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| MOPC089 | About Carbides-made Nanoceramics Fission Target for RIB Production | target, electron, extraction, ion | 268 | ||
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Intensities of RIBs can be increased with improvement of release efficiency of fission targets. One of factor, which limits release efficiency of targets, is efficiency of release of isotopes from target material. This paper presents investigation of dependence of release efficiency from ceramics target on its grain size and inter-grains pores, as well shows some efficiency limits and ways to improve it. Simulations were performed for uniform target material made from powder of uranium carbide. Inter-grain spaces are taken relative to grain sizes, as another parameter to optimize is high density of target material. Results show that optimal grain size is in the range of hundreds - thousands nanometers, while recent target materials utilize one order more sizes of grains. In addition, key points of production of such ceramics are discussed. The beam technologies allow producing the nanopowders from carbides of different metals with controlled grain size. Exact methods also give to us possibilities to obtain ceramics with optimal ratio between grain and pores sizes. Possible problems and preliminary program of experiments and tests are discussed.
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| MOPC090 | Driver Beam-led EURISOL Target Design Constraints | target, proton, ion, simulation | 271 | ||
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The EURISOL (European Isotope Separation Online) Design Study is addressing new high power target design challenges. A three-step method* was proposed to split the high power linac proton driver beam into one H- branch for the 4 MW mercury target that produces radioactive ion beams (RIB) via spallation neutron-induced fission in a secondary actinide target and three 100 kW H+ branches for the direct targets producing RIBs via fragmentation and spallation reactions. This scheme minimises transient thermo-mechanical stresses on targets and preserves the cw nature of the driver beam in the four branches. The heat load for oxides, carbides, refractory metal foils and liquid metals is driven by the incident proton driver beam while for actinides, exothermic fission reactions are an additional contribution. This paper discusses the constraints that are specific to each class of material and the target design strategies. An emphasis is placed on the modern engineering numerical tools and experimental methods used to validate the target designs.
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*A. Facco, R. Paparella, D. Berkovits, Isao Yamane, "Splitting of high power, cw proton beams", Physical Review Special Topics - Accelerators and Beams (2007). |
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| MOPC139 | Refractory Ovens for ECR Ion Sources and Their Scaling | plasma, ion, resonance, electron | 397 | ||
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The radiofrequency (rf) oven can be used as a metal vapour injector for Electron Cyclotron Resonance ion source; the application to high temperature boiling metals (like Cr, Ti and V) was recently demonstrated. Duration and reusability of oven parts were excellent, since crucible only need to be maintained at a temperature Ts larger than other parts; for vanadium case, achieved Ts was up to 2300 K with about 280 W of rf power, with the present design and size, tailored to our 14.4 GHz ECRIS. Optimization for different sources is discussed, and modern design tools are reviewed. Materials, more than rf power coupling, emerge as ultimate limits. Comparisons of results with resistive oven and sputter probes and with different metals are briefly reported.
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| MOPC141 | Design of a Novel Tubular Electron String Ion Source (TESIS) | ion, electron, extraction, gun | 403 | ||
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The project, started in 2007 is directed to creation of Tubular Electron String Ion Source (TESIS) and to basic studies of electron strings in tubular geometry. The collaboration consists of JINR (Dubna) and Russian Federal Nuclear Center (Sarov, Russia), Manne Siegbahn Laboratory (Stockholm, Sweden), TRIUMF and Atomic Energy of Canada Ltd. (Canada). Tubular concept of ion source has been proposed few years ago*. Preliminary theoretical estimations and numerical simulations have been done**,*** that allowed to start experimental realization of this project. New tubular source with a superconducting solenoid up to 5 Tesla should be constructed in 2009. It is expected that this new TESIS (“Krion-T1”) will meet all rigid conceptual and technological requirements and should provide ion output on a level, approaching to 10 mA of Ar16+ ions in the pulse mode and about 10 mA of Ar16+ ions in the average current mode. Having these output parameters, “Krion-T1” TESIS should be an operational prototype of further TESIS sources for all kinds of the possible applications. Simulation results and a basic scetch of the TESIS construction will be presented.
