR Cavities for SARAF

cavity, linac, pick-up, simulation

2119

G. Ferrand, L. Boudjaoui, D. Chirpaz-Cerbat, P. Hardy, F. Leseigneur, C. Madec, N. Misiara, N. Pichoff
CEA/IRFU, Gif-sur-Yvette, France

CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40 MeV. The SCL consists in 4 cryomodules. The first two identical cryomodules host 6 half-wave resonator (HWR) low beta cavities (β = 0.09) at 176 MHz. The last two identical cryomodule will host 7 HWR high-beta cavities (β = 0.18) at 176 MHz. Low-beta and high beta cavities have been optimized to limit electric and magnetic peak fields in the cavity, and to minimize the dissipated power. Manufacturing constraints and helium cooling were taken into consideration to minimize the risk during manufacturing and operation. Preliminary mechanical studies of the cavity and of the tuning system, as well as preliminary studies of the couplers and pick-up antennas were carried out. This work will be presented in this poster.

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WEPMB005

Manufacturing of the IFMIF Series Power Couplers

operation, vacuum, interface, cavity

2122

H. Jenhani, N. Bazin, N. Berton, G. Devanz, P. Hardy, V.M. Hennion
CEA/IRFU, Gif-sur-Yvette, France

In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, a Linear IFMIF Prototype Accelerator (LIPAc) is presently under construction for the first phase of the project. Eight power couplers are needed for the cryomodule of LIPAc. After the validation of the two prototypes, the manufacturing of the Series Power Couplers was lunched. This paper will report the status of the manufacturing progress. It will also describe the acceptance tests in addition to the criteria adopted for these critical RF power units. The manufacturing imperfections and some finishing techniques used for the different parts will be also presented and discussed.

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WEPMB007

Error Estimation in Cavity Performance Test for the European XFEL at DESY

cavity, accelerating-gradient, HOM, operation

2128

Y. Yamamoto
KEK, Ibaraki, Japan
W.-D. Möller, D. Reschke
DESY, Hamburg, Germany

The cavity performance tests, that is, vertical test (V.T.) and cryomodule test (C.T.), in the cavity/cryomodule mass production for XFEL have been done since 2012 at DESY, and is still on-going at present. At the comparatively initial stage of the mass production, the error estimation in the cavity performance tests was done for understanding how precisely those measurements are done at AMTF (Accelerator Module Test Facility). There are two parameters for the error estimation in V.T. One is the cable calibration parameter, and the other is the external Q-value, which is related to the power emitted from cavity. The measurement precision in the external Q-value depends on the measurement of coupling coefficient (β) strongly. Therefore, it is essential not to miss the β measurement for the precise measurement in V.T. On the other hand, as for C.T., the change of parameter (Kt), which is related to the evaluation of accelerating gradient, was used. As the result of the data analysis for Kt, the error was estimated to be 6%, and is related to the cavity performance degradation from V.T. to C.T. In this paper, the detailed data analysis and error estimation will be presented.

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WEPMB009

Status of the Superconducting Cryomodules and Cryogenic System for the Mainz Energy-recovering Superconducting Accelerator MESA

HOM, niobium, electron, operation

2134

T. Stengler, K. Aulenbacher, F. Hug, D. Simon, P. Weber
IKP, Mainz, Germany
F. Schlander
ESS, Lund, Sweden
N. Wiehl
Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany

Funding: Work supported by the German Research Foundation (DFG) under the Cluster of Excellence "PRISMA"
SRF and the cryogenic system are mandatory for the operation of MESA at the Institut für Kernphysik at Johannes Gutenberg-Universität Mainz. The cryomodule production project is running for one year right now and the recent developments and measurements are presented. Further on the cryogenic concept required for the operation of MESA will be discussed.

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WEPMB011

ESS Medium and High Beta Cavity Prototypes

cavity, HOM, coupling, interface

2138

P. Michelato, A. Bellandi, M. Bertucci, A. Bignami, A. Bosotti, J.F. Chen, L. Monaco, R. Paparella, P. Pierini, D. Sertore
INFN/LASA, Segrate (MI), Italy
C.G. Maiano
DESY, Hamburg, Germany
C. Pagani
Università degli Studi di Milano & INFN, Segrate, Italy
S. Pirani
ESS, Lund, Sweden

In the framework of the ESS activity in progress at INFN-LASA, we are designing and developing 704.42 MHz Medium (β=0.67) and High (β=0.86) beta prototype cavities plug compatible with the ESS cryomodule design. The cells of one Medium and one High beta cavity are fabricated with high quality CBMM Large Grain Niobium (480 mm dia. Ingot, RRR=300, sliced by Heraeus) while a Medium beta cavity is done with Fine Grain material for comparison. The prototype cavities will be produced by the firm Ettore Zanon S.p.A. under the supervision of INFN - LASA group.

