Paper | Title | Other Keywords | Page |
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MO3A02 | Commissioning of a New Injector for the RIKEN RI-Beam Factory | DTL, cyclotron, cavity, rfq | 125 |
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A new injector for the RIKEN RI-Beam Factory (RIBF) has been fully commissioned since October 2011. The injector accelerates ions of m/q=6.8 up to 670 keV/u. In order to save the cost and space, a direct coupling scheme was adopted for rf coupling between the cavity and amplifier, based on an elaborate design with the Microwave Studio code. It has worked out very stably in these three months, making the uranium beam intensity higher by one order of magnitude. Moreover, it is now possible to operate the RIBF and GARIS facility for the super-heavy element synthesis independently. | |||
Slides MO3A02 [19.503 MB] | |||
MOPB021 | Bunch-by-bunch Phase Modulation for Linac Beam-loading Compensation | beam-loading, linac, impedance, bunching | 216 |
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Funding: supported by NSFC-CAS Joint Fund, contract no. 11079034 If the linac is loaded by a high current, long pulse multi-bunch beam, the energy of the beam drops with time during the pulse. The bunch phase modulation method is introduced to compensate the beam loading. In this method the beam phase in the RF accelerating filed is changed bunch-by-bunch, the beam energy gain in the RF filed gradually grows up, which cancels the drop due to beam loading. The relationship between the beam phase distribution and the linac parameters is calculated in this paper. |
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MOPB029 | Commissioning of the X-Band Test Area at SLAC | gun, cathode, laser, electron | 234 |
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Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515. The X-Band Test Area (XTA) is being assembled in the NLCTA tunnel at SLAC to serve as a test facility for new X-Band RF guns. The first gun to be tested is an upgraded version of the 5.6 cell, 200 MV/m peak field X-band gun designed at SLAC in 2003 for the Compton Scattering experiment run in ASTA [1]. The XTA beamline is equipped with diagnostics to measure both the longitudinal phase space and the transverse phase space properties of the beam after it has reached 100 MeV. We will review design choices and present some early commissioning results. [1] A.E. Vlieks, et al. “Recent measurements and plans for the SLAC Compton X-ray source”, SLAC-PUB-11689, 2006. 10pp. Published in AIP Conf. Proc.807:481-490, 2006 |
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MOPB035 | The Linear Accelerating Structure Development for HLS Upgrade | cavity, linac, electron, bunching | 252 |
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Hefei Light Source (HLS) is mainly composed of an 800 MeV electron storage ring and a 200 MeV constant-impedance Linac functioning as its injector. A new Linac is developed in view of the Full Energy Injection and the Top-up Injection scheme will be adopted in the HLS upgrade. In this paper, an 800 MeV linear accelerating system construction, the constant-gradient structure design and the symmetry couplers consideration will be described in detail. The manufacture technology, the RF measurement, the high power test results and the accelerating system operation are presented. | |||
MOPB038 | Single Shot Bunch-by-Bunch Beam Emittance Measurement of the SPring-8 Linac | linac, emittance, electron, dipole | 261 |
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Bunch by bunch emittance of a single shot beam from the SPring-8 electron linac was measured. The linac is operated as an injector to the electron storage ring, NewSUBARU. A high beam stability is required for the stable top-up injection into the ring with a small acceptance. We used the electron ring as a part of the measurement system. The electron beam from the linac was injected into the ring and circulated for many turns. The beam profiles were recorded by a dual-sweep streak camera using the visible light in the ring. The fast sweep separated the bunches in 1 ns macro pulse and the slow sweep separated the profiles at different revolutions. It enabled a multi-record of beam profiles in one camera frame. Betatron oscillation in the ring produced the phase space rotation for the reconstruction of the beam emittance. The ring parameters were optimized for the measurement because the beam storage was not necessary. A stability of the linac beam was evaluated from the shot by shot fluctuation of the emittance and the bunch structure. We also compared the emittances of a front bunch and a rear bunch in the same pulse. | |||
TUPB032 | Beam Dynamics of the Linac ALPI-PIAVE in View of Possible Upgrades Scenario for the SPES Project. | rfq, linac, emittance, ion | 546 |
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At the Legnaro National Laboratories it is operating a Super Conducting linac for nuclear studies named ALPI. The ALPI linac is injected either by a XTU tandem, up to 14 MV, or by the s-c PIAVE injector, made with 2 SC-RFQ. In this article will be report the beam dynamics simulations for some possible scenario upgrade of the linac operate by a new injector, made with a new RFQ. | |||
TUPB062 | Longitudinal Dynamic Analysis for the Project X 3-8 GeV Pulsed Linac | cavity, controls, linac, cryomodule | 618 |
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The Pulsed Linac is a will require over 200 9-cell, 1300 MHz cavities packed in 26 ILC type cryomodules to accelerate 1 mA average beam current from 3GeV to 8 GeV. The architecture of the RF must optimize RF power, beam emittance, and energy gain amid a large number of requirement and constraints. The pulse length is a critical issue. Ideally, a 26 ms pulse would allow direct injection into the Fermilab’s Main Injector, bypassing the need of the Fermilab’s Recicler. High loaded quality factors (QL) are also desirable to minimize RF power. These requirements demand an accurate control of the cavity resonant frequency disturbed by Lorentz Force Detuning and microphonics. Also the LLRF control system must regulate the RF amplitude and phase within tight bounds amid a long list of dynamic disturbances. The present work describes the simulation efforts and measurements at Fermilab facilities. | |||
TUPB084 | High Dynamic-Range High Speed Linac Current Measurements | linac, neutron, monitoring, feedback | 666 |