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*Donets E. D. et al. Rev. Sci. Instrum. 73, 696 (2002). |
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| MOPC142 | Study of the Post Extraction Acceleration Gap in the ISIS H- Penning Ion Source | acceleration, extraction, ion, emittance | 406 | ||
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The injection energy into the RFQ will be in the range of 50 to 70 keV whereas the standard ISIS H- Penning ion source operates at 35 keV, therefore the post extraction acceleration voltage must be increased. In order to finalise the design of the FETS post extraction system, a study is conducted on the Ion Source Development Rig (ISDR) at ISIS. This study shows how beam transport is affected by different post extraction acceleration voltages and gap lengths. Beam, current, profile and emittance measurements are presented along with theoretical calculations.
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| MOPC143 | Multi-beamlet Study of Beam Transport in the ISIS H- Ion Source Analysing Magnet | extraction, ion, acceleration, plasma | 409 | ||
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The existing 90° analysing magnet on the ISIS H- Penning ion source does not perfectly transport the beam after extraction. The present ion source has a 10 mm x 0.6 mm slit extraction aperture. To understand how the beam is transported in the analysing magnet, new ion source aperture plates are manufactured with 5 individual holes instead of a slit. These holes produce separate beamlets that are used to study transport in the sector magnet. This paper details the experiments with the modified aperture plates on the Ion Source Development Rig (ISDR) at ISIS.
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| MOPC144 | Installation of the Front End Test Stand High Performance H- Ion Source at RAL | ion, extraction, acceleration, power-supply | 412 | ||
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.
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| MOPC145 | Commissioning of the ECR Ion Sources at CNAO Facility | ion, emittance, plasma, extraction | 415 | ||
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The Centro Nazionale di Adroterapia Oncologica (National Center for Oncological Hadrontherapy, CNAO) is the Italian center for deep hadrontherapy. It will deliver treatments with active scanning both with proton and carbon ion beams. At CNAO two ECR sources of the Supernanogan type (built by the Pantechnik company according to specifications set by INFN) are installed and run continuously and in parallel, to allow the fast change of the particle species. The two sources are identical and can provide both particle species after a simple switch from one gas to the other, which allows as well to run the facility, in emergency, with only one source. Each source is equipped with a dedicated beam line including a spectrometer and beam diagnostics. Optimisation of beam emittance and intensity is of primary importance to obtain the necessary current at the RFQ-LINAC and then at injection. The preliminary tests have shown the complete fulfillment of the specifications in terms of beam current and emittance and the final tests are ongoing. A description of the source design and performance will be presented.
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| MOPC146 | Development of Piezoelectric Pulse Gas Valve for Small ECR Ion Source | ion, plasma, extraction, vacuum | 418 | ||
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In a conventional ion source, the source gas is continuously fed even in its pulse operation. This requires a high load to a vacuum pumping system. The situation is prominent when the gas load is relatively higher in such a high current ion source. In order to improve this situation, we try to supply gas only when it is needed by synchronizing the gas feed with the extraction of the ion beam. We have developed a small pulse-gas-valve using a commercially available disc-shape piezoelectric element. This valve is small enough to be mounted in our ECR ion source and is capable of very fast open-and-close operation of an order of kHz repetition. A small ECR ion source with this valve will be presented.
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| MOPC147 | Measurement of Ion Beam from Laser Ion Source for RHIC EBIS | ion, laser, plasma, target | 421 | ||
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Laser ion source (LIS) is a candidate of the primary ion source for the RHIC EBIS. LIS will provide intense charge state 1+ ions to EBIS for further ionization. We measured plasma properties of a variety of atomic species such as Si, Fe and Au using the second harmonics of Nd:YAG laser (532 nm wave length, up to 0.82 J / 6 ns). Since a suitable laser power density for production of charge state 1+ ions is different from different species, laser power density was optimized to obtain a maximum beam intensity in each species. Also the results of emittance measurement using pepper pot after ion extraction with about 20 kV extraction voltage will be shown. Based on the obtained results, performance of the LIS as the primary ion source for EBIS will be discussed in this paper.
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| MOPC148 | Target Life Time of Laser Ion Source for Low Charge State Ion Production | target, laser, ion, vacuum | 424 | ||
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Laser ion source produces ions by irradiating pulsed laser shots onto the solid state target. For the low charge state ion production, laser spot diameter on the target can be over several millimeters using the high power laser such as Nd:YAG laser (532 nm wave length, 0.82 J / 6 ns). In this case, damages to the target surface is small while there is a visible crater in case of the best focused laser shot (laser spot diameter can be several tens of micrometers) for high charge state ion production. Because damage to the target surface is small, target is not required to be moved to use fresh surface after each laser shot to stabilize plasma. In this paper, the results of target life time measurements will be shown.