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WEPMB013

Long Term Cavity Performance in Compact-ERL Injector Cryomodule

cavity, operation, radiation, electron

2145

E. Kako, T. Konomi, T. Miura, H. Sakai, K. Umemori
KEK, Ibaraki, Japan

Degradation of cavity performance due to heavy field emission was observed in three 2-cell cavities after beam operation at 5 MeV for 2 years.

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WEPMB015

Construction and 2K Cooling Test of Horizontal Test Cryostat at KEK

SRF, cavity, operation, HOM

2151

K. Umemori, K. Hara, E. Kako, Y. Kobayashi, Y. Kondo, H. Nakai, H. Sakai, S. Yamaguchi
KEK, Ibaraki, Japan

A horizontal test cryostat was designed and constructed at AR East building on KEK. Main purposes of test stand are improvement of module assembly technique and effective development of module components. Diameter of vacuum chamber is 1 m and its length is 3 m, which is enough to realize performance test of L-band 9-cell cavity with full assembly, including input couplers, HOM dampers/couplers and frequency tuners. On the sides, several ports are prepared to access to components, such as coupler and tuners. A cold box is placed on the top of the chamber. Liquid He is filled in a 4K-pod and 2K He is supplied through a J-T valve. A He pumping system is prepared. Inside of the chamber was covered with 80K shield, which is cooled by Liquid nitrogen. A cavity is supported on 5K table, which is also used as 5K thermal anchors. After cooling down to 80K using liquid Nitrogen, 4K He was stored and pumped down to 2K. The cooling test was successful. In this presentation, details of design and construction of the horizontal test cryostat is described and results of the cooling tests are shown. High power tests will be realized in near future.

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WEPMB017

High Gradient Cavity Performance in STF-2 Cryomodule for the ILC at KEK

cavity, radiation, HOM, accelerating-gradient

2158

Y. Yamamoto, T. Honma, E. Kako, Y. Kojima, T. Matsumoto, H. Nakai, T. Shishido
KEK, Ibaraki, Japan

The high power test for STF-2 cryomodule has completed successfully in 2015. Before cooldown of cryomodule, at first, the input coupler conditioning at room temperature is done with detuned cavities. After cooldown, the cavity conditioning, which is the main part in the performance test, is done by monitoring the radiation level measured at three locations around the cryomodule, and the heating and RF output at two HOM (Higher Order Mode) couplers. Consequently, it became clear the average accelerating gradient is 30 MV/m for STF-2 cryomodule (39 MV/m at max. and 15 MV/m at min.), and the second cavity string with four cavities had the significant performance degradation by heavy field emission due to the additional clean room work in the STF tunnel. As the following next steps, there are the LFD (Lorenz Force Detuning) measurement, LFD compensation by piezo, and long run for check of stable operation at high gradient. In the long run around 32 MV/m, each cavity without degradation showed the stable operation with the successful LFD compensation by piezo and RF feedback system. In this paper, the detailed test result will be presented.

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WEPMB039

Operation Techniques for HWR1 Cryomodule

PLC, EPICS, controls, radiation

2205

H. Kim, J.W. Choi, Y.W. Jo, W.K. Kim, Y. Kim, M. Lee
IBS, Daejeon, Republic of Korea

Control systems such as PLC and EPICS are developed for a half-wave resonator (HWR) cryomodule. PLC rack is fabricated for the HWR1 cryomodule. The PLC controls pumps, heaters and valves. The PLC communicates with temperature monitors through Ethernet. HMI of PLC and EPICS controls and monitors pumps, heaters, valves and temperature sensors through switching hub. The PLC HMI is developed and EPICS is also developed. The CSS of EPICS consists of control, monitor, parameter set-up, alarm and data browser screen.