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Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. It is desired to measure the linac current of a charged particle beam with a consistent accuracy over a dynamic range of over 120 dB. Conventional current transformers suffer from droop, can be susceptible to electromagnetic interference (EMI), and can be bandwidth limited. A novel detector and electronics were designed to maximize dynamic range of about 120 dB and measure risetimes on the order of 10 nanoseconds. |
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THPLB04 | Preliminary Study of Proton Beam Transport in a 10 MeV Dielectric Wall Accelerator | proton, focusing, accelerating-gradient, ion | 816 |
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Funding: Nuclear Energy Technology Development project; National Natural Science Foundation of China (11035004) A novel proton accelerator based on Dielectric Wall Accelerator (DWA) technology is being developed at Institute of Fluid Physics (IFP). The accelerating gradient will be 20 MV/m or even higher based on current high gradient insulator (HIG) performance. Theoretical study and numerical simulation of accelerating the proton beam to 10 MeV by virtual traveling wave method is presented in this paper. The beam dynamics under accelerating pulse with or without flattop is discussed. |
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Slides THPLB04 [1.191 MB] | |||
THPB002 | Preliminary Study of Proton Beam Transport in a 10 MeV Dielectric Wall Accelerator | proton, focusing, accelerating-gradient, ion | 840 |
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Funding: Nuclear Energy Technology Development project; National Natural Science Foundation of China (11035004) A novel proton accelerator based on Dielectric Wall Accelerator (DWA) technology is being developed at Institute of Fluid Physics (IFP). The accelerating gradient will be 20 MV/m or even higher based on current high gradient insulator (HIG) performance. Theoretical study and numerical simulation of accelerating the proton beam to 10 MeV by virtual traveling wave method is presented in this paper. The beam dynamics under accelerating pulse with or without flattop is discussed. |
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THPB010 | Progress in the Construction of Linac4 at CERN | linac, rfq, klystron, DTL | 864 |
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As first step of the LHC luminosity upgrade program CERN is building a new 160 MeV H¯ linear accelerator, Linac4, to replace the ageing 50 MeV Linac2 as injector to the PS Booster (PSB). Linac4 is an 86-m long normal-conducting linac made of a 3 MeV injector followed by 22 accelerating cavities of three different types. The general service infrastructure has been installed in the new tunnel and surface building and its commissioning is progressing; high power RF equipment is being installed in the hall and installations in the tunnel will start soon. Construction of the accelerator parts is in full swing involving industry, the CERN workshops and a network of international collaborations. The injector section including a newly designed and built H¯ source, a 3-m long RFQ and a chopping line is being commissioned in a dedicated test stand. Beam commissioning of the linac will take place in steps of increasing energy between 2013 and 2014. From end of 2014 Linac4 could deliver 50 MeV protons in case of Linac2 failure, while 160 MeV H¯ could be injected into the PSB from end of 2015; the exact start of the LHC shut-down required for connection will be coordinated with its experiments. | |||
THPB017 | A Concept: 8GeV CW Linac, Staged Approach | linac, booster, rfq, proton | 885 |
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This note describes a concept of CW Proton Linac on the Fermilab site. With exception of RFQ the linac is based on superconducting technology. Based on the output, energy is segmented in three parts, 1GeV, 3GeV and 8GeV. It is located near existing Fermilab Proton Source with the intention that each section of the linac can be used as soon as it is commissioned. The whole design is based on the designs suggested for the Proton Driver and ProjectX. The suggested site and linac segmentation allows for the construction to start immediately. Additional benefits come from the fact that the present linac (the oldest machine in Fermilab complex) is replaced and existing Proton Source’s functionality is preserved for the future. | |||
THPB037 | Iron Beam Acceleration with DPIS | rfq, plasma, ion, laser | 936 |
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Funding: The work supported by US. DOE and RIKEN Japan. It has been proved that direct plasma Injection Scheme (DPIS) is an efficient way to accelerate high current highly charged state heavy ion beam. More than 50 mA (peak current) of various heavy ion beams can be easily accelerated. However, it was rather difficult to obtain longer pulse especially for highly charged particles. To induce highly charged states ions, a high plasma temperature is required at the laser irradiation point and the high temperature automatically gives a very fast expansion velocity of the plasma. This shortens the ion beam pulse length. To compensate the shorter ion pulse length, we can extend the plasma drift length, but it will dilute the brightness of the plasma since the plasma expands three dimensionally. To avoid the reduction of the brightness, a simple long solenoid was applied to confine the diverging angle of the plasma expansion. In the conference, this new technique will be explained and the latest results of iron beam acceleration will be shown. |
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THPB043 | The RFQ injector for the Radioactive Ion Beam of SPES Project | rfq, ion, linac, emittance | 951 |
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A Continous Wave Radio Frequency Quadrupole Accelerator has been designed for the Radioactive Ion Beam of SPES Project to be used as an Injector of the ALPI Linac. The RFQ frequency is 80 MHz for an input energy of 40 keV, with output energy of 5 MeV and ion ratio q/A<= 1/7. Particular care has been put in the design phase to include an internal bunching section able to reduce the longitudinal output emittance. The details of the RF study of such a cavity are included as well. | |||