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| MOPC150 | Modifications to the Analysing Magnet in the ISIS Penning Ion Source | extraction, ion, beam-transport, emittance | 427 | ||
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A full 3D electromagnetic finite element analysis and particle tracking study is undertaken of the ISIS Penning surface plasma ion source using CST Particle Studio 2008. The existing 90° analysing magnet is found to have a magnetic field index of 1.3, causing beam divergence and contributing to beam loss. Different magnet pole piece geometries are modelled and the effect of space charge investigated. Based on this modelling, three new sets of poles are manufactured and tested on the Ion Source Development Rig. The results are presented herein.
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| MOPC153 | Construction and Test of the Superconducting Coils for RIKEN SC-ECR Ion Source | sextupole, ion, factory, cyclotron | 433 | ||
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A superconducting ECR ion source is under development to increase the intensity of the beams with high charge state such as U35+ provided to the RI-beam factory at RIKEN. The ion source consists of six superconducting solenoids and a set of superconducting sextupoles. The axial magnetic fields are 3.8 T at the injection peak and 2.2 T at the extraction peak. The sextupole magnetic field is 2.0 T on the inner surface of the plasma chamber with a diameter of 15 cm. The conductors use NbTi/copper wires with copper/SC ratio of 1.3 and size of 1.25 mm x 0.92 mm. The sextupole coils are difficult to design and fabricate because the maximum experience magnetic field is about 7.3 T and the magnetic force acting on the coils changes by the strength of the radial field of the solenoids along the axis. The design, construction and the results of the excitation test will be presented in this paper.
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| MOPC154 | Method for Efficiency and Time Response Measurement on Diverse Target Ion Sources with Stable Alkali | ion, target, gun, plasma | 436 | ||
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Developments of new setups for radioactive ion beam production by the isotope-separator-on-line (ISOL) method are underway at GANIL in the frame of the SPIRAL (Système de Production d’Ions Radioactifs Accélérés en Ligne) and SPIRAL-II projects. The measurement of total efficiency and time behaviour of these new target/ion-source systems (TISSs) is a crucial step for these devices which aims to produce short-lived isotopes with high intensity. The overall atom-to-ion transformation efficiency depends on several processes: diffusion of the atoms out of the production target, effusion towards the ion source and ionization. The efficiency can be extracted using the ratio between the emerging yield and implanted flux in the TISS. Several methods have already been developed to achieve these measurements: the use of stable or radioactive beams, gas injection, or the introduction of solid material into the TISS. This paper focuses primarily on a method that uses stable alkali. A pulsed/CW alkali ion gun has been built and will be used to optimise diverse TISSs.
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[1] C. Eléon et al., Proceedings of the XVe International Conference EMIS, 24-29th June 2007, Deauville, France, to be published. |
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| MOPC155 | Transport System for Ion Implantation | ion, undulator, cathode, beam-transport | 439 | ||
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ITEP in collaboration with MEPHI and IHE (Tomsk) develops the high intensity ion beam generation and transport systems for low energy (1-50 keV) ion implantation. Such facilities are used for semiconductor technology. The Bernas type ion source is used for ribbon ion beam production. The periodical system of electrostatic lenses (electrostatical undulator) was proposed for ribbon beam transport line. The design of transport system and the results of beam dynamics investigation are presented. The influence of the electrodes construction errors on the beam dynamics is discussed.
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| MOPP111 | Beam Tests with the MAFF IH-RFQ at the IAP-Frankfurt | ion, emittance, rfq, quadrupole | 817 | ||
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The IH-type RFQ for the MAFF project at the LMU Munich is integrated into a test bench at the IAP in Frankfurt. The existing IH-RFQ set-up is the second after the HIS at GSI and the first one that can be directly compared to a very similar 4-rod type machine, the REX-ISOLDE RFQ at CERN. The test bench consists of an ionsource, an electrostatic quadrupole lens system with implemented steerers, and several beam diagnostic like a two dimensional emittance scanner, bending magnet and a fast faraday cup. Experimental results will be presented. These tests accompanied with theoretical investigations will be done with special respect to the applicability of such normal conducting RFQ accelerators to the EURISOL post accelerator.
