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一、任务的提出 回旋加速器是用油扩散真空泵来获得高真空的(10~(-5)—10~(-6)mmHg)。为了防止油蒸气进入加速器内部,油扩散泵装有用液氮冷却的捕集器。液氮的输送是靠一根细铜管(内径ф=3mm)一头插在装有液氮的杜瓦瓶内,另一端插入冷凝捕集器内;铜桿与杜瓦瓶口之间是用橡皮密封的。瓶内的液氮受到外面传进来的热量慢慢的蒸发成为气氮,使瓶内的压力增加,液氮就经铜管喷到捕集器上,冷却捕集器后,成为气氮,由出气口排出(见图1)。这是苏联设备所采用的方法。这种方法比
First, the task proposed cyclotron oil diffusion pump is used to obtain high vacuum (10 ~ (-5) -10 ~ (-6) mmHg). To prevent oil vapor from entering the interior of the accelerator, the oil diffusion pump contains a trap that is cooled with liquid nitrogen. The liquid nitrogen is transported by a thin copper tube (diameter ф = 3mm) inserted in a Dewar flask filled with liquid nitrogen, the other end into the condensate trap; between the copper rod and Dewar is Rubber seal. The liquid nitrogen in the bottle is slowly vaporized by the heat from the outside into the nitrogen gas to increase the pressure in the bottle. The liquid nitrogen is sprayed onto the trap through the copper pipe. After the trap is cooled, the gas is nitrogen Outlet outlet (see Figure 1). This is the method used by Soviet equipment. This method than