Preliminary Results on Electron Acceleration Mechanism in the Slow Theta Pinch

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概要

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• Hard X rays with maximum energies of 300 Kev were observed in the slow θ pinch. The experimental cond1tions (the same with Y. Takeda et al.) were the following: (1) The 64 μF condenser bank was operated at 40KV. (2) The helium gas without preheating was discharged by the mirror coil which consists of two multiturn coils connected parallelly. No reverse field was applied initially. The peak magnetic field at the mirrors of 25 KG was reached in 60 μ sec. The detector of hard X rays consisted of (1"φxユ") NaI (T1) crystal and 6810A photomultiplier, the output signals of which were displayed on a synchroscope. The X rays were mostly emitted from the central region of the mirror coil, so that in most experiments the detector was situated close to the center of the coil for the convenience of detection of the X rays emitted from that region. At helium pressure above 40 mTorr, X rays were emitted only during the first half cycle. The X ray yield during the first half cycle was studied as a function of helium pressure in the range 1O^<-3> Torr 800×1O^<-3> Torr. One of the results is sbown in Fig. 1. It attains a maximum in the vicinity of 80 mTorr and falls for pressures besides this value. When the pressure decreases below 40 mTorr, more intense X rays appear in the second half cycle in addition to the first half cycle, and after them, no X rays are observed until the pressure is reduced up to 1O mTorr. At 10 mTorr, X rays begin to appear at the third half cycle also. At about 2 mTorr, X rays are observed at every half cycle. The energy spectrum of X rays were determined by NaI (T1) scintillation detector which was calibrated against the 279 Kev γ rays from Hg^<203> activity. The result on the energy spectrum at 80 mTorr. is represented in Fig 2. The energy of the X rays could be roughly determined by measuring the absorption coefficient for aluminium also, the results of which was in good agreement with the value obtained by the scintillation detector within errors.

• 社団法人日本物理学会の論文
• 1964-07-05

著者

• SATO Kazuo

  Department of Obstetrics and Gynecology, Nihon University school of Medicine

• OHNISHI Haruyuki

  Department of Physics and Atomic Energy Research Institute College of Science and Engineering Nihon

• Yoshimura Hisamitsu

  Department Of Physics And Atomic Energy Research Institute College Of Science And Enineering Nihon U

• Yoshimura Hisamitsu

  Department Of Physics College Of Science And Engineering Nihon University

• Sato Kazuo

  Department Of Micro-nano System Engineering Nagoya University

• Sato Kazuo

  Department Of Mechanical Engineering Ii Shibaura Institute Of Technology

• Sato Kazuo

  Department Of Physics College Of Science And Engineering Nihon University

• Yoshimura Hisamitsu

  Department of Physics and Atomic Energy Research Institute College of Science and Engineering Nihon University, Tokyo

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