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| TUPC057 | Improving the ISIS Emittance Scanner Software | emittance, background, ion, controls | 1185 | ||
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The software to drive the slit-slit emittance scanners at ISIS is re-written in C#. The scanner driver routine is enhanced to improve accuracy, and to allow real-time monitoring of the scanning procedure. A multiple document interface allows quick comparison with other measurements and with data from particle tracking codes. Integrated data processing and emittance calculation removes the need to transfer data between multiple software packages, making experimental work more efficient. A user-friendly and robust interface allows easy scanning and generates publication quality emittance plots for presentations.
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| TUPC059 | An Emittance Evaluation Toolbox | emittance, controls, ion, simulation | 1191 | ||
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A long-time experience in emittance measurements and result evaluation at GSI were transformed into the set of the numerical instruments to perform basic and advanced data analysis for the data obtained in various emittance measurement devices. The common problems and differences between slit-grid-, pepper-pot- and longitudinal emittance data analysis are discussed. Some aspects of non-linear algorithms particularly for the case of non-zero slits or pepper-pot holes are presented.
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| TUPD034 | Review of the Mechanical Engineering Challenges Associated with the SNS Power Ramp Up | vacuum, injection, diagnostics, ion | 1500 | ||
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Since commissioning of the SNS in April 2006 the beam power has been steadily increasing towards the design intensity of 1.4 MW. Several areas of the accelerator have been shown to require modifications, upgrades or new designs of mechanical equipment to support the power ramp schedule. This paper presents mechanical engineering design work implemented since initial commissioning along with a review of current projects and discussion of mechanical engineering issues being addressed that are a direct result of design decisions made early in the project.
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| TUPP113 | Intensity Upgrade Programme for the HIT Injector Linac | rfq, ion, linac, heavy-ion | 1788 | ||
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The Heidelberg Ion Beam Therapy Centre (HIT) is a worldwide unique radiation therapy facility and the first installation of its kind in Europe. It is equipped with three treatment rooms and has the potential to irradiate over 1000 patients per year. To guarantee such a high patient throughput, i.e. based on short irradiation times, and in order to prepare upcoming clinical requirements the currently limited beam intensity (particles per spill) needs to be increased. In an endeavour to provide optimum conditions for the patient treatment an intensity upgrade programme for the injector linac has been initiated. It affects primarily the ion source and the RFQ but also other linac components. The largest influence on the linac transmission is expected by a new RFQ design with optimised electrodes, which is currently commissioned on a test bench. The update programme is accompanied by beam dynamics simulations and machine studies. First improvements are presented and the status of the programme is given.
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| TUPP148 | Multigrid Negative Ion Source Test and Modeling | ion, plasma, electron, simulation | 1857 | ||
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Negative ion sources are a fundamental ingredient of neutral ion beam injectors for tokamak, like the ITER project and beyond. While detail of formation of negative ions and meniscus of the plasma beam interface at source extraction at source extraction is still debated, reasonable modelling of the beam extraction is well possible. A project of a small source (up to 9 beamlet of 15 mA each of H-, 60 kV acceleration voltage) is here described, and relevant modeling tools are reviewed. Power load deposition on the extraction grid (about 1.5 kW total) and on the source walls (comparable) need accurate cooling design. The extracted beam is direclty useful for wall damage studies.
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| WEPP080 | Baseline Design of the ESS Bilbao Linac | proton, ion, linac, target | 2704 | ||
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The baseline design for the ESS-B accelerator adheres to suggestions made by ESS-I, and seeks to enter a design phase for a machine based upon a 150 mA +H proton beam. Such intensity was to be delivered, as stated in the 2003 Technical Report by a tandem of two proton ion sources of some 85 mA each funnelled after the two beams are accelerated up to about 20 MeV. Current activities developed during the last few years within the CARE and EUROTRANS efforts have resulted in significant advances in both ion source and low-energy acceleration technologies which will surely have a relevant impact on the proposed accelerator design. More into specifics, our current activities are being directed towards the exploration of: |
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| THPP015 | Design of a Versatile Injector for a Low-energy Experimental Platform at KACST | ion, storage-ring, injection, extraction | 3404 | ||
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At the National Centre for Mathematics and Physics (NCMP), at the King Abdulaziz City for Science and Technology (KACST), Saudi Arabia, a multi-purpose low-energy experimental platform is presently being developed in collaboration with the University of Heidelberg, Germany. The aim of this project is to enable a multitude of low-energy experiments with most different kinds of ions both in single pass setups, but also with ions stored in a low-energy electrostatic storage ring. In this contribution, the injector of this complex is presented. It was designed to provide beams with energies up to 30 kV/q and will allow for switching between different ion sources from e.g. duoplasmatron to electrospray ion sources and to thus provide the users with a wide range of different beams. We present the overall layout of the injector with a focus on the optical design and the foreseen diagnostic elements.
