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A 3.0mev Komac/KTF RFQ Linac  [PDF]
J. M. Han
Physics , 2000,
Abstract: The Radio-Frequency Quadrupole (RFQ) linac that will accelerate a 20mA proton beam from 50keV to 3MeV has been designed and is being fabricated as the first phase, KOMAC Test Facility (KTF), of the Korea Multipurpose Accelerator Complex (KOMAC) project at the Korea Atomic Energy Research Institute (KAERI). The physical, engineering designs and fabrication status of the RFQ are described.
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.
Design and Optimization of Low Energy Beam Transport for TAC Proton Facility  [PDF]
H. F. Kisoglu,A. Caliskan,S. Sultansoy,M. Yilmaz
Physics , 2014,
Abstract: In this study, a low energy beam transport (LEBT) channel for the proton linac section of the Turkish Accelerator Center (TAC) has been designed by using TRAVEL code. Commonly used LEBT including two focusing solenoid magnets will transport and match the H- beam from a volume source to RFQ. In the beam dynamics simulations of such a LEBT line, 95% space-charge compensation (SCC) has been considered in this study. We aimed to find out the determination of our RFQ input parameters that gives the best possible beam quality at the entrance of the RFQ using beam collimator in the LEBT line as an alternative way. In this way, we have acquired the best possible beam quality on RFQ input plane as well as optimizing the LEBT line.
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 Energy Stabilization of the Kek 40mev Proton Linac  [PDF]
Z. Igarashi,K. Nanmo,T. Takenaka,E. Takasaki
Physics , 2000,
Abstract: The new method to stabilize the beam energy of the KEK 40MeV proton linac, is developed now. In this method, the signal of the velocity monitor installed upstream the debuncher in the 40MeV beam line, is processed and then fed to the phase shifter of the debuncher rf system so as to cancel the fluctuation of the beam energy. In this article, the beam tests to prove the validity of this method and the system are described.
Asynchronous accelerator with RFQ injection for active longitudinal compression of accelerated bunches  [PDF]
A. R. Tumanyan,Yu. L. Martirosyan,V. C. Nikhogosyan,N. Z. Akopov,Z. G. Guiragossian,R. M Martirosov,Z. N. Akopov
Physics , 2000,
Abstract: An asynchronous accelerator is described, in which the principle of its operation permits the active longitudinal bunch compression of accelerated proton beams, to overcome the space charge limitation effects of intense bunches. It is shown that accelerated bunches from an RFQ linac can be adapted for Asynchronac injection for a multiple of choices in the acceleration frequencies of the RFQ and the Asynchronac. The offered new type of accelerator system is especially suitable to accelerate proton beams for up to 100MeV energy and hundreds of mA average current.
Design of a 10 MeV normal conducting CW proton linac based on equidistant multi-gap CH cavities  [PDF]
Zhihui Li
Physics , 2014, DOI: 10.1088/1674-1137/39/9/097001
Abstract: The continue wave (CW) high current proton linac has wide applications as the front end of the high power proton machines. The low energy part is the most difficult one and there is no widely accepted solution yet. Based on the analysis of the focusing properties of the CW low energy proton linac, a 10 MeV low energy normal conducting proton linac based on equidistant seven-gap Cross-bar H-type (CH) cavities is proposed. The linac is composed of ten 7-gap CH cavities and the transverse focusing is maintained by the quadrupole doublets located between cavities. The total length of the linac is less than 6 meters and the average acceleration gradient is about 1.2 MeV/m. The electromagnetic properties of the cavities are investigated by Microwave Studio. At the nominal acceleration gradient the maximum surface electric field in the cavities is less than 1.3 times Kilpatrick limit, and the Ohmic loss of each cavity is less than 35 kW. The multi-particle beam dynamics simulations are performed with the help of the Tracewin code, the results show that the beam dynamics of the linac is quite stable, and the linac has the capability to accelerate up to 30 mA beam with acceptable dynamics behavior.
Design of the 7 MeV/u, 217 MHz Injector Linac for the Proposed Ion Beam Facility for Cancer Therapy at the Clinic in Heidelberg  [PDF]
B. Schlitt,A. Bechtold,U. Ratzinger,A. Schempp
Physics , 2000,
Abstract: A dedicated clinical synchrotron facility for cancer therapy using energetic proton and ion beams (C, He and O) has been designed at GSI for the Radiologische Universitaetsklinik at Heidelberg, Germany. The design of the injector linac is presented. Suitable ion sources are discussed and results of ion source test measurements are reported. The LEBT allows for switching between two ion sources. A short RFQ accelerates the ions from 8 keV/u to 400 keV/u. It is followed by a very compact beam matching section and a 3.8 m long IH-type drift tube linac for the acceleration to 7 MeV/u. Both rf structures are designed for a resonance frequency of 216.816 MHz and for ion mass-to-charge ratios up to A/q = 3 (12C4+, (H_3)+, 3He+, 16O6+).
An 800-MeV superconducting LINAC to support megawatt proton operations at Fermilab  [PDF]
Paul Derwent,Steve Holmes,Valeri Lebedev
Physics , 2015,
Abstract: Active discussion on the high energy physics priorities in the US carried out since summer of 2013 resulted in changes in Fermilab plans for future development of the existing accelerator complex. In particular, the scope of Project X was reduced to the support of the Long Base Neutrino Facility (LBNF) at the project first stage. The name of the facility was changed to the PIP-II (Proton Improvement Plan). This new facility is a logical extension of the existing Proton Improvement Plan aimed at doubling average power of the Fermilab's Booster and Main Injector (MI). Its design and required R&D are closely related to the Project X. The paper discusses the goals of this new facility and changes to the Project X linac introduced to support the goals.
A CW superconducting linac as the proton driver for a medium baseline neutrino beam in China  [PDF]
Zhihui Li,Jingyu Tang
Physics , 2013, DOI: 10.1088/1674-1137/38/12/127001
Abstract: In a long-term planning for neutrino experiments in China, a medium baseline neutrino beam is proposed which uses a CW superconducting linac of 15 MW in beam power as the proton driver. The linac will be based on the technologies which are under development by the China-ADS project, but with much weaker requirement on reliability. It is composed of a 3.2-MeV normal conducting RFQ and 5 different types of superconducting cavities. The nominal design energy and current are 1.5 GeV and 10 mA, respectively. The general considerations and preliminary results on the physics design will be presented here. In addition, the alternative designs such as 2.0 GeV and 2.5 GeV as they may be required by the general design can be easily extended from the nominal one.
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