HIGH POWER ELECTRON ACCELERATOR PROGRAMME AT BARC

High current intense electron beams were investigated earlier for Flash X-rays and nuclear electromagnetic pulse generation. Starting with moderate parameters of 200 kV, 6 kA, 60 ns pulsed electron beam source from a system named Kilo Ampere Linear Injector (KALI-75) our latest development is KALI-30 GW system rated for 1 MV, 30 kA, 80 ns. First repetitive pulse LINAC without spark gap switching was developed as Linear Induction Accelerator (LIA-200) for technology demonstrations at 100 Hz. Also a repetitive Marx generator coupled reflex triode system to operate at 10 Hz. Next to this series of development LIA-400 has been developed to a capacity of 400 kV, 4 kA, 100 ns, 300 Hz. To make these pulse power systems applicable for big LINAC projects like nToF studies or ADS program, a high current electron gun has also been developed to give 100 A, 2 ns,10 Hz pulses.

Journal of Physical Science and Application, 2015

Dynamitron DC1500/25/04 type EBA (Electron beam accelerator), model JOB 188, was manufactured by IBA Industrial (Radiation Dynamics, Inc.) and installed at IPEN-CNEN/SP, in 1978. The technical specifications of the EBA are: energy 0.5 to 1.5 MeV; beam current: 0.3 to 25.0 mA; beam scanning: 60 to 120 cm; beam width: 25.4 mm and frequency: 100 Hz. Nowadays, this accelerator has been used for innumerable applications, such as: For sterilization of medical, pharmaceutical and biological products, treatment of industrial and domestic effluents and sludge, preservation and disinfestations of foods and agricultural products. Other important application are lignocellulosic material irradiation as a pre-treatment to produce ethanol bio-fuel, decontamination of pesticide packing, solid residues remediation, organic compounds removal from wastewater, treatment of effluent from petroleum production units, crosslinking of foams, wires and electric cables. Electron accelerator JOB 188 is, also, very important composite and nanocomposite materials and carbon fibers irradiation, irradiated grafting ion-exchange membranes for fuel cells application, natural polymers and multilayer packages irradiation and biodegradable blends production. The energy of the electron beam is calculated as a function of the current in the accelerator high-voltage divisor, taking into account the thickness and density of the material to be irradiated. This energy is calculated considering the electron through the entire material and the distance from the titanium foil window, so that the absorbed doses at the points of entrance and exit are equivalent on the material. The dose is directly proportional to the beam current and the exposure time of the material under the electron beam and inversely proportional to the scan width. The aim of this paper is to analyze the power system parameters of the EBA Dynamitron DC1500/25/04, such as, voltage and RMS (Root-mean-square) current in the oscillator system, high voltage generator and waveform. For this purpose software developed in the Radiation Technology Center at IPEN/CNEN-SP to simulate the energy efficiency of this industrial accelerator. Finally, it is also targeted to compare theoretical dosimetry using parameters of energy and beam current with data from the accelerator power system. This knowledge and technology will be very useful and essential for the control system upgrade of EBA, mainly Dynamitron DC1500/25/04 taking into consideration that radiation processing technology for industrial and environmental applications has been developed and used worldwide.

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008

In the last decades radiation processing has been more and more applied in several fields of industrial treatments and scientific research as a safe, reliable and economic technique. In order to improve existing industrial techniques and to develop new applications of this technology, at the Physics Department of Messina University a high power 5 MeV electron linac has been studied and set-up.

2019

We present the overview and beam parameters measurements results as well as the operational experience with the S-band pulsed linear electron accelerator with beam energy in the range of 5-10 MeV and maximum beam power of up to 15 kW. The possibility of adjusting the beam parameters in a wide range, provided by the design and control system of the accelerator, allows to use the accelerator in a wide variety of radiation technologies.

2015

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 reasons, the SF 6 gas is reincorporated into a closed cycle because gas should not be released into the atmosphere. The aim of the SF 6 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. A heat load of 12 kW is coming due to high frequency transformer, electron gun, power supplies, motor alternator system, fan motor and blower etc. A radiator type heat exchanger with high-pressure blower and finned tube has been used for cooling the gas. This paper discusses about mechanical design, fabrication, testing and safety of different components of SF 6 gas handling system such as gas piping, non lubricating compressor, dryer, vacuum pump, dust & oil filters, storage tanks etc. It also discusses about mechanical and thermal design of heat exchanger, which includes calculations of heat transfer coefficient, surface area, pressure drop, design and selection of high-pressure blower, 5-ton chiller unit, insulation and cooling tower.

