HB2016 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
MOPM4P01	Challenges and Performance of the C-ADS Injector System	linac, proton, cavity, 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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MOPR017	Status of the Beam Instrumentation System of CSNS	DTL, neutron, linac, emittance	95
	J.L. Sun, J. Peng, R.Y. Qiu, T. Yang CSNS, Guangdong Province, People's Republic of China W.L. Huang, F. Li, P. Li, M. Meng, J.M. Tian, T.G. Xu, Zh.H. Xu, L. Zeng IHEP, Beijing, People's Republic of China
	The first section DTL commissioning of China Spallation Neutron Source (CSNS) project has been successful finished in January, 2016. The H⁻ beam can be accelerated to 21.6 MeV at peak current 18 mA, achieved the design point. Different elements of the beam instrumentation system have been tested during the commissioning, including BPM, CT, FCT, WS, EM, BLM, and corresponding electronics and control systems. High accuracy phase measurement (precision @ ±1°) system has been started into operation. Beam loss monitor (BLM) for low energy, 3 MeV to 21.6 MeV, has been tested too, and got very positive results. For the LRBT, RCS and RTBT, different type wire scanner, BPM, WCM, CT were designed. The monitors fit for the high-radiation environments were considered. All the physical design work has been finished, and being manufactured. Lab test will be started in June and the LINAC commissioning (beam energy up to 80 MeV) will be started in August.
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MOPL004	Beam Dynamics Simulations and Code Comparison for a New CW RFQ Design	linac, simulation, space-charge, focusing	188
	S.M. Polozov, W.A. Barth, T. Kulevoy, S. Yaramyshev MEPhI, Moscow, Russia W.A. Barth, S. Yaramyshev GSI, Darmstadt, Germany W.A. Barth HIM, Mainz, Germany T. Kulevoy ITEP, Moscow, Russia
	Research and development of CW applications is an important step in RFQ design. The RF potential should be limited by 1.3-1.5 of Kilpatrick criterion for the CW mode. A 2 MeV RFQ is under development for the compact CW research proton accelerator, as well as for planned driver linac* in Russia. The maximum beam current is fixed to10 mA; the operating frequency has been set to 162 MHz. The new RFQ linac design will be presented and beam dynamics simulation results will be discussed. Calculations of beam dynamics are provided using the codes BEAMDULAC (developed at MEPhI for linac design) and DYNAMION. A comparison of the software performance is presented. * A.Y. Aksentyev, T.V. Kulevoy, S.M. Polozov. Proc. of IPAC’14, pp. 3286-3288.
	Poster MOPL004 [2.609 MB]
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MOPL005	The Simulation Study of Beam Dynamics for CSNS Linac During Beam Commissioning	emittance, DTL, simulation, linac	192
	Y. Yuan, H.F. Ji, S. Wang IHEP, Beijing, People's Republic of China J. Peng CSNS, Guangdong Province, People's Republic of China
	China Spallation Neutron Source (CSNS) is a high intensity accelerator based facility. Its accelerator consists of an H⁻ injector and a proton Rapid Cycling Synchrotron. The injector includes the front end and linac. The RFQ accelerates the beam to 3MeV, and then the Drift Tube Linac (DTL) accelerates it to 80MeV[1]. An Medium Energy Beam Transport (MEBT) matches RFQ and DTL, and the DTL consists of four tanks. Commissioning of the MEBT and the first DTL tank (DTL1) have been accomplished in the last run. Due to the difference of actual effective length and theoretical effective length of magnets in MEBT and DTL1, in order to compare its impact of beam transport, this paper takes a beam dynamics simulation on beam transport in MEBT and DTL1 with IMPACT-Z code[2]. Meanwhile, the transport of beam with different emittance in MEBT and DTL1 is studied because of the large emittance at RFQ exit. All the simulation includes magnet error and RF error.
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MOPL006	Beam Dynamics Study of C-Ads Injector-I With Developing P-Topo Code	simulation, space-charge, emittance, lattice	195
	Zh.C. Liu, C. Li, Q. Qin, F. Yan, Y.L. Zhao IHEP, Beijing, People's Republic of China
	A parallelized, time-dependent 3D particle simulation code is under developing to study the high-intensity beam dynamics in linear accelerators. The self-consistent space charge effect is taken into account with the Particle-In-Cell (PIC) method. In this paper, the structure of program and the parallel strategy are demonstrated. Then, we show the results of code verification and benchmarking. It is proved that the solvers in P-TOPO code and parallel strategy are reliable and efficient. Finally, the beam dynamics simulation of C-ADS Injector-I at IHEP are launched with P-TOPO and other codes. The possible reasons for the differences between results given by separated codes are also proposed.
