NUCLEAR TECHNIQUES, Volume. 47, Issue 10, 100204(2024)
Design of bunch length and charge monitor based on cavity resonator for injector of Super Tau-Charm Facility
Figures & Tables(17)
Fig. 1. Electromagnetic field diagram of monopole mode and dipole mode
Fig. 3. Schematic diagram of the overall structure of the double cavity (a) 3D view, (b) Sectional view, (c) Side view
Fig. 4. Cavity field shape and choosing probe insert position (a) Cavity 1, (b) Cavity 2
Fig. 5. Resonant frequency varies with the cavity radius (a) Cavity 1, (b) Cavity 2
Fig. 6. Output signals of cavity 1 (a) Time domain, (b) Frequency domain
Fig. 7. Output signals of cavity 2 (a) Time domain, (b) Frequency domain
Table 1. Beam parameters of STCF
View tableView in ArticleTable 1. Beam parameters of STCF
参数 Parameter 值Value 束团能量 Bunch energy / GeV 1.0 ~3.5 单脉冲长度 Bunch length / ps 3.3 正电子束团电荷量 Positron bunch charge / nC 1.5 单脉冲重复频率 Bunch Reptition rate / Hz 50
Table 2. Parameters of resonant cavity
View tableView in ArticleTable 2. Parameters of resonant cavity
参数 Parameter 值Value / mm 77.73 / mm 66.53 / mm 37.00 / mm 29.42 / mm 2.0 / mm 2.0 / mm 10.0 / mm 10.0 / GHz 1.5 / GHz 6.5
Table 3. Results of Q values
View tableView in ArticleTable 3. Results of Q values
品质因数Q values TM010 TM030 Q0 717.9 1 517.8 QL 687.4 940.8 Qext 16 168.8 2 474.8
Table 4. Simulation error of bunch length
View tableView in ArticleTable 4. Simulation error of bunch length
束团长度Bunch length / ps TM010频谱幅度VTM010 / 10-8 TM030频谱幅度VTM030 / 10-8 频谱幅度比值VTM010 /VTM030 束团长度测量值Measured bunch length / ps 相对误差Relative error / % 1.0 2.387 5 4.764 6 0.501 1 1.032 3.203 2.0 2.387 2 4.752 9 0.502 3 2.005 0.264 3.0 2.386 6 4.733 2 0.504 2 2.997 0.105 4.0 2.385 9 4.705 8 0.507 0 3.995 0.136 5.0 2.384 9 4.670 8 0.510 6 4.995 0.105 6.0 2.383 7 4.628 2 0.515 0 5.996 0.066 7.0 2.382 3 4.578 3 0.520 3 6.998 0.031 8.0 2.380 7 4.521 5 0.526 5 8.000 0.001 9.0 2.378 9 4.457 9 0.533 6 9.002 0.021 10.0 2.376 9 4.387 9 0.541 7 10.004 0.041
Table 5. Simulation error of bunch charge
View tableView in ArticleTable 5. Simulation error of bunch charge
束团电荷量 TM030频谱幅度 束团电荷量测量值 相对误差 Bunch charge / nC VTM030 / 10-8 Measured bunch charge / nC Relative error / % 1.0 3.15 0.999 9 0.013 4 1.1 3.46 1.099 9 0.013 4 1.2 3.78 1.199 8 0.013 3 1.3 4.09 1.299 8 0.013 3 1.4 4.40 1.399 8 0.013 3 1.5 4.72 1.499 8 0.013 3 1.6 5.03 1.599 8 0.013 2 1.7 5.35 1.699 8 0.013 2 1.8 5.66 1.799 8 0.013 2 1.9 5.98 1.899 7 0.013 2 2.0 6.29 1.999 7 0.013 1
Table 6. Simulation measurement error of bunch length and charge brought by bunch transverse excursion
View tableView in ArticleTable 6. Simulation measurement error of bunch length and charge brought by bunch transverse excursion
束团横向偏移Transverse excursion/ mm TM010频谱幅度相对偏差ΔVTM010/VTM010 TM030频谱幅度相对偏差ΔVTM030/VTM030 束团长度测量相对误差Measured σ relative error/ % 束团电荷量测量相对误差Measured q relative error/ % 1×10-3 3.375×10-7 8.475×10-8 0.322 0.013 2 1×10-2 4.218×10-8 1.229×10-6 0.316 0.013 4 1×10-1 5.948×10-6 1.413×10-5 0.206 0.014 7 1×100 9.090×10-5 1.841×10-4 1.274 0.031 7
Table 7. Simulation measurement error of bunch length and charge brought by oblique angle of the trajectory
View tableView in ArticleTable 7. Simulation measurement error of bunch length and charge brought by oblique angle of the trajectory
束团轨迹倾斜角度Bunch trajectory angle/ mrad TM010频谱幅度相对偏差ΔVTM010/VTM010 TM030频谱幅度相对偏差ΔVTM030/VTM030 束团长度测量相对误差Measured σ relative error/ % 束团电荷量测量相对误差Measured q relative error/ % 1×10-3 6.732×10-7 2.318×10-10 0.327 0.013 2 1×10-2 7.995×10-7 7.524×10-9 0.319 0.013 2 1×10-1 1.262×10-7 1.271×10-7 0.322 0.013 3 1×100 2.987×10-6 9.323×10-7 0.311 0.013 1
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Tao LYU, Qian WANG, Qing LUO. Design of bunch length and charge monitor based on cavity resonator for injector of Super Tau-Charm Facility[J]. NUCLEAR TECHNIQUES, 2024, 47(10): 100204
Paper Information
Category: ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS
Received: Dec. 6, 2023
Accepted: --
Published Online: Dec. 13, 2024
The Author Email: WANG Qian (WANGQian), LUO Qing (LUOQing)
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