Optimization of the three-dimensional electric field in IH-DTL

DU Xiao-Nan; HE Yuan; YUAN You-Jin; ZHANG Sheng-Hu; WANG Zhi-Jun; XIAO Chen; XU Meng-Xin; SUN Lie-Peng

doi:10.1088/1674-1137/36/5/013

Chinese Physics C> 2012, Vol. 36> Issue(5) : 452-455 DOI: 10.1088/1674-1137/36/5/013

Optimization of the three-dimensional electric field in IH-DTL

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The tuning process of the three-dimensional electric field near the beam axis is very important in the optimization of the Interdigital H-mode Drift Tube Linac (IH-DTL). The tuning of the longitudinal field distribution, the Kilpatrik (Kp) factor, and the transverse dipole field have been discussed in detail, combined with the radio-frequency tuning process of the 53.667 MHz short IH-DTL cavity, which was designed to accelerate ²³⁸U³⁴⁺ from 0.143 MeV/u to 0.289 MeV/u in the SSC-Linac injector project at the Institute of Modern Physics. The flatness criterion and the tube tuning method are discussed in order to meet the beam dynamics requirements. In the tube tuning process, the energy gain error in the cells should be reduced to less than ±2%, and the Kp factor should be reduced to 1.6. The transverse dipole field and the method that uses a "plunger" to dismiss this dipole field are evaluated. The experience gained from the first cavity optimization benefits the tuning process of the three remaining IH-DTL cavities in the SSC-Linac project.

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DU Xiao-Nan, HE Yuan, YUAN You-Jin, ZHANG Sheng-Hu, WANG Zhi-Jun, XIAO Chen, XU Meng-Xin and SUN Lie-Peng. Optimization of the three-dimensional electric field in IH-DTL[J]. Chinese Physics C, 2012, 36(5): 452-455. doi: 10.1088/1674-1137/36/5/013

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Received: 2011-08-19
Revised: 2011-08-30

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沈阳化工大学材料科学与工程学院沈阳 110142

Optimization of the three-dimensional electric field in IH-DTL

Received Date: 2011-08-19
Accepted Date: 2011-08-30
Available Online: 2012-05-05

Abstract: The tuning process of the three-dimensional electric field near the beam axis is very important in the optimization of the Interdigital H-mode Drift Tube Linac (IH-DTL). The tuning of the longitudinal field distribution, the Kilpatrik (Kp) factor, and the transverse dipole field have been discussed in detail, combined with the radio-frequency tuning process of the 53.667 MHz short IH-DTL cavity, which was designed to accelerate ²³⁸U³⁴⁺ from 0.143 MeV/u to 0.289 MeV/u in the SSC-Linac injector project at the Institute of Modern Physics. The flatness criterion and the tube tuning method are discussed in order to meet the beam dynamics requirements. In the tube tuning process, the energy gain error in the cells should be reduced to less than ±2%, and the Kp factor should be reduced to 1.6. The transverse dipole field and the method that uses a "plunger" to dismiss this dipole field are evaluated. The experience gained from the first cavity optimization benefits the tuning process of the three remaining IH-DTL cavities in the SSC-Linac project.