	Poster MOPL006 [2.169 MB]
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MOPL017	High Power and High Duty Cycle Slit and Grid System for Hadron Accelerator Commissioning	emittance, simulation, scattering, DTL	226
	B. Cheymol, A. Ponton ESS, Lund, Sweden
	Transverse emittance is one of the key measurements to be performed during the commissioning of the low energy sections of an hadron linac. The good knowledge of the beam transverse phase space allows a safe and efficient operation of the machines by using the results of the measurement for beam dynamic simulations. In this paper we will discuss the accuracy and the limits of the transverse emittance measurement performed with the slit-grid method based on the ESS beam parameters at the RFQ (beam energy equal to 3.62 MeV) and DTL tank 1 (beam energy equal to 21 MeV) output.
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TUAM3Y01	Beam Dynamics Challenges in the ESS Linac	linac, lattice, cryomodule, DTL	315
	Y.I. Levinsen, R. De Prisco, M. Eshraqi, R. Miyamoto, M. Muñoz, A. Ponton ESS, Lund, Sweden
	The European Spallation Source will be the worlds brightest neutron source. It will be driven by a 5~MW proton linac that delivers a 2.86~ms pulse at 14~Hz, which means the peak beam power is 125~MW. This requires a careful design of the lattice structures in order to allow for safe and reliable operation of the accelerator. We will discuss some of the design choices and some of the particular challenges that were faced during the design of the ESS lattice.
	Slides TUAM3Y01 [4.203 MB]
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TUPM1Y01	Advances in the Development of the ESS-Bilbao Proton Injector	solenoid, ion, plasma, ion-source	323
	Z. Izaola, I. Bustinduy, J. Corres, G. Harper, R. Miracoli, J.L. Muñoz, I. Rueda, A. Vizcaino, A. Zugazaga, D. de Cos, C. de la Cruz ESS Bilbao, Zamudio, Spain
	We present the last advances in the operation and construction of the ESS-Bilbao 3 MeV proton beam injector. The proton ECR source allows to change the distance between the plasma chamber and the first extraction electrode, acceleration gap. The beam has been characterised at different acceleration gaps by current transformers, wire scanners and photographs of 2d profiles. In addition, we present the status of the construction of the RFQ; which is at its beginning.
	Slides TUPM1Y01 [11.753 MB]
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TUPM2Y01	Beam Commissioning Results for the CSNS MEBT and DTL-1	DTL, emittance, linac, cavity	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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TUPM4Y01	IFMIF-EVEDA RFQ, Measurement of Beam Input Conditions and Preparation to Beam Commissioning	emittance, simulation, solenoid, space-charge	338
	M. Comunian, L. Bellan, E. Fagotti, A. Pisent INFN/LNL, Legnaro (PD), Italy L. Bellan Univ. degli Studi di Padova, Padova, Italy
	The commissioning phase of the IFMIF-EVEDA RFQ requires a complete beam characterization with simulations and measurements of the beam input from the IFMIF-EVEDA ion source and LEBT, in order to reach the RFQ input beam parameters. In this article the simulations of source LEBT RFQ will be reported with the corresponding set of measurements done on the Ion source and LEBT.
	Slides TUPM4Y01 [7.230 MB]
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TUPM5Y01	ESS Linac Plans for Commissioning and Initial Operations	linac, target, quadrupole, dipole	342
	R. Miyamoto, M. Eshraqi, M. Muñoz ESS, Lund, Sweden
	Beam commissioning of the proton linac of the European Spallation Source (ESS) is planned to be conducted in 2018 and 2019. At this stage, the last 21 cryomodules are not yet installed and the maximum beam energy and power are 570 MeV and 1.4 MW, with respect to the nominal 2 GeV and 5 MW. The linac will be operated in this condition until the remaining cyromodules are installed in two stages in 2021 and 2022. On top of the common challenges of beam dynamics and machine protection, commissioning of a large scale machine, such as the ESS linac within a relatively short integrated time of less than 40 weeks imposes an additional challenge to the scheduling and planning. This paper lays out the current plans of the ESS linac for its beam commissioning as well as the initial operation.
	Slides TUPM5Y01 [3.651 MB]
