accelerator tube
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scholarly journals Research of Parameters of the Powerful Electron Beam of Industrial Accelerator ELV

2019 ◽  
Vol 14 (2) ◽  
pp. 5-20
Author(s):  
E. V. Domarov ◽  
D. S. Vorobyov ◽  
M. G. Golkovsky ◽  
Yu. I. Golubenko ◽  
A. I. Korchagin ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Power ◽  
Factors Affecting ◽  
Gas Dynamic ◽  
Extraction Device ◽  
Dynamic Extraction ◽  
New Type ◽  
Accelerator Tube ◽  
Industrial Accelerator ◽  
Powerful Electron

This article deals the factors affecting the diameter and angle of divergence of the electron beam at the exit from the accelerator tube of an industrial ELV series accelerator. Measurements of the parameters of a high-power electron beam were carried out up to a power of 100 kW. On the basis of the data obtained, a new type of gas-dynamic extraction device was designed and pre-tested, which can efficiently output a focused electron beam to the atmosphere.

Fabrication of Compact Ion Implanter for Silicon Carbide Devices

2005 ◽  
Vol 483-485 ◽  
pp. 605-608
Author(s):  
S. Mitani ◽  
Seiji Yamaguchi ◽  
S. Furukawa ◽  
T. Nakata ◽  
Yuji Horino ◽  
...  
Keyword(s):  
Large Scale ◽  
Secondary Ion Mass Spectrometry ◽  
Rutherford Backscattering Spectrometry ◽  
Amorphous Layer ◽  
Ion Source ◽  
High Acceleration ◽  
Infrared Spectrometer ◽  
Accelerator Tube ◽  
Acceleration Voltage ◽  
Secondary Ion

Most of the ion implanter is large scale, high acceleration voltage and expensive. For research and development, such a huge implanter is not required. Our motivation is to make desktop type ion implanter for SiC device. We report the fabrication of a compact 100 kV ion implanter. In order to miniaturize the equipment, an ion source, an accelerator tube and a main chamber were vertically arranged. We implanted Argon (Ar) and Nitrogen (N) ions to 6H-SiC substrate and the implanted 6H-SiC substrates were characterized by Fourier Transform Infrared Spectrometer (FTIR), Rutherford Backscattering Spectrometry (RBS) and Secondary Ion Mass Spectrometry (SIMS). In this report, concept of desktop ion implanter, evaluation of implanted substrate and its device application are presented. In order to characterize capability, with using the newly made compact ion implanter, it was possible to make implantation on SiC to get amorphous layer suitable for deices.

Development of a sealed-accelerator-tube neutron generator

2000 ◽  
Vol 53 (4-5) ◽  
pp. 801-809 ◽  
Author(s):  
J.M. Verbeke ◽  
K.N. Leung ◽  
J. Vujic
Keyword(s):  
Neutron Generator ◽  
Accelerator Tube

frequency of 100-200 Hz the beam is moved to and fro like a pendulum. The reason for this is that the material to be irradiated must, as nearly as possible, receive the same radiation dose in all its parts. The electron beam has a diameter of only a few millimeters or centimeters. Without scanning, the electron beam would concentrate the whole beam power on a very small area of the irradiated goods. By scanning the electron beam and simultaneously moving the material to be irradiated perpendicularly to the scanning line of the electron beam, an even distribution of radiation energy to the irradiated material can be achieved. It is very difficult to handle accelerating potentials higher than 5 MeV in DC accelerators, whereas linacs can produce electron energies even higher than the 10 MeV allowed for food irradiation. In a linac (Fig. 7), pulses or bunches of electrons produced at the thermionic cathode are accelerated in an evacuated tube by driving RF electromagnetic fields along the tube. The electrons ride on a traveling electromagnetic wave, comparable with a piece of wood or a surfer riding the crest of a water wave. The RF generator is designated high-power klystron tube in Figure 7. The electron beam leaving the accelerator tube can be scanned in the same way as for DC accelerators. Linac electrons are also monoenergetic, but the beam is pulsed rather than continuous. An electron pulse of a few micro-seconds duration may be followed by a dead time of a few milliseconds, with different manufacturers using different timings. When the dose rate provided by a pulsed electron beam is described, it is important to indicate whether this is the pulse dose rate or the overall dose rate of pulse plus dead time. Linac designs other than the traveling wave type described here are available (7). A number of linacs have been built specifically for food irradiation studies.

1995 ◽  
pp. 39-39
Keyword(s):  
Electron Beam ◽  
Dose Rate ◽  
Dead Time ◽  
Radiation Energy ◽  
Food Irradiation ◽  
Beam Power ◽  
Pulsed Electron Beam ◽  
Pulse Dose ◽  
Accelerator Tube ◽  
Scanning Line

A 300-kV field-emission Transmission Electron Microscope

1992 ◽  
Vol 50 (2) ◽  
pp. 936-937
Author(s):  
H. Murakoshi ◽  
M. Ichihashi ◽  
H. Kakibayashi
Keyword(s):  
Field Emission ◽  
Electron Gun ◽  
The Other ◽  
Atomic Resolution ◽  
Stable Operation ◽  
External View ◽  
Energy Fraction ◽  
Stray Magnetic Field ◽  
Transmission Electron ◽  
Accelerator Tube

For the ultimate resolution of 0.1 nm, we have developed a 300 kV field-emission TEM (FE-TEM). Atomic resolution requires conventional TEM to have an accelerating voltage to 1MV or higher, if a thermionic electron gun is used. On the other hand, an FE-TEM allows atomic resolution at a medium accelerating voltage. A 200 kV FE-TEM with a (310)-oriented cold W field emitter has already been developed and commercially released as the Hitachi HF-2000. Its information limit is 0.155 nm.To improve the resolution of an FE-TEM, we increased the accelerating energy E from 200 keV to 300 keV to reduce the electron wavelength and the energy fraction ΔE/E. A ten-stage accelerator tube was designed to maintain stable operation at 300 kV. The external view of the accelerator tube is shown in Figure 1. It is shielded by three layers of electrodes made of permalloy to lessen the influence of the stray magnetic field.

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