IPAC2016 - List of Keywords (factory)

Paper	Title	Other Keywords	Page
MOPMB051	Cavity BPM Performance Online Evaluation using PCA Method	cavity, experiment, electron, coupling	208
	Y.B. Leng, L.W. Lai, L.Y. Yu, R.X. Yuan SSRF, Shanghai, People's Republic of China J. Chen, Z.C. Chen SINAP, Shanghai, People's Republic of China
	Funding: NSFS 11575282 This article proposes a new test method to evaluate the performance of cavity beam position monitors using the actual beam as the exciting signal. The new method sepa-rates the signals of different modes and improves the measurement accuracy by eliminating unwanted cou-plings from other sources.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB051
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MOPMY005	Study of Pretuning and High Power Test of DTL Iris Waveguide Couplers Using a Single Cell Cavity	cavity, DTL, coupling, simulation	522
	S.W. Lee, M.S. Champion, Y.W. Kang ORNL, Oak Ridge, Tennessee, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S.DOE. Six drift tube linac (DTL) cavities have been operating successfully at the Spallation Neutron Source (SNS). Each cavity is fed by a tapered ridge waveguide iris input coupler and a waveguide ceramic disk window. The original couplers and cavities have been in service for more than a decade. Design optimization and tuning of the couplers were initially performed prior to installation and commissioning of the cavities. Since each DTL cavity is unique, expensive, and fully utilized for neutron production, none of the cavity structure is available as a test cavity or a spare. Maintaining spares for operations and for future system upgrade, test setup of the iris couplers for precision tuning is needed. Ideally a smaller cavity structure may be used for pretuning and RF conditioning of the iris couplers as a test cavity or a bridge waveguide. In this paper, study of using a single cell cavity for the iris tuning and conditioning is presented along with the 3D simulation results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY005
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MOPMY031	Development of a 500 MHz Solid-state RF Amplifier as a Combination of Ten Modules	operation, status, interface, rf-amplifier	563
	T.-C. Yu, F.-Y. Chang, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Z.K. Liu, C.H. Lo, C.L. Tsai, M.H. Tsai, Ch. Wang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	The recent development of semiconductor technology has proved that a solid-state RF amplifier is an attractive alternative high-power RF source for numerous accelera-tor applications. Because of the great redundancy and reliability of solid-state amplifiers present in many facili-ties worldwide, the development of a kW-level RF power per module using compact planar baluns has also been undertaken in NSRRC. Ten amplifier modules are com-bined to achieve stable output power 8 kW as an initial conceptual realization of a basic power unit within a combined network. This article describes each portion of the amplifier with the experimental results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMY031
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TUPMR015	Cooling and Heat Transfer of the IRANCYC-10 Transmission Line	impedance, simulation, cyclotron, cavity	1259
	S. Sabounchi, H. Afarideh, M. Mohamadian, M. Salehi AUT, Tehran, Iran J.-S. Chai, M. Ghergherehchi SKKU, Suwon, Republic of Korea
	Heat transfer study for designing RF transmission line in cyclotrons is crucial. Because of enormous amount of surface current on RF transmission line, despite high conductivity of copper, significant amount of heat is being generated, which is enough for altering characteristic impedance and other desirable parameters for transmission line. So, effective cooling system which is nourished by central chiller system is essential. For design of cooling system in RF transmission line suitable mass flow, appropriate geometry and confined temperatures are prominent in order to avoid eroding and impedance changing. In this paper an attempt has been done for accurate analyzing and simulating of heat transfer phenomenon for the 10MeV cyclotron (IRANCYC-10 ) which is under construction at AmirKabir University of Technology. By using Ansys CFX simulation software, the optimum cooling line geometry and mass flow rate of 90 gr/s for cooling water, has been resulted.
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TUPMR060	Improvement of 18 MeV Cyclotron Magnet Design by TOSCA Code	cyclotron, simulation, resonance, betatron	1397
	N. Rahimpour Kalkhoran, H. Afarideh, R. Solhju AUT, Tehran, Iran J.-S. Chai, M. Ghergherehchi SKKU, Suwon, Republic of Korea
	According to increasing need to cyclotrons in the world, designing and manufacturing of these machines are considered. Therefore designing of 18 MeV cyclotron magnet has begun at Amirkabir University Of Technology. Magnet is one of the most important parts of the cyclotron, so in designing of magnet, all other components of cyclotron which influence on magnet, should be considered. Since the achievable energy for particle is determined 18MeV, designed magnet has AVF structure. TOSCA (Opera-3D) code was selected for simulation and analysis. First of all, theoretical calculations and estimations were done and magnetic field data according to radius were achieved, after that, simulation with initial estimations and a simple model of magnet was begun and optimization process continued until magnetic field results from the simulation coincided with the theoretical one. Different shimmings were used for better coincidence. Some results contains magnetic field on middle plane and betatron oscillations were checked. Also working points of the cyclotron with resonance regions were checked. According to use reliable mesh, the accuracy of simulation results is sufficient high.
