HB2016 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MOAM2P20	The LINAC4 Project	linac, emittance, DTL, injection	1
	A.M. Lombardi CERN, Geneva, Switzerland
	Linac4 is a normal conducting, 160 MeV H⁻ ion accelerator that is being constructed within the scope of the LHC injectors upgrade project. Linac4 will be connected to the Proton Synchrotron Booster (PSB) during the next long LHC shut-down and it will replace the current 50 MeV hadron linac, Linac2. Linac4 is presently being commissioned, with the aim of achieving the final energy at the end of the year. A test of the injection chicane and a reliability run will follow. The beam commissioning, in steps of increasing energy, has been prepared by an extended series of studies and interlaced with phases of installation. In this paper we will detail the beam dynamics challenges and we will report on the commissioning results.
	Slides MOAM2P20 [27.527 MB]
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MOAM3P30	The ESS Accelerator	linac, klystron, target, LLRF	6
	H. Danared, M. Eshraqi, M. Jensen ESS, Lund, Sweden
	The European Spallation Source, ESS, is a facility for research using neutron beams that is being built in Lund. It will be the world’s most powerful such facility when it comes into full operation in the next decade. Neutrons will be released from a rotating tungsten target when it is hit by 2 GeV protons provided by a superconducting linac at an unprecedented 5 MW of average beam power, serving 22 neutron instruments covering a wide range of fundamental and applied sciences. An overview of the project will be given, with emphasis on technology. Current status, plans and challenges will be reviewed.
	Slides MOAM3P30 [21.103 MB]
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MOPM3P01	Beam Optics Simulations Study on the Pre-Stripper Linac for Rare Isotope Science Project	linac, cryomodule, simulation, ion	31
	J.-W. Kim, J.-H. Jang, H. Jin IBS, Daejeon, Republic of Korea Z.A. Conway, B. Mustapha, P.N. Ostroumov ANL, Argonne, Illinois, USA
	Funding: This work was supported by the Rare Isotope Science Project of the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning and the National Research Foundation of Korea. The rare isotope science project (RISP) under development in Korea aims to provide various heavy-ion beams for nuclear and applied science users. A pre-stripper linac is the first superconducting section to be constructed for the acceleration of both stable and radioisotope beams to the energy of 18.5 Mev/u with a DC equivalent voltage of 160 MV. The current baseline design consists of an ECR ion source, an RFQ, cryomodules with QWR and HWR cavities and quadruple focusing magnets in the warm sections between cryomodules. Recently we have developed an alternative design in collaboration with Argonne's Linac Development Group to layout the linac based on state-of-the-art ANL's QWR operating at 81.25 MHz and multi-cavity cryomodules of the type used for the ATLAS upgrade and Fermilab PIP-II projects. End-to-end beam dynamics calculations have been performed to ensure an optimized design with no beam losses. The numbers of required cavities and cryomodules are significantly reduced in the alternative design. The results of beam optics simulations and error sensitivity studies are discussed.
	Slides MOPM3P01 [12.736 MB]
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MOPM4P01	Challenges and Performance of the C-ADS Injector System	rfq, linac, proton, operation	36
	Y.L. Chi IHEP, Beijing, People's Republic of China
	Along with the rapid development of nuclear power plants in China, treatment of the nuclear waste has become a crucial issue. Supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (CAS), The Chinese ADS project is now on-going based on the collaboration of several Chinese institutions. In the end of year 2015, China Initiative ADS (CIADS) program is approved by Chinese government, will construct in the Guangdong province south part of China. The proton accelerator of Chinese ADS is a superconducting CW linear accelerator. Its energy is 1.5GeV, with beam current of 10mA. Institute of High Energy Physics (IHEP) and Institute of Modern Physics (IMP) are responsible to developing this superconducting CW linear accelerator. In the injector part there are many challenges to developing several different low beta superconducting cavities and related hardware’s such like LLRF system etc. In this paper presents the progress of two different injector development including SC cavities and related hardware’s and performance test of two injectors and key hardware’s, and also brief introduction of CIADS program.
	Slides MOPM4P01 [3.751 MB]
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MOPR007	Cold and High Power Test of Large Size Magnetic Alloy Core for XiPAF's Synchrotron	impedance, experiment, synchrotron, proton	59
	G.R. Li, X. Guan, W.-H. Huang, X.W. Wang, Z. Yang, H.J. Yao, H.J. Zeng, S.X. Zheng TUB, Beijing, People's Republic of China
	A compact magnetic alloy (MA) loaded cavity is under development for XiPAF's synchrotron. The cavity contains 6 large size MA cores, each is independently coupled with solid state power amplifier. Two types of MA core are proposed for the project. We have developed a single core model cavity to verify the impedance model and to test the properties of MA cores under high power state. The high power test results are presented and discussed.