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TUPM6Y01	Commissioning of C-ADS Injector I	cavity, 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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WEAM1Y01	A Coupled RFQ-IH-DTL Cavity for FRANZ: A Challenge for RF Technology and Beam Dynamics	DTL, cavity, 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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WEAM3Y01	Present Status of the High Current Linac at Tsinghua University and Its Application	proton, neutron, target, linac	413
	Q.Z. Xing, D.T. Bin, C. Cheng, C.T. Du, L. Du, T.B. Du, X. Guan, Q.K. Guo, H. Jiang, C.-X. Tang, R. Tang, D. Wang, X.W. Wang, L. Wu, H.Y. Zhang, Q.Z. Zhang, S.X. Zheng TUB, Beijing, People's Republic of China W.Q. Guan, Y. He, J. Li NUCTECH, Beijing, People's Republic of China
	The CPHS (Compact Pulsed Hadron Source) linac at Tsinghua University, is now in operation as an achievement of its mid-term objective. Presently the RFQ accelerator is operated stably with the beam energy of 3 MeV, peak current of 26 mA, pulse length of 100 μs and repetition rate of 20 Hz. After the maintenance period the transmission rate of the RFQ accelerator has been recovered from 65% to 91%. The application of the proton and neutron beam is introduced in this paper.
	Slides WEAM3Y01 [8.616 MB]
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WEPM5Y01	H⁻ Beam Dynamics Study of a LEBT in XiPAF Project with the WARP PIC Code	simulation, space-charge, ion, proton	449
	R. Ruo, L. Du, T.B. Du, X. Guan, C.-X. Tang, X.W. Wang, Q.Z. Xing, H.Y. Zhang, Q.Z. Zhang TUB, Beijing, People's Republic of China Y. He, J. Li NUCTECH, Beijing, People's Republic of China
	The 7 MeV H⁻ linac injector of Xi‘an Proton Application Facility (XiPAF) is composed of an ECR ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole accelerator (RFQ) and a Drift Tube Linac (DTL). The 1.7 m-long LEBT is used for matching a 40 μs pulse width 6 mA peak current beam to the entrance of the RFQ accelerator. The peak current and pulse-width of the 50 keV H⁻ beam extracted from the ion source is 10 mA and 1 ms respectively. In the LEBT, an adjustable aperture is used for scraping the peak current of the beam to 6 mA, and an electric chopper is used for chopping the beam pulse width to 40 μs. These elements make the space charge compensation problem more complicated. A careful simulation of the space charge compensation problem of the H⁻ beam has been done by considering the beam particles interacting with the residual gas with the help of WARP PIC code. To achieve the requirements of the LEBT in XiPAF, the type and pressure of the residual gas is given according to the simulation results.
	Slides WEPM5Y01 [5.926 MB]
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THAM1Y01	Beam Commissioning of C-ADS Linac Instrumentation	linac, emittance, instrumentation, cavity	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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THPM5Y01	Design and Beam Dynamics Studies of a Multi-Ion Linac Injector for the JLEIC Ion Complex	ion, linac, light-ion, DTL	559
	P.N. Ostroumov, Z.A. Conway, B. Mustapha, A.S. Plastun ANL, Argonne, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. The electron-ion collider being developed at JLAB requires a new ion accelerator complex which includes a linac capable of delivering any ion beam from hydrogen to lead to the booster. We are currently developing a linac which consists of several ion sources, a normal conducting (NC) front end, up to 5 MeV/u, and a SC section for energies > 5 MeV/u. The development work is focused on beam dynamics and electrodynamics studies to design efficient and cost-effective accelerating structures for both the NC and SC sections of the linac. Currently we are considering two RFQs following either heavy-ion sources or light-ion sources including polarized beams, and several different types of NC accelerating structures downstream of the RFQ. Quarter-wave and half-wave resonators can be effectively used in the SC section.
	Slides THPM5Y01 [2.108 MB]
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THPM7Y01	A New RFQ Model and Symplectic Multi-Particle Tracking in the IMPACT Code Suite	space-charge, simulation, proton, emittance	562
	J. Qiang LBNL, Berkeley, California, USA L. Li, Z. Wang PKU, Beijing, People's Republic of China
	The IMPACT code suite is a self-consistent parallel three-dimensional beam dynamics simulation toolbox that combines the magnetic optics method and the parallel particle-in-cell method. It has been widely used to study high intensity/high brightness beams in many accelerators. In this paper, we will report on recent improvements to the code such as the capability to model RFQ in time domain and symplectic multi-particle tracking with a gridless spectral solver for space-charge simulation.
	Slides THPM7Y01 [8.794 MB]
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Paper