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TUPMY010	Status of Mice Step IV	emittance, experiment, optics, scattering	1562
	P.M. Hanlet IIT, Chicago, Illinois, USA
	Funding: STFC, DOE, NSF, INFN, CHIPP AND MORE Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for lepton-antilepton collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling–the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam. MICE is being constructed in a series of Steps. The configuration currently in operation at the Rutherford Appleton Laboratory is optimised for the study the properties of liquid hydrogen and lithium hydride that affect cooling. The plans for data taking in the present configuration will be described together with a summary of the status of preparation of the experimental configuration by which MICE will demonstration the principle of ionization cooling. Submitted by the MICE speakers bureau that will identify later a member of the collaboration to present the contribution
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY010
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TUPMY044	Carbon and Mercury Target Systems for Muon Colliders and Neutrino Factories	target, proton, emittance, collider	1641
	K.T. McDonald PU, Princeton, New Jersey, USA J.S. Berg, H.G. Kirk, D. Stratakis BNL, Upton, Long Island, New York, USA X.P. Ding UCLA, Los Angeles, California, USA
	Funding: Work supported in part by US DOE Contract NO. DE-AC02-98CH110886 A high-power target is required to convert a powerful MW-class proton beam into an intense muon source or neutrino source in support of physics at the intensity frontier. The first phase of a Muon Collider or Neutrino Factory program may use a 6.75-GeV proton driver with beam power of only 1 MW. At this lower power it is favorable to use a graphite target with beam and target tilted slightly to the axis of a 20-T pion-capture solenoid around the target. Using the MARS15 (2014) code, we optimized the geometric parameters of the beam and target to maximize particle production at low energies by an incoming proton beam with kinetic energy of 6.75 GeV impinging on this carbon target. We also studied beam-dump configurations to suppress the rate of undesirable high-energy secondary particles in the beam. For a possible upgrade to a proton beam of multi-MW power, we considered a free-flowing mercury jet.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY044
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WEPMB035	SRF Cavities for RAON	cavity, SRF, TRIUMF, accelerating-gradient	2200
	H.C. Jung, J. Joo, J. Lee IBS, Daejeon, Republic of Korea R.E. Laxdal, Z.Y. Yao TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	SRF cavities of superconducting linear accelerators in RAON are developed and tested at 2K/4K. 1st Quarter Wave Resonator (QWR) and Half Wave Resonator (HWR) are fabricated by a domestic vender and tested in the TRIUMF's facility. The measured Q factors are above the required values at the operating gradients. And the predicted multipacting phenomena are observed in the test and easily conditioned. The Q factors decreased after a slow cooldown and enhanced at 4K tests by a low temperature baking. Based on these tests, modified bare cavities are newly developed, jacketed and will be tested with tuners and power couplers.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB035
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WEPMR002	Ultimate Gradient Limitation in Niobium Superconducting Accelerating Cavities	simulation, SRF, niobium, cryogenics	2254
	M. Checchin, A. Grassellino, M. Martinello, S. Posen, A. Romanenko Fermilab, Batavia, Illinois, USA M. Checchin, M. Martinello Illinois Institute of Technology, Chicago, Illlinois, USA J. Zasadzinski IIT, Chicago, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The present study is addressed to the theoretical description of the ultimate gradient limitation in SRF cavities. Our intent is to exploit experimental data to confirm models which provide feed-backs on how to improve the current state-of-art. New theoretical insight on the cavities limiting factor can be suitable to improve the quench field of N-doped cavities, and therefore to take advantage of high Q0 at high gradients.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR002
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WEPMR003	Tailoring Surface Impurity Content to Maximize Q-factors of Superconducting Resonators	cavity, superconductivity, niobium, simulation	2258
	M. Martinello, M. Checchin, A. Grassellino, O.S. Melnychuk, S. Posen, A. Romanenko, D.A. Sergatskov Fermilab, Batavia, Illinois, USA M. Checchin, M. Martinello Illinois Institute of Technology, Chicago, Illlinois, USA J. Zasadzinski IIT, Chicago, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 with the United States Department of Energy. Quality factor of superconducting radio-frequency (SRF) cavities is degraded whenever magnetic flux is trapped in the cavity walls during the cooldown. In this contribution we study how the trapped flux sensitivity, defined as the trapped flux surface resistance normalized for the amount of flux trapped, depends on the mean free path. A variety of 1.3 GHz cavities with different surface treatments (EP, 120 C bake and different N-doping) were studied in order to cover the largest range of mean free path nowadays achievable, from few to thousands of nanometers. A bell shaped trend appears for the range of mean free path studied. Over doped cavities falls at the maximum of this curve defining the largest values of sensitivity. In addition, we have also studied the trend of the BCS surface resistance contribution as a function of mean free path, revealing that N-doped cavities follow close to the theoretical minimum of the BCS surface resistance as a function of the mean free path. Adding these results together we unveil that optimal N-doping treatment allows to maximize Q-factor at 2 K and 16 MV/m until the magnetic field fully trapped during the cavity cooldown stays below 10 mG.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR003