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MOPR011	The SPS 200 MHz TWC Impedance after the LIU Upgrade	HOM, simulation, impedance, pick-up	76
	T. Roggen, R. Calaga, F. Caspers, T. Kaltenbacher, C. Vollinger CERN, Geneva, Switzerland
	Funding: Fellowship co-funded by the European Union as a Marie Curie action (Grant agreement PCOFUND-GA-2010-267194) within the Seventh Framework Programme for Research and Technological Development. As a part of the LHC Injectors Upgrade project (LIU) the 200 MHz Travelling Wave Cavities (TWC) of the Super Proton Synchrotron (SPS) will be upgraded. The two existing five-section cavities will be rearranged into four three-section cavities (using two existing spare sections), thereby increasing the total voltage from 7 MV (I_RF = 1.5 A) to 10 MV (I_RF = 3.0 A). Projections of the HL-LHC (High Luminosity Large Hadron Collider) era are conceived by the macro-particle simulation code BLonD, that makes use of an impedance model of the SPS, developed from a thorough survey of machine elements. This paper analyses the impedance contribution of the 200 MHz cavities in the two configurations, using electromagnetic simulations. Measurements of the existing cavities in the SPS and a single-section prototype are also presented.
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MOPL025	Transient Beam Loading Based Calibration for Cavity Phase and Amplitude Setting	beam-loading, linac, controls, resonance	250
	R. Zeng ESS, Lund, Sweden O. Troeng Lund University, Lund, Sweden
	Traditional phase scan method for cavity phase and amplitude setting is offline and hard to track the variations of environment and operation points. An alternative beam loading based calibration method is investigated in this paper, which might become useful online/real time calibration method.
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TUPM2Y01	Beam Commissioning Results for the CSNS MEBT and DTL-1	DTL, emittance, rfq, linac	329
	J. Peng, M.T. Li, X.H. Lu CSNS, Guangdong Province, People's Republic of China Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, Y.D. Liu, S. Wang, S.Y. Xu, Y. Yuan IHEP, Beijing, People's Republic of China
	The China Spallation Neutron Source (CSNS) is designed to deliver a 1.6GeV proton beam to a solid metal target for neutron scattering research. It will be constructed in two phases. In the 1st phase, the beam power is designed to be 100kW. In the 2nd phase, the beam power will be upgraded to 500kW by doubling the linac output energy and beam current. The accelerator complex consists of a 50keV H⁻ ion source, a 3MeV Radio Frequency Quadrupole (RFQ), a 80MeV Drift tube Linac (DTL), and a 1.6GeV rapid-cycling synchrotron (RCS). Until March 2016, the front end and the first tank of DTL have been fully commissioned. The primary design goals of peak current, transverse emittance and beam energy have been achieved. This paper reports on the methods and the results of the commissioning.
	Slides TUPM2Y01 [2.398 MB]
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TUPM6Y01	Commissioning of C-ADS Injector I	rfq, emittance, solenoid, proton	348
	J.S. Cao, H. Geng, R.L. Liu, C. Meng, Y.F. Sui, F. Yan, Q. Ye IHEP, Beijing, People's Republic of China
	As a test facility, the design goal of C-ADS Injector I is a 10mA, 10MeV CW proton linac, which uses a 3.2MeV normal conducting RFQ and superconducting single-spoke cavities for accelerating. The RF frequency of C-ADS Injector I accelerator is 325 MHz. In accordance to the progress of construction and considering the technical difficulties, the beam commissioning of C-ADS Injector I is carried out in 3 phases: Phase 1, with ECRIS + LEBT + RFQ + MEBT + TCM (two superconducting cavities), to reach 3.6 MeV; Phase 2, with ECRIS + LEBT + RFQ + MEBT + CM1 (seven superconducting cavities), to reach 5 MeV; Phase 3, with ECRIS + LEBT + RFQ + MEBT + CM¹⁺ CM2 (same as CM1), to finally achieve the design goal of C-ADS Injector I. This paper summarizes the beam commissioning in 3 phases and focusing on the third phase.
	Slides TUPM6Y01 [3.617 MB]
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WEPM1X01	Performance of Linac-4 Instrumentation During Commissioning	emittance, laser, linac, DTL	385
	U. Raich CERN, Geneva, Switzerland
	Linac-4 is CERN’s new H⁻ Linac, which will replace the aging Linac-2 proton machine. Linac-4 is being built and commissioned in stages. While the machine is permanently equipped with the standard beam instrumentation necessary to ensure smooth operation, three dedicated measurement benches have also been designed to commission the source and LEBT at 45 keV, the MEBT and its chopper at 3 MeV as well as the first DTL tank at 12 MeV and finally the full DTL at 50 MeV and CCDTL at 100 MeV. The beam after the PIMS structures at the Linac’s full energy of 160 MeV will be sent to a beam dump and commissioned with permanently installed instruments. Installation and commissioning of the machine up to the CCDTL is now complete. This contribution will present the results from the various commissioning stages, showing the performance of the various diagnostic devices used and comparing the data obtained to simulations.
	Slides WEPM1X01 [10.600 MB]
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WEAM1Y01	A Coupled RFQ-IH-DTL Cavity for FRANZ: A Challenge for RF Technology and Beam Dynamics	rfq, DTL, coupling, neutron	404
	R. Tiede, O. Meusel, H. Podlech, U. Ratzinger, A. Schempp, M. Schwarz IAP, Frankfurt am Main, Germany M. Heilmann GSI, Darmstadt, Germany D. Mäder BEVATECH, Frankfurt, Germany