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WEPMB051

HIE-ISOLDE: First Commissioning Experience

solenoid, operation, controls, cavity

2230

W. Venturini Delsolaro, E. Bravin, N. Delruelle, M. Elias, J.A. Ferreira Somoza, M.A. Fraser, J. Gayde, Y. Kadi, G. Kautzmann, F. Klumb, Y. Leclercq, M. Martino, V. Parma, J.A. Rodriguez, S. Sadovich, E. Siesling, D. Smekens, L. Valdarno, D. Valuch, P. Zhang
CERN, Geneva, Switzerland

The HIE ISOLDE project [1] reached a major milestone in October 2015, with the start of the first physics run with radioactive ion beams. This achievement was the culminating point of intense months during which the first cryomodule of the HIE ISOLDE superconducting Linac and its high-energy beam transfer lines were first installed and subsequently brought into operation. Hardware commissioning campaigns were conducted in order to define the envelope of parameters within which the machine could be operated, to test and validate software and controls, and to investigate the limitations preventing the systems to reach their design performance. Methods and main results of the first commissioning of HIE ISOLDE post accelerator, including the performance of the superconducting cavities with beam, will be reviewed in this contribution.

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WEPMR004

Cryomdoule Test Stand Reduced-Magnetic Support Design at Fermilab

cavity, SRF, vacuum, linac

2262

M.W. McGee, S.K. Chandrasekaran, A.C. Crawford, E.R. Harms, J.R. Leibfritz, G. Wu
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy
In a partnership with SLAC National Accelerator Laboratory (SLAC) and Jefferson Lab, Fermilab will assemble and test 17 of the 35 total 1.3 GHz cryomodules for the Linac Coherent Light Source II (LCLS-II) Project. These devices will be tested at Fermilab's Cryomodule Test Facility (CMTF) within the Cryomodule Test Stand (CMTS-1) cave. The problem of magnetic pollution became one of major issues during design stage of the LCLS-II cryomodule as the average quality factor of the accelerating cavities is specified to be 2.7 x 10¹⁰. One of the possible ways to mitigate the effect of stray magnetic fields and to keep it below the goal of 5 mGauss involves the application of low permeable materials. Initial permeability and magnetic measurement studies regarding the use of 316L stainless steel material indicated that cold work (machining) and heat affected zones from welding would be acceptable.

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WEPMR005

Investigation of Thermal Acoustic Effects on SRF Cavities within CM1 at Fermilab

cavity, operation, cryogenics, acceleration

2265

M.W. McGee, E.R. Harms, A.L. Klebaner, J.R. Leibfritz, A. Martinez, Y.M. Pischalnikov, W. Schappert
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy.
Two TESLA-style 8-cavity cryomodules have been operated at Fermilab Accelerator Science and Technology (FAST), formerly the Superconducting Radio Frequency (SRF) Accelerator Test Facility. Operational instabilities were revealed during Radio Frequency (RF) power studies. These observations were complemented by the characterization of thermal acoustic effects on cavity microphonics manifested by apparent noisy boiling of helium involving vapor bubble and liquid vibration. The thermal acoustic measurements also consider pressure and temperature spikes which drive the phenomenon at low and high frequencies.

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WEPMR006

Transport of LCLS-II 1.3 GHz Cryomodule to SLAC

vacuum, acceleration, alignment, cavity

2268

M.W. McGee, T.T. Arkan, T.J. Peterson, Z. Tang
Fermilab, Batavia, Illinois, USA
S.R. Boo, M. Carrasco
SLAC, Menlo Park, California, USA
E. Daly, N.A. Huque
JLab, Newport News, Virginia, USA

Funding: Operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02- 07CH11359 with the U.S. Department of Energy.
In a partnership with SLAC National Accelerator Laboratory (SLAC) and Jefferson Lab, Fermilab will assemble and test 17 of the 35 total 1.3 GHz cryomodules for the Linac Coherent Light Source II (LCLS-II) Project. These include a prototype built and delivered by each Lab. Another two 3.9 GHz cryomodules will be built, tested and transported by Fermilab to SLAC. Each assembly will be transported over-the-road from Fermilab or Jefferson Lab using specific routes to SLAC. The transport system consists of a base frame, isolation fixture and upper protective truss. The strongback cryomodule lifting fixture is described along with other supporting equipment used for both over-the-road transport and local (on-site) transport at Fermilab. Initially, analysis of fragile components and stability studies will be performed in order to assess the risk associated with over-the-road transport of a fully assembled cryomodule.

