Development of the slow positron beam system as a commercial prototype

In this paper, the slow positron beam system which is developed in IHI(Ishikawajima‐Harima Heavy Industries Co., Ltd.) for measuring S‐parameter will be introduced. This system has magnetic coils and the ExB energy filter. The positron source is ²²Na, and the activity is 3GBq at the maximum. The accelerating voltage is 50kV at the maximum. The radiation shield is composed of lead tightly covered by the stainless steel container around the vacuum chamber. And this container can be easily moved by external pressurized slider gas bearings.