	For the 'Frankfurt Neutron Source at the Stern-Gerlach-Zentrum' (FRANZ) facility an inductively coupled combination of a 4-rod radio-frequency-quadrupole (RFQ) and an 8 gap interdigital H-type (IH-DTL) structure will provide the main acceleration of an intense proton beam from 120 keV to 2.0 MeV. The RFQ-IH combination with a total length of about 2.3 m will be operated at 175 MHz in cw mode. The expected total power need is around 200 kW. Due to the internal inductive coupling only one RF amplifier is needed, which significantly reduces the investment costs. At present the RFQ is installed separately in the beam line for conditioning up to the design rf power and for measuring the beam quality behind the RFQ. In parallel, the IH-DTL is rf tuned together with a dummy RFQ outside the FRANZ cave. This paper will present the status of the project with emphasis on key questions like beam dynamics constraints, rf tuning issues and technological challenges resulting from the high thermal load in cw operation.
	Slides WEAM1Y01 [3.756 MB]
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WEAM2Y01	Overview of the CSNS Linac LLRF and Operational Experiences During Beam Commissioning	LLRF, controls, linac, FPGA	409
	Z.C. Mu IHEP, Beijing, People's Republic of China J. Li, M.F. Liu, L.Y. Rong, M.L. Wan, B. Wang, Z.X. Xie, X.A. Xu, Y. Yao, Z. Zhang, W. Zhou CSNS, Guangdong Province, People's Republic of China
	The CSNS Linac is comprised of RFQ, two Buncher cavities, four DTL accelerators and one Debuncher cavity. The RFQ accelerator is powered by two 4616 vacuum tubes, the maximum output power of each tube is 350kW. Three 25kW solid state amplifiers supply RF power for two Buncher cavities and the Debuncher cavity, repectively. The RF power sources of four DTL accelerators are four 3MW klystrons. Each RF power source owns a set of digital LLRF control system in order to realize an accelerating field stability of ±1% in amplitude and ±1° in phase. The front four LLRF control systems have been used in the beam commissioning of CSNS Linac from the end of 2015. This paper will introduce the design and the performance of the LLRF control system.
	Slides WEAM2Y01 [6.097 MB]
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WEAM4Y01	Design and Prototyping of the Spoke Cyromodule for ESS	cryomodule, cryogenics, vacuum, linac	416
	P. Duthil, S. Bousson, S. Brault, F. Chatelet, P. Duchesne, N. Gandolfo, D. Longuevergne, G. Olry, M. Pierens, E. Rampnoux, D. Reynet IPN, Orsay, France C. Darve, N. Elias ESS, Lund, Sweden
	A cryomodule integrating two superconducting radiofrequency (SRF) double Spoke cavities and their RF power couplers is now being assembled at IPNO. It is the prototype version of the 13 future cryomodules composing a 56 meters long double Spoke section which will be operated for the first time in a linear accelerator (linac) for the European Spallation Source (ESS). ESS will be the most powerful neutron source feeding multidisplinary researches. This cryomodule provides the cryogenic environment for operating the two '=0.5 cavities at full power in a saturated superfluid helium bath at a temperature of 2 K. Thermally and magnetically shielded, they will each be fed by a 352 MHz electromagnetic wave, with a peak power of 400 kW, to generate an accelerating pulsed field of 9MV/m. For this operation, the prototype cryomodules includes all the interfaces with RF, cryogenics, vacuum, beam pipe and diagnostics. It will be tested by 2016 at IPNO by use of a test valve box which is also a prototype of the future Spoke cryogenic distribution system, another contribution to ESS. Both prototypes will then be tested at full power at Uppsala university FREIA facilities.
	Slides WEAM4Y01 [23.275 MB]
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WEPM2Y01	Model Benchmark With Experiment at the SNS Linac	linac, lattice, laser, space-charge	439
	A.P. Shishlo, A.V. Aleksandrov, M.A. Plum ORNL, Oak Ridge, Tennessee, USA Y. Liu ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. The history of attempts to perform a transverse matching in the SNS superconducting linac (SCL) is discussed. The SCL has 9 laser wire (LW) stations to perform nondestructive measurements of the transverse beam profiles. Any matching starts with the measurement of the initial Twiss parameters which in the SNS case was done by using the first four LW stations at the beginning of the superconducting linac. For years the consistency between all LW stations data could not be achieved. This problem was resolved only after significant improvements in accuracy of the phase scans of the SCL cavities, more precise analysis of all available scan data, better optics planning, and the initial longitudinal Twiss parameters measurements. The presented paper discusses in details these developed procedures.
	Slides WEPM2Y01 [2.815 MB]
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THAM4X01	Investigation to Improve Efficiency and Availability in Control and Operation of Superconducting Cavity at ESS	operation, klystron, LLRF, controls	474
	R. Zeng ESS, Lund, Sweden O. Troeng Lund University, Lund, Sweden
