Spot size measurement of a flash-radiography source using the pinhole imaging method

• Published in: Chinese physics C Vol. 40; no. 7; pp. 124 - 128
• Main Author: 王毅 李勤 陈楠 程晋明 谢宇彤 刘云龙 龙全红
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2016
• Subjects: linear induction accelerator; pinhole; spot size; X-ray source; 光斑尺寸; 光源; 实验测量; 成像法; 直线感应加速器; 调制传递函数; 针孔; 闪光照相
• ISSN: 1674-1137; 0254-3052
• DOI: 10.1088/1674-1137/40/7/076202

The spot size of the X-ray source is a key parameter of a flash-radiography facility, and is usually quoted as an evaluation of the resolving power. The pinhole imaging technique is applied to measure the spot size of the Dragon-I linear induction accelerator, by which a two-dimensional spatial distribution of the source spot is obtained. Experimental measurements are performed to measure the spot image when the transportation and focusing of the electron beam are tuned by adjusting the currents of solenoids in the downstream section. The spot size of full-width at half maximum and that defined from the spatial frequency at half peak value of the modulation transfer function are calculated and discussed.