Proton-Beam Transport through Wall-Confined Plasma Channel in the Nagaoka ETIGO-I

Transport of an intense pulsed proton beam has been studied experimentally through a wall-confined plasma channel (1-m long) in the Nagaoka ETIGO-I. A proton beam with an energy of 800-keV is injected into the channel. The transport efficiency increases with increasing channel current or decreasing channel pressure, being in good agreement with the existing theories. Changing the timing between channel current and beam injection, we have found that there exists a good timing for the beam injection. In some cases, the beam ceases to be transported probably due to some plasma instabilities.