	The higher efficiency and higher availability (fault-tolerant oriented) of RF&Cavity system (with beam loading) to operate at, the more dynamic details needs to be identified, so as to have the abilities (a) to work at nonlinearities, (b) to work close to limitation, and (c) to change operation point quickly and correctly. Dynamic detail identifications rely heavily on high precision measuring and characterizing basic cavity parameters (Ql, R/Q, dynamic detuning, phase and amplitude) and system behaviours under beam-RF-cavity interactions. It is especially challenging to characterize these dynamics under varying operating points or environment. Advanced technologies in LLRF and ICS providing real time/online characterizing will be the key enablers for addressing such challenges. However, to be successful, the deployment of these technologies must be embedded within local conditions taking into account available resources, existing hardware/software structures and operation modes. Several improvement approaches will be introduced. For example, 15% or more energy efficiency improvement at ESS will be obtained by reduction of power overhead and optimization of operation.
	Slides THAM4X01 [2.165 MB]
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THAM1Y01	Beam Commissioning of C-ADS Linac Instrumentation	linac, rfq, emittance, instrumentation	529
	Y.F. Sui, J.S. Cao, J. He, H.Z. Ma, L. Wang, S.J. Wei, Q. Ye, L. Yu, J.H. Yue, X.Y. Zhao, Y. Zhao IHEP, People's Republic of China
	Funding: Work supported by China ADS Project (XDA03020000) and the National Natural Science Foundation of China (NO. 11205172, NO. 11475204). The China Accelerator Driven Subcritical system (C-ADS) linac, which is composed of an ECR ion source, a low energy beam transport line (LEBT), a radio frequency quadrupole accelerator (RFQ), a medium energy beam transport line (MEBT) and cryomodules with SRF cavities to boost the energy up to 10 MeV. The injector linac will be equipped with beam diagnostics to measure the beam position, the transverse profile and emittance, the beam phase as well as beam current and beam losses. Though many are conventional design, They can provide efficient operation of drive linac. This paper gives an overview and detail in beam commissioning of C-ADS linac beam instrumentation.
	Slides THAM1Y01 [7.594 MB]
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THAM3Y01	R&D on Micro-Loss Monitors for High Intensity Linacs like LIPAc	linac, neutron, SRF, beam-losses	538
	J. Marroncle, P. Abbon, A. Marchix CEA/IRFU, Gif-sur-Yvette, France M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	Before approaching the micro-loss monitor concept, we propose to present the high intensity Linac for which the R&D program was done, LIPAc (Linear IFIMIF Prototype Accelerator). This later is the feasibility accelerator demonstrator for the International Fusion Materials Irradiation Facility (IFMIF). IFMIF aims at providing a very intense neutron source (10¹⁸ neutron/m2/s) to test materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). LIPAc (1.125 MW deuteron beam) is in installation progress at Rokkasho (Japan). Then, we will focus on the feasibility study of the beam optimization inside the SRF Linac part. Commissioning of such high beam intensity has to be done with a different approach based on detection of micro-losses, CVD diamonds, set inside the cryomodule linac.
	Slides THAM3Y01 [2.261 MB]
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THPM8Y01	Beam Energy Loss in a β=0.09 SRF HWR Cavity for 100 mA Proton Acceleration	HOM, SRF, ion, factory	567
	F. Zhu, K.X. Liu, S.W. Quan, F. Wang, H.T.X. Zhong PKU, Beijing, People's Republic of China
	Funding: Work supported by National Basic Research Project (No.2014CB845504) There’s presently a growing demand for cw high current proton and deuteron linear accelerators based on superconducting technology to better support various fields of science. Up to now, high order modes (HOMs) studies induced by ion beams with current higher than 10mA and even 100 mA accelerated by low β non-elliptical Superconducting rf (SRF) cavities are very few. One of the main HOM related issues of the SRF linac is the HOM-induced power. HOM power is the important part of beam energy loss which is used to estimate the cryogenic losses. In this paper, we compare the beam energy loss induced by 100 mA beam passing through a β=0.09 HWR SRF cavity calculated from time domain solver and frequency domain cavity eigenmodes spectrum method.
	Slides THPM8Y01 [0.611 MB]
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THPM9Y01	An Advanced Procedure for Longitudinal Beam Matching for SC CW Heavy Ion Linac With Variable Output Energy	linac, ion, emittance, acceleration	571
	S. Yaramyshev, W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu GSI, Darmstadt, Germany K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, S. Yaramyshev MEPhI, Moscow, Russia M. Heilmann IAP, Frankfurt am Main, Germany
	A multi-stage programm for the developmnet of a heavy ion superconducting (SC) continuous wave (CW) linac is in progress at HIM (Mainz, Germany), GSI (Darmstadt, Germany) and IAP (Frankfurt, Germany). The main beam acceleration is provided by up to nine multi-gap CH cavities. Due to variable beam energy, which coud be provided by each cavity separate, a longitudinal beam matching to each cavity is extremely important. The linac should provide the beam for physics experiments, smothly varying the output particle energy from 3.5 to 7.3 MeV/u, simultaneously keeping high beam quality. A dedicated algorythm for such a complicate matching, providing for the optimum machine settings (voltage and rf phase for each cavity), has been developed. The description of method and the obtained reasuts are discussed in this paper.
	Slides THPM9Y01 [1.585 MB]
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Paper