Title

Other Keywords

Page

MOPM4P01

Challenges and Performance of the C-ADS Injector System

linac, proton, cavity, 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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MOPR017

Status of the Beam Instrumentation System of CSNS

DTL, neutron, linac, emittance

95

J.L. Sun, J. Peng, R.Y. Qiu, T. Yang
CSNS, Guangdong Province, People's Republic of China
W.L. Huang, F. Li, P. Li, M. Meng, J.M. Tian, T.G. Xu, Zh.H. Xu, L. Zeng
IHEP, Beijing, People's Republic of China

The first section DTL commissioning of China Spallation Neutron Source (CSNS) project has been successful finished in January, 2016. The H⁻ beam can be accelerated to 21.6 MeV at peak current 18 mA, achieved the design point. Different elements of the beam instrumentation system have been tested during the commissioning, including BPM, CT, FCT, WS, EM, BLM, and corresponding electronics and control systems. High accuracy phase measurement (precision @ ±1°) system has been started into operation. Beam loss monitor (BLM) for low energy, 3 MeV to 21.6 MeV, has been tested too, and got very positive results. For the LRBT, RCS and RTBT, different type wire scanner, BPM, WCM, CT were designed. The monitors fit for the high-radiation environments were considered. All the physical design work has been finished, and being manufactured. Lab test will be started in June and the LINAC commissioning (beam energy up to 80 MeV) will be started in August.

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MOPL004

Beam Dynamics Simulations and Code Comparison for a New CW RFQ Design

linac, simulation, space-charge, focusing

188

S.M. Polozov, W.A. Barth, T. Kulevoy, S. Yaramyshev
MEPhI, Moscow, Russia
W.A. Barth, S. Yaramyshev
GSI, Darmstadt, Germany
W.A. Barth
HIM, Mainz, Germany
T. Kulevoy
ITEP, Moscow, Russia

Research and development of CW applications is an important step in RFQ design. The RF potential should be limited by 1.3-1.5 of Kilpatrick criterion for the CW mode. A 2 MeV RFQ is under development for the compact CW research proton accelerator, as well as for planned driver linac* in Russia. The maximum beam current is fixed to10 mA; the operating frequency has been set to 162 MHz. The new RFQ linac design will be presented and beam dynamics simulation results will be discussed. Calculations of beam dynamics are provided using the codes BEAMDULAC (developed at MEPhI for linac design) and DYNAMION. A comparison of the software performance is presented.
* A.Y. Aksentyev, T.V. Kulevoy, S.M. Polozov. Proc. of IPAC’14, pp. 3286-3288.

Poster MOPL004 [2.609 MB]

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MOPL005

The Simulation Study of Beam Dynamics for CSNS Linac During Beam Commissioning

emittance, DTL, simulation, linac

192

Y. Yuan, H.F. Ji, S. Wang
IHEP, Beijing, People's Republic of China
J. Peng
CSNS, Guangdong Province, People's Republic of China

China Spallation Neutron Source (CSNS) is a high intensity accelerator based facility. Its accelerator consists of an H⁻ injector and a proton Rapid Cycling Synchrotron. The injector includes the front end and linac. The RFQ accelerates the beam to 3MeV, and then the Drift Tube Linac (DTL) accelerates it to 80MeV[1]. An Medium Energy Beam Transport (MEBT) matches RFQ and DTL, and the DTL consists of four tanks. Commissioning of the MEBT and the first DTL tank (DTL1) have been accomplished in the last run. Due to the difference of actual effective length and theoretical effective length of magnets in MEBT and DTL1, in order to compare its impact of beam transport, this paper takes a beam dynamics simulation on beam transport in MEBT and DTL1 with IMPACT-Z code[2]. Meanwhile, the transport of beam with different emittance in MEBT and DTL1 is studied because of the large emittance at RFQ exit. All the simulation includes magnet error and RF error.

