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Development of the Low Energy Accelerator for Komac  [PDF]
B. H. Choi
Physics , 2000,
Abstract: KAERI (Korea Atomic Energy Research Institute) has been performing the project named KOMAC (Korea Multi-purpose Accelerator Complex) within the frame work of national mid and long term nuclear research plan. The final objectives of KOMAC is to build a 20-MW (1 GeV and 20 mA) cw (100% duty factor) proton linear accelerator. As the first stage, the low energy accelerator up to 20 MeV is being developed in KTF (KOMAC Test Facility). The low energy accelerator consists of an injector, RFQ, CCDTL, and RF systems. The proton injector with Duoplasmatron ion source has been developed, and the LEBT with solenoid lens is under development. The RFQ linac that will accelerate a 20mA proton beam from 50keV to 3MeV has been designed and is being fabricated. The RF system for RFQ is being developed, and the CCDTL up to 20MeV is being designed. The status of the low energy accelerator will be presented.
Particle-In-Cell Simulation of RFQ in SSC - Linac  [PDF]
Xiao Chen,He Yuan,Yuan You-Jin,Liu Yong,Xia Jia-Wen,Lu Yuan-Rong,Yuri Batygin
Physics , 2010,
Abstract: A 52MHz Radio Frequency Quadrupole (RFQ) linear accelerator (linac) is designed to serve as an initial structure for the SSC-linac system (injector into Separated Sector Cyclotron). The designed injection and output energy are 3.5 keV/u and 143 keV/u, respectively. Beam dynamics study in RFQ was done using 3-dimensional particle-in-cell code BEAMPATH [1]. Simulation results show that this RFQ structure is characterized by stable value of beam transmission efficiency (at least 95%) for both zero-current mode and for space charge dominated regime. The beam accelerated in RFQ has good quality in both transversal and longitudinal directions, and could be easily accepted by Drift Tube Linac (DTL). Effects of vane errors and of the space charge on beam parameters are studied as well to define the engineering tolerance for RFQ vane machining and alignment.
Multi- Physics analysis of the RFQ for the Injector Scheme II of CADS Driver Linac  [PDF]
Wang Jing,Huang Jian-Long,He Yuan,Zhang Xiao-Qi
Physics , 2013,
Abstract: A 162.5 MHz, 2.1 MeV Radio Frequency Quadruples (RFQ) structure is being designed for the Injector Scheme II of China Accelerator Driver System (CADS) driver linac. The RFQ will operate at continuous wave (CW) mode as required. For the CW normal conducting machine, the heat management will be one of the most important issues, since the temperature fluctuation may cause cavity deformation and leading to the resonant frequency shift. Therefor a detailed multi-physics analysis is necessary to ensure that the cavity can be stably worked at the required power level. The multi-physics analysis process includes RF Electromagnetic analysis, Thermal analysis, Mechnical analysis, and this process will be iterated for several cycles until the satisfied solution can be found. As one of the widely accepted measures, the cooling water system is used for frequency fine tunning, so the tunning capability of the cooling water system is also studied at different conditions. The results indicate that with the cooling water system, both the temperature rise and the frequency shift can be controlled in an acceptable level.
Instrumentation Developments and Beam Studies for the Fermilab Proton Improvement Plan LINAC Upgrade and New RFQ Front-End  [PDF]
Victor E. Scarpine,Cheng-Yang Tan,Pat R. Karns,Daniel S. Bollinger,Kevin L. Duel,Nathan Eddy,Ning Lui,Alexei Semenov,Raymond E. Tomlin,William A. Pellico
Physics , 2014,
Abstract: Fermilab is developing a Proton Improvement Plan (PIP) to increase throughput of its proton source. The plan addresses hardware modifications to increase repetition rate and improve beam loss while ensuring viable operation of the proton source through 2025. The first phase of the PIP will enable the Fermilab proton source to deliver 1.8e17 protons per hour by mid-2013. As part of this initial upgrade, Fermilab plans to install a new front-end consisting of dual H- ion sources and a 201 MHz pulsed RFQ. This paper will present beam studies measurements of this new front-end and discuss new beam instrumentation upgrades for the Fermilab linac.
