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| TUPMA070 | Progress of RFQ Accelerator at Peking University | rfq, ion, simulation, linac | 214 | ||||
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The progress of two RFQ accelerators at Peking University is presented: one is Separated Function RFQ (SFRFQ), which separates the focusing and acceleration of traditional RFQ to get higher acceleration efficiency. The first prototype of the SFRFQ is designed to accelerate O+ from 1MeV to 1.5MeV and used as a postaccelerator for ISR RFQ-1000 (Integral Split Ring) [1]. The other is high current deuteron 201.25MHz RFQ, it will accelerate 50mA D+ beam to 2MeV with a duty cycle of 10%. The design study of SFRFQ and high current Deuteron RFQ accelerator are outlined.
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| TUPMA113 | Design of High Current RF Ion Source for Micromachining Applications | ion, plasma, electron, extraction | 262 | ||||
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Liquid Metal Ion Source (LMIS) and Gas Field Emission Ion Source (GFEIS) are the major ones in micromachining applications so far. They have limitations of contaminations and low throughput respectively. Plasma based ion sources can produce heavier ions for higher throughput, lighter ions for fabrication of higher resolution structures, ions for doping, ion assisted direct writing of metallic, oxide, nitride and carbide layers and lines. Considering wide range of applications, a 13.56 MHz inductive coupled plasma (ICP) ion source for producing high brightness ion beams with very low energy spread has been developed. It is a very compact ion source with external helical antenna wound around a 30 mm quartz tube. 1 mA of Argon and 0.5 mA of proton ion beams have been extracted from 2 mm dia aperture in plasma electrode at 3.5 kV extraction potential and ~200W of RF power. Using LabView software and field point modules, an automated plasma diagnostic system has been designed and used to measure the plasma parameters. This paper describes the features of the ion source, ion beams produced, some results of the plasma diagnostics.
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| TUPMA115 | Simulations of Non-uniform High Density Electronegative Plasma for Optimization of H- ions and their Extraction | plasma, ion, electron, simulation | 265 | ||||
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Numerical simulations of radio frequency multi-cusp volume type H- ion source have been performed under non-uniform electronegative plasma equilibrium conditions in order to understand the physics of formation of various ion species (H+, H-, e- etc.) and for optimization of H- ion formation and extraction. Coupled momentum balance equations along with continuity equations were solved in a cylindrical geometry to obtain the density profile of various ion species. The relevant cross-section data available in the literature as a function of temperature has been used in the computation. The hydrodynamic model of plasma in equilibrium with background neutral gas has been used. Low degree of ionization ( ~1%) has been assumed. The collision less sheath formation, penetration of electric and magnetic field and power requirement to sustain the plasma has been worked out numerically. An effort has been made to give a self-consistent numerical scheme for the solution of inductively coupled plasma (ICP) in equilibrium, and the results obtained have been presented
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| TUPMA116 | Periodic Ion Current Burst in 6.4 GHz ECR Source | ion, electron, plasma, cyclotron | 268 | ||||
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We studied the enhancement in extracted ion current in the 6.4 GHz ECR ion source at VECC, Kolkata by inserting a negatively biased disc in the main stripping stage. In addition to the expected increase in current, we observed a sudden jump in the current at some low bias voltage. The jump amplitude is larger for higher charge states. In order to understand the origin of the jump, we recently measured the time spectra of high charge state ion current for neon. The time spectra revealed the presence of a burst frequency in the kilohertz range. This frequency shows a correlated jump with the ion current described above. Another feature is that the observed burst frequency shows a good linear correlation with the extracted ion current. This may signify that current per burst is a constant factor, higher current means that there are more number of bursts.