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WEPMR030	Pulsed Field Limits in SRF Cavities	cavity, SRF, niobium, klystron	2341
	J.T. Maniscalco, D. Gonnella, D.L. Hall, P.N. Koufalis, M. Liepe Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	High-power pulsed (HPP) measurements of SRF cavities offer several different avenues of experimentation from standard continuous wave (CW) measurements by probing higher fields and reducing thermal effects. In this paper we report upon recent measurements of N-doped Nb and Nb3Sn cavities, investigating the limitations of the superheating field, flux entry field, and other maximum fields. We also investigate the potential of these materials for operation in a pulsed accelerator, which would partially or fully mitigate the effects of defects (i.e. thermal quenches).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR030
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WEPOR051	Second Generation LHC Analysis Framework: Workload-based and User-oriented Solution	experiment, simulation, framework, data-analysis	2784
	S. Boychenko, C. Aguilera-Padilla, M.A. Galilée, J.C. Garnier, A.A. Gorzawski, K.H. Krol, J. Makai, M. Osinski, M.C. Poeschl, T.M. Ribeiro, A. Stanisz, M. Zerlauth CERN, Geneva, Switzerland M.Z. Rela University of Coimbra, Coimbra, Portugal
	Consolidation and upgrades of accelerator equipment during the first long LHC shutdown period enabled particle collisions at energy levels almost twice higher compared to the first operational phase. Consequently, the software infrastructure providing vital information for machine operation and its optimisation needs to be updated to keep up with the challenges imposed by the increasing amount of collected data and the complexity of analysis. Current tools, designed more than a decade ago, have proven their reliability by significantly outperforming initially provisioned workloads, but are unable to scale efficiently to satisfy the growing needs of operators and hardware experts. In this paper we present our progress towards the development of a new workload-driven solution for LHC transient data analysis, based on identified user requirements. An initial setup and study of modern data storage and processing engines appropriate for the accelerator data analysis was conducted. First simulations of the proposed novel partitioning and replication approach, targeting a highly efficient service for heterogeneous analysis requests, were designed and performed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR051
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WEPOY007	Simulation of Electromagnetic Scattering Through the E-XFEL Third Harmonic Cavity Module	cavity, simulation, HOM, dipole	3001
	N.Y. Joshi, R.M. Jones UMAN, Manchester, United Kingdom N. Baboi, L. Shi DESY, Hamburg, Germany
	Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 31245. N.~Y.~Joshi receives additional funding from The Cockcroft Institute of Science and Technology. The European-XFEL is being fabricated in Hamburg to serve as an X-ray Free Electron Laser (FEL) light source. The electron beam will be accelerated through linacs consisting of 1.3 GHz superconducting cavities along a length of 2.1 km. In addition, third harmonic cavities will improve the quality of the beam by linearising the field profile and hence reducing the energy spread. There are eight 3.9 GHz cavities within a single module AH1 of E-XFEL. The beam-excited electromagnetic (EM) field in these cavities can be decomposed into a series of eigenmodes. These modes are, in general, not cut-off between one cavity and the next, as they are able to couple to each other throughout the module. Here for the first time, we evaluate components of the scattering matrix for module AH1. This is a computationally expensive system, and hence we employ a Generalized Scattering Matrix (GSM) technique to allow rapid computation with reduced memory requirements. Verification is provided on reduced structures, which are compared to finite element mesh-based codes. The mode spectrum for the dipole bands of interest in an eight-cavity chain have been calculated and external Q factors for the modes are derived.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY007
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WEPOY059	Axisymmetric Numerical Studies of Higher Order Mode Damping Techniques using Ring Ferrites for BESSY VSR	cavity, damping, HOM, storage-ring	3132
	B. Riemann, B.D. Isbarn, M. Sommer, T. Weis DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF under contract no. 05K13PEB. Utilizing superconducting multicell rf cavities with fundamental frequencies of 1.5 GHz and 1.75 GHz and therefore modulating the rf gradient, the upcoming BESSY II upgrade BESSY VSR aims to provide both short and long electron bunches simultaneously. However, beam induced excitation of higher order modes (HOM) inside those superconducting cavities is a major concern for beam stability in a recirculating accelerator. Thus it is important to develop and apply proper HOM damping techniques. Current design considerations involve HOM coupler which usually introduce discontinuities in the cross section while also breaking the axisymmetry. To circumvent these issues we investigate in a layout with ring ferrites as an alternative or additional HOM damping technique. We also present an alternative superstructure setup that uses two instead of four cavities for VSR.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY059