Beam Dynamics Design and Electromagnetic Analysis of 3 MeV RFQ for TAC Proton Linac  [PDF]
H. F. Kisoglu,A. Caliskan,M. Yilmaz
Physics , 2014, DOI: 10.13538/j.1001-8042/nst.26.030103
Abstract: A beam dynamics design of 352.2 MHz Radio-Frequency Quadrupole (RFQ) of Turkish Accelerator Center (TAC) project which accelerates continuous wave (CW) proton beam with 30 mA current from 50 keV to 3 MeV kinetic energy has been performed in this study. Also, it includes error analysis of the RFQ in which some fluctuations have been introduced to input beam parameters to see how the output beam parameters are affected, two-dimensional (2-D) and three-dimensional (3-D) electromagnetic structural design of the RFQ to obtain optimum cavity paramaters that agree with the ones of the beam dynamics. The beam dynamics and error analysis of the RFQ have been done by using LIDOS.RFQ. Electromagnetic design parameters have been obtained by using SUPERFISH for 2-D cavity geometry and CST Microwave Studio for 3-D cavity geometry.
Comparisons Between Modeling and Measured Performance of the BNL Linac  [PDF]
D. Raparia,J. G. Alessi,A. Kponou
Physics , 1996,
Abstract: Quite good agreement has been achieved between computer modeling and actual performance of the Brookhaven 200 MeV Linac. We will present comparisons between calculated and measured performance for the beam transport through the RFQ, the 6 meter transport from RFQ to the linac and meching and transport through the linac.
Commissioning of Ih-RFQ and Ih-DTL for the Gsi High Current Linac  [PDF]
W. Barth,P. Forck,J. Glatz,W. Gutowski,G. Hutter,J. Klabunde,R. Schwedhelm,P. Strehl,W. Vinzenz,D. Wilms,U. Ratzinger
Physics , 2000,
Abstract: The new 1.4 MeV/u front end HSI (HochStromInjektor) of the Unilac accelerates ions with A/q ratios of up to 65 and with beam intensities in emA of up to 0.25 A/q. The maximum beam pulse power is up to 1300 kW. During the stepwise linac commissioning from April to Septem-ber 1999 the beam behind of each cavity was analysed within two weeks. A very stable Ar1+ beam out of a vol-ume plasma source MUCIS was used mainly. The meas-ured norm. 80 % emittance areas around 0.45 pi mm mrad are close to the results from beam simulations. Up to 80 % of the design intensity at the linac exit were achieved. In February 2000 an U4+ beam from the MEVVA source was accelerated for the first time.
RFQ Parameter Choice by Multi-Parameter Optimization  [PDF]
Boris I. Bondarev,Alexander P. Durkin
Physics , 2000,
Abstract: Experts in different accelerator laboratories accumulated wide experience in RFQ designing. Nevertheless new tasks on high-power, high-energy CW linac designing (for example, for ADT applications) were appeared recently. Such accelerators must be practically free of beam losses. This main condition placed more stringent requirements upon beam quality at the input of each linac part. Because RFQ is used as beginning part in above accelerators beam high-quality requirements is related to RFQ primarily. It means that existing experience in RFQ designing must be enriching by new approaches and new methodology
Funneling with the Two-Beam RFQ  [PDF]
H. Zimmermann
Physics , 2000,
Abstract: New high current accelerator facilities like proposed for HIDIF or ESS require a beam with a high brilliance. These beams can not be produced by a single pass rf-linac. The increase in brightness in such a driver linac is done by several funneling stages at low energies, in which two identically bunched ion beams are combined into a single beam with twice the frequency current and brightness. Our Two-Beam-RFQ funneling experiment is a setup of two ion sources, a two beam RFQ, a funnel deflector and beam diagnostic equipment to demonstrate funneling of ion beams as a model for the first funneling stage of a HIIF driver. The progress of the funneling experiment and results of simulations will be presented.
Status Report on the 5 Mev Iphi RFQ  [PDF]
R. Ferdinand,P-Y. Beauvais,R. Duperrier,A. France,J. Gaiffier,J-M. Lagniel,M. Painchault,F. Simoens,CEA-Saclay,DSM-DAPNIA-SEA,P. Balleyguier,CEA-Bruyeres le Chatel,DAM
Physics , 2000,
Abstract: A 5-MeV RFQ designed for a proton current up to 100-mA CW is now under construction as part of the High Intensity Proton Injector project (IPHI). Its computed transmission is greater than 99 %. The main goals of the project are to verify the accuracy of the design codes, to gain the know-how on fabrication, tuning procedures and operations, to measure the output beam characteristics in order to optimise the higher energy part of the linac, and to reach a high availability with minimum beam trips. A cold model has been built to develop the tuning procedure. The present status of the IPHI RFQ is presented.
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