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WEPMR009

Magnetic Flux Expulsion Studies in Niobium SRF Cavities

cavity, niobium, background, survey

2277

S. Posen, M. Checchin, A.C. Crawford, A. Grassellino, M. Martinello, O.S. Melnychuk, A. Romanenko, D.A. Sergatskov, Y. Trenikhina
Fermilab, Batavia, Illinois, USA

With the recent discovery of nitrogen doping treatment for SRF cavities, ultra-high quality factors at medium accelerating fields are regularly achieved in vertical RF tests. To preserve these quality factors into the cryomodule, it is important to consider background magnetic fields, which can become trapped in the surface of the cavity during cooldown and cause Q₀ degradation. Building on the recent discovery that spatial thermal gradients during cooldown can significantly improve expulsion of magnetic flux, a detailed study was performed of flux expulsion on two cavities with different furnace treatments that are cooled in magnetic fields amplitudes representative of what is expected in a realistic cryomodule. In this contribution, we summarize these cavity results, in order to improve understanding of the impact of flux expulsion on cavity performance.

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WEPMR011

Simulations and Experimental Studies of Third Harmonic 3.9 Ghz CW Couplers for LCLS-II Project

cavity, operation, simulation, linac

2280

N. Solyak, I.V. Gonin, E.R. Harms, S. Kazakov, T.N. Khabiboulline, A. Lunin
Fermilab, Batavia, Illinois, USA

LCLS-II linac is based on SRF technology developed for the XFEL project. The XFEL 3rd harmonic system built by INFN is based on the original designs of cavity and power coupler developed and built by Fermilab for the FLASH facility at DESY. For LCLS-II application both designs of the 3.9 GHz cavity and the power coupler have been modified for an operation in the continuous wave regime up to 2 kW average RF power. In this paper we discuss coupler modifications and the result multiphysics analysis for various operating regimes. For the initial test of a proposed design, we decided to modify two spare warm sections of power couplers, built for the FLASH facility, by shortening both of two inner bellows and making a thicker copper plating. Modification of the existing coupler test stand and the test program are briefly discussed in this paper.

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WEPMR012

Misalignment Studies of LCLS-II SC Linac

linac, emittance, network, alignment

2283

A. Saini, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA
T.O. Raubenheimer
SLAC, Menlo Park, California, USA

The Linac Coherent Light Source (LCLS) is an x-ray free electron laser facility. The proposed upgrade of the LCLS facility is based on construction of a 4 GeV superconducting (SC) linear accelerator (linac). An optimal reliable performance of the linac is largely determined by beam sensitivity to various component alignment errors. In this paper we evaluate misalignment tolerances of LCLSII SC linac using a more realistic alignment model that includes correlated misalignment of elements.

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WEPMR018

Time Resolved Cryogenic Cooling Analysis of the Cornell Injector Cryomodule

HOM, cryogenics, simulation, operation

2298

R.G. Eichhorn, A.C. Bartnik, B.M. Dunham, G.M. Ge, G.H. Hoffstaetter, H. Lee, M. Liepe, S.R. Markham, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

To demonstrate key parameters of a an energy recovery linac (ERL) at Cornel, an injector based on a photo gun and an SRF cryomodule was designed and built. The goal was to demonstrate high current generation while achieving low emittances. While the emittance goal has been reached, the current achieved so far is 75 mA. Even though this is a world record, it is still below the targeted 100 mA. While ramping up the current we observed excessive heating in the fundamental power coupler which we were able to track down to insufficient cooling of the 80 K intercepts. These intercepts are cooled by a stream of parallel cryogenic flows which we found to be unbalanced. In this paper we will review the finding, describe the analysis we did, modeling of the parallel flow and the modifications made to the module to overcome the heating.

