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| MOZMA03 | Status of FFAG Developments | acceleration, synchrotron, resonance, proton | 21 | ||||
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Status of FFAG Developments will be talked, which includes nonscaling FFAG for muon acceleration, scaling FFAG for medical and industrial use. The talk focuses on beam dynamics points of view, as well as the on-going project around the world.
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Slides
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| TUPMA076 | Design and Development of Beam Transport Elements for the BARC-ECIL Linac | linac, gun, electron, target | 220 | ||||
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A 10 MeV, 2 kW RF electron linac is under development for cargo scanning. It consists of electron gun, RF linac structure, solenoid focusing magnets, steering magnet, beam diagnostics and x-ray target. The beam diameter requirement at the target is 2mm. Since the beam is to be focused to a diameter of 2mm at the target; the transverse beam optics of the whole linac structure from gun end to the target has been simulated by solving the beam envelope equation. The beam envelope equation has been solved in radial direction by Runga-Kutta method consisting of external focusing field, RF fields, beam perveance and emittance. Various combinations of solenoid magnet focusing have been studied. It has been found that three solenoid magnets are required to focus the beam to a diameter of 2mm at the target, two between the electron gun and the linac entrance and the other between the linac exit and the target. Based on these studies two solenoid magnets has been designed and fabricated. Details of beam optics simulation results and the design of the solenoid magnets will be presented.
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| WEPMA005 | Magnetic Field Calculations of a 10 MeV High Current Compact Cyclotron | cyclotron, betatron, extraction, injection | 342 | ||||
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A 10MeV, 5-10mA 4-sector compact proton cyclotron, is being developed at VECC. A 2.45 GHz microwave ion source will produce ~30mA of proton beam at 100keV. It will be bunched and injected axially in the central region of the cyclotron where a spiral inflector will place the beam on the proper orbit. Two delta type resonators located in the opposite valleys will be used for providing acceleration to the beam. Beam will be extracted using an electrostatic deflector. The main aim of this project is to study and settle various physics and technological problems associated with the handling of high intensity beams. In this paper we present the results of design studies of the main magnet. The conceptual dimensions of the magnet and the properties of equilibrium orbits were first obtained using hard edge approximations and matrix method. The primary size of the magnet was estimated using 2D POISSON code. Finally a 3D code was utilized for the field calculation and optimization. The profile of magnet sectors was optimized to get the desired values of isochronous field and the betatron tunes.
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| WEPMA014 | Inhomogenous Field Wien Filter Design | proton, ion, rfq, coupling | 354 | ||||
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The Wien velocity filter is a useful device that transports pure proton fraction from high-power ECR proton source to the RFQ. It is a deflecting device having crossed electrostatic and magnetostatic fields both perpendicular to the beam trajectory that deflects and eliminates the undesired species of ions from the main beam. A tilted-pole Wien filter (*) surpasses the classical parallel-rectangular-poles Wien filter in performance as the former eliminates the astigmatism. The present paper describes the design of an inhomogeneous field Wien filter where the equations of motion are developed and solved in a first-order approximation for a paraxial ion beam inside an ExB mass separator without considering the space charge effects. References : (*) New tilted-poles Wien filter with enhanced performance Review of Scientific Instruments 60 (3), March 1989
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| WEPMA024 | A General Model of the Resistive Wall Instability in Linear Accelerators | coupling, single-bunch, vacuum, linear-collider | 363 | ||||
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A general model for wakefield-generated instabilities in linear accelerators originally developed for cumulative beam breakup is applied here to the resistive wall instability. The general solution for various bunch charge distributions and application to various accelerator configurations will be presented.
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| WEPMA044 | Program for the Generation of High-Current RFQ | rfq, emittance, linac, space-charge | 381 | ||||
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In general design of the linear accelerators, the beam dynamics parameters are calculated from data describing the accelerator structure. In this approach, the desired phase advances (beam dynamics parameters) are obtained after several iterations of structure parameters. A program has been written for the generation of RFQ Linac, which is based on choosing the zero current transverse and longitudinal phase advances. Given the zero current transverse and longitudinal phase advances, the structure parameters are calculated using the analytical formulae. In this paper, we discuss the design of the high current RFQ using this procedure and compare it with that obtained from the standard codes.
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email: svlsr@barc.gov.in |
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| THC3H103 | The Compact Induction Circular Accelerator for Radiation Technologies | induction, electron, betatron, acceleration | 628 | ||||
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The variant of the circular accelerator of electrons with energy up to 10 ?eV is discussed. Acceleration is carried out by an induction electric field on a constant equilibrium orbit of radius about 50 cm. For reduction of reactive power of the accelerator the alternating magnetic fields are concentrated in small volume near to the equilibrium orbit. Use of high-frequency magnetic fields (tens or hundreds ?Hz) allows to increase power of the accelerated electron beam up to some tens kW or hundred kW.
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| THPMA022 | Design of the Proposed 250 Mev Superconducting Cyclotron Magnet | cyclotron, superconducting-magnet, proton, radiation | 661 | ||||
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VECC has proposed a project for the design and development of a 250 MeV superconducting proton cyclotron, which may be used in therapy. In this paper we describe the preliminary design calculations for the superconducting magnet. Hard-edge approximation method has been adopted for finding the poletip geometry to meet the basic focusing requirements of the beam. The uniform-magnetization method has been applied to calculate the 3D magnetic field distribution due to saturated iron poletips, to verify the beam dynamical issues and optimize the poletip geometry. GM type closed cryo-cooler technology is being considered for steady state liquifaction of evapourated He gas from magnet cryostat.
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| THPMA100 | Multipacting Study of Linac Prebuncher at CAMD | electron, linac, power-supply, storage-ring | 785 | ||||
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Multipacting currents can absorb RF energy and produce breakdown in the prebuncher cavity of CAMD linac*. This phenomenon starts when the magnetic field to focus the electron beam is applied. The multipacting has been studied in different magnetic field and RF electric field, and can be eliminated by RF processing. In the paper, the theoretical and experimental results of multipacting study will be presented; moreover, the operability of the system will be analyzed.
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* Y. Wang et al., “Upgrades of the Linac System at CAMD”. PAC2003, Portland, May 2003, p. 2892. |
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