Title

Other Keywords

Page

MOAM2P20

The LINAC4 Project

linac, emittance, DTL, injection

1

A.M. Lombardi
CERN, Geneva, Switzerland

Linac4 is a normal conducting, 160 MeV H⁻ ion accelerator that is being constructed within the scope of the LHC injectors upgrade project. Linac4 will be connected to the Proton Synchrotron Booster (PSB) during the next long LHC shut-down and it will replace the current 50 MeV hadron linac, Linac2. Linac4 is presently being commissioned, with the aim of achieving the final energy at the end of the year. A test of the injection chicane and a reliability run will follow. The beam commissioning, in steps of increasing energy, has been prepared by an extended series of studies and interlaced with phases of installation. In this paper we will detail the beam dynamics challenges and we will report on the commissioning results.

Slides MOAM2P20 [27.527 MB]

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MOAM3P30

The ESS Accelerator

linac, klystron, target, LLRF

6

H. Danared, M. Eshraqi, M. Jensen
ESS, Lund, Sweden

The European Spallation Source, ESS, is a facility for research using neutron beams that is being built in Lund. It will be the world’s most powerful such facility when it comes into full operation in the next decade. Neutrons will be released from a rotating tungsten target when it is hit by 2 GeV protons provided by a superconducting linac at an unprecedented 5 MW of average beam power, serving 22 neutron instruments covering a wide range of fundamental and applied sciences. An overview of the project will be given, with emphasis on technology. Current status, plans and challenges will be reviewed.

Slides MOAM3P30 [21.103 MB]

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MOPM3P01

Beam Optics Simulations Study on the Pre-Stripper Linac for Rare Isotope Science Project

linac, cryomodule, simulation, ion

31

J.-W. Kim, J.-H. Jang, H. Jin
IBS, Daejeon, Republic of Korea
Z.A. Conway, B. Mustapha, P.N. Ostroumov
ANL, Argonne, Illinois, USA

Funding: This work was supported by the Rare Isotope Science Project of the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning and the National Research Foundation of Korea.
The rare isotope science project (RISP) under development in Korea aims to provide various heavy-ion beams for nuclear and applied science users. A pre-stripper linac is the first superconducting section to be constructed for the acceleration of both stable and radioisotope beams to the energy of 18.5 Mev/u with a DC equivalent voltage of 160 MV. The current baseline design consists of an ECR ion source, an RFQ, cryomodules with QWR and HWR cavities and quadruple focusing magnets in the warm sections between cryomodules. Recently we have developed an alternative design in collaboration with Argonne's Linac Development Group to layout the linac based on state-of-the-art ANL's QWR operating at 81.25 MHz and multi-cavity cryomodules of the type used for the ATLAS upgrade and Fermilab PIP-II projects. End-to-end beam dynamics calculations have been performed to ensure an optimized design with no beam losses. The numbers of required cavities and cryomodules are significantly reduced in the alternative design. The results of beam optics simulations and error sensitivity studies are discussed.

Slides MOPM3P01 [12.736 MB]

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MOPM4P01

Challenges and Performance of the C-ADS Injector System

rfq, linac, proton, operation

36

Y.L. Chi
IHEP, Beijing, People's Republic of China

Along with the rapid development of nuclear power plants in China, treatment of the nuclear waste has become a crucial issue. Supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (CAS), The Chinese ADS project is now on-going based on the collaboration of several Chinese institutions. In the end of year 2015, China Initiative ADS (CIADS) program is approved by Chinese government, will construct in the Guangdong province south part of China. The proton accelerator of Chinese ADS is a superconducting CW linear accelerator. Its energy is 1.5GeV, with beam current of 10mA. Institute of High Energy Physics (IHEP) and Institute of Modern Physics (IMP) are responsible to developing this superconducting CW linear accelerator. In the injector part there are many challenges to developing several different low beta superconducting cavities and related hardware’s such like LLRF system etc. In this paper presents the progress of two different injector development including SC cavities and related hardware’s and performance test of two injectors and key hardware’s, and also brief introduction of CIADS program.

Slides MOPM4P01 [3.751 MB]

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MOPR007

Cold and High Power Test of Large Size Magnetic Alloy Core for XiPAF's Synchrotron

impedance, experiment, synchrotron, proton

59

G.R. Li, X. Guan, W.-H. Huang, X.W. Wang, Z. Yang, H.J. Yao, H.J. Zeng, S.X. Zheng
TUB, Beijing, People's Republic of China

A compact magnetic alloy (MA) loaded cavity is under development for XiPAF's synchrotron. The cavity contains 6 large size MA cores, each is independently coupled with solid state power amplifier. Two types of MA core are proposed for the project. We have developed a single core model cavity to verify the impedance model and to test the properties of MA cores under high power state. The high power test results are presented and discussed.

