Flash vacuum-ultraviolet generator having a mercury-anode tube

Michiaki Sagae; Eiichi Sato; Teiji Oizumi; Mariko Yamamoto; Akihito Takabe; Kimio Sakamaki; Hidenori Ojima; Kazuyoshi Takayama; Yoshiharu Tamakawa; Toru Yanagisawa

doi:10.1117/12.218299

1 September 1995 Flash vacuum-ultraviolet generator having a mercury-anode tube

Michiaki Sagae, Eiichi Sato, Teiji Oizumi, Mariko Yamamoto, Akihito Takabe, Kimio Sakamaki, Hidenori Ojima, Kazuyoshi Takayama, Yoshiharu Tamakawa, Toru Yanagisawa

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Proceedings Volume 2549, Ultrahigh- and High-Speed Photography, Videography, and Photonics '95; (1995) https://doi.org/10.1117/12.218299
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The fundamental studies on a flash vacuum-ultraviolet (VUV) generator for producing water- window x rays are described. this generator consisted of the following essential components: a high-voltage power supply, a polarity-inversion-type high-voltage pulser having a 15 nF condenser, a thyristor pulser as a trigger device, a turbo molecular pump, and a VUV tube. The VUV tube employed a mercury anode, and the ferrite cathode was embedded in the anode. The pressure in the tube was primarily determined by the steam pressure of mercury as a function of temperature. The condenser in the pulser was charged from -10 to -30 kV by the power supply, and the electric charges in the condenser were discharged to the radiation tube after closing a gap switch by the thyristor pulser. As the high electron flows from the cathode electrode evaporated the anode electrode, VUV rays were then produced. The maximum output voltage from the pulser was approximately -1 times the charging voltage, and both the tube voltage and current displayed damped oscillations. The maximum values of the tube voltage and current were 14 kV and 2.0 kA, respectively. Since the effective accelerating voltage was substantially decreased by the ferrite cathode, soft x rays were easily generated. The pulse durations of the VUV rays including water-window x rays were nearly equivalent to those of the damped oscillations of the voltage and current, and their values were less than 15 microsecond(s) .

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Michiaki Sagae, Eiichi Sato, Teiji Oizumi, Mariko Yamamoto, Akihito Takabe, Kimio Sakamaki, Hidenori Ojima, Kazuyoshi Takayama, Yoshiharu Tamakawa, and Toru Yanagisawa "Flash vacuum-ultraviolet generator having a mercury-anode tube", Proc. SPIE 2549, Ultrahigh- and High-Speed Photography, Videography, and Photonics '95, (1 September 1995); https://doi.org/10.1117/12.218299

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KEYWORDS

Vacuum ultraviolet

Mercury

X-rays

Electrodes

Visible radiation

Aluminum

Virtual colonoscopy

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