Cold test and cavity tuning for ion source injected IH cavity
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摘要: 离子源注入型IH加速器有望发展成为一种紧凑型低功耗离子加速器，为有效验证该加速结构的束流俘获效率，中国工程物理研究院流体物理研究所设计了一套将质子束从0.04 MeV加速到2.0 MeV的IH加速腔。目前已经完成了该腔的腔体加工，开展了高频参数冷测及腔体调谐研究。通过漂移管调谐和电感调谐，减小了腔体的频率误差和加速电压分布误差。模拟计算实测电场下腔体的束流俘获效率，由调谐前的16%提高到调谐后的34%。冷测调谐结果表明，该加速腔的各项参数达到设计值，具备进行功率测试和束流测试的条件。Abstract: Aimed to prove the capture efficiency of ion source injected Interdigital H mode (IH) cavity, a short linac is under construction in Institute of Fluid Physics, CAEP. Protons could be accelerated from 0.04 MeV to 2.4 MeV with this linac. The cavity was manufactured, cold test and cavity tuning were performed. After frequency tuning and field tuning, both frequency error and voltage distribution error were successfully decreased. Simulation results shows that capture efficiency of this cavity was increased from 16% to 34% by cavity tuning. The cavity parameters have reached the tuning objective and beam test will be carried out.
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Key words:
- ion source injected /
- IH cavity /
- cavity tuning /
- capture efficiency
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图 2 加速电压误差对俘获效率的影响
Figure 2. Relationship between voltage error and capture efficiency
图 4 测量误差示意图(微扰体长4 mm)
Figure 4. Diagram of measurement error (perturbation cylinder length is 4 mm)
图 5 电压的测量误差百分比与微扰体长度的关系
Figure 5. Relationship between voltage measurement error percentage and perturbation cylinder length
图 7 调谐前的加速电压及电压误差百分比分布
Figure 7. Voltage and voltage error percentage distribution before field tuning
图 8 漂移管调谐后的加速电压及电压误差百分比分布
Figure 8. Voltage and voltage error percentage distribution after tube tuning
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[1] Ratzinger U. Commissioning of the new GSI high current linac and HIF related RF linac aspects[J]. Nuclear Instruments and Methods in Physics Research A, 2001, 464: 636-645. doi: 10.1016/S0168-9002(01)00155-3 [2] Iwata Y, Yamada S, Murakami T, et al. Performance of a compact injector for heavy-ion medical accelerators[J]. Nuclear Instruments and Methods in Physics Research A, 2007, 572: 1007-1021. doi: 10.1016/j.nima.2007.01.012 [3] Wang Zhijun, He Yuan, Wu Wei, et al. Design optimization of the APF DTL in the SSC-linac[J]. Chinese Physics C, 2010, 34(10): 1639-1642. doi: 10.1088/1674-1137/34/10/017 [4] Lu Liang, Hattori T, Zhao Huanyu, et al. High power test of an injector linac for heavy ion cancer therapy facilities[J]. Physical Review Special Topics—Accelerators and Beams, 2015, 18: 111002. doi: 10.1103/PhysRevSTAB.18.111002 [5] Lu Liang, Hattori T, Hayashizaki N, et al. CW operationon APF-IH linac as a heavy ion implanter[J]. Nuclear Instruments and Methods in Physics Research A, 2010, 622: 485-491. doi: 10.1016/j.nima.2010.07.043 [6] Yamamoto K, Hattori T, Hayashizaki N, et al. Proof examination of alternating phase focusing[J]. Nuclear Instruments and Methods in Physics Research B, 2005, 240: 44-47. doi: 10.1016/j.nimb.2005.06.086 [7] Zhao Liangchao, Pang Jian, He Xiaozhong, et al. Design of alternating phase focusing Interdigital H-mode Drift-Tube-Linac with low injection energy[J]. Nuclear Instruments and Methods in Physics Research A, 2016, 806: 75-79. doi: 10.1016/j.nima.2015.10.007 [8] Lu Yuanrong, Ratzinger U, Schlitt B, et al. The general RF tuning for IH-DTL linear accelerators[J]. Nuclear Instruments and Methods in Physics Research A, 2007, 582: 336-344. doi: 10.1016/j.nima.2007.08.177 [9] Iwata Y, Fujimoto T, Miyahara N, et al. Model cavity of an alternating-phase-focused IH-DTL[J]. Nuclear Instruments and Methods in Physics Research A, 2006, 566: 256-263. doi: 10.1016/j.nima.2006.07.029 [10] 傅世年. RFQ加速器高频测量软件和分析软件开发[J]. 高能物理与核物理, 2002, 26(7): 735-741. https://www.cnki.com.cn/Article/CJFDTOTAL-KNWL200207013.htmFu Shinian. Software development for the RF measurement and analysis of RFQ accelerator. High Energy Physics and Nuclear Physics, 2002, 26(7): 735-741 https://www.cnki.com.cn/Article/CJFDTOTAL-KNWL200207013.htm [11] 刘华昌, 李阿红, 彭军, 等. 漂移管直线加速器加速电场分布及稳定性调谐研究[J]. 原子能科学技术, 2017, 51(10): 1874-1879. https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS201710023.htmLiu Huachang, Li Ahong, Peng Jun, et al. Design study on accelerating field distribution and stability tuning of drift tube linac. Atomic Energy Science and Technology, 2017, 51(10): 1874-1879 https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS201710023.htm -
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