Direct observation of plasma-lens effect

H. Nakanishi; Y. Yoshida; T. Ueda; T. Kozawa; H. Shibata; K. Nakajima; T. Kurihara; N. Yugami; Y. Nishida; T. Kobayashi; A. Enomoto; T. Oogoe; H. Kobayashi; B. S. Newberger; S. Tagawa; K. Miya; A. Ogata

doi:10.1103/PhysRevLett.66.1870

Direct observation of plasma-lens effect

H. Nakanishi, Y. Yoshida, T. Ueda, T. Kozawa, H. Shibata, K. Nakajima, T. Kurihara, N. Yugami, Y. Nishida, T. Kobayashi, A. Enomoto, T. Oogoe, H. Kobayashi, B. S. Newberger, S. Tagawa, K. Miya, and A. Ogata

Phys. Rev. Lett. 66, 1870 – Published 8 April 1991

Abstract

A plasma lens for 18-MeV round-shaped electron beams was experimentally studied; the lens is based on self-focusing due to shielding of the space charge of a particle beam by a quiescent plasma. A differential pumping technique was applied to separate the plasma chamber from the linac acceleration duct. It is shown that overdense plasmas successfully focus the electron beams. Another finding is that the plasmas appear to reduce the transverse emittance.

Received 9 November 1990

DOI:https://doi.org/10.1103/PhysRevLett.66.1870

Authors & Affiliations

H. Nakanishi, Y. Yoshida, T. Ueda, T. Kozawa, H. Shibata, K. Nakajima, T. Kurihara, N. Yugami, Y. Nishida, T. Kobayashi, A. Enomoto, T. Oogoe, H. Kobayashi, B. S. Newberger, S. Tagawa, K. Miya, and A. Ogata

National Laboratory for High Energy Physics, Tsukuba 305, Japan
Nuclear Engineering Research Laboratory, The University of Tokyo, Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan
Research Center for Nuclear Science Technology, The University of Tokyo, Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan
Department of Electrical Engineering, Utsunomiya University, Utsunomiya 321, Japan