Hiroshi Saeki - Experiments to trap dust particles by a wire simulating an electron beam

Version 1

      Publication Details (including relevant citation   information):

      Rev. Sci. Instrum. 62(11), 2568 - 2571 (1991).


            07.50.-e              Electrical and electronic instruments and components      


      Motion of trapped dust particles has been previously analyzed   using high‐energy bremsstrahlung data obtained during dust   trapping in the TRISTAN accumulation ring. Because it is   difficult to observe the actual motions of dust particles trapped   in an electron beam due to the strong synchrotron light   background, we carried out experiments to trap sample dust   particles with a Cu wire simulating an electron beam. A negative   potential was slowly applied to the wire using a high voltage dc   power supply. Motions of dust particles trapped by the wire were   recorded with a video camera system. In an experiment using a Cu   wire (1.5 mm in diameter) with no magnetic field, the charged   dust particle made vertical oscillation about the wire. In   another experiment using the same wire but with a vertical   magnetic field (0.135 T) simulating a bending magnetic field,   both vertical and horizontal oscillating motions perpendicular to   the wire were observed. Furthermore, it was found that the dust   particle moved in the longitudinal direction of the wire in the   bending magnetic field. Therefore, it is expected that charged   dust particles trapped by the electric field of the electron beam   oscillate vertically where there is no magnetic field in the   TRISTAN accumulation ring. It is also expected that trapped dust   particles where there is a bending magnetic field oscillate   horizontally and vertically as the particle drifts in a   longitudinal direction along the ring.

      Address (URL): http://rsi.aip.org/resource/1/rsinak/v62/i11/p2568_s1