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WEPMR020

First Cool-down of the Cornell ERL Main Linac Cryo-Module

cavity, linac, HOM, vacuum

2305

R.G. Eichhorn, J.V. Conway, F. Furuta, G.M. Ge, D. Gonnella, T. Gruber, G.H. Hoffstaetter, J.J. Kaufman, M. Liepe, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Cornell University has finished building a 10 m long superconducting accelerator module as a prototype of the main linac of a proposed ERL facility. This module houses 6 superconducting cavities- operated at 1.8 K in continuous wave (CW) mode with a design field of 16 MV/m and a Quality factor of 2x10¹⁰. We wil shortly review the design and focus on reporting on the first cool-down of this module. We will giving data for various cool-down scenarios (fast/ slow), uniformity and performance

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WEPMR021

HOM Measurements for Cornell's High-current CW ERL Cryomodule

HOM, cavity, simulation, linac

2309

F. Furuta, R.G. Eichhorn, G.M. Ge, D. Gonnella, G.H. Hoffstaetter, M. Liepe, P. Quigley, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

The main linac cryomodule (MLC) for the future energy-recovery linac (ERL) based synchrotron-light facility at Cornell had been designed, fabricated, and tested. It houses 6 SRF cavities with individual higher order-modes (HOMs)absorbers and one magnet/ BPM section. We will report the HOM study on MLC.

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WEPMR022

ERL Main Linac Cryomodule Cavity Performance and Effect of Thermal Cycling

cavity, linac, SRF, target

2312

F. Furuta, J. Dobbins, R.G. Eichhorn, G.M. Ge, D. Gonnella, G.H. Hoffstaetter, M. Liepe, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Cornell has designed, fabricated, and tested a high current (100 mA) CW SRF prototype cryomodule for the future energy-recovery linac (ERL) based synchrotron-light facility at Cornell . It houses six 7-cell SRF cavities with individual HOM absorbers and one magnet/ BPM section. Cavities are targeted to operate with high Qo of 2.0·10¹⁰ at 16.2 MV/m, 1.8 K in continuous wave (CW) mode. We will report the RF test results of 7-cell cavities in this cryomodule after initial cooldown and several thermal cycles with different cooldown method.

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WEPOR031

Field Emission Radiation Characterization of LCLS-II Cavities

cavity, radiation, detector, linac

2736

M. Santana-Leitner, C. Adolphsen, L. Ge, Z. Li, T.O. Raubenheimer, M.C. Ross
SLAC, Menlo Park, California, USA
S. Aderhold, A. Grassellino, O.S. Melnychuk, R.V. Pilipenko, D.A. Sergatskov
Fermilab, Batavia, Illinois, USA

Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515
LCLS-II XFEL facility at the SLAC National Accelerator Laboratory will accelerate CW beams of up to 300 uA to 4 GeV using superconducting radio frequency cavities. Before installation, fully assembled cryomodules will be tested at Fermilab and Jefferson Lab. Besides the basic measurements of cavity gradients and cryogenic heat loads, radiation and dark current levels will be recorded. The latter parameters need to be limited to ensure the safety of the machine and the lifetime of radio-sensitive components installed near the cavities. In this paper we describe the simulation studies being done in preparation of tests, where expected radiation measurements in the different detectors are correlated with field emission and with dark currents in Faraday cups at each end of the cryomodule. This work includes simulations using a detailed model of the cryomodules and detectors, where field emission data generated with Track3P is parsed to the FLUKA radiation transport code.

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WEPOR035

MicroTCA.4-Based LLRF System for Spoke Cavities of C-ADS Injector I

LLRF, cavity, operation, controls

2749

X. Ma, N. Gan, X. Huang, N. Liu, R.L. Liu, G.W. Wang, Q.Y. Wang
IHEP, Beijing, People's Republic of China
H.Y. Lin
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China

The C-ADS Injector I is being built in IHEP, which includes 14 β=0.12 superconducting single spoke cavities enclosed with two cryomodules under 2 K. The MicroTCA.4-based Low Level RF (LLRF) system provides GDR mode for the operation of the cavities. The LLRF system supports both CW and duty-adjustable pulsed operation modes for the high power source and the cavities. The firmware of the FPGA controller and the EPICS IOC software has been upgraded during the last half year adding feedforward and abnormal detection. The operator interface (OPI) software and automatic operation script are also described. The MicroTCA.4 platform runs well for the beam commissioning of the Injector I. Some gained experiences with stable beam operation are also shown.