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MOPL006

Beam Dynamics Study of C-Ads Injector-I With Developing P-Topo Code

simulation, space-charge, emittance, lattice

195

Zh.C. Liu, C. Li, Q. Qin, F. Yan, Y.L. Zhao
IHEP, Beijing, People's Republic of China

A parallelized, time-dependent 3D particle simulation code is under developing to study the high-intensity beam dynamics in linear accelerators. The self-consistent space charge effect is taken into account with the Particle-In-Cell (PIC) method. In this paper, the structure of program and the parallel strategy are demonstrated. Then, we show the results of code verification and benchmarking. It is proved that the solvers in P-TOPO code and parallel strategy are reliable and efficient. Finally, the beam dynamics simulation of C-ADS Injector-I at IHEP are launched with P-TOPO and other codes. The possible reasons for the differences between results given by separated codes are also proposed.

Poster MOPL006 [2.169 MB]

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MOPL017

High Power and High Duty Cycle Slit and Grid System for Hadron Accelerator Commissioning

emittance, simulation, scattering, DTL

226

B. Cheymol, A. Ponton
ESS, Lund, Sweden

Transverse emittance is one of the key measurements to be performed during the commissioning of the low energy sections of an hadron linac. The good knowledge of the beam transverse phase space allows a safe and efficient operation of the machines by using the results of the measurement for beam dynamic simulations. In this paper we will discuss the accuracy and the limits of the transverse emittance measurement performed with the slit-grid method based on the ESS beam parameters at the RFQ (beam energy equal to 3.62 MeV) and DTL tank 1 (beam energy equal to 21 MeV) output.

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TUAM3Y01

Beam Dynamics Challenges in the ESS Linac

linac, lattice, cryomodule, DTL

315

Y.I. Levinsen, R. De Prisco, M. Eshraqi, R. Miyamoto, M. Muñoz, A. Ponton
ESS, Lund, Sweden

The European Spallation Source will be the worlds brightest neutron source. It will be driven by a 5~MW proton linac that delivers a 2.86~ms pulse at 14~Hz, which means the peak beam power is 125~MW. This requires a careful design of the lattice structures in order to allow for safe and reliable operation of the accelerator. We will discuss some of the design choices and some of the particular challenges that were faced during the design of the ESS lattice.

Slides TUAM3Y01 [4.203 MB]

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TUPM1Y01

Advances in the Development of the ESS-Bilbao Proton Injector

solenoid, ion, plasma, ion-source

323

Z. Izaola, I. Bustinduy, J. Corres, G. Harper, R. Miracoli, J.L. Muñoz, I. Rueda, A. Vizcaino, A. Zugazaga, D. de Cos, C. de la Cruz
ESS Bilbao, Zamudio, Spain

We present the last advances in the operation and construction of the ESS-Bilbao 3 MeV proton beam injector. The proton ECR source allows to change the distance between the plasma chamber and the first extraction electrode, acceleration gap. The beam has been characterised at different acceleration gaps by current transformers, wire scanners and photographs of 2d profiles. In addition, we present the status of the construction of the RFQ; which is at its beginning.

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TUPM2Y01

Beam Commissioning Results for the CSNS MEBT and DTL-1

DTL, emittance, linac, cavity

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.

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TUPM4Y01

IFMIF-EVEDA RFQ, Measurement of Beam Input Conditions and Preparation to Beam Commissioning

emittance, simulation, solenoid, space-charge

338

M. Comunian, L. Bellan, E. Fagotti, A. Pisent
INFN/LNL, Legnaro (PD), Italy
L. Bellan
Univ. degli Studi di Padova, Padova, Italy

The commissioning phase of the IFMIF-EVEDA RFQ requires a complete beam characterization with simulations and measurements of the beam input from the IFMIF-EVEDA ion source and LEBT, in order to reach the RFQ input beam parameters. In this article the simulations of source LEBT RFQ will be reported with the corresponding set of measurements done on the Ion source and LEBT.

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TUPM5Y01

ESS Linac Plans for Commissioning and Initial Operations

linac, target, quadrupole, dipole

342

R. Miyamoto, M. Eshraqi, M. Muñoz
ESS, Lund, Sweden

Beam commissioning of the proton linac of the European Spallation Source (ESS) is planned to be conducted in 2018 and 2019. At this stage, the last 21 cryomodules are not yet installed and the maximum beam energy and power are 570 MeV and 1.4 MW, with respect to the nominal 2 GeV and 5 MW. The linac will be operated in this condition until the remaining cyromodules are installed in two stages in 2021 and 2022. On top of the common challenges of beam dynamics and machine protection, commissioning of a large scale machine, such as the ESS linac within a relatively short integrated time of less than 40 weeks imposes an additional challenge to the scheduling and planning. This paper lays out the current plans of the ESS linac for its beam commissioning as well as the initial operation.

