title: First observation of a (1,0) mode frequency shift of an electron plasma at antiproton beam injection.
abstract: The frequency shift of the center-of-mass oscillation, known as the (1,0) mode, of a trapped electron plasma and, furthermore, its time evolution were observed during the cooling of an injected antiproton beam for the first time. Here, antiprotons mixed with the electrons did not follow faster electron oscillations but contributed to the modification of the effective potential. The time evolution of the plasma temperature, deduced from the frequency shift of the excited (3,0) mode, suggested that there was an abnormal energy deposition of the antiproton beam in the electron plasma before thermalization.
authors: Institute of Physics, University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan.
authors: N
authors: N
authors: Kuroda
authors: Atomic Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors: A
authors: A
authors: Mohri
authors: Institute of Physics, University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan.
authors: H A
authors: HA
authors: Torii
authors: Atomic Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors: Y
authors: Y
authors: Nagata
authors: Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan.
authors: M
authors: M
authors: Shibata