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| WEZMA05 | Status and Plans for the TRIUMF ISAC Facility | target, ion, cyclotron, linac | 325 | ||||
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The ISAC facility at TRIUMF uses the ISOL technique to create exotic isotopes in a thick target mainly through spallation from 500 MeV protons. The ISAC target area has operated for isotope production with up to 50 kW of beam power from the TRIUMF 500 MeV cyclotron. An ion beam formed from these exotic isotopes is transported at energies either to a linac for further acceleration or to any one of a suite of low energy experimental stations. For accelerating the isotopes an RFQ is followed by a five-tank drift tube linac that provides variable-energy accelerated exotic-beams from 0.15 to 1.8 MeV/u, primarily for nuclear astrophysics experiments. Twenty super conducting rf cavities have been recently added to the linac chain and commissioned with beams of stable isotopes, to increase in the maximum energy of the exotic beams to 4.3 MeV/u. Another 20 cavities will be added in 2009 to bring the energy to 6.5 MeV/u. A second proton beam line from the cyclotron and new target station for target and ion source development have been proposed for ISAC. In the future this new target station could be used as an independent simultaneous source of exotic beams for the experimental program.
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| WEPMA078 | HTS-ECRIS and Low Energy Beam Transport System of the High Current Injector | ion, extraction, electron, linac | 434 | ||||
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A high performance electron cyclotron resonance ion source (ECRIS) called PKDELIS capable of operation at 14.5 and 18 GHz and which uses High Temperature Superconducting (HTS) coils designed jointly by IUAC, Delhi (earlier called NSC), Pantechnik, Caen and ISN, Grenoble is presently in operation. The source is very suitable for operation on a 400 kV high voltage platform for injecting beams from the High Current Injector (HCI) into the Superconducting Linear Accelerator Booster. In the low energy beam transport (LEBT) system of the HCI, the beam extraction and transport becomes more and more challenging. In order to avoid the losses of the beam, the complete transport system is being made as short as possible. In addition, due to the high currents (~10 mA) extracted, the extraction system needs proper cooling requirements and possibility of movement of the electrodes for tuning various A/q beams. Typical axial and radial bremstraahlung spectra have been measured from the ECR plasma. Details will be discussed and further measurements are being explored to obtain a better understanding.
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| THC3H102 | Practical Considerations in the Design of a High Current Commercial H-minus Cyclotron | cyclotron, injection, ion, vacuum | 625 | ||||
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High current H-minus cyclotrons (>1000 micro-Ampere) are being developed and implemented for radioisotope production, radioactive therapeutic implants and other applications. The beam dynamics and general physics design of these cyclotron systems must be well done. However, in order not to compromise an elegant and effective physics design, practical engineering considerations must be carefully considered and then implemented. Based on our experience in the design, upgrading, and maintenance of commercial H-minus cyclotron systems, we offer "best practices" to be considered in the engineering design and implementations of such systems.
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| THPMA089 | Studies of Metallic Ion Beams using ECRIS | ion, plasma, extraction, background | 770 | ||||
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Low energy metallic ion beams find wide applications in various research fields especially in materials science, atomic and molecular physics. Several metallic ion beams have been developed successfully using all permanent magnet 10 GHz electron cyclotron resonance (ECR) ion source based low energy ion beam facility (LEIBF) [*] at IUAC. The most important feature of the facility is that the source and all its peripheral components including electronics and vacuum systems are on a high voltage platform (300 kV).The metallic ion beams were developed by different methods e.g. oven, sputtering, insertion and metal ions using volatile compounds (MIVOC). The ion source has been tuned to get optimum intensities of metallic ion beams. The high intensities of low charge state metallic ion beams are suitable to engineer the materials for optical, electrical and structural properties via ion implantation. For the interest of atomic and molecular physics, the high intensities of highly charged metallic ion beams are produced using gas mixing [**] and bias techniques. The charge state distribution studies of various metallic ion beams and gas mixing effect of different gases are presented.
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[*] P. Kumar et.al., Nucl. Instr. and Meth. B, 440 (2006) 246.[**] A. G. Drentje et.al., Rev. Sci. Instrum. 953 (1996) 67. |
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| THPMA110 | Status of BINP AMS Facility | ion, tandem-accelerator, vacuum, target | 794 | ||||
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The status of first Russian accelerator mass-spectrometer project is described. The scheme of spectrometer includes two types of ion sources (sputter and gaseous ones), low energy beam line with analysers, electrostatic tandem accelerator with accelerating voltage up to 2 MV and magnesium vapours stripper and also includes the high energy beam line with analysers. The results of last experiments are given.
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