- 著者
- Mohri Akihiro Yuyama Tetsumori Tanaka Hitoshi HIGAKI Hiroyuki YAMAZAWA Yohei MICHISHITA Toshinori
- 出版者
- 社団法人応用物理学会
- 雑誌
- Japanese journal of applied physics. Pt. 1, Regular papers & short notes (ISSN:00214922)
- 巻号頁・発行日
- vol.39, no.12, pp.6726-6731, 2000-12-15
- 被引用文献数
- 1
Particles of a low current beam can be accumulated in a harmonic potential well in a high vacuum environment when they are repelled back by a local rf electric field of the frequency close to the bounce motion in the well. Here, proper damping mechanisms for the repelled particle blobs are neccessary to suppress their bounce motions. This stacking method was experimentally proved for electron beams of 1.1μA using a Multi-Ring-Electrode trap and the results were compared with numerical estimations based on a single particle model. The observed damping was much larger than the estimated one from the resistive wall effect. The stacking efficiency was nearly the same as the estimated one at the stacked number N less than 1×10^7 but it decreased with N. Experimentally obtained relationship amongst the stacked number, the incident beam energy, the rf frequency and its amplitude behaved qualitatively in the same way as the numerical results. The accumulation proceeded until the well was filled up with electrons.
- 著者
- MICHISHITA Toshinori TAKAHASHI Teruo
- 出版者
- 京都大学大学院人間・環境学研究科
- 雑誌
- 人間・環境学 = Human and Environmental Studies (ISSN:09182829)
- 巻号頁・発行日
- vol.27, pp.1-15, 2018-12-20
This paper presents a new strategy which allows us to achieve a successful Foucault pendulum with a portable and free-standing device developed. A numerical calculation for the two-dimensional Hamilton's equations predicted that the pendulum realizes the ideal Foucault performance when the time-averaged action vanishes. Experimental results strongly confirmed the numerical prediction from measurement of the action as a function of the distance between the control magnets. The device has performed the Foucault pendulum with the sufficiently accurate and reliable rotation rates corresponding to the latitudes. Independency of latitude for the optimal condition to the device was verified by the measurement of the rotation rates of the pendulum at different latitudes. Limit cycle and locking phenomena for the pendulum rotation were observed depending on the distance between the magnets. A criterion for their occurrences was examined by using the Adler equation.