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THEA01	Learn to Read Korean: An Introduction to the Hangul Alphabet	ion, insertion, site, distributed	3207
	Z. Handel University of Washington, Seattle, Washington, USA
	In the mid 15th century the Korean scholar-king Sejong invented Hangul, the native Korean alphabet. This was the beginning of a long process by which Hangul has gradually supplanted Chinese characters as Korea's primary script, a process which is still ongoing today. This presentation will introduce the historical and cultural background behind the invention of Hangul and describe the systematic linguistic principles on which it is based. The 1446 text that introduced Hangul proclaimed that it was so simple that "a wise man can master it in a morning, and even a stupid person can learn it in ten days." We will put this claim to the test by attempting to learn to read Korean during the 30-minute presentation.
	Slides THEA01 [14.724 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THEA01
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THPMB041	Optics-measurement-based BPM Calibration	optics, dipole, injection, focusing	3328
	A. Garcia-Tabares, F.S. Carlier, J.M. Coello de Portugal, A. Langner, E.H. Maclean, L. Malina, T. Persson, P.K. Skowroński, M. Solfaroli Camillocci, R. Tomás CERN, Geneva, Switzerland
	The LHC beta functions (β) can be measured using the phase or the amplitude of betatron oscillations obtained with beam position monitors (BPMs). Using the amplitude information results in a β measurement affected by BPM calibration. This work aims at calibrating BPMs using optics measurements. For this, βs from amplitude and phase and normalized dispersion obtained from many different measurements in 2015 with different optics and corrections are analyzed. Simulations are also performed to support the analyses.
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THPMB053	nuSTORM FFAG Decay Ring	lattice, resonance, storage-ring, closed-orbit	3369
	J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom A.D. Bross, A. Liu Fermilab, Batavia, Illinois, USA J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.
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THPMY031	The Methods to Optimize Power Usage for Chiller System of TPS Utility	controls, operation, experiment, synchrotron	3725
	C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.Y. Liu, Z.-D. Tsai NSRRC, Hsinchu, Taiwan
	The recently completed Taiwan Photon Source (TPS) is one of the brightest synchrotron X-ray sources in the world. It will offer 500 mA beam current at 3 GeV for all kinds of different subject experiments and novel scientific ideas. This facility will be the most inspiring trigger to Taiwan's scientific research in the twenty-first century. In order to make sure this giant machine operate properly, the utility system plays a very important role. Not only for the giant machine, the utility system also takes responsibility for providing a cozy environment for all staff. Furthermore, the requirements of air condition in some critical areas are very strict even to ± 0.1°C temperature accuracy. All of it cost a large amount of energy to satisfy everyone's demand. According to the annual budget report of NSRRC, the total charge of electricity and water was more than 80 million N.T. dollars per year before TPS project, and increased by nearly twice after TPS inauguration. Since the government budget is limited, the whole utility system must be operated under more economic ways to use energy more efficiently.
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THPOR009	Cepc Partial Double Ring Lattice Design	lattice, dynamic-aperture, dipole, luminosity	3785
	F. Su Institute of High Energy Physics (IHEP), People's Republic of China S. Bai, T.J. Bian, Z. Duan, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao, G. Xu, Y. Zhang IHEP, Beijing, People's Republic of China
	In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. In this paper, we discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR009
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THPOR015	CEPC Bunch Lengthening and Cavity HOM Analysis	HOM, resonance, cavity, collider	3805
	H.J. Zheng, J. Gao, Y. Wang IHEP, Beijing, People's Republic of China
	In this paper we will show the higher order mode (HOM) analysis of the cavity for the Circular Electron-Positron Collider (CEPC) partial double ring (PDR) scheme. In order to study the single bunch longitudinal instability in CEPC, bunch lengthening and energy spread are estimated based on Gao's theory. Different models are used to study the bunch lengthening and energy spread of the ring.
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THPOW033	Transient Orbit of Injection in Taiwan Light Source Storage Ring	injection, kicker, storage-ring, network	4012
	H.C. Chen, H.H. Chen, K.T. Hsu, C.H. Huang, S.J. Huang, C.H. Kuo, A.P. Lee, J.A. Li, Y.K. Lin NSRRC, Hsinchu, Taiwan
	Top-up operation has been started since many years ago at Taiwan Light Source Storage Ring (SR). For this operation it is important to reduce the beam injections should not excite the oscillation of stored beams. For further reduction of these oscillations, corrections with kicker-magnets are used. The details of the study will be reported in this paper.
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Paper