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MOPR011

The SPS 200 MHz TWC Impedance after the LIU Upgrade

HOM, simulation, impedance, pick-up

76

T. Roggen, R. Calaga, F. Caspers, T. Kaltenbacher, C. Vollinger
CERN, Geneva, Switzerland

Funding: Fellowship co-funded by the European Union as a Marie Curie action (Grant agreement PCOFUND-GA-2010-267194) within the Seventh Framework Programme for Research and Technological Development.
As a part of the LHC Injectors Upgrade project (LIU) the 200 MHz Travelling Wave Cavities (TWC) of the Super Proton Synchrotron (SPS) will be upgraded. The two existing five-section cavities will be rearranged into four three-section cavities (using two existing spare sections), thereby increasing the total voltage from 7 MV (I_RF = 1.5 A) to 10 MV (I_RF = 3.0 A). Projections of the HL-LHC (High Luminosity Large Hadron Collider) era are conceived by the macro-particle simulation code BLonD, that makes use of an impedance model of the SPS, developed from a thorough survey of machine elements. This paper analyses the impedance contribution of the 200 MHz cavities in the two configurations, using electromagnetic simulations. Measurements of the existing cavities in the SPS and a single-section prototype are also presented.

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MOPL025

Transient Beam Loading Based Calibration for Cavity Phase and Amplitude Setting

beam-loading, linac, controls, resonance

250

R. Zeng
ESS, Lund, Sweden
O. Troeng
Lund University, Lund, Sweden

Traditional phase scan method for cavity phase and amplitude setting is offline and hard to track the variations of environment and operation points. An alternative beam loading based calibration method is investigated in this paper, which might become useful online/real time calibration method.

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TUPM2Y01

Beam Commissioning Results for the CSNS MEBT and DTL-1

DTL, emittance, rfq, linac

329

J. Peng, M.T. Li, X.H. Lu
CSNS, Guangdong Province, People's Republic of China
Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, Y.D. Liu, S. Wang, S.Y. Xu, Y. Yuan
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) is designed to deliver a 1.6GeV proton beam to a solid metal target for neutron scattering research. It will be constructed in two phases. In the 1st phase, the beam power is designed to be 100kW. In the 2nd phase, the beam power will be upgraded to 500kW by doubling the linac output energy and beam current. The accelerator complex consists of a 50keV H⁻ ion source, a 3MeV Radio Frequency Quadrupole (RFQ), a 80MeV Drift tube Linac (DTL), and a 1.6GeV rapid-cycling synchrotron (RCS). Until March 2016, the front end and the first tank of DTL have been fully commissioned. The primary design goals of peak current, transverse emittance and beam energy have been achieved. This paper reports on the methods and the results of the commissioning.

Slides TUPM2Y01 [2.398 MB]

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TUPM6Y01

Commissioning of C-ADS Injector I

rfq, emittance, solenoid, proton

348

J.S. Cao, H. Geng, R.L. Liu, C. Meng, Y.F. Sui, F. Yan, Q. Ye
IHEP, Beijing, People's Republic of China

As a test facility, the design goal of C-ADS Injector I is a 10mA, 10MeV CW proton linac, which uses a 3.2MeV normal conducting RFQ and superconducting single-spoke cavities for accelerating. The RF frequency of C-ADS Injector I accelerator is 325 MHz. In accordance to the progress of construction and considering the technical difficulties, the beam commissioning of C-ADS Injector I is carried out in 3 phases: Phase 1, with ECRIS + LEBT + RFQ + MEBT + TCM (two superconducting cavities), to reach 3.6 MeV; Phase 2, with ECRIS + LEBT + RFQ + MEBT + CM1 (seven superconducting cavities), to reach 5 MeV; Phase 3, with ECRIS + LEBT + RFQ + MEBT + CM¹⁺ CM2 (same as CM1), to finally achieve the design goal of C-ADS Injector I. This paper summarizes the beam commissioning in 3 phases and focusing on the third phase.

Slides TUPM6Y01 [3.617 MB]

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WEPM1X01

Performance of Linac-4 Instrumentation During Commissioning

emittance, laser, linac, DTL

385

U. Raich
CERN, Geneva, Switzerland

Linac-4 is CERN’s new H⁻ Linac, which will replace the aging Linac-2 proton machine. Linac-4 is being built and commissioned in stages. While the machine is permanently equipped with the standard beam instrumentation necessary to ensure smooth operation, three dedicated measurement benches have also been designed to commission the source and LEBT at 45 keV, the MEBT and its chopper at 3 MeV as well as the first DTL tank at 12 MeV and finally the full DTL at 50 MeV and CCDTL at 100 MeV. The beam after the PIMS structures at the Linac’s full energy of 160 MeV will be sent to a beam dump and commissioned with permanently installed instruments. Installation and commissioning of the machine up to the CCDTL is now complete. This contribution will present the results from the various commissioning stages, showing the performance of the various diagnostic devices used and comparing the data obtained to simulations.

