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Proceedings Paper

Observation of cavitation bubble cloud using a stroboscopic x-ray generator
Author(s): Eiichi Sato; Hidenori Ojima; Kazuyoshi Takayama; Masatoshi Matsumasa; Haruo Obara; Masayuki Zuguchi; Tatsumi Usuki; Koetsu Sato; Kimio Sakamaki; Yoshiharu Tamakawa
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Paper Abstract

The radiographic characteristics of the condenser-discharge stroboscopic x-ray generator and its application to high-speed radiography are described. This generator employs a condenser- discharge medical x-ray generator in conjunction with a new grid-control unit and consists of the following major components: a high-voltage control unit, a condenser unit having a Cockcroft circuit, a grid-control unit, a high- voltage grid-control unit, and a rotating-anode x-ray tube unit. The main condenser of about 500 nF in the unit is charged up to 120 kV by the circuit, and the electric charges in the condenser are discharged to the triode by the grid control unit in conjunction with a high-voltage grid-control unit. The high-voltage grid-control unit is employed in order to insulate the negative high-voltage grid and cathode electrodes from the high-speed grid control unit with almost the ground potential. In this generator the anode and cathode electrodes are applied to high-voltages with maximum values of +60 kV and -60 kV, respectively. Although the tube voltage decreased during the discharging for generating x- rays, the maximum value was equivalent to the initial charging voltage of the main condenser. The maximum values of the tube current and the repetition rate were about 0.5 A and 32 kHz, respectively. The pulse width of the x-rays ranged from 0.01 to 1.0 ms, and the maximum shot number had a value of 32. At a constant filament (cathode) temperature, the x-ray intensity increased according to increases in the charging voltage and to increases in the duration, and the maximum intensity with a duration of 1.0 ms and a charging voltage of 100 kV was 0.66 (mu) C/kg at 1.0 m from the x-ray source. The dimensions of the focal spot had values of about 1 X 1 mm, and both the inner and outer triggering for producing pulse x-rays can be employed. The high-speed radiography was primarily performed by the multiple-shot radiography using a new computed radiography (CR) system in conjunction with the computer- display system with an operation system of Windows NT Workstation 4.0.

Paper Details

Date Published: 17 April 2001
PDF: 11 pages
Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424303
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Hidenori Ojima, Tohoku Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)
Masatoshi Matsumasa, Iwate Medical Univ. (Japan)
Haruo Obara, Tohoku Univ. (Japan)
Masayuki Zuguchi, Tohoku Univ. (Japan)
Tatsumi Usuki, Toreck Co., Ltd. (Japan)
Koetsu Sato, Toreck Co., Ltd. (Japan)
Kimio Sakamaki, Iwate Medical Univ. (Japan)
Yoshiharu Tamakawa, Iwate Medical Univ. (Japan)

Published in SPIE Proceedings Vol. 4183:
24th International Congress on High-Speed Photography and Photonics
Kazuyoshi Takayama; Tsutomo Saito; Harald Kleine; Eugene V. Timofeev, Editor(s)

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