Title

Other Keywords

Page

MOPMB051

Cavity BPM Performance Online Evaluation using PCA Method

cavity, experiment, electron, coupling

208

Y.B. Leng, L.W. Lai, L.Y. Yu, R.X. Yuan
SSRF, Shanghai, People's Republic of China
J. Chen, Z.C. Chen
SINAP, Shanghai, People's Republic of China

Funding: NSFS 11575282
This article proposes a new test method to evaluate the performance of cavity beam position monitors using the actual beam as the exciting signal. The new method sepa-rates the signals of different modes and improves the measurement accuracy by eliminating unwanted cou-plings from other sources.

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MOPMY005

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

cavity, DTL, coupling, simulation

522

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

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

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MOPMY031

Development of a 500 MHz Solid-state RF Amplifier as a Combination of Ten Modules

operation, status, interface, rf-amplifier

563

T.-C. Yu, F.-Y. Chang, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Z.K. Liu, C.H. Lo, C.L. Tsai, M.H. Tsai, Ch. Wang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

The recent development of semiconductor technology has proved that a solid-state RF amplifier is an attractive alternative high-power RF source for numerous accelera-tor applications. Because of the great redundancy and reliability of solid-state amplifiers present in many facili-ties worldwide, the development of a kW-level RF power per module using compact planar baluns has also been undertaken in NSRRC. Ten amplifier modules are com-bined to achieve stable output power 8 kW as an initial conceptual realization of a basic power unit within a combined network. This article describes each portion of the amplifier with the experimental results.

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TUPMR015

Cooling and Heat Transfer of the IRANCYC-10 Transmission Line

impedance, simulation, cyclotron, cavity

1259

S. Sabounchi, H. Afarideh, M. Mohamadian, M. Salehi
AUT, Tehran, Iran
J.-S. Chai, M. Ghergherehchi
SKKU, Suwon, Republic of Korea

Heat transfer study for designing RF transmission line in cyclotrons is crucial. Because of enormous amount of surface current on RF transmission line, despite high conductivity of copper, significant amount of heat is being generated, which is enough for altering characteristic impedance and other desirable parameters for transmission line. So, effective cooling system which is nourished by central chiller system is essential. For design of cooling system in RF transmission line suitable mass flow, appropriate geometry and confined temperatures are prominent in order to avoid eroding and impedance changing. In this paper an attempt has been done for accurate analyzing and simulating of heat transfer phenomenon for the 10MeV cyclotron (IRANCYC-10 ) which is under construction at AmirKabir University of Technology. By using Ansys CFX simulation software, the optimum cooling line geometry and mass flow rate of 90 gr/s for cooling water, has been resulted.

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TUPMR060

Improvement of 18 MeV Cyclotron Magnet Design by TOSCA Code

cyclotron, simulation, resonance, betatron

1397

N. Rahimpour Kalkhoran, H. Afarideh, R. Solhju
AUT, Tehran, Iran
J.-S. Chai, M. Ghergherehchi
SKKU, Suwon, Republic of Korea

According to increasing need to cyclotrons in the world, designing and manufacturing of these machines are considered. Therefore designing of 18 MeV cyclotron magnet has begun at Amirkabir University Of Technology. Magnet is one of the most important parts of the cyclotron, so in designing of magnet, all other components of cyclotron which influence on magnet, should be considered. Since the achievable energy for particle is determined 18MeV, designed magnet has AVF structure. TOSCA (Opera-3D) code was selected for simulation and analysis. First of all, theoretical calculations and estimations were done and magnetic field data according to radius were achieved, after that, simulation with initial estimations and a simple model of magnet was begun and optimization process continued until magnetic field results from the simulation coincided with the theoretical one. Different shimmings were used for better coincidence. Some results contains magnetic field on middle plane and betatron oscillations were checked. Also working points of the cyclotron with resonance regions were checked. According to use reliable mesh, the accuracy of simulation results is sufficient high.