Slides WEPM1X01 [10.600 MB]

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WEAM1Y01

A Coupled RFQ-IH-DTL Cavity for FRANZ: A Challenge for RF Technology and Beam Dynamics

rfq, DTL, coupling, neutron

404

R. Tiede, O. Meusel, H. Podlech, U. Ratzinger, A. Schempp, M. Schwarz
IAP, Frankfurt am Main, Germany
M. Heilmann
GSI, Darmstadt, Germany
D. Mäder
BEVATECH, Frankfurt, Germany

For the 'Frankfurt Neutron Source at the Stern-Gerlach-Zentrum' (FRANZ) facility an inductively coupled combination of a 4-rod radio-frequency-quadrupole (RFQ) and an 8 gap interdigital H-type (IH-DTL) structure will provide the main acceleration of an intense proton beam from 120 keV to 2.0 MeV. The RFQ-IH combination with a total length of about 2.3 m will be operated at 175 MHz in cw mode. The expected total power need is around 200 kW. Due to the internal inductive coupling only one RF amplifier is needed, which significantly reduces the investment costs. At present the RFQ is installed separately in the beam line for conditioning up to the design rf power and for measuring the beam quality behind the RFQ. In parallel, the IH-DTL is rf tuned together with a dummy RFQ outside the FRANZ cave. This paper will present the status of the project with emphasis on key questions like beam dynamics constraints, rf tuning issues and technological challenges resulting from the high thermal load in cw operation.

Slides WEAM1Y01 [3.756 MB]

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WEAM2Y01

Overview of the CSNS Linac LLRF and Operational Experiences During Beam Commissioning

LLRF, controls, linac, FPGA

409

Z.C. Mu
IHEP, Beijing, People's Republic of China
J. Li, M.F. Liu, L.Y. Rong, M.L. Wan, B. Wang, Z.X. Xie, X.A. Xu, Y. Yao, Z. Zhang, W. Zhou
CSNS, Guangdong Province, People's Republic of China

The CSNS Linac is comprised of RFQ, two Buncher cavities, four DTL accelerators and one Debuncher cavity. The RFQ accelerator is powered by two 4616 vacuum tubes, the maximum output power of each tube is 350kW. Three 25kW solid state amplifiers supply RF power for two Buncher cavities and the Debuncher cavity, repectively. The RF power sources of four DTL accelerators are four 3MW klystrons. Each RF power source owns a set of digital LLRF control system in order to realize an accelerating field stability of ±1% in amplitude and ±1° in phase. The front four LLRF control systems have been used in the beam commissioning of CSNS Linac from the end of 2015. This paper will introduce the design and the performance of the LLRF control system.

Slides WEAM2Y01 [6.097 MB]

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WEAM4Y01

Design and Prototyping of the Spoke Cyromodule for ESS

cryomodule, cryogenics, vacuum, linac

416

P. Duthil, S. Bousson, S. Brault, F. Chatelet, P. Duchesne, N. Gandolfo, D. Longuevergne, G. Olry, M. Pierens, E. Rampnoux, D. Reynet
IPN, Orsay, France
C. Darve, N. Elias
ESS, Lund, Sweden

A cryomodule integrating two superconducting radiofrequency (SRF) double Spoke cavities and their RF power couplers is now being assembled at IPNO. It is the prototype version of the 13 future cryomodules composing a 56 meters long double Spoke section which will be operated for the first time in a linear accelerator (linac) for the European Spallation Source (ESS). ESS will be the most powerful neutron source feeding multidisplinary researches. This cryomodule provides the cryogenic environment for operating the two '=0.5 cavities at full power in a saturated superfluid helium bath at a temperature of 2 K. Thermally and magnetically shielded, they will each be fed by a 352 MHz electromagnetic wave, with a peak power of 400 kW, to generate an accelerating pulsed field of 9MV/m. For this operation, the prototype cryomodules includes all the interfaces with RF, cryogenics, vacuum, beam pipe and diagnostics. It will be tested by 2016 at IPNO by use of a test valve box which is also a prototype of the future Spoke cryogenic distribution system, another contribution to ESS. Both prototypes will then be tested at full power at Uppsala university FREIA facilities.

Slides WEAM4Y01 [23.275 MB]

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WEPM2Y01

Model Benchmark With Experiment at the SNS Linac

linac, lattice, laser, space-charge

439

A.P. Shishlo, A.V. Aleksandrov, M.A. Plum
ORNL, Oak Ridge, Tennessee, USA
Y. Liu
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
The history of attempts to perform a transverse matching in the SNS superconducting linac (SCL) is discussed. The SCL has 9 laser wire (LW) stations to perform nondestructive measurements of the transverse beam profiles. Any matching starts with the measurement of the initial Twiss parameters which in the SNS case was done by using the first four LW stations at the beginning of the superconducting linac. For years the consistency between all LW stations data could not be achieved. This problem was resolved only after significant improvements in accuracy of the phase scans of the SCL cavities, more precise analysis of all available scan data, better optics planning, and the initial longitudinal Twiss parameters measurements. The presented paper discusses in details these developed procedures.

