How well is the exposure area shielded from the cyclotron proper . 照射区对回旋加速器本身的屏蔽程度如何？
2.
Effective exposure area 有效曝光区域
3.
The projection optics with aspherical mirror of sub - nanometer accuracy are required to get a resolution of less than 0 . 1 m m and wide exposure area simultaneously . the precision of polishing and testing for such ashperical surface is fairly high and it has not been achieved yet in our current state Euvl微缩投影物镜为了同时实现大的曝光视场和0 . 1 m以下的成像分辨率，微缩投影光学系统需采用面形精度达亚纳米量级的非球面，但我们现阶段的光学加工和检测技术距此要求尚有一定的差距。
