| Paper | Title | Page |
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| TUPMA076 | Design and Development of Beam Transport Elements for the BARC-ECIL Linac | 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. | ||
| WEPMA011 | Design and Operating Experience of Triode Electron Guns for Industrial Electron Accelerators | 348 |
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| The Accelerator and Pulse Power Division of BARC is presently constructing three industrial electron accelerators for radiation applications. a) a 500 keV, 10 KW Cockcroft-Walton accelerator b) a 10 MeV ,10 KW RF electron linac and c) a 3 MeV, 30 KW DC machine. While the DC accelerators require an almost parallel beam with less than 0.5 degree divergence, the RF linac gun requires a 50 keV , 2 ampere pulsed beam of low emittance Using relativistic electron optics, including space charge effects, very simple triode gun designs with flat cathode, grid and anode apertures which fulfill these requirements and are easy to fabricate experimentally are described. Our operating experience with these guns will also be described. | ||
| WEPMA122 | Design and Development of 30 MeV, 3 kW RF Electron LINAC | 491 |
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| A 30 MeV, 3 kW RF Electron linac for neutron generation is being designed and developed. The Design parameters, beam studies etc. will be described in this paper. | ||
| WEPMA133 | Evaluation of External Q Using Kroll-Yu Method With Microwaves Studio | 503 |
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Design and development of superconducting cavity has been taken up as a part of Accelerator Driven Subcritical project(ADSS). An input coupler is designed for the same using Kroll-Yu method*. The evaluation procedure is optimized and the method has been successfully implemented for the evaluation high external Q**. The validity of the Kroll-Yu method is tested with the external Q calculations by P. Balleyguier method for the Benchmark cavtity which is a pillbox cavity of diameter ~200 mm, length ~150 mm with semi-rigid coaxial line***. It is found that the careful choice of data points provides accurate results over wide range.
* N. M.Kroll, D. U.L. Yu, "Computer determination of the external Q and resonant frequency of waveguide loadaed cavities", SLAC-PUB-5171, Jan1990(A) ** A. S.Dhavale and K. C.Mittal,"Evaluation of external Q of the superconducting cavity using Kroll-Yu method", Review Of Scientific Instruments 77, 066101 (2006)*** P. Balleyguier, "A straightforward method for cavity external Q computation", Particle Accelerators, Vol.57, P.113-127, 1997 |
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| WEPMA144 | High Power Microwave Generation From Coaxial Virtual Cathode Oscillator | 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. | ||
| THPMA043 | Development of 3 MeV, 30 kW DC Electron Accelerator at EBC, Kharghar | 682 |
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| A 3 MeV, 30 kW DC industrial electron accelerator has been designed and is in advanced stage of development at EBC, Kharghar, Navi Mumbai. Electron beam at 5 keV is generated in electron gun with LaB6 cathode and is injected into accelerating column at a vacuum of 10-7 torr. After acceleration, the beam is scanned and taken out in air through a 100 cm X 7 cm titanium window for radiation processing applications. The high voltage accelerating power supply is based on a capacitive coupled parallel fed voltage multiplier scheme operating at 120 kHz. A 50 kW oscillator feeds power to high voltage multiplier column. The electron gun, accelerating column and high voltage multiplier column are housed in accelerator tank filled with SF6 gas insulation at 6 kg/sq.cm. The accelerator is located in a RCC building with product conveyor for handling products. A central computerized control system is adopted for operation of the accelerator. Accelerator is in the advance stage of commissioning. This paper describes the design details and current status of the accelerator and its various subsystems. | ||
| THPMA064 | Development of a 200keV Linear Induction Accelerator | 720 |
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| Electron Linear Induction Accelerator (LIA) are for applications for applications in High Power Microwaves (HPM), high gradient accelerators, flash X-Ray radiography (FXR), flue gas clean-up, detoxification of chemicals, cross-linking of polymers, sterilization of food and medical devices, etc. The LIA-200 being developed at APPD/BARC consists of three main phases of pulse compression and voltage amplification, viz; (i)solid-state pulse modulator uses semiconductor devices, (ii)Pulse compression and voltage amplification stages, steps up to 200kV, 5 micro-seconds and compresses these pulses to 75kV, 10kA, 50ns in five stage and (iii)three induction cavities in ADDER mode for relativistic electron beam generation, with matched impedance of 5 ohms. Metglas cores have been used in the switches, cavities and pulse transformers. Deminaralized water capacitors and water transmission lines have been used for low impedance energy storage and compactness. The complete system has been assembled and ready for commissioning. LIA system will be operated from a PLC based control system which is under testing. | ||
| THPMA094 | SF6 Gas Handling System for 3 MeV, 30 kW Industrial Electron Beam Accelerator at EBC, Kharghar, Navi Mumbai | 779 |
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| The 3 MeV Accelerator Project involves designing, fabrication, installation and commissioning of a 3 MeV, 30 kW Industrial Electron Beam Accelerator with a terminal voltage of 3 MV and is housed inside the Electron Beam Centre building at Kharghar, Navi Mumbai. The Accelerator has capability of delivering electron beam of 3 MeV energy for radiation processing applications. For ecological and economical reason, the SF6 gas is reincorporated into closed cycle because gas should not be released into the atmosphere. The aim of the SF6 gas handling system is to introduce the gas at high pressure to the accelerator tank after evacuation and to bring back into the storage tanks with minimum loss. The gas handling system also provides purification of gas, prevention from mixing with air or any other substances, which may contaminate and thus bring down the high voltage insulation characteristics of the gas. This paper discusses about mechanical design, fabrication, testing and safety of different components of SF6 gas handling system such as gas piping, non lubricating compressor, dryer, vacuum pump, dust & oil filters, storage tanks etc. |