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TUPM6Y01

Commissioning of C-ADS Injector I

cavity, 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.

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WEAM1Y01

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

DTL, cavity, 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.

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WEAM3Y01

Present Status of the High Current Linac at Tsinghua University and Its Application

proton, neutron, target, linac

413

Q.Z. Xing, D.T. Bin, C. Cheng, C.T. Du, L. Du, T.B. Du, X. Guan, Q.K. Guo, H. Jiang, C.-X. Tang, R. Tang, D. Wang, X.W. Wang, L. Wu, H.Y. Zhang, Q.Z. Zhang, S.X. Zheng
TUB, Beijing, People's Republic of China
W.Q. Guan, Y. He, J. Li
NUCTECH, Beijing, People's Republic of China

The CPHS (Compact Pulsed Hadron Source) linac at Tsinghua University, is now in operation as an achievement of its mid-term objective. Presently the RFQ accelerator is operated stably with the beam energy of 3 MeV, peak current of 26 mA, pulse length of 100 μs and repetition rate of 20 Hz. After the maintenance period the transmission rate of the RFQ accelerator has been recovered from 65% to 91%. The application of the proton and neutron beam is introduced in this paper.

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WEPM5Y01

H⁻ Beam Dynamics Study of a LEBT in XiPAF Project with the WARP PIC Code

simulation, space-charge, ion, proton

449

R. Ruo, L. Du, T.B. Du, X. Guan, C.-X. Tang, X.W. Wang, Q.Z. Xing, H.Y. Zhang, Q.Z. Zhang
TUB, Beijing, People's Republic of China
Y. He, J. Li
NUCTECH, Beijing, People's Republic of China

The 7 MeV H⁻ linac injector of Xi‘an Proton Application Facility (XiPAF) is composed of an ECR ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole accelerator (RFQ) and a Drift Tube Linac (DTL). The 1.7 m-long LEBT is used for matching a 40 μs pulse width 6 mA peak current beam to the entrance of the RFQ accelerator. The peak current and pulse-width of the 50 keV H⁻ beam extracted from the ion source is 10 mA and 1 ms respectively. In the LEBT, an adjustable aperture is used for scraping the peak current of the beam to 6 mA, and an electric chopper is used for chopping the beam pulse width to 40 μs. These elements make the space charge compensation problem more complicated. A careful simulation of the space charge compensation problem of the H⁻ beam has been done by considering the beam particles interacting with the residual gas with the help of WARP PIC code. To achieve the requirements of the LEBT in XiPAF, the type and pressure of the residual gas is given according to the simulation results.

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THAM1Y01

Beam Commissioning of C-ADS Linac Instrumentation

linac, emittance, instrumentation, cavity

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.

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THPM5Y01

Design and Beam Dynamics Studies of a Multi-Ion Linac Injector for the JLEIC Ion Complex

ion, linac, light-ion, DTL

559

P.N. Ostroumov, Z.A. Conway, B. Mustapha, A.S. Plastun
ANL, Argonne, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
The electron-ion collider being developed at JLAB requires a new ion accelerator complex which includes a linac capable of delivering any ion beam from hydrogen to lead to the booster. We are currently developing a linac which consists of several ion sources, a normal conducting (NC) front end, up to 5 MeV/u, and a SC section for energies > 5 MeV/u. The development work is focused on beam dynamics and electrodynamics studies to design efficient and cost-effective accelerating structures for both the NC and SC sections of the linac. Currently we are considering two RFQs following either heavy-ion sources or light-ion sources including polarized beams, and several different types of NC accelerating structures downstream of the RFQ. Quarter-wave and half-wave resonators can be effectively used in the SC section.

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THPM7Y01

A New RFQ Model and Symplectic Multi-Particle Tracking in the IMPACT Code Suite

space-charge, simulation, proton, emittance

562

J. Qiang
LBNL, Berkeley, California, USA
L. Li, Z. Wang
PKU, Beijing, People's Republic of China

The IMPACT code suite is a self-consistent parallel three-dimensional beam dynamics simulation toolbox that combines the magnetic optics method and the parallel particle-in-cell method. It has been widely used to study high intensity/high brightness beams in many accelerators. In this paper, we will report on recent improvements to the code such as the capability to model RFQ in time domain and symplectic multi-particle tracking with a gridless spectral solver for space-charge simulation.

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