Development and Characteristics of Pulsed Radiation Source Generated by Electron Beam Irradiation using Intense Pulsed Power Generator

2019 ◽  
Vol 139 (10) ◽  
pp. 435-436
Author(s):  
Kenji Kashine ◽  
Fumihiro Tamura ◽  
Takashi Kikuchi ◽  
Weihua Jiang
Keyword(s):  
Electron Beam ◽  
Radiation Source ◽  
Electron Beam Irradiation ◽  
Pulsed Power ◽  
Beam Irradiation ◽  
Power Generator ◽  
Pulsed Power Generator

scholarly journals Characteristics of pulsed power generator by versatile inductive voltage adder

2005 ◽  
Vol 23 (4) ◽  
pp. 573-581 ◽  
Author(s):  
KIYOSHI YATSUI ◽  
KOUICHI SHIMIYA ◽  
KATSUMI MASUGATA ◽  
MASAO SHIGETA ◽  
KAZUHIKO SHIBATA
Keyword(s):  
Electron Beam ◽  
Output Voltage ◽  
Potential Gradient ◽  
Open Circuit ◽  
Pulsed Power ◽  
Marx Generator ◽  
Good Reproducibility ◽  
Charge Voltage ◽  
Power Generator ◽  
Pulsed Power Generator

A pulsed power generator by inductive voltage adder, versatile inductive voltage adder (VIVA-I), which features a high average potential gradient (2.5 MV/m), was designed and is currently in operation,. It was designed to produce an output pulse of 4 MV/60 ns by adding 2 MV pulses in two-stages of induction cells, where amorphous cores are installed. As a pulse forming line, we used a Blumlein line with the switching reversed, where cores are automatically biased due to the presence of prepulse. Good reproducibility was obtained even in the absence of the reset pulse. Within ∼40% of full charge voltage, pulsed power characteristics of Marx generator, pulse forming line (PFL), transmission line (TL), and induction cells were tested for three types of loads; open-circuit, dummy load of liquid (CuSO4) resistor, and electron beam diode. In the open-circuit test, ∼2.0 MV of output voltage was obtained with good reproducibility. Dependences of output voltage on diode impedances were evaluated by using various dummy loads, and the results were found as expected. An electron-beam diode was operated successfully, and ∼18 kA of beam current was obtained at the diode voltage of ∼1 MV.

scholarly journals Impedance control using electron beam diode in intense pulsed-power generator

2015 ◽  
Vol 33 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Ryota Hayashi ◽  
Tomoaki Ito ◽  
Fumihiro Tamura ◽  
Takahiro Kudo ◽  
Naoto Takakura ◽  
...  
Keyword(s):  
Electron Beam ◽  
Space Charge ◽  
Impedance Control ◽  
Pulsed Power ◽  
Space Charge Limited Current ◽  
Input Energy ◽  
Output Current ◽  
Power Generator ◽  
Limited Current ◽  
Pulsed Power Generator

AbstractTo control an input energy for a load, an impedance control with a gap distance of an electron beam diode was studied using an intense pulsed-power generator. The output current of the pulsed-power generator as a function of the gap distance of electron beam diode was measured. It indicated that the behaviors of the experimentally obtained peak current and the theoretically obtained space-charge limited current were found to decrease with an increase in the gap distance. The input energy for the load was estimated from the output current, which decreased with an increase in the gap distance. It also revealed the space-charge limited current suppresses the input energy for the load with a decade.

Methods to Monitor and Improve the Performance of Specimen Holders for Transmission Electron Cryomicroscopy

1996 ◽  
Vol 54 ◽  
pp. 454-455
Author(s):  
B. L. Armbruster ◽  
B. Kraus ◽  
M. Pan
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Quality Of Data ◽  
Electron Cryomicroscopy ◽  
Thermal Equilibration ◽  
Transmission Electron ◽  
Electron Microscopes

One goal in electron microscopy of biological specimens is to improve the quality of data to equal the resolution capabilities of modem transmission electron microscopes. Radiation damage and beam- induced movement caused by charging of the sample, low image contrast at high resolution, and sensitivity to external vibration and drift in side entry specimen holders limit the effective resolution one can achieve. Several methods have been developed to address these limitations: cryomethods are widely employed to preserve and stabilize specimens against some of the adverse effects of the vacuum and electron beam irradiation, spot-scan imaging reduces charging and associated beam-induced movement, and energy-filtered imaging removes the “fog” caused by inelastic scattering of electrons which is particularly pronounced in thick specimens.Although most cryoholders can easily achieve a 3.4Å resolution specification, information perpendicular to the goniometer axis may be degraded due to vibration. Absolute drift after mechanical and thermal equilibration as well as drift after movement of a holder may cause loss of resolution in any direction.

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