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TUPMY010

Status of Mice Step IV

emittance, experiment, optics, scattering

1562

P.M. Hanlet
IIT, Chicago, Illinois, USA

Funding: STFC, DOE, NSF, INFN, CHIPP AND MORE
Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for lepton-antilepton collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling–the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam. MICE is being constructed in a series of Steps. The configuration currently in operation at the Rutherford Appleton Laboratory is optimised for the study the properties of liquid hydrogen and lithium hydride that affect cooling. The plans for data taking in the present configuration will be described together with a summary of the status of preparation of the experimental configuration by which MICE will demonstration the principle of ionization cooling.
Submitted by the MICE speakers bureau that will identify later a member of the collaboration to present the contribution

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TUPMY044

Carbon and Mercury Target Systems for Muon Colliders and Neutrino Factories

target, proton, emittance, collider

1641

K.T. McDonald
PU, Princeton, New Jersey, USA
J.S. Berg, H.G. Kirk, D. Stratakis
BNL, Upton, Long Island, New York, USA
X.P. Ding
UCLA, Los Angeles, California, USA

Funding: Work supported in part by US DOE Contract NO. DE-AC02-98CH110886
A high-power target is required to convert a powerful MW-class proton beam into an intense muon source or neutrino source in support of physics at the intensity frontier. The first phase of a Muon Collider or Neutrino Factory program may use a 6.75-GeV proton driver with beam power of only 1 MW. At this lower power it is favorable to use a graphite target with beam and target tilted slightly to the axis of a 20-T pion-capture solenoid around the target. Using the MARS15 (2014) code, we optimized the geometric parameters of the beam and target to maximize particle production at low energies by an incoming proton beam with kinetic energy of 6.75 GeV impinging on this carbon target. We also studied beam-dump configurations to suppress the rate of undesirable high-energy secondary particles in the beam. For a possible upgrade to a proton beam of multi-MW power, we considered a free-flowing mercury jet.

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WEPMB035

SRF Cavities for RAON

cavity, SRF, TRIUMF, accelerating-gradient

2200

H.C. Jung, J. Joo, J. Lee
IBS, Daejeon, Republic of Korea
R.E. Laxdal, Z.Y. Yao
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

SRF cavities of superconducting linear accelerators in RAON are developed and tested at 2K/4K. 1st Quarter Wave Resonator (QWR) and Half Wave Resonator (HWR) are fabricated by a domestic vender and tested in the TRIUMF's facility. The measured Q factors are above the required values at the operating gradients. And the predicted multipacting phenomena are observed in the test and easily conditioned. The Q factors decreased after a slow cooldown and enhanced at 4K tests by a low temperature baking. Based on these tests, modified bare cavities are newly developed, jacketed and will be tested with tuners and power couplers.

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WEPMR002

Ultimate Gradient Limitation in Niobium Superconducting Accelerating Cavities

simulation, SRF, niobium, cryogenics

2254

M. Checchin, A. Grassellino, M. Martinello, S. Posen, A. Romanenko
Fermilab, Batavia, Illinois, USA
M. Checchin, M. Martinello
Illinois Institute of Technology, Chicago, Illlinois, USA
J. Zasadzinski
IIT, Chicago, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The present study is addressed to the theoretical description of the ultimate gradient limitation in SRF cavities. Our intent is to exploit experimental data to confirm models which provide feed-backs on how to improve the current state-of-art. New theoretical insight on the cavities limiting factor can be suitable to improve the quench field of N-doped cavities, and therefore to take advantage of high Q0 at high gradients.

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WEPMR003

Tailoring Surface Impurity Content to Maximize Q-factors of Superconducting Resonators

cavity, superconductivity, niobium, simulation

2258

M. Martinello, M. Checchin, A. Grassellino, O.S. Melnychuk, S. Posen, A. Romanenko, D.A. Sergatskov
Fermilab, Batavia, Illinois, USA
M. Checchin, M. Martinello
Illinois Institute of Technology, Chicago, Illlinois, USA
J. Zasadzinski
IIT, Chicago, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Quality factor of superconducting radio-frequency (SRF) cavities is degraded whenever magnetic flux is trapped in the cavity walls during the cooldown. In this contribution we study how the trapped flux sensitivity, defined as the trapped flux surface resistance normalized for the amount of flux trapped, depends on the mean free path. A variety of 1.3 GHz cavities with different surface treatments (EP, 120 C bake and different N-doping) were studied in order to cover the largest range of mean free path nowadays achievable, from few to thousands of nanometers. A bell shaped trend appears for the range of mean free path studied. Over doped cavities falls at the maximum of this curve defining the largest values of sensitivity. In addition, we have also studied the trend of the BCS surface resistance contribution as a function of mean free path, revealing that N-doped cavities follow close to the theoretical minimum of the BCS surface resistance as a function of the mean free path. Adding these results together we unveil that optimal N-doping treatment allows to maximize Q-factor at 2 K and 16 MV/m until the magnetic field fully trapped during the cavity cooldown stays below 10 mG.

