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| TUPMA036 | Comparative Studies of Electron Sources for a Free Electron Laser at PSI | emittance, electron, gun, cathode | 157 | ||
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Within the low emittance gun project LEG, the Paul Scherrer is currently conducting research into the development of a high brightness electron source suitable for free electron laser. The gun, planned to generate up to 5.5 Amperes of beam current, consists of a pulsed DC diode followed by a 1 1/2 cell RF gun. Using specialized codes, the performance of field emitter arrays is evaluated assuming realistic geometries. As alternatives, we examine the performance of using individual macroscopic field emission tips or conventional photo emission using copper cathodes. For these, optimized cathode geometries are presented and the performance is compared to that of field emitter arrays.
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| TUPMA083 | High Quantum Efficiency Photocathode for RF Guns | cathode, gun, laser, electron | 223 | ||
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High Quantum Efficiency Photocathodes are nowadays routinely used as electron sources for laser driven RF guns. In this paper, we review the production, characterization and operation performances of the Cs2Te photocathodes prepared at INFN Milano – LASA and operated at DESY for the FLASH and the PITZ photoinjectors.
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| TUPMA108 | Benchmarking of Multiparticle Phase Scan and Acceptance Scan Techniques for the SNS DTL | linac, simulation, target, beam-losses | 253 | ||
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For a high intensity linac such as SNS Drift Tube Linac, it matters to accurately determine the rf set-point of the tank rf field to minimize beam mismatch and potential beam loss. Two techniques were benchmarked which are multiparticle phase scan and acceptance scan techniques. Excellent agreement was obtained between the set-points obtained from the two techniques. The analysis of both techniques are based on multiparticle tracking using the Parmila code.
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*SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U. S. Department of Energy. |
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| WEPMA022 | Electron Guns and Beamlines in the View of Emittance Compensation | gun, emittance, electron, cathode | 360 | ||
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Space charge effect is ever of fundamental importance for low-energy parts of accelerators. Criteria of the significance of space charge effect are derived in the presentation. Simple and robust estimations of the emittance degradation in various space charge affected beamlines and electron guns were obtained analytically and numerically. Nonuniform longitudinal and transverse distribution of current, accelerating and bunching were taken into account. The parameters of optimal beamlines for space charge affected beams were estimated.
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| WEPMA037 | Beam Coupling Impedance Studies of the CSNS Ring | impedance, kicker, coupling, extraction | 372 | ||
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The China Spallation Neutron Source (CSNS) is a high intensity proton accelerator with an injection energy of 80 MeV. The knowledge of impedance in the vacuum chamber is necessary for optimizing the accelerator performance. In this paper, the longitudinal and transverse coupling impedances of the CSNS Rapid Cycling Synchrotron (RCS) are estimated.
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| WEPMA044 | Program for the Generation of High-Current RFQ | rfq, emittance, linac, focusing | 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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| WEPMA045 | Study of Space Charge Compensation In LEBT | simulation, proton, quadrupole, rfq | 384 | ||
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A 20 MeV, 30 mA CW proton accelerator is being built in BARC which consists of 50 keV ECR ion-source, LEBT, 3 MeV RFQ, MEBT and 20 MeV DTL. In designing low energy beam transport (LEBT) line, which matches the beam from ion-source to RFQ, the expansion of the proton beam is a severe problem. As the energy of the beam is only 50 keV, coulomb repulsion is enormous and for minimization of this repulsion, space charge compensation is done. In this process, a gas is introduced in the beam pipe, which gets ionized by the beam. The produced electrons are trapped in the beam potential and reduce the repulsive space charge forces. To simulate the beam dynamics part, a PIC code is written, which allows beam of different distributions like KV, Parabolic, and Waterbag. This is an electrostatic code, which can also take care of external magnetic fields. A Monte Carlo collision scheme is being implemented for the ionization of the background gas. In this paper, we are presenting the simulation of space charge compensation of the 30 mA proton beam at 50 keV.
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e-mail: shashics@barc.gov.in |
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| WEPMA144 | High Power Microwave Generation From Coaxial Virtual Cathode Oscillator | cathode, electron, impedance, plasma | 523 | ||
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A coaxial virtual cathode oscillator (VIRCATOR) has been designed to generate Relativistic Electron Beams and High Power Microwaves. Coaxial virtual cathode oscillators are known for better efficiency compared to the axial virtual cathode oscillators. This Coaxial VIRCATOR has been designed for the KALI-5000 (1MeV, 60kA, 100 ns) pulse power system. Provision for a large anode cathode gap has been kept to avoid the prepulse effect during the electron beam generation from the KALI-5000 system. Experimental studies are carried out to generate and characterize Relativistic Electron Beams and High Power Microwaves. Relativistic Electron Beams are generated by the Coaxial Explosively emitted graphite cathodes. Electron beam voltage has been measured by a copper sulphate voltage divider and beam current by a B-dot probe. High Power Microwaves are detected by the glow of neon lamps placed closed to the output window.
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