A Portable Electron Beam Generator for Relativistic Electron Beam Characterization Experiments (original) (raw)

Design and performance of a Tesla transformer type relativistic electron beam generator

Sadhana, 1986

A relativistic electron beam generator driven by an air core Tesla transformer is described. The Tesla transformer circuit analysis is outlined and computational results are presented for the case when the coaxial water line has finite resistance. The transformer has a coupling coefficient of~56 and a step-up ratio of 25. The Tesla transformer can provide 800 kV at the peak of the second half cycle of the secondary output voltage and has been tested up to 600 kV. A 100-200 keV, 15-20 kA electron beam having 150 ns pulse width has been obtained. The beam generator described is being used for the beam injection into a toroidal device aETA.

Tesla transformer accelerator for the production of intense relativistic electron beams

Review of Scientific Instruments, 1975

Authors: I. Boscolo, G. Brautti, R. Coisson, M. Leo, A. Luches Abstract: A resonant transformer high-voltage (HV) generator is described that delivers a l.l-MV peak on the HV head of the secondary circuit. The HV head feeds afield emission diode that gives out a 6-kA/20-nsec electron beam. Highrepetition rates, up to 3 pulses/sec (power supply limited), have been attainedwith foilless diodes. Design details and electron beam characteristics are givenand discussed

Portable & Low Cost GigaWatt Pulsed Power Source for Intense Electron Beam Generation

2005

An alternative approach for applications requiring production of intense electron beam without using conventional configuration of Marx/Tesla accompanying Pulse Forming Line has been explored. The developed portable system utilizes four stage Blumlein pulse forming network made from inexpensive commercially available URM-67 coaxial cables having characteristic impedance of 50Omega. All stages are charged in parallel and then synchronously discharged through single low inductance railgap switch. Use of low jitter (<5 ns) railgap switch allows synchronization with other events and improves reproducibility of the system. Each stage of Blumlein is configured as eight parallel pulse forming network, with a resultant output impedance of 6.25 Omega per stage. For four stages the output impedance is therefore 25 Omega. A 24 V battery driven 50 kV DC to DC Converter has been used for charging the system. The generator is capable of delivering power up to 200 kV, 4 kA across matched load of 50 Omega. The voltage pulse duration and rise time are 50 ns and 8 ns respectively. In the presented paper, generator construction has been described and performance of the system is evaluated to realize adverse effect of parasitic impedance on the voltage gain and pulse shape. Also its operation has been simulated by PSPICE circuit simulator program and good agreement has been obtained between simulated and experimental results. The entire cost of the generator including raw material and labor is under US $2500. Other than low cost of the generator, added advantage of cable based system is that - the slow DC charging of transmission line to a known voltage eliminates the possibility of diode voltage prepulse in electron beam generation experiments. Applications of this pulse generator also include flash X- ray generation, breakdown tests, ion implantation, streamer discharge studies, ultra wideband generation etc.

Portable&Low Cost Giga-Watt Pulsed Power Source for Intense Electron Beam Generation

2005 IEEE Pulsed Power Conference, 2005

An alternative approach for applications requiring production of intense electron beam without using conventional configuration of Marx/Tesla accompanying Pulse Forming Line has been explored. The developed portable system utilizes four stage Blumlein pulse forming network made from inexpensive commercially available URM-67 coaxial cables having characteristic impedance of 50Ω. All stages are charged in parallel and then synchronously discharged through single low inductance railgap switch. Use of low jitter (<5ns) railgap switch allows synchronization with other events and improves reproducibility of the system.

Low Cost Gigawatt Pulsed Power Source for Intense Electron Beam Generation

2005

An alternative approach for applications requiring production of intense electron beam without using conventional configuration of Marx/Tesla accompanying Pulse Forming Line has been explored. The developed portable system utilizes four stage Blumlein pulse forming network made from inexpensive commercially available URM-67 coaxial cables having characteristic impedance of 50Ω. All stages are charged in parallel and then synchronously discharged through single low inductance railgap switch. Use of low jitter (<5ns) railgap switch allows synchronization with other events and improves reproducibility of the system.

Design and development of pulsed electron beam accelerator 'AMBICA – 600

Journal of Physics: Conference Series, 2012

Short duration, high power pulses with fast rise time and good flat-top are essentially required for driving pulsed electron beam diodes. To attain this objective, a dual resonant Tesla transformer based pulsed power accelerator 'AMBICA-600' has been developed. In this newly developed system, a coaxial water line is charged through single turn Tesla transformer that operates in the dual resonant mode. For making the accelerator compact, in the high power pulse forming line, water has been used as dielectric medium because of its high dielectric constant, high dielectric strength and high energy density. The coaxial waterline can be pulsed charged up to 600kV, has impedance of ~5 and generates pulse width of ~60ns. The integrated system is capable of producing intense electron beam of 300keV, 60kA when connected to impedance matched vacuum diode. In this paper, system hardware details and experimental results of gigawatt electron beam generation have been presented.

Development of a 300-kV Marx generator and its application to drive a relativistic electron beam

Sadhana, 2005

We have indigenously developed a twenty-stage vertical structure type Marx generator. At a matched load of 90-100 , for 25 kV DC charging, an output voltage pulse of 230 kV, and duration 150 ns is obtained. This voltage pulse is applied to a relativistic electron beam (REB) planar diode. For a cathodeanode gap of 7·5 mm, an REB having beam voltage 160 kV and duration 150 ns is obtained. Brass as well as aluminum explosive electron emission-type cathodes have been used.

The design of a pulsed, repetitive, high voltage electron beam driver

2010 IEEE International Power Modulator and High Voltage Conference, 2010

A medium power, repetitive electron beam generator has been designed and fabricated to enable the evaluation of a novel, large-area electron-transparent window. The test stand was developed to demonstrate the electron transparency and the thermal response of the window to an electron beam. The electron beam generator design is described in this article, and focuses on the electrical driver circuit and the electron gun, including external electron beam focusing elements.

High Power Pulsed Electron Accelerators Development for Industrial Applications

www-pub.iaea.org

Present paper describes the design and test results of indigenously developed electron beam pulsed accelerator, which is a kilo ampere linear injector: KALI-5000 having ratings of 1 MV, 80 kA, 100 ns, 80GW. It comprises of Marx generator, Blumlein pulse forming line (PFL) and relativistic electron beam diode. It is a single shot system. In view of numerous industrial and strategic applications of electron beam accelerators, BARC is actively pursuing the design and development of various kinds of accelerators viz. 10 MeV RF accelerators, 0.5-3 MeV DC accelerator and 0.2-1 MeV pulsed electron accelerator. This paper presents the subsystem details of KALI-5000 and recent experimental results with electron beam emission.