RF Surface Technology Group----Institute of Modern Physics

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RF Surface Technology Group

Brief Introduction

Research Fields

Achievements

Photos

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Brief Introduction

The RF Surface Technology Research Group devotes itself to the research of post-processing of SRF cavities and next generation SRF materials. It has 5 labs located at IMP main campus, Baiying SRF cavity lab, Lanzhou Xinqu SRF SRF cavity lab, and Huizhou SRF cavity lab. Main equipment of the Surface Group includes Physical Vapor Deposition (PVD) systems, Chemical Vapor Deposition (CVD) systems, electro-chemistry systems, low temperature plasma systems, and automatic clean room systems. Meanwhile, the group can utilize the characterization facilities in collaborators including LZU, SCU, and XJTU. Currently, there are 10 researchers and 10 graduates students in the group.

Research Fields

Main research topics include:

1. PVD

2. CVD

3. New SRF materials

4. RF Plasma Techniques

5. Plasma surface interaction

6. Surface Processing of Refractory Metal

7. Automation Techniques in the Clean Room

Achievements

Patens

1. Is used for removing surface of copper plating layer of nb the chemical plating solution and the plating method，Chun Q，Tan T et al.,(Paten No) ZL201711186414.8

2. Superconducting cavity the cavity surface chemical buffer full automatic polishing system, Inventor: You Z, He Y et al., (Paten No) CN201721383329.6

3. From a chemical cleaning superconducting niobium of the cavity of the mixing acid waste liquor extracting method for niobium, inventor: Fan L, Qin Z et al., (Paten No) CN201410269023.2

4. Stainless steel flange for vacuum sealing, inventor: Wang R, Guo H et al., (Paten No) CN201920575560.8

Publication

1. Shichun Huang, Takayuki Kubo and R. L. Geng*, Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through Tc, Phys. Rev. Accel. Beams 19,082001(2016).

2. Shichun Huang Yuan He* et al., Design and RF test of MEBT buncher cavities for C-ADS Injector II at IMP. Nuclear Instruments and Methods in Physics Research A 799 (2015) 44–49.

3. Shichun Huang, Andong Wu, Qingwei Chu et al., THE EFFECT OF HELIUM PROCESSING AND PLASMA CLEANING FOR LOW BETA HWR CAVITY, in Proceedings of SRF2019, Dresden, Germany(2019), FRCAB6.

4. Shichun Huang, Yuan He, T. Tan, Shengxue Zhang, THE DEVELOPMENT OF TE-SAMPLE HOST CAVITY AT IMP, in Proceedings of LINAC2018, Beijing, China.

5. Shichun Huang, R.L. Geng, EXPLORATION OF MULTI-FOLD SYMMETRY ELEMENT-LOADED SUPERCONDUCTING RADIO FREQUENCY STRUCTURE FOR RELIABLE ACCELERATION OF LOW & MEDIUM-BETA ION SPECIES, In Proceedings of IPAC2015, Richmond, VA, USA(2015), WEPMN024.

6. F. Pan, T. Tan, A.D. Wu et al., Investigation of Nucleation Stage in Diffusion Coating of Nb3Sn on Nb, in Proc. SRF`17, Lanzhou, China, 2017, THPB057, doi:10.18429/JACoW-SRF2017-THPB057

7. F. Pan, T. Tan, P. Xiong et al., Nb Sputtered 325 MHz QWR Cavities for CIADS, in Proc. HIAT2018, Lanzhou, China, 2019, pp. 145-147, doi:10.18429/JACoW-HIAT2018-WEPB06

8. F. Pan, T. Tan, M.Lu et al., New Progress for Nb Sputtered 325 MHz QWR Cavities in IMP,in Proc. SRF`19, Dresden, Germany, 2019, THPB057, doi:10.18429/JACoW-SRF2019-TUP075

9. A.D. Wu et al. Design study on medium beta superconducting HWR at IMP. Nuclear Science and Technology, (2016) 27:80. (SCI)

10. A.D. Wu et al. In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities. Nuclear Inst. and Methods in Physics Research A, (2018) 905: 61-67. (SCI)

11. L. Yang, A.D. Wu, L. Lu et al. Research on Plasma Discharge for Plasma Processing of a 1.3 GHz Single-cell SRF Cavity. Nuclear Physics Review, (2018) 35:3.

12. Zhiyan Zhang, Zongbiao Ye, Zhijun Wang, Fujun Gou, Bizhou Shen, Andong Wu et al. The mechanism study of mixed Ar/O2 plasma-cleaning treatment on niobium surface for work function improvement. Applied Surface Science, (2019) 475: 143-150. (SCI)

13. A.D. Wu et al. Experiment of plasma discharge on HWR cavity for in-situ surface cleaning study. Proceedings of LINAC2016, East-Lansing, MI, USA (International Conference)

14. A.D. Wu et al. Design of a medium beta half wave SC prototype cavity at IMP. Proceedings of SRF2015, Whistler, BC, Canada (International Conference)

15. A.D. Wu et al. XPS investigation on depth profiling of niobium surface composition and its work function. Proceeding of SRF2017, Lanzhou, China (International Conference)

16. A.D. Wu et al. Low temperature and low pressure plasma for the HWR superconducting cavity in-situ cleaning. Proceeding of SRF2017, Lanzhou, China (International Conference)

17. A.D. Wu et al. Vertical test results of plasma in-situ cleaning on low beta HWR cavity. Proceeding of LINAC2018, Beijing, China (International Conference)

18. A.D. Wu et al. The cryostat results of carbon contamination and plasma cleaning for the field emission on the SRF cavity. Proceeding of SRF2019, Dresden, Germany.

19. A.D. Wu et al. The destructive effects to the RF coupler by the plasma discharge. Proceeding of SRF2019, Dresden, Germany.