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WEPMR030

Pulsed Field Limits in SRF Cavities

cavity, SRF, niobium, klystron

2341

J.T. Maniscalco, D. Gonnella, D.L. Hall, P.N. Koufalis, M. Liepe
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

High-power pulsed (HPP) measurements of SRF cavities offer several different avenues of experimentation from standard continuous wave (CW) measurements by probing higher fields and reducing thermal effects. In this paper we report upon recent measurements of N-doped Nb and Nb3Sn cavities, investigating the limitations of the superheating field, flux entry field, and other maximum fields. We also investigate the potential of these materials for operation in a pulsed accelerator, which would partially or fully mitigate the effects of defects (i.e. thermal quenches).

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WEPOR051

Second Generation LHC Analysis Framework: Workload-based and User-oriented Solution

experiment, simulation, framework, data-analysis

2784

S. Boychenko, C. Aguilera-Padilla, M.A. Galilée, J.C. Garnier, A.A. Gorzawski, K.H. Krol, J. Makai, M. Osinski, M.C. Poeschl, T.M. Ribeiro, A. Stanisz, M. Zerlauth
CERN, Geneva, Switzerland
M.Z. Rela
University of Coimbra, Coimbra, Portugal

Consolidation and upgrades of accelerator equipment during the first long LHC shutdown period enabled particle collisions at energy levels almost twice higher compared to the first operational phase. Consequently, the software infrastructure providing vital information for machine operation and its optimisation needs to be updated to keep up with the challenges imposed by the increasing amount of collected data and the complexity of analysis. Current tools, designed more than a decade ago, have proven their reliability by significantly outperforming initially provisioned workloads, but are unable to scale efficiently to satisfy the growing needs of operators and hardware experts. In this paper we present our progress towards the development of a new workload-driven solution for LHC transient data analysis, based on identified user requirements. An initial setup and study of modern data storage and processing engines appropriate for the accelerator data analysis was conducted. First simulations of the proposed novel partitioning and replication approach, targeting a highly efficient service for heterogeneous analysis requests, were designed and performed.

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WEPOY007

Simulation of Electromagnetic Scattering Through the E-XFEL Third Harmonic Cavity Module

cavity, simulation, HOM, dipole

3001

N.Y. Joshi, R.M. Jones
UMAN, Manchester, United Kingdom
N. Baboi, L. Shi
DESY, Hamburg, Germany

Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 31245. N.~Y.~Joshi receives additional funding from The Cockcroft Institute of Science and Technology.
The European-XFEL is being fabricated in Hamburg to serve as an X-ray Free Electron Laser (FEL) light source. The electron beam will be accelerated through linacs consisting of 1.3 GHz superconducting cavities along a length of 2.1 km. In addition, third harmonic cavities will improve the quality of the beam by linearising the field profile and hence reducing the energy spread. There are eight 3.9 GHz cavities within a single module AH1 of E-XFEL. The beam-excited electromagnetic (EM) field in these cavities can be decomposed into a series of eigenmodes. These modes are, in general, not cut-off between one cavity and the next, as they are able to couple to each other throughout the module. Here for the first time, we evaluate components of the scattering matrix for module AH1. This is a computationally expensive system, and hence we employ a Generalized Scattering Matrix (GSM) technique to allow rapid computation with reduced memory requirements. Verification is provided on reduced structures, which are compared to finite element mesh-based codes. The mode spectrum for the dipole bands of interest in an eight-cavity chain have been calculated and external Q factors for the modes are derived.

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WEPOY059

Axisymmetric Numerical Studies of Higher Order Mode Damping Techniques using Ring Ferrites for BESSY VSR

cavity, damping, HOM, storage-ring

3132

B. Riemann, B.D. Isbarn, M. Sommer, T. Weis
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF under contract no. 05K13PEB.
Utilizing superconducting multicell rf cavities with fundamental frequencies of 1.5 GHz and 1.75 GHz and therefore modulating the rf gradient, the upcoming BESSY II upgrade BESSY VSR aims to provide both short and long electron bunches simultaneously. However, beam induced excitation of higher order modes (HOM) inside those superconducting cavities is a major concern for beam stability in a recirculating accelerator. Thus it is important to develop and apply proper HOM damping techniques. Current design considerations involve HOM coupler which usually introduce discontinuities in the cross section while also breaking the axisymmetry. To circumvent these issues we investigate in a layout with ring ferrites as an alternative or additional HOM damping technique. We also present an alternative superstructure setup that uses two instead of four cavities for VSR.

