^(22)Na放射源慢正电子束流插入装置的研制

Design and Construction of the Plugged-in ^(22)Na Based Slow Positron Beam Facility

北京慢正电子强束流是利用北京正负电子对撞机电子直线加速器电子打靶产生的高强度低能单色正电子束流．为了提高强束流的机时利用效率和节省强束流用于新建实验站的调试机时,设计了一套基于22Na放射源的慢正电子束流装置插入到强束流输运线上．22Na放射源慢正电子束流插入装置主要包括22Na放射源及慢化体、E×B能量选择器、多级静电加速管、磁场输运系统、真空系统、高压绝缘和辐射防护措施等．

The Beijing intense slow positron beam facility has restricted running time of the BEPC-LINAC designed for BES and BSRF operation, We have therefore designed and constructed the plugged-in ^22 Na based slow positron beam section in the Beijing intense slow positron beam line with which we can supply continuous slow positron beam for debugging of newly-built positron annihilation measurement systems and saving running time of the Beijing intense slow positron beam. The plugged-in ^22 Na based slow positron beam section includes positron source（^22 Na）, positron moderator, E×B slow positron energy filter, multilevel electrostatic acceleration tube, radioprotection, magnetic transport system and vacuum system, etc. The new slow positron beam line will be running on April, 2006.