High Power Laser and Particle Beams, Volume. 35, Issue 12, 124007(2023)
Design of 648 MHz superconducting cavity tuner forChina Spallation Neutron Source phase II
Figures & Tables(20)
Fig. 1. Variation of cavity input power demand with frequency detuning
Fig. 2. Plot of superconducting cavity Lorentz forcedetuning versus tuner stiffness
Fig. 9. Diagram of simplified piezoelectric ceramic tuning axialsimplified model
Fig. 10. Variation of acceleration gradient with time during the pulse
Fig. 13. Photo of tuner mounted test on 650 MHz single cell cavity
Fig. 14. Plot of tuner stepper motor steps versus superconducting cavity frequency variation and tuner displacement variation
Table 1. Superconducting cavity operating parameters
View tableView in ArticleTable 1. Superconducting cavity operating parameters
working frequency/MHz bandwidth of cavity/Hz operation mode pulse frequency/Hz operating gradient/(MV·m−1) 648 668 pulse 25 14 KL/(Hz·m2·MV−2) pressure sensitivity/(Hz·Pa−1) field flatness (R/Q)/Ω beam current/mA 1.5 0.15 ＞ 90% 310 40 operation temperture/K operation pressure/Pa maximum allowable working pressure/MPa cavity axial stiffness/(N·mm−1) tuning sensitivity/(kHz·mm−1) 2 3100 0.2(room temperaturer), 0.4(2 K) 2225 171
Table 2. Tuner system requirement parameters
View tableView in ArticleTable 2. Tuner system requirement parameters
tuner system stiffness/(kN·mm−1) slow tuner frequency range/kHz stepper motor resolution/Hz piezo tuner frequency range/kHz piezo tuner resolution/Hz ＞ 100 ＞ 100 10 1 4
Table 3. Mechanical properties of 648 MHz superconducting cavity
View tableView in ArticleTable 3. Mechanical properties of 648 MHz superconducting cavity
parts material axial flexibility/(mm·kN−1) axial rigidity/(kN·mm−1) cavity Nb 0.4494 2.225(Kc) front washer disk Nb55Ti 0.0339 29.52( $ {K}_{\mathrm{w}1} $ )end washer disk Nb55Ti 0.01914 52.24( $ {K}_{\mathrm{w}2} $ )helium tank Ti 0.008996 111.16( $ {K}_{\mathrm{h}} $ )tuner bellow Ti 32.327 0.031( $ {K}_{\mathrm{b}} $ )tuner 316L 0.00796 125.61( $ {K}_{\mathrm{t}} $ )interface rings Ti 0.00196 509.68( $ {K}_{\mathrm{i}} $ )piezo actuator HP 0.0125 80( $ {K}_{\mathrm{p}} $ )
Table 4. Force and displacement status of each component, when the mechanical tuner produces a displacement of
\begin{document}$ 1\;{\text{μ}}{\rm{m}} $\end{document} View tableView in ArticleTable 4. Force and displacement status of each component, when the mechanical tuner produces a displacement of
\begin{document}$ 1\;{\text{μ}}{\rm{m}} $\end{document} parts force/N displacement/ ${\text{μ}}\mathrm{m} $ piezo actuator/interface rings −2.03 −0.017 tuner bellow/end dishes −0.03 −0.980 helium tank/Front dishes −2.00 −0.086 cavity 2.00 0.898
Table 5. Force and displacement status of each component, when the piezoelectric ceramics produces a displacement of
\begin{document}$ 1\;{\text{μ}}{\rm{m}} $\end{document} View tableView in ArticleTable 5. Force and displacement status of each component, when the piezoelectric ceramics produces a displacement of
\begin{document}$ 1\;{\text{μ}}{\rm{m}} $\end{document} parts force/N displacement/ $ {\text{μ}}{\rm{m}} $ tuner/interface rings −2.02 −0.020 tuner bellow/end dishes −0.03 −0.980 helium tank/front dishes −1.99 −0.085 cavity 1.99 0.895
Table 6. Lorentz force detuning parameters before and after installing the tuner
View tableView in ArticleTable 6. Lorentz force detuning parameters before and after installing the tuner
state LFD factor/ (Hz·m2·MV−2) maximum detuning/Hz without tuner 9.32 1827 with tuner 1.48 290
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Ming Liu, Zhenghui Mi, Weimin Pan, Rui Ge, Feisi He, Wenzhong Zhou, Miaofu Xu, Zihan Wang. Design of 648 MHz superconducting cavity tuner forChina Spallation Neutron Source phase II[J]. High Power Laser and Particle Beams, 2023, 35(12): 124007
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Received: Jul. 21, 2023
Accepted: Sep. 25, 2023
Published Online: Dec. 27, 2023
The Author Email: Mi Zhenghui (mizh@ihep.ac.cn)
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