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| THPP021 | Status of the Unilac-upgrade Programme for the Heavy Element Research at GSI-Ship | rfq, ion, heavy-ion, extraction | 3416 | ||
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For more than 30 years the heavy-element research using the velocity separator SHIP is one of the major experiments at GSIs heavy ion linear accelerator UNILAC. On of the major contributions which led to the discovery of six new elements since 1981 is the perpetual effort to increase the beam intensity. Since the early 1990's the beam current available was raised significantly by a number of improvements concerning the source, the LEBT and the accelerator. The next steps are scheduled for 2009 and include an upgrade of the Radio Frequency Quadrupole-accelerator (RFQ) and a new superconducting 28 GHz-ECR ion source. The new RFQ will allow higher duty factors up to 100% and improve the longitudinal beam quality as well as the beam transmission. The new ion source will provide an increase in beam intensity and simultaneously higher charge states. The new source will be installed in addition to the existing one, therefore a second LEBT-system has to be designed and integrated into the High Charge State Injector. This paper presents the status quo of both the RFQ and the ion source upgrade and will provide technical data.
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| THPP024 | Detailed Study of the RF Properties of the FETS RFQ Cold Model | rfq, simulation, quadrupole, coupling | 3422 | ||
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A 324MHz four vane RFQ cold model has been built, as part of the development of a proton driver Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) in the UK. Previous measurements to determine the electric field profile were made using the bead-pull perturbation method: these measurements have been refined and expanded. New measurements of the electric field profile, Q-value and resonant modes are presented. Measurements of the fundamental frequency and Q-value of the RFQ as a result of modifications to the profile of the end flange inserts are also given. Finally, an experiment is outlined to determine the beam transmission properties of the cold model based on beam transport simulations with the General Particle Tracer package (GPT).
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| THPP028 | Beam Tests of the PEFP 20 MeV Accelerator | rfq, proton, ion, dipole | 3434 | ||
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PEFP (Proton Engineering Frontier Project) 20 MeV proton accelerator has been installed and tested at KAERI (Korea Atomic Energy Research Institute) site. After the radiation license was issued, some parts were modified to increase a beam current above 1mA. Both an ion source and a LEBT (Low Energy Beam Transport) were modified for better matching of the beam into the 3 MeV RFQ. The field profile of the RFQ was measured to check the dipole field effect. In addition, control mechanisms to improve the RF properties of 20 MeV DTL were newly adopted. In this paper, the modifications of the 20MeV accelerator are summarized and the test results are presented.
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| THPP029 | Status of the RAL Front End Test Stand | ion, rfq, linac, diagnostics | 3437 | ||
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High power proton accelerators (HPPAs) with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. The UK's commitment to the development of the next generation of HPPAs is demonstrated by a test stand being constructed in collaboration between RAL, Imperial College London, the University of Warwick and the Universidad del Pais Vasco, Bilbao. The aim of the RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational conditions. This paper describes the current status of the RAL Front End Test Stand.
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| THPP034 | Design Study of Alternate Injector at Pelletron Accelerator Facility | rfq, ion, linac, simulation | 3443 | ||
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An alternate injector system is contrived under the AIDNP project in the Xth plan to utilize the 150MHz supercond. LINAC to its full capability. This injection system consists of ECR ion source, RFQ Linac and supercond. QWR cavities. This configuration can deliver high current and wider mass range(1/7≤ q/m≤1/2) beam into the S-LINAC with the required velocity acceptance which otherwise is not possible from pelletron. The design study from ion source to exit of RFQ is presented in this paper. Prior to injection to s-linac,the beam needs to be accelerated to an equivalent of 12-14MV/q. Beam from a high frequency(18GHz) ECRsource producing Au30+,U34+ and pre accelerated to 10keV/u will be injected into heavy ion RFQ. The RFQ operating at f/2 i.e.75MHz of the linac frequency, will accept beams with β=0.46% and accelerate upto β=3.5%.These beams would then go through two sets of superconductiong cavities with β=5.0% and β=7.0% respectively. This acceleration is expected to bring all ion beams from carbon to uranium, in the velocity range β=8%-10% which is suitable for linac. After further acceleration in Linac~12 MeV/u light ions and 7 MeV/u uranium beams would be available.
