Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (11): 110403-110403.doi: 10.11889/j.0253-3219.2018.hjs.41.110403

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

High precision alignment method and accuracy analysis of CSNS drift tube Linac in tunnel

MA Na1,2, KE Zhiyong1,2, HE Zhenqiang1,2, LI Bo1,2   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2 Dong Guan Neutron Science Center, Dongguan 523803, China
  • Received:2018-06-07 Revised:2018-07-20 Online:2018-11-10 Published:2018-11-20
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11605215)

Abstract: [Background] The drift tube Linac (DTL) is the end of the China Spallation Neutron Source (CSNS) Linac segment and its collimation accuracy is directly related to the final performance of the Linac. Because of its long length, large number of the cavity and drift tube, and high alignment accuracy requirement, it is extremely difficult to meet requirement.[Purpose] This study aims to explore high precision collimation method for DTL of CSNS and analyze the accuracy of drift tube pre-alignment.[Methods] Accuracy is verified by external coincidence measurement, and the pre-alignment accuracy of the center hole and the end face of the drift tube in the DTL cavity can reach 0.035 mm. The long-span, full coverage of the comprehensive measurement methods and adjustment in the CSNS application are employed to achieve high precision measurement.[Results] Experimental results showed that the relative measurement accuracy in straight tunnel was 0.03 mm and 0.04 mm in ring tunnel.[Conclusion] A smooth calculation and adjustment method based on accelerator alignment proposed in this paper can be used to obtain the cavity's relative collimator precision of 0.08 mm and the drifting tubes' relative alignment accuracy of 0.03 mm, and thus the smooth adjustment between DTL cavities can be realized.

Key words: DTL overall measurement, Smooth calculation, Relative position accuracy

CLC Number: 

  • TL53