Slides WEPM2Y01 [2.815 MB]

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THAM4X01

Investigation to Improve Efficiency and Availability in Control and Operation of Superconducting Cavity at ESS

operation, klystron, LLRF, controls

474

R. Zeng
ESS, Lund, Sweden
O. Troeng
Lund University, Lund, Sweden

The higher efficiency and higher availability (fault-tolerant oriented) of RF&Cavity system (with beam loading) to operate at, the more dynamic details needs to be identified, so as to have the abilities (a) to work at nonlinearities, (b) to work close to limitation, and (c) to change operation point quickly and correctly. Dynamic detail identifications rely heavily on high precision measuring and characterizing basic cavity parameters (Ql, R/Q, dynamic detuning, phase and amplitude) and system behaviours under beam-RF-cavity interactions. It is especially challenging to characterize these dynamics under varying operating points or environment. Advanced technologies in LLRF and ICS providing real time/online characterizing will be the key enablers for addressing such challenges. However, to be successful, the deployment of these technologies must be embedded within local conditions taking into account available resources, existing hardware/software structures and operation modes. Several improvement approaches will be introduced. For example, 15% or more energy efficiency improvement at ESS will be obtained by reduction of power overhead and optimization of operation.

Slides THAM4X01 [2.165 MB]

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THAM1Y01

Beam Commissioning of C-ADS Linac Instrumentation

linac, rfq, emittance, instrumentation

529

Y.F. Sui, J.S. Cao, J. He, H.Z. Ma, L. Wang, S.J. Wei, Q. Ye, L. Yu, J.H. Yue, X.Y. Zhao, Y. Zhao
IHEP, People's Republic of China

Funding: Work supported by China ADS Project (XDA03020000) and the National Natural Science Foundation of China (NO. 11205172, NO. 11475204).
The China Accelerator Driven Subcritical system (C-ADS) linac, which is composed of an ECR ion source, a low energy beam transport line (LEBT), a radio frequency quadrupole accelerator (RFQ), a medium energy beam transport line (MEBT) and cryomodules with SRF cavities to boost the energy up to 10 MeV. The injector linac will be equipped with beam diagnostics to measure the beam position, the transverse profile and emittance, the beam phase as well as beam current and beam losses. Though many are conventional design, They can provide efficient operation of drive linac. This paper gives an overview and detail in beam commissioning of C-ADS linac beam instrumentation.

Slides THAM1Y01 [7.594 MB]

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THAM3Y01

R&D on Micro-Loss Monitors for High Intensity Linacs like LIPAc

linac, neutron, SRF, beam-losses

538

J. Marroncle, P. Abbon, A. Marchix
CEA/IRFU, Gif-sur-Yvette, France
M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France

Before approaching the micro-loss monitor concept, we propose to present the high intensity Linac for which the R&D program was done, LIPAc (Linear IFIMIF Prototype Accelerator). This later is the feasibility accelerator demonstrator for the International Fusion Materials Irradiation Facility (IFMIF). IFMIF aims at providing a very intense neutron source (10¹⁸ neutron/m2/s) to test materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). LIPAc (1.125 MW deuteron beam) is in installation progress at Rokkasho (Japan). Then, we will focus on the feasibility study of the beam optimization inside the SRF Linac part. Commissioning of such high beam intensity has to be done with a different approach based on detection of micro-losses, CVD diamonds, set inside the cryomodule linac.

Slides THAM3Y01 [2.261 MB]

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THPM8Y01

Beam Energy Loss in a β=0.09 SRF HWR Cavity for 100 mA Proton Acceleration

HOM, SRF, ion, factory

567

F. Zhu, K.X. Liu, S.W. Quan, F. Wang, H.T.X. Zhong
PKU, Beijing, People's Republic of China

Funding: Work supported by National Basic Research Project (No.2014CB845504)
There’s presently a growing demand for cw high current proton and deuteron linear accelerators based on superconducting technology to better support various fields of science. Up to now, high order modes (HOMs) studies induced by ion beams with current higher than 10mA and even 100 mA accelerated by low β non-elliptical Superconducting rf (SRF) cavities are very few. One of the main HOM related issues of the SRF linac is the HOM-induced power. HOM power is the important part of beam energy loss which is used to estimate the cryogenic losses. In this paper, we compare the beam energy loss induced by 100 mA beam passing through a β=0.09 HWR SRF cavity calculated from time domain solver and frequency domain cavity eigenmodes spectrum method.

Slides THPM8Y01 [0.611 MB]

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THPM9Y01

An Advanced Procedure for Longitudinal Beam Matching for SC CW Heavy Ion Linac With Variable Output Energy

linac, ion, emittance, acceleration

571

S. Yaramyshev, W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu
GSI, Darmstadt, Germany
K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, S. Yaramyshev
MEPhI, Moscow, Russia
M. Heilmann
IAP, Frankfurt am Main, Germany

A multi-stage programm for the developmnet of a heavy ion superconducting (SC) continuous wave (CW) linac is in progress at HIM (Mainz, Germany), GSI (Darmstadt, Germany) and IAP (Frankfurt, Germany). The main beam acceleration is provided by up to nine multi-gap CH cavities. Due to variable beam energy, which coud be provided by each cavity separate, a longitudinal beam matching to each cavity is extremely important. The linac should provide the beam for physics experiments, smothly varying the output particle energy from 3.5 to 7.3 MeV/u, simultaneously keeping high beam quality. A dedicated algorythm for such a complicate matching, providing for the optimum machine settings (voltage and rf phase for each cavity), has been developed. The description of method and the obtained reasuts are discussed in this paper.

Slides THPM9Y01 [1.585 MB]

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