Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100201-100201.doi: 10.11889/j.0253-3219.2019.hjs.42.100201


Development of U-shaped carbon foil in medical heavy ion accelerator

Fengqiong LIU,ZiWei LU(),Hongbin ZHANG,Xinjuan RONG,Ronghua LI,Haixia LI,Zhankui LI,Xiuhua WANG   

  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2019-03-21 Revised:2019-04-24 Online:2019-10-13 Published:2019-10-16
  • Contact: ZiWei LU
  • Supported by:
    National Natural Science Foundation of China(11775283)

Abstract: Background

Carbon stripping foil as a stripper is one of the important components of medical heavy ion accelerator. It is essential to develop the carbon stripping foil that meets the requirements of medical heavy ion accelerators.


This study aims to develop U-shaped carbon foil for medical heavy ion accelerator.


AC carbon arc discharge method was employed to develop the carbon stripping foil, and its properties were measured by the methods of scanning electron microscopy (SEM) and Raman characterization. The “U-shaped” target frame was used to ensure that target frame did not affect the normal operation of ions in the injected ring. The edge of target frame was designed to be as narrow as 2 mm wide, and the effective area of the carbon stripping foil was 1 600 mm2 (40 mm × 40 mm).


The thickness of the carbon stripping foil is 15 μg·cm-2, and the thickness uniformity is 97.65%. The SEM test results show that the surface of the carbon stripping film is smooth and the internal structure is compact. The Raman test results show that the G peak near 1 580 cm-1 is stronger than the D peak located near 1 300 cm-1, indicating the degree of graphitization of the film is higher, and the 2D peak near 2 700 cm-1 is weak, indicating that the number of graphite molecules is higher.


The carbon stripping foil developed in this study has a certain mechanical toughness thereby completing the automatic mold changing process of the carbon stripping foil.

Key words: Carbon stripping foil, “U-shaped” frame, Scanning electron microscopy, Raman characterization

CLC Number: 

  • TL99