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THEA01

Learn to Read Korean: An Introduction to the Hangul Alphabet

ion, insertion, site, distributed

3207

Z. Handel
University of Washington, Seattle, Washington, USA

In the mid 15th century the Korean scholar-king Sejong invented Hangul, the native Korean alphabet. This was the beginning of a long process by which Hangul has gradually supplanted Chinese characters as Korea's primary script, a process which is still ongoing today. This presentation will introduce the historical and cultural background behind the invention of Hangul and describe the systematic linguistic principles on which it is based. The 1446 text that introduced Hangul proclaimed that it was so simple that "a wise man can master it in a morning, and even a stupid person can learn it in ten days." We will put this claim to the test by attempting to learn to read Korean during the 30-minute presentation.

Slides THEA01 [14.724 MB]

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THPMB041

Optics-measurement-based BPM Calibration

optics, dipole, injection, focusing

3328

A. Garcia-Tabares, F.S. Carlier, J.M. Coello de Portugal, A. Langner, E.H. Maclean, L. Malina, T. Persson, P.K. Skowroński, M. Solfaroli Camillocci, R. Tomás
CERN, Geneva, Switzerland

The LHC beta functions (β) can be measured using the phase or the amplitude of betatron oscillations obtained with beam position monitors (BPMs). Using the amplitude information results in a β measurement affected by BPM calibration. This work aims at calibrating BPMs using optics measurements. For this, βs from amplitude and phase and normalized dispersion obtained from many different measurements in 2015 with different optics and corrections are analyzed. Simulations are also performed to support the analyses.

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THPMB053

nuSTORM FFAG Decay Ring

lattice, resonance, storage-ring, closed-orbit

3369

J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A.D. Bross, A. Liu
Fermilab, Batavia, Illinois, USA
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.

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THPMY031

The Methods to Optimize Power Usage for Chiller System of TPS Utility

controls, operation, experiment, synchrotron

3725

C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.Y. Liu, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

The recently completed Taiwan Photon Source (TPS) is one of the brightest synchrotron X-ray sources in the world. It will offer 500 mA beam current at 3 GeV for all kinds of different subject experiments and novel scientific ideas. This facility will be the most inspiring trigger to Taiwan's scientific research in the twenty-first century. In order to make sure this giant machine operate properly, the utility system plays a very important role. Not only for the giant machine, the utility system also takes responsibility for providing a cozy environment for all staff. Furthermore, the requirements of air condition in some critical areas are very strict even to ± 0.1°C temperature accuracy. All of it cost a large amount of energy to satisfy everyone's demand. According to the annual budget report of NSRRC, the total charge of electricity and water was more than 80 million N.T. dollars per year before TPS project, and increased by nearly twice after TPS inauguration. Since the government budget is limited, the whole utility system must be operated under more economic ways to use energy more efficiently.

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THPOR009

Cepc Partial Double Ring Lattice Design

lattice, dynamic-aperture, dipole, luminosity

3785

F. Su
Institute of High Energy Physics (IHEP), People's Republic of China
S. Bai, T.J. Bian, Z. Duan, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao, G. Xu, Y. Zhang
IHEP, Beijing, People's Republic of China

In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. In this paper, we discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization.

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THPOR015

CEPC Bunch Lengthening and Cavity HOM Analysis

HOM, resonance, cavity, collider

3805

H.J. Zheng, J. Gao, Y. Wang
IHEP, Beijing, People's Republic of China

In this paper we will show the higher order mode (HOM) analysis of the cavity for the Circular Electron-Positron Collider (CEPC) partial double ring (PDR) scheme. In order to study the single bunch longitudinal instability in CEPC, bunch lengthening and energy spread are estimated based on Gao's theory. Different models are used to study the bunch lengthening and energy spread of the ring.

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THPOW033

Transient Orbit of Injection in Taiwan Light Source Storage Ring

injection, kicker, storage-ring, network

4012

H.C. Chen, H.H. Chen, K.T. Hsu, C.H. Huang, S.J. Huang, C.H. Kuo, A.P. Lee, J.A. Li, Y.K. Lin
NSRRC, Hsinchu, Taiwan

Top-up operation has been started since many years ago at Taiwan Light Source Storage Ring (SR). For this operation it is important to reduce the beam injections should not excite the oscillation of stored beams. For further reduction of these oscillations, corrections with kicker-magnets are used. The details of the study will be reported in this paper.

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