Radiation Physics and Chemistry, 2012

The radiation processing technology for industrial and environmental applications has been developed and used worldwide. In Latin America and the Caribbean and particularly in Brazil there are 24 and 16 industrial electron beam accelerators (EBA) respectively with energy from 200 keV to 10 MeV, operating in private companies and governmental institutions to enhance the physical and chemical properties of materials. However, there are more than 1500 high-current electron beam accelerators in commercial use throughout the world. The major needs and end-use markets for these electron beam (EB) units are R and D, wire and electric cables, heat shrinkable tubes and films, PE foams, tires, components, semiconductors and multilayer packaging films. Nowadays, the emerging opportunities in Latin America and the Caribbean are paints, adhesives and coatings cure in order to eliminate VOCs and for less energy use than thermal process; disinfestations of seeds; and films and multilayer packaging irradiation. For low-energy EBA (from 150 keV to 300 keV). For mid-energy EBA (from 300 keV to 5 MeV), they are flue gas treatment (SO 2 and NO X removal); composite and nanocomposite materials; biodegradable composites based on biorenewable resources; human tissue sterilization; carbon and silicon carbide fibers irradiation; irradiated grafting ion-exchange membranes for fuel cells application; electrocatalysts nanoparticles production; and natural polymers irradiation and biodegradable blends production. For high-energy EBA (from 5 MeV to 10 MeV), they are sterilization of medical, pharmaceutical and biological products; gemstone enhancement; treatment of industrial and domestic effluents and sludge; preservation and disinfestations of foods and agricultural products; soil disinfestations; lignocellulosic material irradiation as a pretreatment to produce ethanol biofuel; decontamination of pesticide packing; solid residues remediation; organic compounds removal from wastewater; and treatment of effluent from petroleum production units and liquid irradiation process to treat vessel water ballast. On the other hand, there is a growing need of mobile EB facilities for different applications in South America.

2004

2019

The report presents the results of development of applied linear electron accelerators with an energy of up to 10 MeV, performed by the Laboratory of Electron Accelerators MSU. We describe linear accelerators for mobile, stationary and train cargo inspection systems with interlaced energies and pulse repetition rate up to 2 kHz, accelerators for radiography, a sterilization accelerator with beam parameters that are adjustable over a wide range, and an accelerator for a radiotherapy complex. INTRODUCTION Laboratory of Electron Accelerators MSU Ltd. (LEA MSU) was established on the base of Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University (SINP MSU) in 2013. Within five years we have designed six different types of linear accelerators for security, industry and medicine and supplied customers with more than 20 units. The customer of accelerators for security systems is the co-founder of the LEA MSU Scantronic Systems LLC, which developed a number of cargo inspe...

2002

Recent years have seen an increasing interest in the use of intense, short pulse electron beams for pulsed radiolysis research. Laser driven photo-cathodes inserted in radio frequency guns are ideal candidates to provide ‘pump’ electron beams in pump-probe type experiments. These guns have been developed through accelerator R&D programmes in the field of high brightness sources for other applications (Linear Colliders, Free Electron Lasers). The Physical Chemistry Department at the Université de Paris-Sud has created a ‘Centre de Cinetique Rapide’ for experimental radiolysis with picosecond time resolution. At the heart of this new facility is a small ~ 9MeV electron accelerator, ELYSE, using RF gun technology. We will describe the construction and commissioning of ELYSE, the first machine of this type in Europe.

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993

The material throughput capabilities of RDI's new 550 keV and 800 keV DynamitronR accelerators have been enhanced by increasing their beam current ratings from 100 mA to 160 mA. Future requirements up to 200 mA have been anticipated in the designs. The high-voltage power supply, beam scanner and beam window have all been modified to accommodate the higher current ratings. A new programmable control system has also been developed. The basic design concepts are described and performance data are presented in this paper.

AIP Conference Proceedings, 2016

This paper describes the method to identify the magnetic coil parameters of the scanning system. This locally designed low energy electron accelerator with the present energy of 140 keV will be upgraded to 300 keV. In this accelerator, scanning system is required to deflect the energetic electron beam across a titanium foil in vertical and horizontal direction. The excitation current of the magnetic coil is determined by the energy of the electron beam. Therefore, the magnetic coil parameters must be identified to ensure the matching of the beam energy and excitation coil current. As the result, the essential parameters of the effective lengths for X-axis and Y-axis have been found as 0.1198 m and 0.1134 m and the required excitation coil currents which is dependenton the electron beam energies have be identified.

The report contains the review of electron linac research and development activity at the National Science Center "Kharkov Institute of Physics and Technology". The main results on the research of electron sources (RF guns, secondary emission guns), injector systems, accelerating structures are presented. The report also presents descriptions of some applications of designed linacs.

2005

The MINAC series portable linear electron accelerator systems designed and manufactured at American Science and Engineering, Inc. High Energy Systems Division (AS&E HESD) are discussed in this paper. Each system can be configured as either an X-ray or electron beam source. The 4 MeV and 6 MeV linacs powered by a 1,5 MW magnetron permit operation in a dose rate range from 100 R/min to 600 R/min at 1 meter from X-ray target. Each MINAC is a self-contained source with standard radiation leakage less than 0,1% of the maximum dose. Along with these systems, an ultracompact 1 MeV MINAC has been successfully tested. The unit is tested to generate up to 100 R/min @ 1 m in energy range from 1 to 3 MeV with radiation leakage less then 0.01%. The results of low and high power test are presented.

proceedings of the …, 2004

The applications of industrial accelerators span the range from plastic modifications, treatment of flu gases and medical sterilization to food processing. Pulsed electron beams and their conversion into X-rays have potential applications in the industry with the ...

1995

Under this CRADA we have carried out a joint research and development program between the Accelerator Test Facility at the National Synchrotron Light Source Department at Brookhaven National Laboratory and Northrop-Grumman Corporate Research Cmter of Princeton New Jersey. The subject of this research was the development of an advanced laser photocathode RF electron gun for the generation of high brighbress electron beams. The intent of this work was to enhance the performance of the electron gun recentþ developed at Brookhaven