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WEPOR043

End-to-end FEL Beam Stability Simulation Engine

cavity, simulation, linac, software

2768

C. Serrano, L.R. Doolittle
LBNL, Berkeley, California, USA
D.S. Driver, B. Patel, A.F. Queiruga, Z. Zaky
UCB, Berkeley, USA
Q. Llimona
UPF, Barcelona, Spain

Funding: Work supported by U.S. Department of Energy
During the design, commissioning and operation of a linac-driven Free Electron Laser (FEL) it is important to have a good understanding of the implications of accelerator design choices on beam figures of merit. This simulation engine combines a full state-space model of the RF system (High-Power Amplifier, RF cavities, LLRF controllers, etc.), a characterization of beam properties such as energy, bunch length and arrival time as electrons propagate through the Linac and beam-based feedback. The combination of these models with the ability to introduce both correlated and uncorrelated noise sources at any point of the machine, allows for a complete transposition of noise sources to beam performance parameters, including frequency dependence, in order to analyze implications of accelerator design choices in a simulation environment.

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THYB01

Performance of Superconducting Cavities for the European XFEL

cavity, operation, SRF, vacuum

3186

D. Reschke
DESY, Hamburg, Germany

The superconducting accelerator of the European XFEL consists of the injector part and the main linac. The injector includes one 1.3 GHz accelerator module and one 3.9 GHz third harmonic module, while the main linac consists of 100 accelerator modules, each housing eight 1.3 GHz TESLA-type cavities, operated at an average design gradient of 23.6 MV/m. The fabrication and surface treatment by industry as well as the vertical and cryomodule RF tests of the required 808 superconducting 1.3GHz cavities are analysed and presented.

Slides THYB01 [3.227 MB]

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THOBB03

Root Causes of Field Emitters in SRF Cavities Placed in CEBAF Tunnel

cavity, SRF, vacuum, operation

3198

R.L. Geng
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
It has been suspected that appearance of new field emitters can occur in SRF cavities after their placement in accelerator tunnel for long term beam operation. This apparently has been the case for CEBAF. However, no physical evidence has been shown in the past. In this contribution, we will report on the recent results concerning the root cause of field emitters in SRF cavities placed in CEBAF tunnel. We will discuss these results in the context of high-reliability and low-cryogenic-loss operation of CEBAF.

Slides THOBB03 [3.768 MB]

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THPMR003

Failure Modes and Beam Losses Studies in ILC Bunch Compressors and Main Linac

beam-losses, quadrupole, linac, cavity

3388

A. Saini, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Proposed International linear collider (ILC) involves high average beam power. Dealing with high average beam power and smaller beam sizes result in stringent tolerances on beam losses and therefore, extensive studies are required to investigate every possible scenarios that lead to beam losses. In this paper we discuss beam losses due to failure of critical elements in beamline for ILC bunch compressors and main linac.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR003

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THPMY003

Design of the RISP Vacuum Systems

vacuum, ion, linac, simulation

3657

D. Jeon, J.H. Cho, K.B. Lim, H.J. Son, J. Song, S.W. Yoon
IBS, Daejeon, Republic of Korea
H.S. Choi, T. Ha
PAL, Pohang, Republic of Korea
S.R. In
KAERI, Daejon, Republic of Korea
B.C. Kim, K.P. Kim, K.M. Kim, Y.S. Kim
NFRI, Republic of Korea

The vacuum requirement of the RISP heavy ion accel-erator facility has been derived that meets the beam loss requirement and the vacuum system design is carried out using the 3D Molflow+ code verifying the vacuum re-quirement. We used realistic outgassing values of the materials of the vacuum chambers and beam pipes. We are designing detailed vacuum system specification and configuration including pumps, gate valves, and vacuum gauges along with the interlock system and differential pumping stations.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY003

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FRYAA02

ESS Progressing into Construction

linac, neutron, target, beam-transport

4266

M. Lindroos, H. Danared, M. Eshraqi, R. Garoby, A. Jansson, Y.I. Levinsen, C.A. Martins, A. Ponton
ESS, Lund, Sweden

The construction of the European Spallation Source, ESS, started in summer 2014. At the site in Lund, the accelerator tunnel will be completed at the time of IPAC16, while prototyping and manufacturing or prepara-tions for manpower contributions are going on in more 23 laboratories distributed over the 12 European countries collaborating on the accelerator project. Major technical milestones have been reached include the testing of su-perconducting cavity prototypes of two families to values above design gradients, the first ESS modulator has been tested to 90 kV and the first klystron prototype has been received in April 2016. Equally important developments are taking place at many partner laboratories. The presen-tation will summarize the status of the ESS accelerator project by the time of IPAC16..

Slides FRYAA02 [66.734 MB]

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-FRYAA02

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