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| THPP038 | Phase 1 Commissioning Status of the 40 MeV Proton/Deuteron Accelerator SARAF | rfq, proton, emittance, ion | 3452 | ||
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Since January 2007 all accelerator equipment of the Phase 1 for the 40MeV Proton/Deuteron Accelerator is at the SARAF site and installed for the commissioning. The target of Phase 1 is to get the ECR ion source and RFQ into operation and to perform all relevant test with the cryo module housing 6 super conducting half wave resonators, to show that the design values of the system can be reached. Based on those results the Phase 2 shall start, to reach the final energy of 40MeV with up to 2mA of Protons and Deuterons. The ECR source is in routine operation since June 2006, the RFQ already have been operated with Protons and currently is under characterisation. After the characterisation has been finalised it is anticipated to move the cryo module in the beam line and to perform further beam characterisation. The entire beam characterisation is closely followed by beam dynamics simulations. Recent results of the commissioning will be presented and comparisons made between measurements and beam dynamics calculations.
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| THPP072 | Extinction Monitor by Using a Dissociation of Hydrogen Molecule to Atoms with High Energy Proton Beam | proton, ion, electron, monitoring | 3527 | ||
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In a recent high current accelerator technology there are so many reasons for resulting in unwanted or hallow beam to be coped with, such as resonance crossing, space charge induced emittance growth and so on. For an extinction for bunched beam of less than 10-7 order we need a particular scheme to diminish unwanted and hallow beam generated at not only spatial plane but also at longitudinal plane. In particular, the beam extinction between beam bunch is crucial for delayed coincidence measurements of intensity frontier and high sensitivity experiment such as muon to electron conversion and muon to electron gamma. The new detection method for the extinction is proposed by using a collision dissociation between a high energy proton with more than GeV energy and molecular ions. One path collision of high energy beam for molecular ion beam to be separated into atoms as well as its collision between stored molecular ions and high energy particles could be exploited for the monitor.
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| THPP098 | Simulations on a Beam Transport System for the Frankfurt Funneling Experiment | rfq, simulation, ion, resonance | 3593 | ||
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The goal of the Frankfurt Funneling Experiment is to multiply beam currents by mergeing two low energy ion beams. Our setup consists of two ion sources, a two beam RFQ accelerator, a multigap deflector and a beam diagnostics. Current work is the design of a new beam transport between RFQ accelerator and deflector and first simulations will be presented.
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| THPP100 | Development of New Ion Sources for the Frankfurt Funneling Experiment | ion, emittance, rfq, simulation | 3596 | ||
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Funneling is a method to increase beam currents in several stages. The Frankfurt Funneling Experiment is a prototype of such a stage. The experimental setup consists of two ion sources with electrostatic lens systems, a Two-Beam RFQ accelerator, a funneling deflector and a beam diagnostic system. The two beams are bunched and accelerated in a Two-Beam RFQ and the last parts of the RFQ electrodes achieve a 3d focus at the crossing point of the two beam axis. A funneling deflector combines the bunches to a common beam axis. The newly optimized ion sources are adapted to the front end bunching section. First results and measurements will be presented.
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| THPP108 | Temperature Measurements of Carbon Stripper Foil by Pulsed 650keV H- Ion Beam | target, ion, synchrotron, linac | 3620 | ||
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Thick carbon foils (>300 mg/cm2) has been used for stripping of H- ion beam at the 3 GeV Rapid Cycling Synchrotron (3GeV-RCS) of the J-PARC. The carbon stripper foils with long lifetime against high temperature >1800 °K are strongly required. We have recently developed a new irradiation system for lifetime measurement using the KEK 650keV Cockcroft-Walton accelerator with high current pulsed and dc H- beams, which can simulate the high-energy deposition upon foils in the RCS. The experimental results from the measured temperature of carbon stripper foil by the pulsed 650keV H- ion beam (-6mApeak, 0.3ms, 25Hz) and the observed time structure in the beam spot by a photo-transistor are described.
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