한국의학물리학회:학술대회논문집 (Proceedings of the Korean Society of Medical Physics Conference)
- 한국의학물리학회 2002년도 Proceedings
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- Pages.400-403
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- 2002
Soft Plasma Flash X-ray Generator Utilizing a Vacuum Discharge Capillary
- Sato, Eiichi (Department of Physics, Iwate Medical University) ;
- Hayasi, Yasuomi (Electrical Engineering, Hachinohe National College of Technology) ;
- Usuki, Tatsumi (Toreck Inc.) ;
- Sato, Koetsu (Toreck Inc.) ;
- Takayama, Kazuyoshi (Shock Wave Research Center, Institute of Fluid Science, Tohoku University) ;
- Ido, Hideaki (Department of Applied Physics, Faculty of Engineering, Tohoku Gakuin University)
- 발행 : 2002.09.01
초록
The fundamental experiments for measuring soft x-ray characteristics from the vacuum capillary are described. These experiments were primarily performed in order to generate line spectra such as x-ray lasers. The generator consists of a high-voltage power supply, a polarity-inversion ignitron pulse generator, a turbo-molecular pump, and a radiation tube with a capillary. A high-voltage condenser of 200 nF in the pulse generator is charged up to 20 kV by the power supply, and the electric charges in the condenser are discharged to the capillary in the tube after closing the ignitron. During the discharge, weakly ionized plasma forms on the inner and outer sides of a capillary. In the present work, the pump evacuates air from the tube with a pressure of about 1 mPa, and a demountable capillary was developed in order to measure x-ray spectra according to changes in the capillary length. In this capillary, the anode (target) and cathode elements can be changed corresponding to the objectives. The capillary diameter is 2.0 mm, and the length is adjusted from 1 to 50 mm. When a capillary with aluminum anode and cathode electrodes was employed, both the cathode voltage and the discharge current almost displayed damped oscillations. The peak values of the voltage and current increased when the charging voltage was increased, and their maximum values were -10.8 kV and 4.7 kA, respectively. The x-ray durations observed by a 1.6